165 KB

165 KB
**************************************************************************
USACE / NAVFAC / AFCEC / NASA
UFGS-03 30 00.00 10 (May 2014)
Change 1 - 02/15
----------------------------------Preparing Activity: USACE
Superseding
UFGS-03 31 00.00 10 (November 2010)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2016
**************************************************************************
SECTION TABLE OF CONTENTS
DIVISION 03 - CONCRETE
SECTION 03 30 00.00 10
CAST-IN-PLACE CONCRETE
05/14
PART 1
GENERAL
1.1
UNIT PRICES
1.1.1
Measurement
1.1.2
Payment
1.2
LUMP SUM CONTRACT
1.3
REFERENCES
1.4
Definitions
1.4.1
Cementitious Material
1.4.2
Chemical Admixtures
1.4.3
Complementary Cementing Materials (CCM)
1.4.4
Design Strength (f'c)
1.4.5
Mass Concrete
1.4.6
Mixture Proportioning
1.4.7
Mixture Proportions
1.4.8
Pozzolan
1.4.9
Workability or Consistency
1.5
SUBMITTALS
1.6
QUALITY ASSURANCE
1.6.1
Laboratory Accreditation
1.6.1.1
Aggregate Testing and Mix Proportioning
1.6.1.2
Acceptance Testing
1.6.1.3
Contractor Quality Control
1.6.2
Quality Control Plan
1.6.3
Pre-installation Meeting
1.6.4
Special Properties and Products
1.6.5
Technical Service for Specialized Concrete
1.6.6
Government Assurance Inspection and Testing
1.6.6.1
Materials
1.6.6.2
Fresh Concrete
1.6.6.3
Hardened Concrete
1.6.6.4
Inspection
1.7
DELIVERY, STORAGE, AND HANDLING
PART 2
PRODUCTS
SECTION 03 30 00.00 10
Page 1
2.1
SYSTEM DESCRIPTION
2.1.1
Proportioning Studies-Normal Weight Concrete
2.1.2
Proportioning Studies-Lightweight Aggregate Structural Conc
2.1.3
Average Compressive Strength
2.1.4
Computations from Test Records
2.1.5
Mix Design for Bonded Topping for Heavy Duty Floors
2.1.6
Tolerances
2.1.7
Floor Finish
2.1.8
Strength Requirements
2.1.8.1
Evaluation of Concrete Compressive Strength
2.1.8.2
Investigation of Low-Strength Compressive Test Results
2.1.8.3
Load Tests
2.1.9
Water-Cementitious Material Ratio
2.1.10
Air Entrainment
2.1.11
Slump
2.1.12
Concrete Temperature
2.1.13
Size of Coarse Aggregate
2.1.14
Lightweight Aggregate Structural Concrete
2.2
CEMENTITIOUS MATERIALS
2.2.1
Portland Cement
2.2.2
High-Early-Strength Portland Cement
2.2.3
Blended Cements
2.2.4
Fly Ash
2.2.5
Raw or Calcined Natural Pozzolan
2.2.6
Ultra Fine Fly Ash and Ultra Fine Pozzolan
2.2.7
Ground Granulated Blast-Furnace (GGBF) Slag
2.2.8
Silica Fume
2.3
AGGREGATES
2.3.1
Fine Aggregate
2.3.2
Coarse Aggregate
2.3.3
Lightweight Aggregate
2.3.4
Materials for Bonded Topping for Heavy Duty Floors
2.4
CHEMICAL ADMIXTURES
2.4.1
Air-Entraining Admixture
2.4.2
Accelerating Admixture
2.4.3
Water-Reducing or Retarding Admixture
2.4.4
High-Range Water Reducer
2.4.5
Surface Retarder
2.4.6
Expanding Admixture
2.4.7
Other Chemical Admixtures
2.5
WATER
2.6
NONSHRINK GROUT
2.7
NONSLIP SURFACING MATERIAL
2.8
EMBEDDED ITEMS
2.9
FLOOR HARDENER
2.10
PERIMETER INSULATION
2.11
VAPOR RETARDER
2.12
VAPOR BARRIER
2.13
JOINT MATERIALS
2.13.1
Joint Fillers, Sealers, and Waterstops
2.13.2
Contraction Joints in Slabs
PART 3
EXECUTION
3.1
PREPARATION FOR PLACING
3.1.1
Foundations
3.1.1.1
Concrete on Earth Foundations
3.1.1.2
Preparation of Rock
SECTION 03 30 00.00 10
Page 2
3.1.1.3
Excavated Surfaces in Lieu of Forms
3.1.2
Previously Placed Concrete
3.1.2.1
Air-Water Cutting
3.1.2.2
High-Pressure Water Jet
3.1.2.3
Wet Sandblasting
3.1.2.4
Waste Disposal
3.1.2.5
Preparation of Previously Placed Concrete
3.1.3
Vapor Retarder [and Barrier]
3.1.4
Perimeter Insulation
3.1.5
Embedded Items
3.2
CONCRETE PRODUCTION
3.2.1
General Requirements
3.2.2
Batching Plant
3.2.3
Batching Equipment
3.2.4
Scales
3.2.5
Batching Tolerances
3.2.6
Moisture Control
3.2.7
Concrete Mixers
3.2.8
Stationary Mixers
3.2.9
Truck Mixers
3.3
CONCRETE PRODUCTION, SMALL PROJECTS
3.4
LIGHTWEIGHT AGGREGATE CONCRETE
3.5
FIBER REINFORCED CONCRETE
3.6
TRANSPORTING CONCRETE TO PROJECT SITE
3.7
PLACING CONCRETE
3.7.1
Depositing Concrete
3.7.2
Consolidation
3.7.3
Cold Weather Requirements
3.7.4
Hot Weather Requirements
3.7.5
Prevention of Plastic Shrinkage Cracking
3.7.6
Placing Concrete Underwater
3.7.7
Placing Concrete in Congested Areas
3.7.8
Placing Flowable Concrete
3.8
JOINTS
3.8.1
Construction Joints
3.8.2
Contraction Joints in Slabs on Grade
3.8.3
Expansion Joints
3.8.4
Waterstops
3.8.5
Dowels and Tie Bars
3.9
SPECIALTY FLOORS
3.9.1
Heavy Duty Floors
3.9.1.1
General
3.9.1.2
Preparation of Base Slab
3.9.2
Two-Course Floor Construction
3.10
FLOOR HARDENER
3.11
EXTERIOR SLAB AND RELATED ITEMS
3.11.1
Pavements
3.11.2
Sidewalks
3.11.3
Curbs and Gutters
3.11.4
Pits and Trenches
3.12
SETTING BASE PLATES AND BEARING PLATES
3.12.1
Damp-Pack Bedding Mortar
3.12.2
Nonshrink Grout
3.12.2.1
Mixing and Placing of Nonshrink Grout
3.12.2.2
Treatment of Exposed Surfaces
3.13
TESTING AND INSPECTION FOR CQC
3.13.1
Grading and Corrective Action
3.13.1.1
Fine Aggregate
3.13.1.2
Coarse Aggregate
SECTION 03 30 00.00 10
Page 3
3.13.2
Quality of Aggregates
3.13.3
Scales, Batching and Recording
3.13.4
Batch-Plant Control
3.13.5
Concrete Mixture
3.13.5.1
Air Content Testing
3.13.5.2
Air Content Corrective Action
3.13.5.3
Slump Testing
3.13.5.4
Slump Corrective Action
3.13.5.5
Temperature
3.13.5.6
Strength Specimens
3.13.6
Inspection Before Placing
3.13.7
Placing
3.13.8
Cold-Weather Protection
3.13.9
Mixer Uniformity
3.13.9.1
Stationary Mixers
3.13.9.2
Truck Mixers
3.13.9.3
Mixer Uniformity Corrective Action
3.13.10
Reports
3.14
REPAIR, REHABILITATION AND REMOVAL
3.14.1
Crack Repair
3.14.2
Repair of Weak Surfaces
3.14.3
Failure of Quality Assurance Test Results
-- End of Section Table of Contents --
SECTION 03 30 00.00 10
Page 4
**************************************************************************
USACE / NAVFAC / AFCEC / NASA
UFGS-03 30 00.00 10 (May 2014)
Change 1 - 02/15
----------------------------------Preparing Activity: USACE
Superseding
UFGS-03 31 00.00 10 (November 2010)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2016
**************************************************************************
SECTION 03 30 00.00 10
CAST-IN-PLACE CONCRETE
05/14
**************************************************************************
NOTE: This guide specification covers the
requirements for cast-in-place concrete materials,
mixing, and placement not exposed to a marine or
high chloride environment. For concrete exposed to
a marine or high chloride environment use UFGS
03 31 29 MARINE CONCRETE.
Adhere to UFC 1-300-02 Unified Facilities Guide
Specifications (UFGS) Format Standard when editing
this guide specification or preparing new project
specification sections. Edit this guide
specification for project specific requirements by
adding, deleting, or revising text. For bracketed
items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in
respective project, whether or not brackets are
present.
Comments, suggestions and recommended changes for
this guide specification are welcome and should be
submitted as a Criteria Change Request (CCR).
**************************************************************************
PART 1
GENERAL
**************************************************************************
NOTE: This specification covers concrete work
primarily for buildings, but may also be used for
other applications such as wharves, docks, drainage
structures, warehouse type slabs, and driveways.
The following guide specifications are relative to
this section and will be included to the extent
applicable in projects where this section is used:
Section 03 11 13.00 10 STRUCTURAL CAST-IN-PLACE
CONCRETE FORMING
Section 03 20 00.00 10 CONCRETE REINFORCEMENT
SECTION 03 30 00.00 10
Page 5
1.1.1
Measurement
Measurement of concrete for payment will be made on the basis of the actual
volume within the pay lines of the structure as indicated on the contract
drawings. Measurement for payment of concrete placed against the sides of
any excavation without intervening forms will be made only within the pay
lines of the structure as shown on the contract drawings. No deductions
will be made for rounded or beveled edges, for space occupied by metal
work, for conduits, for voids, or for embedded items which are less than
0.15 cubic meters 5 cubic feet in volume or 0.09 square meters 1 square foot
in cross section.
1.1.2
Payment
Unless otherwise specified, payment for concrete will be made at the
respective unit prices per cubic meter yard for the various items of the
schedule, measured as specified above, which price includes the cost of all
labor, materials, and the use of equipment and tools required to complete
the concrete work, except for any reinforcement and embedded parts
specified to be paid separately. Unit price payment will not be made for
concrete placed in structures for which payment is made as a lump sum.
1.2
LUMP SUM CONTRACT
**************************************************************************
NOTE: Remove this paragraph when unit price
contract is required.
**************************************************************************
Under this type of contract, concrete items will be paid for by lump sum
and will not be measured. The work covered by these items consists of
furnishing all concrete materials, reinforcement, miscellaneous embedded
materials, and equipment, and performing all labor for the forming,
manufacture, transporting, placing, finishing, curing, and protection of
concrete in these structures.
1.3
REFERENCES
**************************************************************************
NOTE: This paragraph is used to list the
publications cited in the text of the guide
specification. The publications are referred to in
the text by basic designation only and listed in
this paragraph by organization, designation, date,
and title.
Use the Reference Wizard's Check Reference feature
when you add a RID outside of the Section's
Reference Article to automatically place the
reference in the Reference Article. Also use the
Reference Wizard's Check Reference feature to update
the issue dates.
References not used in the text will automatically
be deleted from this section of the project
specification when you choose to reconcile
references in the publish print process.
**************************************************************************
SECTION 03 30 00.00 10
Page 7
1.1.1
Measurement
Measurement of concrete for payment will be made on the basis of the actual
volume within the pay lines of the structure as indicated on the contract
drawings. Measurement for payment of concrete placed against the sides of
any excavation without intervening forms will be made only within the pay
lines of the structure as shown on the contract drawings. No deductions
will be made for rounded or beveled edges, for space occupied by metal
work, for conduits, for voids, or for embedded items which are less than
0.15 cubic meters 5 cubic feet in volume or 0.09 square meters 1 square foot
in cross section.
1.1.2
Payment
Unless otherwise specified, payment for concrete will be made at the
respective unit prices per cubic meter yard for the various items of the
schedule, measured as specified above, which price includes the cost of all
labor, materials, and the use of equipment and tools required to complete
the concrete work, except for any reinforcement and embedded parts
specified to be paid separately. Unit price payment will not be made for
concrete placed in structures for which payment is made as a lump sum.
1.2
LUMP SUM CONTRACT
**************************************************************************
NOTE: Remove this paragraph when unit price
contract is required.
**************************************************************************
Under this type of contract, concrete items will be paid for by lump sum
and will not be measured. The work covered by these items consists of
furnishing all concrete materials, reinforcement, miscellaneous embedded
materials, and equipment, and performing all labor for the forming,
manufacture, transporting, placing, finishing, curing, and protection of
concrete in these structures.
1.3
REFERENCES
**************************************************************************
NOTE: This paragraph is used to list the
publications cited in the text of the guide
specification. The publications are referred to in
the text by basic designation only and listed in
this paragraph by organization, designation, date,
and title.
Use the Reference Wizard's Check Reference feature
when you add a RID outside of the Section's
Reference Article to automatically place the
reference in the Reference Article. Also use the
Reference Wizard's Check Reference feature to update
the issue dates.
References not used in the text will automatically
be deleted from this section of the project
specification when you choose to reconcile
references in the publish print process.
**************************************************************************
SECTION 03 30 00.00 10
Page 7
The publications listed below form a part of this specification to the
extent referenced. The publications are referred to within the text by the
basic designation only.
