Fosroc Conbextra HF TDS

Fosroc Conbextra HF TDS
Fosroc® Conbextra HF
High fluid flow, dual shrinkage
compensated, precision grout - (gaps 10
mm to 125 mm thickness)
Conbextra HF is a blend of Portland cements, graded fillers
and chemical additives which impart controlled expansion in
both the plastic and hardened states.
The filler grading minimises segregation and bleeding over a
wide range of application consistencies.
Conbextra HF is used for free flow precision grouting in a
wide range of applications. Recommended applications
Maximum aggregate size for pumping is 2.5 mm.
„„ Critical machine base plates, sole plates and columns
Parchem offers a comprehensive range of high performance,
high quality construction products. In addition, the company
offers a technical support package to specifiers and
contractors as well as technical advice from staff
experienced in the construction industry.
Technical Support
„„ Joints between pre-cast concrete panels
„„ Pumped grouting applications
„„ Grouting applications where pouring access is restricted
Specification Clauses
„„ Anchoring of reinforcing steel bars
„„ Installation of tie bars
Supplier specification
All precision grouting (specify details and areas of
application) must be carried out using Conbextra HF
manufactured by Parchem and used in accordance with the
manufacturer’s current Technical Data Sheet.
„„ Excellent initial flow and flow retention
„„ Rapid strength gain facilitates efficient installation and
operation of plant
Performance specification
„„ High ultimate strength and low permeability ensure
durability of the hardened grout
To the nominated area(s) (specify details and areas of
application), grouting must be carried out using a prepackaged, non-metallic and chloride free, dry powder blend
of cements, graded fillers and chemical additives.
„„ Hydrogen-free gaseous expansion
„„ Chloride free
It is to be mixed with clean water