AMERICAN CONCRETE INSTITUTE INTERNATIONAL (ACI)
ACI 117
(2010; Errata 2011) Specifications for
Tolerances for Concrete Construction and
Materials and Commentary
ACI 121R
(2008) Guide for Concrete Construction
Quality Systems in Conformance with ISO
9001
ACI 211.1
(1991; R 2009) Standard Practice for
Selecting Proportions for Normal,
Heavyweight and Mass Concrete
ACI 211.2
(1998; R 2004) Standard Practice for
Selecting Proportions for Structural
Lightweight Concrete
ACI 213R
(2014) Guide for Structural
Lightweight-Aggregate Concrete
ACI 214R
(2011) Evaluation of Strength Test Results
of Concrete
ACI 301
(2010; ERTA 2015) Specifications for
Structural Concrete
ACI 301M
(2010; ERTA 2015) Metric Specifications
for Structural Concrete
ACI 304.2R
(1996; R 2008) Placing Concrete by Pumping
Methods
ACI 304R
(2000; R 2009) Guide for Measuring,
Mixing, Transporting, and Placing Concrete
ACI 305.1
(2014) Specification for Hot Weather
Concreting
ACI 306.1
(1990; R 2002) Standard Specification for
Cold Weather Concreting
ACI 309R
(2005) Guide for Consolidation of Concrete
ACI 318
(2014; Errata 1-2 2014; Errata 3-4 2015)
Building Code Requirements for Structural
Concrete and Commentary
ACI 318M
(2014) Building Code Requirements for
Structural Concrete & Commentary
ACI SP-15
(2011) Field Reference Manual: Standard
Specifications for Structural Concrete ACI
301-05 with Selected ACI References
SECTION 03 30 00.00 10
Page 8
ASTM INTERNATIONAL (ASTM)
ASTM C1017/C1017M
(2013; E 2015) Standard Specification for
Chemical Admixtures for Use in Producing
Flowing Concrete
ASTM C1064/C1064M
(2011) Standard Test Method for
Temperature of Freshly Mixed
Hydraulic-Cement Concrete
ASTM C1077
(2015) Standard Practice for Laboratories
Testing Concrete and Concrete Aggregates
for Use in Construction and Criteria for
Laboratory Evaluation
ASTM C1107/C1107M
(2014a) Standard Specification for
Packaged Dry, Hydraulic-Cement Grout
(Nonshrink)
ASTM C1116/C1116M
(2010a; R 2015) Standard Specification for
Fiber-Reinforced Concrete
ASTM C1157/C1157M
(2011) Standard Specification for
Hydraulic Cement
ASTM C1240
(2014) Standard Specification for Silica
Fume Used in Cementitious Mixtures
ASTM C1260
(2014) Standard Test Method for Potential
Alkali Reactivity of Aggregates
(Mortar-Bar Method)
ASTM C131/C131M
(2014) Standard Test Method for Resistance
to Degradation of Small-Size Coarse
Aggregate by Abrasion and Impact in the
Los Angeles Machine
ASTM C136/C136M
(2014) Standard Test Method for Sieve
Analysis of Fine and Coarse Aggregates
ASTM C143/C143M
(2012) Standard Test Method for Slump of
Hydraulic-Cement Concrete
ASTM C150/C150M
(2015) Standard Specification for Portland
Cement
ASTM C1567
(2013) Standard Test Method for Potential
Alkali-Silica Reactivity of Combinations
of Cementitious Materials and Aggregate
(Accelerated Mortar-Bar Method)
ASTM C1602/C1602M
(2012) Standard Specification for Mixing
Water Used in Production of Hydraulic
Cement Concrete
ASTM C172/C172M
(2014a) Standard Practice for Sampling
Freshly Mixed Concrete
ASTM C173/C173M
(2014) Standard Test Method for Air
SECTION 03 30 00.00 10
Page 9
Content of Freshly Mixed Concrete by the
Volumetric Method
ASTM C192/C192M
(2015) Standard Practice for Making and
Curing Concrete Test Specimens in the
Laboratory
ASTM C231/C231M
(2014) Standard Test Method for Air
Content of Freshly Mixed Concrete by the
Pressure Method
ASTM C260/C260M
(2010a) Standard Specification for
Air-Entraining Admixtures for Concrete
ASTM C309
(2011) Standard Specification for Liquid
Membrane-Forming Compounds for Curing
Concrete
ASTM C31/C31M
(2012) Standard Practice for Making and
Curing Concrete Test Specimens in the Field
ASTM C311/C311M
(2013) Sampling and Testing Fly Ash or
Natural Pozzolans for Use as a Mineral
Admixture in Portland-Cement Concrete
ASTM C33/C33M
(2013) Standard Specification for Concrete
Aggregates
ASTM C330/C330M
(2014) Standard Specification for
Lightweight Aggregates for Structural
Concrete
ASTM C39/C39M
(2015a) Standard Test Method for
Compressive Strength of Cylindrical
Concrete Specimens
ASTM C42/C42M
(2013) Standard Test Method for Obtaining
and Testing Drilled Cores and Sawed Beams
of Concrete
ASTM C494/C494M
(2015a) Standard Specification for
Chemical Admixtures for Concrete
ASTM C496/C496M
(2011) Standard Test Method for Splitting
Tensile Strength of Cylindrical Concrete
Specimens
ASTM C552
(2015) Standard Specification for Cellular
Glass Thermal Insulation
ASTM C567/C567M
(2014) Determining Density of Structural
Lightweight Concrete
ASTM C578
(2015b) Standard Specification for Rigid,
Cellular Polystyrene Thermal Insulation
ASTM C591
(2015) Standard Specification for Unfaced
Preformed Rigid Cellular Polyisocyanurate
Thermal Insulation
SECTION 03 30 00.00 10
Page 10
ASTM C595/C595M
(2015; E 2015) Standard Specification for
Blended Hydraulic Cements
ASTM C618
(2012a) Standard Specification for Coal
Fly Ash and Raw or Calcined Natural
Pozzolan for Use in Concrete
ASTM C685/C685M
(2014) Concrete Made by Volumetric
Batching and Continuous Mixing
ASTM C78/C78M
(2015a) Standard Test Method for Flexural
Strength of Concrete (Using Simple Beam
with Third-Point Loading)
ASTM C937
(2010) Grout Fluidifier for
Preplaced-Aggregate Concrete
ASTM C94/C94M
(2015) Standard Specification for
Ready-Mixed Concrete
ASTM C989/C989M
(2014) Standard Specification for Slag
Cement for Use in Concrete and Mortars
ASTM D5759
(2012) Characterization of Coal Fly Ash
and Clean Coal Combustion Fly Ash for
Potential Uses
ASTM D75/D75M
(2014) Standard Practice for Sampling
Aggregates
ASTM E1643
(2011) Standard Practice for Selection,
Design, Installation, and Inspection of
Water Vapor Retarders Used in Contact with
Earth or Granular Fill Under Concrete Slabs
ASTM E1745
(2011) Standard Specification for Water
Vapor Retarders Used in Contact with Soil
or Granular Fill under Concrete Slabs
ASTM E1993/E1993M
(1998; R 2013; E 2013) Standard
Specification for Bituminous Water Vapor
Retarders Used in Contact with Soil or
Granular Fill Under Concrete Slabs
ASTM E96/E96M
(2014) Standard Test Methods for Water
Vapor Transmission of Materials
CONCRETE REINFORCING STEEL INSTITUTE (CRSI)
CRSI 10MSP
(2009; 28th Ed) Manual of Standard Practice
NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST)
NIST HB 44
(2013) Specifications, Tolerances, and
Other Technical Requirements for Weighing
and Measuring Devices
SECTION 03 30 00.00 10
Page 11
Provide direct oversight for the concrete qualification program inclusive
of associated sampling and testing. Provide all quality control reports to
the Quality Manager, Concrete Supplier and the Contracting Officer.
Maintain a copy of ACI SP-15 and CRSI 10MSP at the project site.
1.6.3
Pre-installation Meeting
**************************************************************************
NOTE: When the construction includes special items
such as very high strength concrete; non-sparking,
conductive flooring; acid-resistant concrete;
slipforming; super-flat floors, a pre-installation
meeting will be required. In which case this
paragraph will be retained with appropriate editing
and identification.
**************************************************************************
A pre-installation meeting with the Contracting Officer is required at
least 10 days prior to start of construction on [_____]. Conduct the
meeting with the Project Superintendent and active installation personnel
present.
1.6.4
Special Properties and Products
**************************************************************************
NOTE: If the use of a particular type of admixture
is required for certain parts of the structure, this
paragraph should be revised accordingly.
**************************************************************************
Concrete may contain admixtures other than air entraining agents, such as
water reducers, superplasticizers, or set retarding agents to provide
special properties to the concrete, if specified or approved. Include any
of these materials to be used on the project in the mix design studies.
1.6.5
Technical Service for Specialized Concrete
**************************************************************************
NOTE: Use this paragraph when lightweight aggregate
structural concrete is specified or for other
specialized concretes like those containing silica
fume.
**************************************************************************
Obtain the services of a factory trained technical representative to
oversee proportioning, batching, mixing, placing, consolidating, and
finishing of specialized structural concrete, such as [_____]. The
technical representative must be on the job full time until the Contracting
Officer is satisfied that field controls indicate concrete of specified
quality is furnished and that the crews are capable of continued
satisfactory work. Make the technical representative available for
consultation with and advising Government forces.
1.6.6
Government Assurance Inspection and Testing
Day-to day inspection and testing is the responsibility of the Contractor
Quality Control (CQC) staff. However, representatives of the Contracting
Officer can and will inspect construction as considered appropriate and
will monitor operations of the CQC staff. Government inspection or testing
SECTION 03 30 00.00 10
Page 16
will not relieve any CQC responsibilities.
1.6.6.1
Materials
The Government will sample and test aggregates, cementitious materials,
other materials, and concrete to determine compliance with the
specifications as considered appropriate. Provide facilities and labor as
may be necessary for procurement of representative test samples. Samples
of aggregates will be obtained at the point of batching in accordance with
ASTM D75/D75M. Other materials will be sampled from storage at the jobsite
or from other locations as considered appropriate. Samples may be placed
in storage for later testing when appropriate.
1.6.6.2
Fresh Concrete
Fresh concrete will be sampled as delivered in accordance with
ASTM C172/C172M and tested in accordance with these specifications, as
considered necessary.
1.6.6.3
Hardened Concrete
Tests on hardened concrete will be performed by the Government when such
tests are considered necessary.
1.6.6.4
Inspection
Concrete operations may be tested and inspected by the Government as the
project progresses. Failure to detect defective work or material will not
prevent rejection later when a defect is discovered nor will it obligate
the Government for final acceptance.
1.7
DELIVERY, STORAGE, AND HANDLING
Follow ACI 301 and ACI 304R requirements and recommendations. Store cement
and other cementitious materials in weathertight buildings, bins, or silos
that exclude moisture and contaminants and keep each material completely
separated. Arrange and use aggregate stockpiles in a manner to avoid
excessive segregation and to prevent contamination with other materials or
with other sizes of aggregates. Do not store aggregate directly on ground
unless a sacrificial layer is left undisturbed. Store reinforcing bars and
accessories above the ground on platforms, skids or other supports. Store
other materials in a manner to avoid contamination and deterioration.
Admixtures which have been in storage at the project site for longer than 6
months or which have been subjected to freezing cannot be used unless
retested and proven to meet the specified requirements. Materials must be
capable of being accurately identified after bundles or containers are
opened.
PART 2
PRODUCTS
**************************************************************************
NOTE: Edit this PART to include only those products
which are locally available, are required by the
project, and are acceptable to the designer.
**************************************************************************
In accordance with Section 01 33 29 SUSTAINABILITY REPORTING submit
documentation indicating: distance between manufacturing facility and the
project site, distance of raw material origin from the project site,
SECTION 03 30 00.00 10
Page 17
This required average compressive strength, f'cr, will not be a required
acceptance criteria during concrete production. However, whenever the
daily average compressive strength at 28 days drops below f'cr during
concrete production, or daily average 7-day strength drops below a strength
correlated with the 28-day f'cr, adjust the mixture, as approved, to bring
the daily average back up to f'cr. During production, the required f'cr
must be adjusted, as appropriate, based on the standard deviation being
attained on the job.
2.1.4
Computations from Test Records
Where a concrete production facility has test records, establish a standard
deviation in accordance with the applicable provisions of ACI 214R. Test
records from which a standard deviation is calculated must represent
materials, quality control procedures, and conditions similar to those
expected; must represent concrete produced to meet a specified strength or
strengths (f'c) within 7 MPa 1000 psi of that specified for proposed work;
and must consist of at least 30 consecutive tests. A strength test must be
the average of the strengths of two cylinders made from the same sample of
concrete and tested at 28[56][90] days. Required average compressive
strength f'cr used as the basis for selection of concrete proportions must
be in accordance with ACI 318 Chapter 5.
2.1.5
Mix Design for Bonded Topping for Heavy Duty Floors
The concrete mix design for bonded topping for heavy duty floors must
contain the greatest practical proportion of coarse aggregate within the
specified proportion limits. Design the mix to produce concrete having a
28-day strength of at least 34.5 MPa 5000 psi. Concrete for the topping
must consist of the following proportions, by weight:
1.00 part portland cement
1.15 to 1.25 parts fine aggregate
1.80 to 2.00 parts coarse aggregate
Maximum water-cementitious material ratio must be 0.33. The topping
concrete must not be air-entrained. The concrete must be mixed so as to
produce a mixture of the driest consistency possible to work with a sawing
motion of the strike-off and which can be floated and compacted as
specified without producing water or excess cement at the surface. In no
case must slump exceed 25 mm 1 inch as determined by ASTM C143/C143M.
2.1.6
Tolerances
**************************************************************************
NOTE: Insert any special tolerance requirements of
the project. Select the method desired for floor
finish tolerance and delete the other. Do not use
both as a Contractor's option. An effort should be
made to begin to convert to the F-system for floor
slabs. The F-system should always be used where
very flat floors are required, particularly
warehouse aisles where high-lift forklift units or
other similar stackers will operate.
**************************************************************************
Except as otherwise specified herein, tolerances for concrete batching,
mixture properties, and construction as well as definition of terms and
application practices must be in accordance with ACI 117. Take level and
SECTION 03 30 00.00 10
Page 20
grade tolerance measurements of slabs as soon as possible after finishing;
when forms or shoring are used, the measurements must be made prior to
removal.
2.1.7
Floor Finish
For floor finishes, see Section 03 35 00.00 10 CONCRETE FINISHING.
2.1.8
Strength Requirements
Specified compressive strength (f'c) must be as follows:
COMPRESSIVE STRENGTH
STRUCTURE OR PORTION OF STRUCTURE
35 MPa5000 psi at 28 days
[_____]
27.5 MPa4000 psi at 28 days
[_____]
20 MPa3000 psi at 28 days
[_____]
[_____] MPa[_____] psi at [_____] days
[_____]
**************************************************************************
NOTE: Use eight cylinders when specifying 56 or 90
day strengths. Use 150x300 6x12 cylinders for
better prediction of strength and consistency.
**************************************************************************
Concrete made with high-early strength cement must have a 7-day strength
equal to the specified 28-day strength for concrete made with Type I or II
portland cement. Compressive strength must be determined in accordance
with ASTM C39/C39M.
2.1.8.1
Evaluation of Concrete Compressive Strength
Fabricate [six] [eight] compressive strength specimens,[ 150 mm by 300 mm 6
inch by 12 inch][ 100 mm by 200 mm 4 inch by 8 inch] cylinders, laboratory
cure them in accordance with ASTM C31/C31M and test them in accordance with
ASTM C39/C39M. Test two cylinders at 7 days, two cylinders at 28 days,
[two cylinders at 56 days][two cylinders at 90 days] and hold two cylinder
in reserve. The strength of the concrete is considered satisfactory so
long as the average of all sets of three consecutive test results do not
exceed the specified compressive strength f'c by 20 percent and no
individual test result falls below the specified strength f'c by more than
3.5 MPa 500 psi), unless approved by the Contracting Officer. A "test" is
defined as the average of two companion cylinders, or if only one cylinder
is tested, the results of the single cylinder test. Additional analysis or
testing, including taking cores and/or load tests may be required when the
strength of the concrete in the structure is considered potentially
deficient.
2.1.8.2
Investigation of Low-Strength Compressive Test Results
When any strength test of standard-cured test cylinders falls below the
specified strength requirement by more than 3.5 MPa 500 psi or if tests of
field-cured cylinders indicate deficiencies in protection and curing, take
SECTION 03 30 00.00 10
Page 21
Provide direct oversight for the concrete qualification program inclusive
of associated sampling and testing. Provide all quality control reports to
the Quality Manager, Concrete Supplier and the Contracting Officer.
Maintain a copy of ACI SP-15 and CRSI 10MSP at the project site.
1.6.3
Pre-installation Meeting
**************************************************************************
NOTE: When the construction includes special items
such as very high strength concrete; non-sparking,
conductive flooring; acid-resistant concrete;
slipforming; super-flat floors, a pre-installation
meeting will be required. In which case this
paragraph will be retained with appropriate editing
and identification.
**************************************************************************
A pre-installation meeting with the Contracting Officer is required at
least 10 days prior to start of construction on [_____]. Conduct the
meeting with the Project Superintendent and active installation personnel
present.
1.6.4
Special Properties and Products
**************************************************************************
NOTE: If the use of a particular type of admixture
is required for certain parts of the structure, this
paragraph should be revised accordingly.
**************************************************************************
Concrete may contain admixtures other than air entraining agents, such as
water reducers, superplasticizers, or set retarding agents to provide
special properties to the concrete, if specified or approved. Include any
of these materials to be used on the project in the mix design studies.
1.6.5
Technical Service for Specialized Concrete
**************************************************************************
NOTE: Use this paragraph when lightweight aggregate
structural concrete is specified or for other
specialized concretes like those containing silica
fume.
**************************************************************************
Obtain the services of a factory trained technical representative to
oversee proportioning, batching, mixing, placing, consolidating, and
finishing of specialized structural concrete, such as [_____]. The
technical representative must be on the job full time until the Contracting
Officer is satisfied that field controls indicate concrete of specified
quality is furnished and that the crews are capable of continued
satisfactory work. Make the technical representative available for
consultation with and advising Government forces.
1.6.6
Government Assurance Inspection and Testing
Day-to day inspection and testing is the responsibility of the Contractor
Quality Control (CQC) staff. However, representatives of the Contracting
Officer can and will inspect construction as considered appropriate and
will monitor operations of the CQC staff. Government inspection or testing
SECTION 03 30 00.00 10
Page 16
will not relieve any CQC responsibilities.
1.6.6.1
Materials
The Government will sample and test aggregates, cementitious materials,
other materials, and concrete to determine compliance with the
specifications as considered appropriate. Provide facilities and labor as
may be necessary for procurement of representative test samples. Samples
of aggregates will be obtained at the point of batching in accordance with
ASTM D75/D75M. Other materials will be sampled from storage at the jobsite
or from other locations as considered appropriate. Samples may be placed
in storage for later testing when appropriate.
1.6.6.2
Fresh Concrete
Fresh concrete will be sampled as delivered in accordance with
ASTM C172/C172M and tested in accordance with these specifications, as
considered necessary.
1.6.6.3
Hardened Concrete
Tests on hardened concrete will be performed by the Government when such
tests are considered necessary.
1.6.6.4
Inspection
Concrete operations may be tested and inspected by the Government as the
project progresses. Failure to detect defective work or material will not
prevent rejection later when a defect is discovered nor will it obligate
the Government for final acceptance.
1.7
DELIVERY, STORAGE, AND HANDLING
Follow ACI 301 and ACI 304R requirements and recommendations. Store cement
and other cementitious materials in weathertight buildings, bins, or silos
that exclude moisture and contaminants and keep each material completely
separated. Arrange and use aggregate stockpiles in a manner to avoid
excessive segregation and to prevent contamination with other materials or
with other sizes of aggregates. Do not store aggregate directly on ground
unless a sacrificial layer is left undisturbed. Store reinforcing bars and
accessories above the ground on platforms, skids or other supports. Store
other materials in a manner to avoid contamination and deterioration.
Admixtures which have been in storage at the project site for longer than 6
months or which have been subjected to freezing cannot be used unless
retested and proven to meet the specified requirements. Materials must be
capable of being accurately identified after bundles or containers are
opened.
PART 2
PRODUCTS
**************************************************************************
NOTE: Edit this PART to include only those products
which are locally available, are required by the
project, and are acceptable to the designer.
**************************************************************************
In accordance with Section 01 33 29 SUSTAINABILITY REPORTING submit
documentation indicating: distance between manufacturing facility and the
project site, distance of raw material origin from the project site,
SECTION 03 30 00.00 10
Page 17
percentage of post-industrial and post-consumer recycled content per unit
of product and relative dollar value of recycled content products to total
dollar value of products included in project. Provide Submittals as
specified in the subject Section.
2.1
SYSTEM DESCRIPTION
**************************************************************************
NOTE: This paragraph places the responsibility for
mixture proportioning on the Contractor. Where
Government mix design is required, the entire
paragraph will be revised accordingly. Do not
delete 15 percent minimum for pozzolan, unless
pozzolan is prohibited.
**************************************************************************
Provide concrete composed of portland cement, other cementitious and
pozzolanic materials as specified, aggregates, water and admixtures as
specified.
2.1.1
Proportioning Studies-Normal Weight Concrete
Trial design batches, mixture proportions studies, and testing requirements
for various types of concrete specified are the responsibility of the
Contractor. Base mixture proportions on compressive strength as determined
by test specimens fabricated in accordance with ASTM C192/C192M and tested
in accordance with ASTM C39/C39M. Obtain mix design approval from the
Contracting Officer prior to concrete placement.
a.
Samples of all materials used in mixture proportioning studies must be
representative of those proposed for use in the project and be
accompanied by the manufacturer's or producer's test reports indicating
compliance with these specifications.
b.
Make trial mixtures having proportions, consistencies, and air content
suitable for the work based on methodology described in ACI 211.1,
using at least three different water-cementitious material ratios for
each type of mixture, which produce a range of strength encompassing
those required for each type of concrete required on the project.
c.
The maximum water-cementitious material ratios allowed in subparagraph
WATER-CEMENTITIOUS MATERIAL RATIO below will be the equivalent
water-cementitious material ratio as determined by conversion from the
weight ratio of water to cement plus pozzolan by the weight equivalency
method as described in ACI 211.1. In the case where silica fume or
GGBF slag is used, include the weight of the silica fume and GGBF slag
in the equations in ACI 211.1 for the term P, which is used to denote
the weight of pozzolan. If pozzolan is used in the concrete mixture,
the minimum pozzolan content is 15 percent by weight of the total
cementitious material, and the maximum is 35 percent.
d.
Design laboratory trial mixtures for maximum permitted slump and air
content. Make separate sets of trial mixture studies for each
combination of cementitious materials and each combination of
admixtures proposed for use. No combination of either may be used
until proven by such studies, except that, if approved in writing and
otherwise permitted by these specifications, an accelerator or a
retarder may be used without separate trial mixture study. Separate
trial mixture studies must also be made for concrete for any conveying
or placing method proposed which requires special properties and for
SECTION 03 30 00.00 10
Page 18
concrete to be placed in unusually difficult placing locations. For
previously approved concrete mix designs used within the past twelve
months, the previous mix design may be re-submitted without further
trial batch testing if accompanied by material test data conducted
within the last six months.
e.
Report the temperature of concrete in each trial batch. For each
water-cementitious material ratio, make at least three test cylinders
for each test age, cure in accordance with ASTM C192/C192M and test at
7 and 28[56,][90] days in accordance with ASTM C39/C39M. From these
test results, plot a curve showing the relationship between
water-cementitious material ratio and strength for each set of trial
mix studies. In addition, plot a curve showing the relationship
between 7 day and 28[56,][90] day strengths. Design each mixture to
promote easy and suitable concrete placement, consolidation and
finishing, and to prevent segregation and excessive bleeding.
f.
Submit the results of trial mixture design studies along with a
statement giving the maximum nominal coarse aggregate size and the
proportions of ingredients that will be used in the manufacture of each
strength of concrete, at least 60 days prior to commencing concrete
placing operations. Base aggregate weights on the saturated surface
dry condition. Accompany the statement with test results from an
approved independent commercial testing laboratory, showing that
mixture design studies have been made with materials proposed for the
project and that the proportions selected will produce concrete of the
qualities indicated. No substitutions may be made in the materials
used in the mixture design studies without additional tests to show
that the quality of the concrete is satisfactory.
2.1.2
Proportioning Studies-Lightweight Aggregate Structural Conc
Trial design batches, mixture proportioning studies, and testing
requirements must conform to the requirements specified in paragraph
PROPORTIONING STUDIES-NORMAL WEIGHT CONCRETE above, except as follows.
Trial mixtures having proportions, consistencies and air content suitable
for the work must be made based on methodology described in ACI 211.2,
using at least three different cement contents. Proportion trial mixes to
produce air dry unit weight, concrete strengths, maximum permitted slump,
and air content. Test specimens and testing must be as specified for
normal weight concrete except that [28-day compressive strength] [splitting
tensile strength in accordance with ASTM C496/C496M] must be determined
from test cylinders that have been air dried at 50 percent relative
humidity for the last 21 days. Determine air dry unit weight in accordance
with ASTM C567/C567M, designed to be at least 32 kg/cubic meter 2.0 pcf
less than the maximum specified air dry unit weight. Plot curves using
these results showing the relationship between cement factor and strength
and air dry unit weight. Normal weight fine aggregate may be substituted
for part or all of the lightweight fine aggregate, provided the concrete
meets the strength and unit weight. A correlation must also be developed
showing the ratio between air dry unit weight and fresh concrete unit
weight for each mix.
2.1.3
Average Compressive Strength
The mixture proportions selected during mixture design studies must produce
a required average compressive strength (f'cr) exceeding the specified
compressive strength (f'c) by the amount indicated below, but may not
exceed the specified strength at the same age by more than 20 percent.
SECTION 03 30 00.00 10
Page 19
concrete mixtures. Aggregate evaluations may not be
practical for projects requiring small quantities of
concrete (less than 200 cubic meters 250 cubic yards
).
Section 32 13 11 CONCRETE PAVEMENT FOR AIRFIELDS AND
OTHER HEAVY-DUTY PAVEMENTS, paragraph ALKALI-SILICA
REACTIVITY, provides a specification method for the
Contractor to evaluate and mitigate ASR in concrete
mixtures. The expansion limits specified in Section
32 13 11 are requirements for pavements and exterior
slab construction. For structural concrete
applications the measured expansion shall be less
than 0.10 percent. It may not be economical or
practical to specify different test limit
requirements for use on the same project. In which
case the lower limit required by the application
should be used.
The designer may use the specification method in
Section 32 13 11 by incorporating the relevant
paragraphs into this specification, or may use the
following requirements (included in the set of
brackets.
**************************************************************************
[Test and evaluate fine and coarse aggregates for alkali-aggregate
reactivity in accordance with ASTM C1260. Evaluate the fine and coarse
aggregates separately and in combination, which matches the proposed mix
design proportioning. All results of the separate and combination testing
must have a measured expansion less than 0.10 (0.08) percent at 16 days
after casting. Should the test data indicate an expansion of 0.10 (0.08)
percent or greater, reject the aggregate(s) or perform additional testing
using ASTM C1260 and ASTM C1567. Perform the additional testing using
ASTM C1260 and ASTM C1567 using the low alkali portland cement in
combination with ground granulated blast furnace (GGBF) slag, or Class F
fly ash. Use GGBF slag in the range of 40 to 50 percent of the total
cementitious material by mass. Use Class F fly ash in the range of 25 to
40 percent of the total cementitious material by mass.] [Provide fine and
coarse aggregates conforming to the following.]
2.3.1
Fine Aggregate
Conform to the quality and gradation requirements of ASTM C33/C33M.
2.3.2
Coarse Aggregate
Conform to ASTM C33/C33M, Class 5S, size designation [_____].
2.3.3
Lightweight Aggregate
Provide lightweight fine and coarse aggregate conforming to the quality and
gradation requirements of ASTM C330/C330M, size [_____] for coarse
aggregate. Prewet and vacuum saturate lightweight aggregate in accordance
with the Manufacturer's instructions unless otherwise specified. For
pumped concrete, prewet sufficiently to ensure that slump loss through the
pump line does not exceed 100 mm 4 inches.
SECTION 03 30 00.00 10
Page 28
2.4.3
Water-Reducing or Retarding Admixture
ASTM C494/C494M, Type A, B, or D, except that the 6-month and 1-year
compressive strength tests are waived.
2.4.4
High-Range Water Reducer
**************************************************************************
NOTE: Use this paragraph only when high-range water
reducing admixture is allowed in paragraph SLUMP in
PART 1.
**************************************************************************
ASTM C494/C494M, Type F or G, except that the 6-month and 1-year strength
requirements are waived. Use the admixture only when approved in writing,
such approval being contingent upon particular mixture control as described
in the Contractor's Quality Control Plan and upon performance of separate
mixture design studies.
2.4.5
Surface Retarder
ASTM C309. Submit sample of surface retarder material with manufacturer's
instructions for application in conjunction with air-water cutting.
2.4.6
Expanding Admixture
Aluminum powder type expanding admixture conforming to ASTM C937.
2.4.7
Other Chemical Admixtures
**************************************************************************
NOTE: Use this paragraph only when a plasticizing
admixture is allowed in paragraph SLUMP in PART 1.
**************************************************************************
Provide chemical admixtures for use in producing flowing concrete in
compliance with ASTM C1017/C1017M, Type I or II. Use these admixtures only
when approved in writing, such approval being contingent upon particular
mixture control as described in the Contractor's Quality Control Plan and
upon performance of separate mixture design studies.
2.5
WATER
Provide water complying with the requirements of ASTM C1602/C1602M.
Provide [potable] water for mixing, free of injurious amounts of oil, acid,
salt, or alkali. Submit test report showing water complies with
ASTM C1602/C1602M.
2.6
NONSHRINK GROUT
Provide nonshrink grout conforming to ASTM C1107/C1107M, and a commercial
formulation suitable for the proposed application.
2.7
NONSLIP SURFACING MATERIAL
Provide nonslip surfacing material consisting of 55 percent, minimum,
aluminum oxide or silicon-dioxide abrasive ceramically bonded together to
form a homogeneous material sufficiently porous to provide a good bond with
SECTION 03 30 00.00 10
Page 30
portland cement paste; or factory-graded emery aggregate consisting of not
less than 45 percent aluminum oxide and 25 percent ferric oxide. Use well
graded aggregate from particles retained on the 0.6 mm No. 30 sieve to
particles passing the 2.36 mm No. 8 sieve.
2.8
EMBEDDED ITEMS
Provide the size and type indicated or as
Dovetail slots must be galvanized steel.
ceilings as specified in Section 09 51 00
inserts for shelf angles and bolt hangers
wrought steel.
2.9
needed for the application.
Provide hangers for suspended
ACOUSTICAL CEILINGS. Provide
of malleable iron or cast or
FLOOR HARDENER
**************************************************************************
NOTE: Floor hardener should only be specified on
specialized indoor floors where dusting of concrete
would present an unusual problem or where specially
requested by the Using Service.
**************************************************************************
Provide a colorless aqueous solution containing zinc silicofluoride,
magnesium silicofluoride, or sodium silicofluoride. These silicofluorides
can be used individually or in combination. Proprietary hardeners may be
used if approved in writing by the Contracting Officer.
2.10
PERIMETER INSULATION
**************************************************************************
NOTE: Show required K-value on the drawings.
**************************************************************************
Polystyrene conforming to ASTM C578, Type II; polyurethane conforming to
ASTM C591, Type II; or cellular glass conforming to ASTM C552, Type I or
IV. Comply with EPA requirements in accordance with Section 01 33 29
SUSTAINABILITY REPORTING.
[2.11
VAPOR RETARDER
Polyethylene sheeting, ASTM E1745 Class [C][A][B], with a minimum thickness
of[ 0.25 mm 10 mils][ 0.38 mm 15 mils] or other equivalent material having
a vapor permeance rating not exceeding 0.04 perms as determined in
accordance with ASTM E96/E96M.
][2.12
VAPOR BARRIER
Polyethylene sheeting, ASTM E1745 Class [C][A][B], with a minimum thickness
of 0.38 mm 15 mils or ASTM E1993/E1993M bituminous membrane or other
equivalent material having a vapor permeance rating not exceeding 0.01
perms as determined in accordance with ASTM E96/E96M.
]2.13
2.13.1
JOINT MATERIALS
Joint Fillers, Sealers, and Waterstops
**************************************************************************
NOTE: Do not use bituminous filler with
non-bituminous sealer. Designer will edit bracketed
SECTION 03 30 00.00 10
Page 31
Refer to ACI 318M ACI 318, Chapter 4 for guidance on
air content.
Entrained air should not be used for concrete to be
given a smooth, dense, hard-troweled finish because
blistering and delamination may occur. Refer to ACI
302.1R for a detailed discussion on how to produce
high-quality concrete slabs-on-ground and suspended
floors for various classes of service.
**************************************************************************
Air entrain normal weight concrete based on the following table[, except as
otherwise specified for lightweight concrete].
MINIMUM AIR CONTENT Percent STRUCTURE OR PORTION OF STRUCTURE
4.5
[_____]
5.0
[_____]
6.0
[_____]
[_____]
[_____]
Attain specified air content at point of placement into the forms within
plus or minus 1.5 percent. Determine air content for normal weight
concrete in accordance with ASTM C231/C231M. [Air entrain lightweight
concrete in the [_____] parts of the structure with a total air content of
4.5 to 7.5 percent, except that if the nominal maximum size coarse
aggregate is 9.5 mm 3/8 inch or less, the air content must be 5.5 to 8.5
percent. Determine air content for lightweight concrete in accordance with
ASTM C173/C173M.]
2.1.11
Slump
**************************************************************************
NOTE: Use the sentence in the first set of brackets
when those admixtures are permitted by the
specifications. When admixtures are added on site
use the bracket statement requiring a 50 to 100 mm 2
to 4 inch slump before the admixtures are added.
Add special slump requirements for Class 8 and 9
floor slabs from ACI 302, when such floors are to be
constructed. Edit for lightweight concrete as
required.
**************************************************************************
Slump of the concrete, as delivered to the point of placement into the
forms, must be within the following limits. Determine slump in accordance
with ASTM C143/C143M.
SECTION 03 30 00.00 10
Page 23
Structural Element
Slump mm inches
Minimum
Maximum
Walls, columns and beams
50 2
100 4
Foundation walls, substructure walls, footings,
slabs
25 1
75 3
Any structural concrete approved for placement by pumping:
At pump
50 2
200 8
At discharge of line
251
1004
[When use of a plasticizing admixture conforming to ASTM C1017/C1017M or
when a Type F or G high range water reducing admixture conforming to
ASTM C494/C494M is permitted to increase the slump of concrete, concrete
must have [a slump of 50 to 100 mm 2 to 4 inches before the admixture is
added and ]a maximum slump of 200 mm 8 inches at the point of delivery
after the admixture is added.] [For troweled floors, slump of structural
lightweight concrete with normal weight sand placed by pump must not exceed
125 mm 5 inches at the point of placement. For other slabs, slump of
lightweight concrete must not exceed 100 mm 4 inches at point of placement.]
2.1.12
Concrete Temperature
The temperature of the concrete as delivered must not exceed 32 degrees C
90 degrees F. When the ambient temperature during placing is 5 degrees C
40 degrees F or less, or is expected to be at any time within 6 hours after
placing, the temperature of the concrete as delivered must be between 12
and 25 degrees C 55 and 75 degrees F.
2.1.13
Size of Coarse Aggregate
Use the largest feasible nominal maximum size aggregate (NMSA), specified
in PART 2 paragraph AGGREGATES, in each placement. However, do not exceed
nominal maximum size of aggregate for any of the following: three-fourths
of the minimum cover for reinforcing bars, three-fourths of the minimum
clear spacing between reinforcing bars, one-fifth of the narrowest
dimension between sides of forms, or one-third of the thickness of slabs or
toppings.
2.1.14
Lightweight Aggregate Structural Concrete
**************************************************************************
NOTE: Retain this paragraph when lightweight
aggregate structural concrete is required. Use
bracketed alternate strength inserts (compressive or
splitting tensile strength) as appropriate.
Correlate strength versus unit weight requirements
as determined from table in ASTM C330/C330M, and as
determined by consultation with local producers.
Remove last sentence when floor fill is not required.
**************************************************************************
SECTION 03 30 00.00 10
Page 24
Conform lightweight aggregate structural concrete to the requirements
specified for normal weight concrete except as specified herein.
[Compressive strength must be at least [_____] at 28 days,] [Splitting
tensile strength determined in accordance with ASTM C496/C496M must be at
least [_____] at 28 days,] as determined by test specimens that have been
air dried at 50 percent relative humidity for the last 21 days. Air-dry
unit weight must not be over [_____] at equilibrium as determined by
ASTM C567/C567M. However, use fresh unit weight for acceptance during
concreting, using a correlation factor between the two types of unit weight
as determined during mixture design studies. Lightweight aggregate
structural concrete floor fill must have a 28-day compressive strength of
at least 17.3 MPa 2500 psi and an air-dry unit weight not exceeding 1850
kg/cubic meter 115 pcf at equilibrium.
2.2
CEMENTITIOUS MATERIALS
**************************************************************************
NOTE: EPA recommends that procuring agencies use
flowable fill containing coal fly ash (pozzolan)
and/or ferrous foundry sands for backfill and other
fill applications. EPA further recommends that
procuring agencies include provisions in all
construction contracts involving backfill or other
fill applications, to allow for the use of flowable
fill containing coal fly ash and/or ferrous foundry
sands, where appropriate.
Include the limits on soluble alkalis for portland
cement and for pozzolan whenever there is a
possibility of alkali-aggregate reactive aggregates
being furnished.
Where alkali-bearing soil or groundwater is
encountered, or where the concrete will be exposed
to sewage, see ACI 201.2 R for guidance on selecting
cementitious material. See EM 1110-2-2000 for
guidance when proposing to use any type of
portland-pozzolan or portland-furnace-slag cement.
If high early strength concrete is required, specify
Type III after consulting the agency's Subject
Matter Expert in Concrete Materials. Low alkali
cement may be required if the proposed aggregates
are found to be expansive.
**************************************************************************
Cementitious Materials must be portland cement, [portland-pozzolan cement,]
[portland blast-furnace slag cement,] or portland cement in combination
with [pozzolan] [or ground granulated blast furnace slag] [or silica fume]
conforming to appropriate specifications listed below. Restrict usage of
cementitious materials in concrete that will have surfaces exposed in the
completed structure so there is no change in color, source, or type of
cementitious material.
2.2.1
Portland Cement
ASTM C150/C150M, Type [I] [II] [III] [low alkali] [including false set
requirements] with a maximum 10 percent amount of tricalcium aluminate, and
a maximum cement-alkali content of 0.80 percent Na2Oe (sodium oxide)
SECTION 03 30 00.00 10
Page 25
equivalent. White portland cement must meet the above requirements except
that it may be Type I, Type II[ or Type III] [low alkali]. [Use white Type
III only in specific areas of the structure, when approved in writing.]
[2.2.2
High-Early-Strength Portland Cement
ASTM C150/C150M, Type III with tricalcium aluminate limited to [5] [8]
percent, [low alkali]. Use Type III cement only in isolated instances and
only when approved in writing.
]2.2.3
Blended Cements
**************************************************************************
NOTE: Never specify I(PM) or I(SM) cement.
**************************************************************************
Conform blended cement to ASTM C595/C595M and ASTM C1157/C1157M, Type IP or
IS, including the optional requirement for mortar expansion [and sulfate
soundness] and consist of a mixture of ASTM C150/C150M Type I, or Type II
cement and a complementary cementing material. The slag added to the Type
IS blend must be ASTM C989/C989M ground granulated blast-furnace slag. The
pozzolan added to the Type IP blend must be ASTM C618 Class F and must be
interground with the cement clinker. Provide a manufacturer's statement
that the amount of pozzolan in the finished cement will not vary more than
plus or minus 5 mass percent of the finished cement from lot-to-lot or
within a lot. Do not change the percentage and type of mineral admixture
used in the blend from that submitted for the aggregate evaluation and
mixture proportioning.
2.2.4
Fly Ash
Conform fly ash to ASTM C618, Class F,except that the maximum allowable
loss on ignition cannot exceed [3][6] percent. If pozzolan is used, it
must never be less than [15][20][30][35][40][_____] percent by weight of
the total cementitious material. Report the chemical analysis of the fly
ash in accordance with ASTM C311/C311M. Evaluate and classify fly ash in
accordance with ASTM D5759. Comply with EPA requirements in accordance
with Section 01 33 29 SUSTAINABILITY REPORTING.
2.2.5
Raw or Calcined Natural Pozzolan
Natural pozzolan must be raw or calcined and conform to ASTM C618, Class N,
including the optional requirements for uniformity and effectiveness in
controlling Alkali-Silica reaction and must have an on ignition loss not
exceeding 3 percent. Class N pozzolan for use in mitigating Alkali-Silica
Reactivity must have a Calcium Oxide (CaO) content of less than 13 percent
and total equivalent alkali content less than 3 percent.
2.2.6
Ultra Fine Fly Ash and Ultra Fine Pozzolan
Conform Ultra Fine Fly Ash (UFFA) and Ultra Fine Pozzolan (UFP) ASTM C618,
Class F or N, and the following additional requirements:
a.
The strength activity index at 28 days of age is at least 95 percent of
the control specimens.
b.
The average particle size does not exceed 6 microns.
c.
The sum of SiO2 + Al2O3 + Fe2O3 is greater than 77 percent.
SECTION 03 30 00.00 10
Page 26
2.2.7
Ground Granulated Blast-Furnace (GGBF) Slag
ASTM C989/C989M, Grade [100][120]. Slag content must be a minimum of
[25][50][70] percent by weight of cementitious material. Submit test
results in accordance with ASTM C989/C989M for
GGBF slag. Submit test results performed within 6 months of submittal
date..
2.2.8
Silica Fume
**************************************************************************
NOTE: Silica Fume may only be used for OCONUS
projects where Class F fly ash and GGBF slag are not
available, after approval by the Contracting
Officer. Guidance for use of silica fume should be
sought from the agency's Subject Matter Expert in
Concrete Materials.
Supervision by manufacturer's representative should
be required during batching, finishing, and curing
at start-up of the job. A HRWR recommended by the
manufacturer of the silica fume should be used.
**************************************************************************
Conform silica fume to ASTM C1240. Conform available alkalis to the
optimal limit given in Table 2 of ASTM C1240. Silica fume may be furnished
as a dry, densified material or as a slurry. Proper mixing is essential to
accomplish proper distribution of the silica fume and avoid agglomerated
silica fume which can react with the alkali in the cement resulting in
premature and extensive concrete damage. In accordance with paragraph
Technical Service for Specialized Concrete in PART 1, provide the services
of a manufacturer's technical representative experienced in mixing,
proportioning, placement procedures, and curing of concrete containing
silica fume. This representative must be present on the project prior to
and during at least the first 4 days of concrete production and placement
using silica fume. Use a High Range Water Reducer (HRWR) with silica fume.
2.3
AGGREGATES
**************************************************************************
NOTE: Edit and fill in the blanks as appropriate.
Consideration should always be given to the local
aggregate supply situation, quality, and
availability.
This note may be disregarded for regions where
Alkali-Silica Reactivity (ASR) is not a concern.
Some aggregate sources may exhibit an ASR
potential. ASR is a potentially deleterious
reaction between alkalis present in concrete and
some siliceous aggregates, reference EM 1110-2-2000
paragraph 2-3b(6) and appendix D. Where ASR is
known or suspected to pose a concern for concrete
durability, it is recommended that aggregates
proposed for use in concrete be evaluated to
determine ASR potential and an effective
mitigation. EM 1110-2-2000, provides
recommendations for evaluating and mitigating ASR in
SECTION 03 30 00.00 10
Page 27
concrete mixtures. Aggregate evaluations may not be
practical for projects requiring small quantities of
concrete (less than 200 cubic meters 250 cubic yards
).
Section 32 13 11 CONCRETE PAVEMENT FOR AIRFIELDS AND
OTHER HEAVY-DUTY PAVEMENTS, paragraph ALKALI-SILICA
REACTIVITY, provides a specification method for the
Contractor to evaluate and mitigate ASR in concrete
mixtures. The expansion limits specified in Section
32 13 11 are requirements for pavements and exterior
slab construction. For structural concrete
applications the measured expansion shall be less
than 0.10 percent. It may not be economical or
practical to specify different test limit
requirements for use on the same project. In which
case the lower limit required by the application
should be used.
The designer may use the specification method in
Section 32 13 11 by incorporating the relevant
paragraphs into this specification, or may use the
following requirements (included in the set of
brackets.
**************************************************************************
[Test and evaluate fine and coarse aggregates for alkali-aggregate
reactivity in accordance with ASTM C1260. Evaluate the fine and coarse
aggregates separately and in combination, which matches the proposed mix
design proportioning. All results of the separate and combination testing
must have a measured expansion less than 0.10 (0.08) percent at 16 days
after casting. Should the test data indicate an expansion of 0.10 (0.08)
percent or greater, reject the aggregate(s) or perform additional testing
using ASTM C1260 and ASTM C1567. Perform the additional testing using
ASTM C1260 and ASTM C1567 using the low alkali portland cement in
combination with ground granulated blast furnace (GGBF) slag, or Class F
fly ash. Use GGBF slag in the range of 40 to 50 percent of the total
cementitious material by mass. Use Class F fly ash in the range of 25 to
40 percent of the total cementitious material by mass.] [Provide fine and
coarse aggregates conforming to the following.]
2.3.1
Fine Aggregate
Conform to the quality and gradation requirements of ASTM C33/C33M.
2.3.2
Coarse Aggregate
Conform to ASTM C33/C33M, Class 5S, size designation [_____].
2.3.3
Lightweight Aggregate
Provide lightweight fine and coarse aggregate conforming to the quality and
gradation requirements of ASTM C330/C330M, size [_____] for coarse
aggregate. Prewet and vacuum saturate lightweight aggregate in accordance
with the Manufacturer's instructions unless otherwise specified. For
pumped concrete, prewet sufficiently to ensure that slump loss through the
pump line does not exceed 100 mm 4 inches.
SECTION 03 30 00.00 10
Page 28
Perform cold weather concreting in accordance with ACI 306.1. Use special
protection measures, approved by the Contracting Officer, if freezing
temperatures are anticipated before the expiration of the specified curing
period. The ambient temperature of the air where concrete is to be placed
and the temperature of surfaces to receive concrete must be not less than 5
degrees C 40 degrees F. The temperature of the concrete when placed must
be not less than 10 degrees C 50 degrees F nor more than 25 degrees C 75
degrees F. Heat the mixing water or aggregates to regulate the concrete
placing temperature. Materials entering the mixer must be free from ice,
snow, or frozen lumps. Do not incorporate salt, chemicals or other
materials in the concrete to prevent freezing. Upon written approval, an
accelerating admixture conforming to ASTM C494/C494M, Type C or E may be
used, provided it contains no calcium chloride. Do not use calcium
chloride.
3.7.4
Hot Weather Requirements
**************************************************************************
NOTE: If desired, placement of floor slabs may be
specified to be delayed until a roof is in place.
Additional information concerning hot weather
concreting may be obtained from ACI 305R.
**************************************************************************
When job-site conditions are present or anticipated that accelerate the
rate of moisture loss or rate of cement hydration of freshly mixed
concrete, including an ambient temperature of 27 degrees C 80 degrees F or
higher, and an evaporation rate that exceeds 1 kg/m 2/h 0.2 lb/ft2/h,
conform concrete work to all requirements of ACI 305.1.
3.7.5
Prevention of Plastic Shrinkage Cracking
During hot weather with low humidity, and particularly with appreciable
wind, as well as interior placements when space heaters produce low
humidity, be alert to the tendency for plastic shrinkage cracks to develop
and institute measures to prevent this. Take particular care if plastic
shrinkage cracking is potentially imminent and especially if it has
developed during a previous placement. Conform with the requirement of
ACI 305.1. In addition further protect the concrete placement by erecting
shades and windbreaks and by applying fog sprays of water, sprinkling,
ponding or wet covering. Fill plastic shrinkage cracks that occur by
injection of epoxy resin as directed, after the concrete hardens. Never
trowel over plastic shrinkage cracks or fill with slurry.
[3.7.6
Placing Concrete Underwater
**************************************************************************
NOTE: Delete this paragraph when not applicable.
If major underwater concrete placement is required,
use specification 03 31 29 MARINE CONCRETE.
Contractor will be required to submit proposed
procedures.
**************************************************************************
Deposit concrete in water by a tremie or concrete pump. The methods and
equipment used are subject to approval. Do not use concrete buckets for
underwater placement of concrete except to deliver concrete to the tremie.
The tremie must be watertight and large enough to permit a free flow of
SECTION 03 30 00.00 10
Page 41
concrete. Deposit the concrete so that it enters the mass of the
previously placed concrete from within, displacing water with a minimum
disturbance to the surface of the concrete. Keep the discharge end of the
pump line or tremie shaft continuously submerged in the concrete. The
underwater seal at start of placing must not produce undue turbulence in
the water. Keep the tremie shaft full of concrete to a point well above
the water surface. Placement proceeds without interruption until the
concrete has been brought to the required height. Do not move the tremie
horizontally during a placing operation, and provide a sufficient number of
tremies so that the maximum horizontal flow of concrete is limited to 5 m
15 feet. Do not deposit concrete in running water or in water with a
temperature below 2 degrees C 35 degrees F.
]3.7.7
Placing Concrete in Congested Areas
**************************************************************************
NOTE: Delete the last sentence when not applicable.
**************************************************************************
Use special care to ensure complete filling of the forms, elimination of
all voids, and complete consolidation of the concrete when placing concrete
in areas congested with reinforcing bars, embedded items, waterstops and
other tight spacing. Use an appropriate concrete mixture, with the nominal
maximum size of aggregate (NMSA) meeting the specified criteria when
evaluated for the congested area. Use vibrators with heads of a size
appropriate for the clearances available, and closely supervise the
consolidation operation to ensure complete and thorough consolidation at
all points. Where necessary, alternate splices of reinforcing bars to
reduce congestion. Where two mats of closely spaced reinforcing are
required, place the bars in each mat in matching alignment to reduce
congestion. Reinforcing bars may be temporarily crowded to one side during
concrete placement provided they are returned to exact required location
before concrete placement and consolidation are completed.
3.7.8
Placing Flowable Concrete
**************************************************************************
NOTE: Delete this paragraph when flowable concrete
is not permitted.
**************************************************************************
If a plasticizing admixture conforming to ASTM C1017/C1017M is used or if a
Type F or G high range water reducing admixture is permitted to increase
the slump, the concrete must meet all requirements of paragraph SYSTEM
DESCRIPTION. Use extreme care in conveying and placing the concrete to
avoid segregation. No relaxation of requirements to accommodate flowable
concrete will be permitted.
3.8
JOINTS
**************************************************************************
NOTE: All joints should be indicated on the
drawings. When some of the joints are not shown,
the Designer must edit this paragraph for
conformance with job requirements.
**************************************************************************
Locate and construct joints as indicated or approved. Locate and construct
joints not indicated to minimize the impact on the strength of the
SECTION 03 30 00.00 10
Page 42
portland cement paste; or factory-graded emery aggregate consisting of not
less than 45 percent aluminum oxide and 25 percent ferric oxide. Use well
graded aggregate from particles retained on the 0.6 mm No. 30 sieve to
particles passing the 2.36 mm No. 8 sieve.
2.8
EMBEDDED ITEMS
Provide the size and type indicated or as
Dovetail slots must be galvanized steel.
ceilings as specified in Section 09 51 00
inserts for shelf angles and bolt hangers
wrought steel.
2.9
needed for the application.
Provide hangers for suspended
ACOUSTICAL CEILINGS. Provide
of malleable iron or cast or
FLOOR HARDENER
**************************************************************************
NOTE: Floor hardener should only be specified on
specialized indoor floors where dusting of concrete
would present an unusual problem or where specially
requested by the Using Service.
**************************************************************************
Provide a colorless aqueous solution containing zinc silicofluoride,
magnesium silicofluoride, or sodium silicofluoride. These silicofluorides
can be used individually or in combination. Proprietary hardeners may be
used if approved in writing by the Contracting Officer.
2.10
PERIMETER INSULATION
**************************************************************************
NOTE: Show required K-value on the drawings.
**************************************************************************
Polystyrene conforming to ASTM C578, Type II; polyurethane conforming to
ASTM C591, Type II; or cellular glass conforming to ASTM C552, Type I or
IV. Comply with EPA requirements in accordance with Section 01 33 29
SUSTAINABILITY REPORTING.
[2.11
VAPOR RETARDER
Polyethylene sheeting, ASTM E1745 Class [C][A][B], with a minimum thickness
of[ 0.25 mm 10 mils][ 0.38 mm 15 mils] or other equivalent material having
a vapor permeance rating not exceeding 0.04 perms as determined in
accordance with ASTM E96/E96M.
][2.12
VAPOR BARRIER
Polyethylene sheeting, ASTM E1745 Class [C][A][B], with a minimum thickness
of 0.38 mm 15 mils or ASTM E1993/E1993M bituminous membrane or other
equivalent material having a vapor permeance rating not exceeding 0.01
perms as determined in accordance with ASTM E96/E96M.
]2.13
2.13.1
JOINT MATERIALS
Joint Fillers, Sealers, and Waterstops
**************************************************************************
NOTE: Do not use bituminous filler with
non-bituminous sealer. Designer will edit bracketed
SECTION 03 30 00.00 10
Page 31
items for joint sealing.
**************************************************************************
Provide materials for expansion joint fillers and waterstops in accordance
with Section 03 15 00.00 10 CONCRETE ACCESSORIES. Provide materials for
and sealing of joints conforming to the requirements of Section [07 92 00
JOINT SEALANTS] [32 01 19 FIELD MOLDED SEALANTS FOR SEALING JOINTS IN RIGID
PAVEMENTS] [32 13 73 COMPRESSION JOINT SEALS FOR CONCRETE PAVEMENTS].
2.13.2
Contraction Joints in Slabs
Provide materials for contraction joint inserts in accordance with Section
03 15 00.00 10 CONCRETE ACCESSORIES.
PART 3
3.1
EXECUTION
PREPARATION FOR PLACING
Before commencing concrete placement, perform the following: Clean
surfaces to receive concrete, free from frost, ice, mud, and water. Place,
clean, coat, and support forms in accordance with Section 03 11 13.00 10
STRUCTURAL CONCRETE FORMWORK. Place, clean, tie, and support reinforcing
steel in accordance with Section 03 20 00.00 10 CONCRETE REINFORCEMENT.
Transporting and conveying equipment is in-place, ready for use, clean, and
free of hardened concrete and foreign material. Equipment for
consolidating concrete is at the placing site and in proper working order.
Equipment and material for curing and for protecting concrete from weather
or mechanical damage is at the placing site, in proper working condition
and in sufficient amount for the entire placement. When hot, windy
conditions during concreting appear probable, equipment and material is at
the placing site to provide windbreaks, shading, fogging, or other action
to prevent plastic shrinkage cracking or other damaging drying of the
concrete as required in Section 03 39 00.00 10 CONCRETE CURING.
3.1.1
3.1.1.1
Foundations
Concrete on Earth Foundations
Earth (subgrade, base, or subbase courses) surfaces upon which concrete is
to be placed is clean, damp, and free from debris, frost, ice, and standing
or running water. Prior to placement of concrete, the foundation must be
well drained, satisfactorily graded and uniformly compacted.
3.1.1.2
Preparation of Rock
Rock surfaces upon which concrete is to be placed is free from oil,
standing or running water, ice, mud, drummy rock, coating, debris, and
loose, semidetached or unsound fragments. Clean joints in rock to a
satisfactory depth, as determined by the Contracting Officer, and to firm
rock on the sides. Immediately before the concrete is placed, thoroughly
clean rock surfaces by the use of air-water jets or sandblasting as
specified below for Previously Placed Concrete. Keep rock surfaces
continuously moist for at least 24 hours immediately prior to placing
concrete thereon. Cover all horizontal and approximately horizontal
surfaces, immediately before the concrete is placed, with a layer of mortar
proportioned similar to that in the concrete mixture. Place concrete
before the mortar stiffens.
SECTION 03 30 00.00 10
Page 32
3.1.1.3
Excavated Surfaces in Lieu of Forms
**************************************************************************
NOTE: Delete this paragraph when forms are required.
**************************************************************************
Concrete for [footings] [and] [walls] may be placed directly against the
soil provided the earth or rock has been carefully trimmed, is uniform and
stable, and meets the compaction requirements of Section 31 00 00
EARTHWORK. Place the concrete without becoming contaminated by loose
material, and outlined within the specified tolerances.
3.1.2
Previously Placed Concrete
**************************************************************************
NOTE: If structure has few construction joints to
be bonded, none of them critical, remove the
following requirements except for subparagraph
Preparation of Previously Placed Concrete.
Otherwise, use the following requirements and remove
subparagraph Preparation of Previously Placed
Concrete.
**************************************************************************
Prepare concrete surfaces to which additional concrete is to be bonded for
receiving the next horizontal lift by cleaning the construction joint
surface with either air-water cutting, sandblasting, high-pressure water
jet, or other approved method. Prepare concrete at the side of vertical
construction joints as approved by the Contracting Officer. Do not use
air-water cutting on formed surfaces or surfaces congested with reinforcing
steel. Regardless of the method used, the resulting surfaces must be free
from all laitance and inferior concrete so that clean surfaces of well
bonded coarse aggregate are exposed and make up at least 10-percent of the
surface area, distributed uniformly throughout the surface. Do not
undercut the edges of the coarse aggregate. Keep the surface of horizontal
construction joints continuously wet for the first 12 hours during the
24-hour period prior to placing fresh concrete. Wash the surface
completely clean as the last operation prior to placing the next lift. For
heavy duty floors and two-course floors, thoroughly scrub a thin coat of
neat cement grout of about the consistency of thick cream into the existing
surface immediately ahead of the topping placing. The grout must be a 1:1
mixture of portland cement and sand passing the 2.36 mm No. 8 sieve.
Deposit the topping concrete before the grout coat has had time to stiffen.
3.1.2.1
Air-Water Cutting
Perform air-water cutting of a fresh concrete surface at the proper time
and only on horizontal construction joints. The air pressure used in the
jet mustl be 700 kPa 100 psi, plus or minus 70 kPa 10 psi, and the water
pressure must be just sufficient to bring the water into effective
influence of the air pressure. When approved by the Contracting Officer, a
surface retarder complying with the requirements of ASTM C309 may be
applied to the surface of the lift in order to prolong the period of time
during which air-water cutting is effective. After cutting, wash and rinse
the surface as long as there is any trace of cloudiness of the wash water.
Where necessary to remove accumulated laitance, coatings, stains, debris,
and other foreign material, use high-pressure waterjet or sandblasting as
the last operation before placing the next lift.
SECTION 03 30 00.00 10
Page 33
3.1.2.2
High-Pressure Water Jet
Use a stream of water under a pressure of not less than 20 MPa 3,000 psi
for cutting and cleaning. Delay its use until the concrete is sufficiently
hard so that only the surface skin or mortar is removed and there is no
undercutting of coarse-aggregate particles. If the waterjet is incapable
of a satisfactory cleaning, clean the surface by sandblasting.
3.1.2.3
Wet Sandblasting
Use wet sandblasting after the concrete has reached sufficient strength to
prevent undercutting of the coarse aggregate particles. After wet
sandblasting, thoroughly wash the surface of the concrete to remove all
loose materials.
3.1.2.4
Waste Disposal
Dispose of waste water employed in cutting, washing, and rinsing of
concrete surfaces in a manner that the waste water does not stain,
discolor, or affect exposed surfaces of the structures, or damage the
environment of the project area. The method of disposal is subject to
approval.
3.1.2.5
Preparation of Previously Placed Concrete
**************************************************************************
NOTE: When the structure has few construction
joints to be bonded, none of them critical, use this
subparagraph and delete requirements of above
subparagraphs and of paragraph Previously Placed
Concrete. Renumber this specification accordingly.
**************************************************************************
Abrade concrete surfaces to which other concrete is to be bonded in an
approved manner that exposes sound aggregate uniformly without damaging the
concrete. Remove laitance and loose particles. Thoroughly wash surfaces,
leaving them moist but without free water when concrete is placed.
3.1.3
Vapor Retarder [and Barrier]
**************************************************************************
NOTE: When this paragraph is used, coordinate
drawings and specifications ensuring that drawings
indicate vapor retarder beneath slabs. Locate vapor
retarder below the slab-on-grade per ACI 360R,
figure 4.7. Retain the penultimate sentence unless
experience in the area has shown it to be
unnecessary.
**************************************************************************
Provide vapor retarder beneath the interior on-grade concrete floor slabs
installed in accordance with ASTM E1643. Use the greatest widths and
lengths practicable to eliminate joints wherever possible. Lap joints a
minimum of 300 mm 12 inches. Remove torn, punctured, or damaged vapor
barrier material and provide new vapor barrier prior to placing concrete.
For minor repairs, patches may be made using laps of at least 300 mm 12
inches. Seal lapped joints and patch edges with pressure-sensitive
adhesive or tape not less than 50 mm 2 inches wide and compatible with the
membrane. Place vapor barrier directly on underlying subgrade, base
SECTION 03 30 00.00 10
Page 34
course, or capillary water barrier, unless it consists of crushed material
or large granular material which could puncture the vapor barrier. In this
case, a thin layer of approximately 13 mm 1/2 inch of fine graded material
should be rolled or compacted over the fill before installation of the
vapor barrier to reduce the possibility of puncture. Control concrete
placement so as to prevent damage to the vapor barrier.
3.1.4
Perimeter Insulation
**************************************************************************
NOTE: When this paragraph is used, ensure that
drawings indicate location and extent of perimeter
insulation.
**************************************************************************
Install perimeter insulation at locations indicated. Use adhesive where
insulation is applied to the interior surface of foundation walls and may
be used for exterior application.
3.1.5
Embedded Items
Before placement of concrete, determine that all embedded items are firmly
and securely fastened in place as indicated on the drawings, or required.
Conduit and other embedded items must be clean and free of oil and other
foreign matter such as loose coatings or rust, paint, and scale. The
embedding of wood in concrete is permitted only when specifically
authorized or directed. Temporarily fill voids in sleeves, inserts, and
anchor slots with readily removable materials to prevent the entry of
concrete into voids. Do not Weld on embedded metals within 300 mm 12 inches
of the surface of the concrete. Do not tack weld on or to embedded items.
3.2
CONCRETE PRODUCTION
**************************************************************************
NOTE: Use this paragraph and its subparagraphs for
all projects except where designer chooses to use
the following optional paragraph CONCRETE
PRODUCTION, SMALL PROJECTS, provided it meets the
criteria described therein, in which case delete
these. Do not specify both options.
**************************************************************************
3.2.1
General Requirements
**************************************************************************
NOTE: The designer must choose one of the two
bracketed requirements and delete the other. Do not
use the first bracketed requirement if ready-mixed
concrete is not wanted.
**************************************************************************
[Batch and mix concrete onsite or furnish from a ready-mixed concrete
plant. Batch, mix, and transport ready-mixed concrete in accordance with
ASTM C94/C94M, except as otherwise specified. Truck mixers, agitators, and
nonagitating transporting units must comply with NRMCA TMMB 100. Ready-mix
plant equipment and facilities must be certified in accordance with
NRMCA QC 3. Furnish approved batch tickets for each load of ready-mixed
concrete. Conform site-mixed concrete to the following subparagraphs.]
[Batch and mix concrete onsite, or close to onsite, conforming to the
SECTION 03 30 00.00 10
Page 35
following subparagraphs.]
3.2.2
Batching Plant
**************************************************************************
NOTE: Choose the desired bracketed options for
plant locations. Insert desired minimum capacity of
plant, it should be sufficient to accommodate the
largest placement within a reasonable time.
**************************************************************************
Locate the batching plant [onsite in the general area indicated] [or]
[offsite close to the project]. The batching, mixing and placing system
must have a capacity of at least [_____] cubic meters yards per hour.
Conform the batching plant to the requirements of NRMCA CPMB 100 and as
specified; however, rating plates attached to batch plant equipment are not
required.
3.2.3
Batching Equipment
**************************************************************************
NOTE: Retain the bracketed sentence concerning
truck mixers unless it is desired to prohibit truck
mixers. Always retain bracketed item about silica
fume when its use is allowed, otherwise delete.
**************************************************************************
Use semiautomatic or automatic batching controls as defined in
NRMCA CPMB 100. Provide a semiautomatic batching system with interlocks
such that the discharge device cannot be actuated until the indicated
material is within the applicable tolerance. Equip the batching system
with accurate recorder or recorders that meet the requirements of
NRMCA CPMB 100. Record the weight of water and admixtures if batched by
weight. Provide separate bins or compartments for each size group of
aggregate and type of cementitious material, to prevent intermingling at
any time. Weigh aggregates either in separate weigh batchers with
individual scales or, provided the smallest size is batched first,
cumulatively in one weigh batcher on one scale. Do not weigh aggregate in
the same batcher with cementitious material. If both portland cement and
other cementitious material are used, they may be batched cumulatively,
provided that the portland cement is batched first, [except always batch
silica fume separately]. Water may be measured by weight or volume. Do
not weigh or measure water cumulatively with another ingredient. Interlock
filling and discharging valves for the water metering or batching system so
that the discharge valve cannot be opened before the filling valve is fully
closed. Piping for water and for admixtures must be free from leaks and
valved to prevent backflow or siphoning. Furnish admixtures as a liquid of
suitable concentration for easy control of dispensing. Provide an
adjustable, accurate, mechanical device for measuring and dispensing each
admixture. Interlock each admixture dispenser with the batching and
discharging operation of the water so that each admixture is separately
batched and individually discharged automatically in a manner to obtain
uniform distribution throughout the water as it is added to the batch in
the specified mixing period. [When use of truck mixers makes this
requirement impractical, interlock the admixture dispensers with the sand
batchers]. Different admixtures cannot be combined prior to introduction
in water and are not allowed to intermingle until in contact with the
cement. Provide admixture dispensers with devices to detect and indicate
flow during dispensing or have a means for visual observation. Arrange the
SECTION 03 30 00.00 10
Page 36
plant so as to facilitate the inspection of all operations at all times.
Provide suitable facilities for obtaining representative samples of
aggregates from each bin or compartment, and for sampling and calibrating
the dispensing of cementitious material, water, and admixtures. Clearly
mark filling ports for cementitious materials bins or silos with a
permanent sign stating the contents.
3.2.4
Scales
Conform the weighing equipment to the applicable requirements of CPMB
Concrete Plant Standard, and of NIST HB 44, except that the accuracy must
be plus or minus 0.2 percent of scale capacity. Provide standard test
weights and any other auxiliary equipment required for checking the
operating performance of each scale or other measuring devices. Perform
the tests at the specified frequency in the presence of a Government
inspector. Arrange the weighing equipment so that the plant operator can
conveniently observe all dials or indicators.
3.2.5
a.
Batching Tolerances
Tolerances with Weighing Equipment
MATERIAL
PERCENT OF REQUIRED WEIGHT
Cementitious materials
0 to plus 2
Aggregate
plus or minus 2
Water
plus or minus 1
Chemical admixture
b.
0 to plus 6
Tolerances with Volumetric Equipment - For volumetric batching
equipment used for water and admixtures, the following tolerances apply
to the required volume of material being batched:
MATERIAL
PERCENT OF REQUIRED MATERIAL
Water
plus or minus 1
Chemical admixture
3.2.6
0 to plus 6
Moisture Control
Provide a plant capable of ready adjustment to compensate for the varying
moisture content of the aggregates and to change the weights of the
materials being batched.
3.2.7
Concrete Mixers
**************************************************************************
NOTE: Retain bracketed phrase unless it is desired
to prohibit truck mixers, in which case delete.
SECTION 03 30 00.00 10
Page 37
**************************************************************************
Use stationary mixers [or truck mixers] capable of combining the materials
into a uniform mixture and of discharging this mixture without
segregation. Do not charge the mixers in excess of the capacity
recommended by the manufacturer. Operate the mixers at the drum or mixing
blade speed designated by the manufacturer. Maintain the mixers in
satisfactory operating condition, and keep the mixer drums free of hardened
concrete. Should any mixer at any time produce unsatisfactory results,
promptly discontinue its use until it is repaired.
3.2.8
Stationary Mixers
Drum-type mixers of tilting, nontilting, horizontal-shaft, or
vertical-shaft type, or pug mill type provided with an acceptable device to
lock the discharge mechanism until the required mixing time has elapsed.
Conform the mixing time and uniformity to all the requirements in
ASTM C94/C94M applicable to central-mixed concrete.
3.2.9
Truck Mixers
**************************************************************************
NOTE: Delete this subparagraph if truck mixers have
been previously prohibited. Use bracketed item only
for small jobs.
**************************************************************************
Conform truck mixers, the mixing of concrete therein, and concrete
uniformity to the requirements of ASTM C94/C94M. A truck mixer may be used
either for complete mixing (transit-mixed) or to finish the partial mixing
done in a stationary mixer (shrink-mixed). Equip each truck with two
counters from which it is possible to determine the number of revolutions
at mixing speed and the number of revolutions at agitating speed. [Or, if
approved, mark the number of revolutions on the batch tickets.] Do not add
water at the placing site unless specifically approved; and in no case can
it exceed the specified w/c. Inject any such water at the base of the
mixer, not at the discharge end.
3.3
CONCRETE PRODUCTION, SMALL PROJECTS
**************************************************************************
NOTE: Use this paragraph at the designer's option
in lieu of the previous paragraph CONCRETE
PRODUCTION and its subparagraphs, which must then be
deleted, but only when all the following conditions
exist:
(a) There are no particularly critical structural
items.
(b) There are no items of particularly critical
appearance.
(c) No concrete is required with a specified
compressive strength greater than 24.2 MPa 3500 psi.
(d) Not over 1150 cubic meters 1500 cubic yards of
concrete are required.
SECTION 03 30 00.00 10
Page 38
Otherwise, use the above listed previous paragraph
and subparagraphs only. Do not specify both options.
**************************************************************************
Use batch-type equipment for producing concrete. Batch, mix and transport
ready-mixed concrete in accordance with ASTM C94/C94M, except as otherwise
specified. Use truck mixers, agitators, and nonagitating transporting
units in compliance with NRMCA TMMB 100. Ready-mix plant equipment and
facilities must be certified in accordance with NRMCA QC 3. Furnish
approved batch tickets for each load of ready-mixed concrete. Produce
site-mixed concrete in accordance with ACI 301M ACI 301, with plant
conforming to NRMCA CPMB 100. [In lieu of batch-type equipment, concrete
may be produced by volumetric batching and continuous mixing, which conform
to ASTM C685/C685M.]
3.4
LIGHTWEIGHT AGGREGATE CONCRETE
In addition to the requirements specified for normal weight concrete,
conform lightweight aggregate concrete to the following. Base the batching
and mixing cycle on written recommendations from the aggregate supplier
furnished by the Contractor. Unless otherwise directed, charge the mixer
with approximately 2/3 of the total mixing water and all of the aggregate.
Mix this for at least 1.5 minutes in a stationary mixer or 15 revolutions
at mixing speed in a truck mixer. Add and continue mixing the remaining
ingredients as specified for normal weight concrete. Do not vibrate
lightweight aggregate concrete to the extent that large particles of
aggregate float to the surface. During finishing, do not work lightweight
aggregate concrete to the extent that mortar is driven down and lightweight
coarse aggregate appears at the surface. Lightweight aggregate concrete to
be pumped must have a cement content of at least 335 kg/cubic meter 564
lb/cu. yd.[ Perform a field trial run of lightweight aggregate concrete
placement and finishing in accordance with ACI 213R.]
3.5
FIBER REINFORCED CONCRETE
**************************************************************************
NOTE: Only use fiber reinforcing when approved by
the structural designer. Drawings should indicate
where fiber reinforced concrete is located. Fiber
reinforcing is used (1) to help control cracking due
to drying shrinkage and thermal expansion and
contraction, (2) to reduce permeability, (3) to
increase impact capability, shatter resistance,
abrasion resistance, and toughness. Fiber
reinforcing will not: control cracking due to
structural stresses, significantly increase
strength, control curling or creeping, justify
reducing structural members, eliminate control
joints, or replace any moment or structural steel
reinforcement. Include flexural toughness tests
when synthetic reinforcement fibers are used to
increase toughness and when justified by size and
importance of job, but not when fibers are used only
to control shrinkage cracking. Include technical
representative when warranted by size and importance
of job.
**************************************************************************
Provide fiber reinforced concrete conforming to ASTM C1116/C1116M and as
SECTION 03 30 00.00 10
Page 39
follows, using the fibers specified in Section 03 20 00.00 10 CONCRETE
REINFORCING. Use a minimum of 0.9 kg of fibers per cubic m 1.5 pounds of
fibers per cubic yard of concrete. Add fibers at the batch plant.
[Toughness indices must meet requirements for performance level I of
ASTM C1116/C1116M.] Provide the services of a qualified technical
representative to instruct the concrete supplier in proper batching and
mixing of materials.
3.6
TRANSPORTING CONCRETE TO PROJECT SITE
Transport concrete to the placing site in [truck mixers,] [agitators,]
[nonagitating transporting equipment conforming to NRMCA TMMB 100] or by
approved [pumping equipment] [conveyors]. Nonagitating equipment, other
than pumps, cannot be used for transporting lightweight aggregate concrete.
3.7
PLACING CONCRETE
Discharge mixed concrete within 1.5 hours or before the mixer drum has
revolved 300 revolutions, whichever comes first after the introduction of
the mixing water to the cement and aggregates. When the concrete
temperature exceeds 30 degrees C 85 degrees F, reduce the time to 45
minutes. Place concrete within 15 minutes after it has been discharged
from the transporting unit. Handle concrete from mixer or transporting unit
to forms in a continuous manner until the approved unit of operation is
completed. Provide adequate scaffolding, ramps and walkways so that
personnel and equipment are not supported by in-place reinforcement.
Placing will not be permitted when the sun, heat, wind, or limitations of
facilities prevent proper consolidation, finishing and curing. Provide
sufficient placing capacity so that concrete can be kept free of cold
joints.
3.7.1
Depositing Concrete
Deposit concrete in accordance with ACI 301 Section 5 and ACI 304.2R.
3.7.2
Consolidation
**************************************************************************
NOTE: For large jobs, this paragraph may be
expanded. Consolidation equipment and procedures
are described in detail in ACI 309.
**************************************************************************
Immediately after placing, consolidate each layer of concrete in accordance
with ACI 301 Section 5 and ACI 309R.
3.7.3
Cold Weather Requirements
**************************************************************************
NOTE: When the designer is especially concerned
about corrosion of reinforcing steel or embedded
items, or possibility of sulfate attack,
(particularly to prestressing steel) the percentage
of chloride ion in the mixture should be limited.
See ACI Committee 201 report "Guide to Durable
Concrete" and ACI Committee 222 report "Corrosion of
Metals in Concrete" for guidance on control of
chloride ion.
**************************************************************************
SECTION 03 30 00.00 10
Page 40
**************************************************************************
USACE / NAVFAC / AFCEC / NASA
UFGS-03 30 00.00 10 (May 2014)
Change 1 - 02/15
----------------------------------Preparing Activity: USACE
Superseding
UFGS-03 31 00.00 10 (November 2010)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2016
**************************************************************************
SECTION TABLE OF CONTENTS
DIVISION 03 - CONCRETE
SECTION 03 30 00.00 10
CAST-IN-PLACE CONCRETE
05/14
PART 1
GENERAL
1.1
UNIT PRICES
1.1.1
Measurement
1.1.2
Payment
1.2
LUMP SUM CONTRACT
1.3
REFERENCES
1.4
Definitions
1.4.1
Cementitious Material
1.4.2
Chemical Admixtures
1.4.3
Complementary Cementing Materials (CCM)
1.4.4
Design Strength (f'c)
1.4.5
Mass Concrete
1.4.6
Mixture Proportioning
1.4.7
Mixture Proportions
1.4.8
Pozzolan
1.4.9
Workability or Consistency
1.5
SUBMITTALS
1.6
QUALITY ASSURANCE
1.6.1
Laboratory Accreditation
1.6.1.1
Aggregate Testing and Mix Proportioning
1.6.1.2
Acceptance Testing
1.6.1.3
Contractor Quality Control
1.6.2
Quality Control Plan
1.6.3
Pre-installation Meeting
1.6.4
Special Properties and Products
1.6.5
Technical Service for Specialized Concrete
1.6.6
Government Assurance Inspection and Testing
1.6.6.1
Materials
1.6.6.2
Fresh Concrete
1.6.6.3
Hardened Concrete
1.6.6.4
Inspection
1.7
DELIVERY, STORAGE, AND HANDLING
PART 2
PRODUCTS
SECTION 03 30 00.00 10
Page 1
concrete. Deposit the concrete so that it enters the mass of the
previously placed concrete from within, displacing water with a minimum
disturbance to the surface of the concrete. Keep the discharge end of the
pump line or tremie shaft continuously submerged in the concrete. The
underwater seal at start of placing must not produce undue turbulence in
the water. Keep the tremie shaft full of concrete to a point well above
the water surface. Placement proceeds without interruption until the
concrete has been brought to the required height. Do not move the tremie
horizontally during a placing operation, and provide a sufficient number of
tremies so that the maximum horizontal flow of concrete is limited to 5 m
15 feet. Do not deposit concrete in running water or in water with a
temperature below 2 degrees C 35 degrees F.
]3.7.7
Placing Concrete in Congested Areas
**************************************************************************
NOTE: Delete the last sentence when not applicable.
**************************************************************************
Use special care to ensure complete filling of the forms, elimination of
all voids, and complete consolidation of the concrete when placing concrete
in areas congested with reinforcing bars, embedded items, waterstops and
other tight spacing. Use an appropriate concrete mixture, with the nominal
maximum size of aggregate (NMSA) meeting the specified criteria when
evaluated for the congested area. Use vibrators with heads of a size
appropriate for the clearances available, and closely supervise the
consolidation operation to ensure complete and thorough consolidation at
all points. Where necessary, alternate splices of reinforcing bars to
reduce congestion. Where two mats of closely spaced reinforcing are
required, place the bars in each mat in matching alignment to reduce
congestion. Reinforcing bars may be temporarily crowded to one side during
concrete placement provided they are returned to exact required location
before concrete placement and consolidation are completed.
3.7.8
Placing Flowable Concrete
**************************************************************************
NOTE: Delete this paragraph when flowable concrete
is not permitted.
**************************************************************************
If a plasticizing admixture conforming to ASTM C1017/C1017M is used or if a
Type F or G high range water reducing admixture is permitted to increase
the slump, the concrete must meet all requirements of paragraph SYSTEM
DESCRIPTION. Use extreme care in conveying and placing the concrete to
avoid segregation. No relaxation of requirements to accommodate flowable
concrete will be permitted.
3.8
JOINTS
**************************************************************************
NOTE: All joints should be indicated on the
drawings. When some of the joints are not shown,
the Designer must edit this paragraph for
conformance with job requirements.
**************************************************************************
Locate and construct joints as indicated or approved. Locate and construct
joints not indicated to minimize the impact on the strength of the
SECTION 03 30 00.00 10
Page 42
structure. In general, locate such joints near the middle of the spans of
supported slabs, beams, and girders unless a beam intersects a girder at
this point, in which case the offset joint in the girder a distance equal
to twice the width of the beam. Locate joints in walls and columns at the
underside of floors, slabs, beams, or girders and at the tops of footings
or floor slabs, unless otherwise approved. Construct joints perpendicular
to the main reinforcement. Continue and develop all reinforcement across
joints; except that reinforcement or other fixed metal items must not be
continuous through expansion joints, or through construction or contraction
joints in slabs on grade. Reinforcement must be 50 mm 2 inches clear from
each joint. Except where otherwise indicated, construction joints between
interior slabs on grade and vertical surfaces consist of preformed
expansion joint filler extending for the full depth of the slab. The
perimeters of the slabs must be free of fins, rough edges, spalling, or
other unsightly appearance. Form reservoir for sealant for construction
and contraction joints in slabs to the dimensions indicated by removing
snap-out joint-forming inserts, by sawing sawable inserts, or by sawing to
widen the top portion of sawed joints. Clean joints to be sealed and seal
as indicated and in accordance with Section 07 92 00 JOINT SEALANTS.
3.8.1
Construction Joints
**************************************************************************
NOTE: Drawings must show details for construction
joints, including any required dowels or keyways.
Drawings must indicate whether dowels are
conventional smooth "paving" dowels or "structural"
type deformed dowels (tie-bars).
**************************************************************************
For concrete other than slabs on grade, locate construction joints so that
the unit of operation does not exceed [_____] meters feet. Place concrete
continuously so that each unit is monolithic in construction. Do not place
fresh concrete against adjacent hardened concrete until it is at least 24
hours old. Locate construction joints as indicated or approved. Where
concrete work is interrupted by weather, end of work shift or other similar
type of delay, location and type of construction joint is subject to
approval of the Contracting Officer. Unless otherwise indicated and except
for slabs on grade, extend reinforcing steel through construction joints.
Key or dowel construction joints in slabs on grade as indicated. Concrete
columns, walls, or piers must be in place at least 2 hours, or until the
concrete begins to lose its plasticity, before placing concrete for beams,
girders, or slabs thereon. In walls having door or window openings,
terminate lifts at the top and bottom of the opening. Terminate other
lifts at such levels to conform to structural requirements or architectural
details. Where horizontal construction joints in walls or columns are
required, tack a strip of 25 mm 1 inch square-edge lumber, beveled and
oiled to facilitate removal, to the inside of the forms at the construction
joint. Place concrete to a point 25 mm 1 inch above the underside of the
strip. Remove the strip 1 hour after the concrete has been placed, level
off any irregularities in the joint line with a wood float, and remove all
laitance. Prior to placing additional concrete, prepare horizontal
construction joints as specified in paragraph PREVIOUSLY PLACED CONCRETE.
3.8.2
Contraction Joints in Slabs on Grade
**************************************************************************
NOTE: Drawings must indicate desired location and
detail for contraction joints.
SECTION 03 30 00.00 10
Page 43
**************************************************************************
Locate and detail contraction joints as indicated. Produce contraction
joints by forming a weakened plane in the concrete slab using materials and
procedures specified in Section 03 15 00.00 10 CONCRETE ACCESSORIES.
3.8.3
Expansion Joints
conform installation of expansion joints and sealing of these joints to the
requirements of Section 03 15 00.00 10 CONCRETE ACCESSORIES and Section
07 92 00 JOINT SEALANTS.
3.8.4
Waterstops
Install waterstops in conformance with the locations and details indicated
using materials and procedures specified in Section 03 15 00.00 10 CONCRETE
ACCESSORIES.
3.8.5
Dowels and Tie Bars
Install dowels and tie bars at the locations shown on the drawings and to
the details shown, using materials and procedures specified in Section
03 20 00.00 10 CONCRETE REINFORCEMENT and herein. Install conventional
smooth "paving" dowels in slabs using approved methods to hold the dowel in
place during concreting within a maximum alignment tolerance of 1 mm in 100
mm 1/8 inch in 12 inches. Install "structural" type deformed bar dowels,
or tie bars, to meet the specified tolerances. Take care during placing
adjacent to and around dowels and tie bars to ensure there is no
displacement of the dowel or tie bar and that the concrete completely
embeds the dowel or tie bar and is thoroughly consolidated.
3.9
SPECIALTY FLOORS
3.9.1
Heavy Duty Floors
**************************************************************************
NOTE: Heavy duty floors are to be used only for
floors that will receive major traffic of tracked
vehicles or steel wheeled equipment when the
designer is concerned about wear. Moderate amounts
of such traffic can be accommodated by ordinary
concrete floors. If drawings do not indicate areas
to receive heavy duty finish, they must be specified
here. Delete this subparagraph if not required.
Edit bracketed items. Add to and strengthen this
subparagraph as needed but do not delete any of the
listed requirements.
**************************************************************************
Construct heavy duty floors in [areas indicated] [ the following areas
[_____]].
3.9.1.1
General
Construct heavy duty floor by placing a heavy duty bonded topping on a base
slab which has had a rough slab finish left 50 mm 2 inches below final
grade. Concrete in the base slab must be thoroughly hardened but not more
than 30 hours old. The temperature of the fresh concrete topping must not
vary more than 5 degrees C 10 degrees F plus or minus from the temperature
SECTION 03 30 00.00 10
Page 44
of the base slab. The ambient temperature of the space adjacent to the
concrete placement and of the base slab must be between 10 and 30 degrees C
50 and 90 degrees F.
3.9.1.2
Preparation of Base Slab
Keep the base slab continuously damp until topping is placed. Thoroughly
clean the surface of the base slab with an air-water jet immediately before
placing the topping. Thoroughly scrub a thin coat of neat cement grout of
about the consistency of thick cream into the existing surface immediately
ahead of the overlay placing. At the time the neat cement grout is placed,
the existing concrete surface must be damp but no free water present.
Deposit the overlay concrete before the grout coat has had time to stiffen.
3.9.2
Two-Course Floor Construction
**************************************************************************
NOTE: Where it is anticipated that the surface of a
floor slab may be damaged during construction
operations, a two-course floor may be specified with
the second course applied late in the contract. If
the drawings do not indicate areas to receive
two-course floor construction, they must be
specified here. Delete this subparagraph when
two-course floor is not required. Edit bracketed
items.
**************************************************************************
Construct floors with two-course construction in [areas indicated] [the
following areas [_____]] by placing a bonded topping on the thoroughly
hardened concrete base slab which has been left with a rough slab finish 50
mm 2 inches below final grade as indicated. Apply topping at an approved
time late in the contract period. The specified compressive strength of
the floor topping mixture is 34.5 MPa 5000 psi at 28 days, with a 50 mm 2
inch maximum slump, 12.5 mm 1/2 inch maximum size coarse aggregate, and
proportioned to obtain required finishability. Thoroughly clean the
surface of the base slab by sandblasting or high-pressure waterjet
immediately before placing topping. The temperature of the fresh concrete
topping must not vary more than 5 degrees C 10 degrees F plus or minus from
the temperature of the base slab. The ambient temperature of the space
adjacent to the concrete placement and of the base slab must be between 10
and 30 degrees C 50 and 90 degrees F. Keep the base slab continuously wet
for the first 12 hours during the 24 hour period immediately prior to
placing the finished floor. After all free water has evaporated or has
been removed from the surface, scrub in a grout. The grout must be a 1:1
mixture of portland cement and sand passing the 2.36 mm No. 8 sieve mixed
to a creamlike consistency. Scrub the grout into the surface just ahead of
the concrete topping placing operation. While the grout is still damp,
spread and screed and darby or bull float the top course.
3.10
FLOOR HARDENER
**************************************************************************
NOTE: If the drawings do not indicate the areas to
receive floor hardener, they must be specified
here. Normally, floor hardener is not needed. Use
only where extreme dust-free area is required or
where requested by using service.
**************************************************************************
SECTION 03 30 00.00 10
Page 45
Treat the [areas indicated] [following areas [_____]] with floor hardener
applied after the concrete has been cured and then air dried for [14] [28]
days. Apply three coats, each the day after the preceding coat was
applied. For the first application, dissolve 0.5 kg one pound of the
silicofluoride in 4 liters one gallon of water. For subsequent
applications, the solution must be 1.0 kg two pounds of silicofluoride to
each 4 liters gallon of water. Mop the floor with clear water shortly
after the preceding application has dried to remove encrusted salts. Apply
proprietary hardeners in accordance with the manufacturer's instructions.
Ventilate the area during application. Take precautions when applying
silicofluorides due to the toxicity of the salts. Immediately remove any
compound that contacts glass or aluminum with clear water.
3.11
EXTERIOR SLAB AND RELATED ITEMS
**************************************************************************
NOTE: Edit bracketed statements and use these
paragraphs only when minor amounts of specified
items are required in the project. Remove affected
paragraph when pertinent Section (Ex: 32 13 11
CONCRETE PAVEMENT FOR AIRFIELDS AND OTHER HEAVY-DUTY
PAVEMENTS, 32 16 13 CONCRETE SIDEWALKS AND CURBS AND
GUTTERS) is included in the contract.
**************************************************************************
3.11.1
Pavements
Construct pavements where shown on the drawings. After forms are set and
underlying material prepared as specified, place the concrete uniformly
throughout the area and thoroughly vibrated. As soon as placed and
vibrated, strike off the concrete and screed to the crown and cross section
and to such elevation above grade that when consolidated and finished, the
surface of the pavement is at the required elevation. Tamp the entire
surface with the strike off, or consolidated with a vibrating screed, and
continue this operation until the required compaction and reduction of
internal and surface voids are accomplished. Take care to prevent bringing
excess paste to the surface.
3.11.2
Sidewalks
Minimum concrete thickness of 100 mm 4 inches. Provide contraction joints
at 1.75 m 5 feet spaces unless otherwise indicated. Cut contraction joints
25 mm 1 inch deep with a jointing tool after the surface has been
finished. Provide transverse expansion joints 12 mm 1/2 inch thick at
changes in direction and where sidewalk abuts curbs, steps, rigid pavement,
or other similar structures. Provide a transverse slope of 1 mm per 50 mm
1/4 inch per foot, unless otherwise indicated. Limit variations in cross
section to 1 mm per 250 mm 1/4 inch in 5 feet.
3.11.3
Curbs and Gutters
Form, place and finish concrete by hand using a properly shaped "mule" or
construct using a slipform machine specially designed for this work. Cut
contraction joints 75 mm 3 inches deep with a jointing tool after the
surface has been finished. Provide 12 mm 1/2 inch wide expansion joints at
35 m 100 feet maximum spacing unless otherwise indicated.
SECTION 03 30 00.00 10
Page 46
3.11.4
Pits and Trenches
Construct pits and trenches as indicated Place bottoms and walls
monolithically or provide waterstops and keys as approved.
3.12
SETTING BASE PLATES AND BEARING PLATES
**************************************************************************
NOTE: Damp-pack bedding mortar will be specified
for setting base and bearing plates, except that
nonshrink grout will be specified for heavy
machinery bases or where design requires precision
setting of plates or requires that bedding material
have high resistance to shear, impact, or vibration,
and where good damp packing is difficult or
impossible. When using nonshrink grout on important
structures, such as large machinery bases, the grout
should be required to meet ASTM C1107/C1107M, Grade
A, B, or C, grade or grades as selected by the
designer. This nonshrink grout must not be used for
embedding post-tensioned tendons or rock bolts.
Edit bracketed item as appropriate, and delete
entire paragraph if not needed.
**************************************************************************
After being properly positioned, set column base plates, bearing plates for
beams and similar structural members, and machinery and equipment base
plates to the proper line and elevation with damp-pack bedding mortar,
except where nonshrink grout is indicated. The thickness of the mortar or
grout must be approximately 1/24 the width of the plate, but not less than
19 mm 3/4 inch. Concrete and metal surfaces in contact with grout must be
clean and free of oil and grease, and concrete surfaces in contact with
grout damp and free of laitance when grout is placed. Use nonshrink grout
for [_____].
3.12.1
Damp-Pack Bedding Mortar
Damp-pack bedding mortar consists of 1 part cement and 2-1/2 parts fine
aggregate having water content such that a mass of mortar tightly squeezed
in the hand will retain its shape but will crumble when disturbed. Pack
the space between the top of the concrete and bottom of the bearing plate
or base with the bedding mortar by tamping or ramming with a bar or rod
until it is completely filled.
3.12.2
Nonshrink Grout
Ready-mixed material requiring only the addition of water. Water content
must be the minimum that will provide a flowable mixture and completely
fill the space to be grouted without segregation, bleeding, or reduction of
strength.
3.12.2.1
Mixing and Placing of Nonshrink Grout
Mix and placein conformance with the material manufacturer's instructions
and as specified therein. Thoroughly dry-mix ingredients before adding
water. After adding water, mix the batch for 3 minutes. Size batches to
allow continuous placement of freshly mixed grout. Discard grout not used
within 30 minutes after mixing. Fill the space between the top of the
concrete or machinery-bearing surface and the plate solid with the grout.
SECTION 03 30 00.00 10
Page 47
Use wood forms or other equally suitable material for completely retain the
grout on all sides and on top, remove forms after the grout has set.
Carefully work the placed grout by rodding or other means to eliminate
voids; however, avoid overworking and breakdown of the initial set. Do not
subject frout to retempering or to vibration from any source. Where
clearances are unusually small, place under pressure with a grout pump.
Maintain the temperature of the grout, and of surfaces receiving the grout,
at 18 to 30 degrees C 65 to 85 degrees F until after setting.
3.12.2.2
Treatment of Exposed Surfaces
For metal-oxidizing nonshrink grout, cut back exposed surfaces 25 mm 1
inch and immediately cover with a parge coat of mortar consisting of 1 part
portland cement and 2-1/2 parts fine aggregate by weight, with sufficient
water to make a plastic mixture. Smooth finish the parge coat. For other
mortars or grouts, exposed surfaces must have a smooth-dense finish and be
left untreated. Cure in compliance with Section 03 39 00.00 10 CONCRETE
CURING.
3.13
TESTING AND INSPECTION FOR CQC
**************************************************************************
NOTE: For non-critical small projects, less than
1200 cubic meters 1500 cu. yd. of concrete, the
designer may reduce, but not eliminate, the
requirements of this paragraph, and edit it
appropriately for the project specifications.
Otherwise, retain complete.
**************************************************************************
Perform the inspection and tests described below and, based upon the
results of these inspections and tests, take the action required. Submit
certified copies of laboratory test reports, including mill tests and all
other test data, for portland cement, blended cement, pozzolan, ground
granulated blast furnace slag, silica fume, aggregate, admixtures, and
curing compound proposed for use on this project.
a.
When, in the opinion of the Contracting Officer, the concreting
operation is out of control, cease concrete placement and correct the
operation.
b.
The laboratory performing the tests must be onsite and conform with
ASTM C1077. Materials may be subjected to check testing by the
Government from samples obtained at the manufacturer, at transfer
points, or at the project site.
c.
The Government will inspect the laboratory, equipment, and test
procedures prior to start of concreting operations and at least once
per [_____] thereafter for conformance with ASTM C1077.
3.13.1
3.13.1.1
Grading and Corrective Action
Fine Aggregate
At least once during each shift when the concrete plant is operating, there
must be one sieve analysis and fineness modulus determination in accordance
with ASTM C136/C136M and COE CRD-C 104 for the fine aggregate or for each
fine aggregate if it is batched in more than one size or classification.
Select the location at which samples are taken as the most advantageous for
SECTION 03 30 00.00 10
Page 48
control. However, the Contractor is responsible for delivering fine
aggregate to the mixer within specification limits. When the amount
passing on any sieve is outside the specification limits, immediately
resample and retest the fine aggregate. If there is another failure on any
sieve, immediately report the failure to the Contracting Officer, stop
concreting , and take immediate steps to correct the grading.
3.13.1.2
Coarse Aggregate
At least once during each shift in which the concrete plant is operating,
there must be a sieve analysis in accordance with ASTM C136/C136M for each
size of coarse aggregate. Select the location at which samples are taken
as the most advantageous for control. However, the Contractor is
responsible for delivering the aggregate to the mixer within specification
limits. A test record of samples of aggregate taken at the same locations
must show the results of the current test as well as the average results of
the five most recent tests including the current test. Limits may be
adopted for control coarser than the specification limits for samples taken
other than as delivered to the mixer to allow for degradation during
handling. When the amount passing any sieve is outside the specification
limits, immediately resample and retest the coarse aggregate. If the
second sample fails on any sieve, report that failure to the Contracting
Officer. Where two consecutive averages of 5 tests are outside
specification limits, the operation is be considered out of control and
must be reported to the Contracting Officer. Stop concreting and take
immediate steps to correct the grading.
3.13.2
Quality of Aggregates
Thirty days prior to the start of concrete placement, perform all tests for
aggregate quality required by ASTM C33/C33M. In addition, after the start
of concrete placement, perform tests for aggregate quality at least every
three months, and when the source of aggregate or aggregate quality
changes. Take samples for testing after the start of concrete placement
immediately prior to entering the concrete mixer.
3.13.3
Scales, Batching and Recording
Check the accuracy of the scales by test weights prior to start of concrete
operations and at least once every three months. Also conduct such tests
as directed whenever there are variations in properties of the fresh
concrete that could result from batching errors. Once a week check the
accuracy of each batching and recording device during a weighing operation
by noting and recording the required weight, recorded weight, and the
actual weight batched. At the same time, test and ensure that the devices
for dispensing admixtures are operating properly and accurately. When
either the weighing accuracy or batching accuracy does not comply with
specification requirements, do not operate the plant until necessary
adjustments or repairs have been made. Immediately correct discrepancies
in recording accuracies.
3.13.4
Batch-Plant Control
Continuously control the measurement of concrete materials, including
cementitious materials, each size of aggregate, water, and admixtures.
Adjust the aggregate weights and amount of added water as necessary to
compensate for free moisture in the aggregates. Adjust the amount of
air-entraining agent to control air content within specified limits.
Prepare a report indicating type and source of cement used, type and source
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of pozzolan or slag used, amount and source of admixtures used, aggregate
source, the required aggregate and water weights per cubic meter yard
amount of water as free moisture in each size of aggregate, and the batch
aggregate and water weights per cubic meter yard for each class of concrete
batched during each day's plant operation.
3.13.5
3.13.5.1
Concrete Mixture
Air Content Testing
Perform air content tests when test specimens are fabricated. In addition,
make at least two tests for air content on randomly selected batches of
each separate concrete mixture produced during each 8-hour period of
concrete production. Perform additional tests when excessive variation in
workability is reported by the placing foreman or Government inspector.
Conduct tests in accordance with ASTM C231/C231M for normal weight concrete
and ASTM C173/C173M for lightweight concrete. [Plot test results on
control charts. Submit the control charts weekly and make them readily
available to the Government. Keep copies of the current control charts in
the field by testing crews and results plotted as tests are made. When a
single test result reaches either the upper or lower action limit, perform
a second test immediately. Average the results of the two tests and use
this average as the air content of the batch to plot on both the air
content and the control chart for range, and for determining need for any
remedial action. Plot the result of each test, or average as noted in the
previous sentence, on a separate control chart for each mixture on which an
"average line" is set at the midpoint of the specified air content range
from paragraph AIR ENTRAINMENT in PART 1. Set an upper warning limit and a
lower warning limit line 1.0 percentage point above and below the average
line, respectively. Set an upper action limit and a lower action limit
line 1.5 percentage points above and below the average line, respectively.
Plot the range between each two consecutive tests on a secondary control
chart for range where an upper warning limit is set at 2.0 percentage
points and an upper action limit is set at 3.0 percentage points. Samples
for air content may be taken at the mixer, however, the Contractor is
responsible for delivering the concrete to the placement site at the
stipulated air content. If the materials or transportation methods cause
air content loss between the mixer and the placement, take correlation
samples at the placement site as required by the Contracting Officer, and
the control the air content at the mixer as directed.]
[3.13.5.2
Air Content Corrective Action
Whenever points on the control chart for percent air reach either warning
limit, immediately make an adjustment in the amount of air-entraining
admixture batched. As soon as practical after each adjustment, make
another test to verify the result of the adjustment. Whenever a point on
the secondary control chart for range reaches the warning limit,
recalibrate the admixture dispenser to ensure that it is operating
accurately and with good reproducibility. Whenever a point on either
control chart reaches an action limit line, the air content is considered
out of control and the concreting operation immediately halted until the
air content is under control. Make additional air content tests when
concreting is restarted.
]3.13.5.3
Slump Testing
In addition to slump tests which are made when test specimens are
fabricated during concrete placement/discharge, make at least four slump
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tests on randomly selected batches in accordance with ASTM C143/C143M for
each separate concrete mixture produced during each 8-hour or less period
of concrete production each day. Also, make additional tests when
excessive variation in workability is reported by the placing foreman or
Government inspector. [Plot test results on control charts. Submit the
control charts and make them readily available to the Government. Keep
copies of the current control charts in the field by testing crews and
results plotted as tests are made. When a single slump test reaches or
goes beyond either the upper or lower action limit, immediately perform a
second test. Average the results of the two tests and use this average as
the slump of the batch to plot on both the control charts for slump and the
chart for range, and for determining need for any remedial action. Set
limits on separate control charts for slump for each type of mixture. Set
the upper warning limit at 12.5 mm 1/2 inch below the maximum allowable
slump specified in paragraph SLUMP in PART 1 for each type of concrete and,
set an upper action limit line and lower action limit line at the maximum
and minimum allowable slumps, respectively, as specified in the same
paragraph. Plot the range between each consecutive slump test for each
type of mixture on a single control chart for range on which an upper
action limit is set at 50 mm 2 inches. Take samples for slump at the
mixer. However, the Contractor is responsible for delivering the concrete
to the placement site at the stipulated slump. If the materials or
transportation methods cause slump loss between the mixer and the
placement, take correlation samples at the placement site as required by
the Contracting Officer, and the slump at the mixer controlled as directed.]
[3.13.5.4
Slump Corrective Action
Whenever points on the control charts for slump reach the upper warning
limit, make an adjustment immediately in the batch weights of water and
fine aggregate. The adjustments are to be made so that the total water
content does not exceed that amount allowed by the maximum w/c ratio
specified, based on aggregates which are in a saturated surface dry
condition. When a single slump reaches the upper or lower action limit,
deliver no further concrete to the placing site until proper adjustments
have been made. Immediately after each adjustment, make another test to
verify the correctness of the adjustment. Whenever two consecutive
individual slump tests, made during a period when there was no adjustment
of batch weights, produce a point on the control chart for range at or
above the upper action limit, halt the concreting operation immediately,
and take appropriate steps to bring the slump under control. Make
additional slump tests as directed.
]3.13.5.5
Temperature
Measure the temperature of the concrete when compressive strength specimens
are fabricated in accordance with ASTM C1064/C1064M. Report the
temperature along with the compressive strength data.
3.13.5.6
Strength Specimens
Perform on at least one set of test specimens, for compressive strength as
appropriate, on each different concrete mixture placed during the day for
each 380 cubic meters 500 cubic yards or portion thereof of that concrete
mixture placed each day. Perform on additional sets of test specimens, as
directed by the Contracting Officer, when the mixture proportions are
changed or when low strengths have been detected. Develop a truly random
(not haphazard) sampling plan for approval by the Contracting Officer prior
to the start of construction. Show in the plan that sampling is done in a
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completely random and unbiased manner.
a.
A set of test specimens for concrete with a 28-day specified strength
in accordance with paragraph STRENGTH REQUIREMENTS in PART 2 consists
of five specimens, two to be tested at 7 days, two at 28 days, and one
cylinder held in reserve.[ A set of test specimens for concrete with a
[56-day] [90-day] strength in accordance with the same paragraph
consists of eight specimens, two tested at 7 days, two at 28 days, two
at [56] [90] days, and two held in reserve.]
b.
A strength test is the average of the strengths of at least two 150 mm
by 300 mm 6 inch by 12 inch cylinders or at least three 100 mm by 200 mm
4 inch by 8 inch cylinders made for the same sample of concrete.
c.
Mold and cure test specimens in accordance with ASTM C31/C31M, and test
in accordance with ASTM C39/C39M for test cylinders. Immediately
report results of all strength tests to the Contracting Officer.
d.
Maintain quality control charts for individual strength "tests",
("test" as defined in paragraph STRENGTH REQUIREMENTS in PART 1) moving
average of last 3 "tests" for strength, and moving average for range
for the last 3 "tests" for each mixture. Provide charts similar to
those found in ACI 214R.
3.13.6
Inspection Before Placing
Inspect foundations, construction joints, forms, and embedded items in
sufficient time prior to each concrete placement in order to certify to the
Contracting Officer that they are ready to receive concrete. Report the
results of each inspection in writing.
3.13.7
Placing
The placing foreman must supervise placing operations, determine that the
correct quality of concrete or grout is placed in each location as
specified and as directed by the Contracting Officer, and be responsible
for measuring and recording concrete temperatures and ambient temperature
hourly during placing operations, weather conditions, time of placement,
volume placed, and method of placement. The placing foreman must not
permit batching and placing to begin until it has been verified that an
adequate number of vibrators in working order and with competent operators
are available. Do not continue placing if any pile of concrete is
inadequately consolidated. If any batch of concrete fails to meet the
temperature requirements, take immediate steps to improve temperature
controls.
3.13.8
Cold-Weather Protection
At least once each shift and once per day on non-work days, inspect all
areas subject to cold-weather protection. Note any deficiencies, correct,
and report.
[3.13.9
3.13.9.1
Mixer Uniformity
Stationary Mixers
Prior to the start of concrete placing and once every 6 months when
concrete is being placed, or once for every 60,000 cubic meters 75,000
cubic yards of concrete placed, whichever results in the shortest time
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interval, determine uniformity of concrete mixing in accordance with
ASTM C94/C94M.
3.13.9.2
Truck Mixers
Prior to the start of concrete placing and at least once every 6 months
when concrete is being placed, determine uniformity of concrete mixing in
accordance with ASTM C94/C94M. Select the truck mixers randomly for
testing. When satisfactory performance is found in one truck mixer, the
performance of mixers of substantially the same design and condition of the
blades may be regarded as satisfactory.
3.13.9.3
Mixer Uniformity Corrective Action
When a mixer fails to meet mixer uniformity requirements, either increase
the mixing time, change the batching sequence, reduse the batch size, or
adjust the mixer until compliance is achieved.
]3.13.10
Reports
Report all results of tests or inspections conducted, informally as they
are completed and in writing daily. Prepare a weekly report for the
updating of control charts covering the entire period from the start of the
construction season through the current week. During periods of
cold-weather protection, prepare daily reports of pertinent temperatures.
These requirements do not relieve the Contractor of the obligation to
report certain failures immediately as required in preceding paragraphs.
Confirm such reports of failures and the action taken in writing in the
routine reports. The Contracting Officer has the right to examine all
contractor quality control records.
3.14
REPAIR, REHABILITATION AND REMOVAL
Before the Government accepts the structure and final payment is made,
inspect the structure for cracks, damage and substandard concrete
placements that may adversely affect the service life of the structure.
Submit a report documenting these defects, which includes recommendations
for repair, removal and/or remediation to the Contracting Officer for
approval before any corrective work is accomplished.
**************************************************************************
NOTE: Include this paragraph if the concrete
structure is a water tank designed in accordance
with ACI 530.
**************************************************************************
[3.14.1
Crack Repair
Prior to final acceptance, document and repair all cracks in excess of 0.50
mm 0.02 inches wide. Submit the proposed method and materials to repair
the cracks to the Contracting Officer for approval. Address the amount of
movement expected in the crack due to temperature changes and loading.
]3.14.2
Repair of Weak Surfaces
Weak surfaces are defined as mortar-rich, rain-damaged, uncured, or
containing exposed voids or deleterious materials. Diamond grind concrete
surfaces with weak surfaces less than 6 mm 1/4 inch thick to remove the
weak surface. Remove and replace surfaces containing weak surfaces greater
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than 6 mm 1/4 inch thick, or mitigate in a manner acceptable to the
Contracting Officer.
3.14.3
Failure of Quality Assurance Test Results
**************************************************************************
NOTE: Test results accomplished on concrete samples
during concrete production that fall short of the
acceptance criteria alert the Contractor to
something in the production and placement process
that has drifted out of calibration or that an error
has been made. The goal is to track down the problem
and correct it as quickly as possible. Unless the
concrete producer makes a large error in batching or
in placing, the chance that hardened concrete needs
to be removed is remote. Removal and replacement is
a last resort.
**************************************************************************
Do not proceed with proposed mitigation efforts to restore the service life
until approved by the Contracting Officer.
-- End of Section --
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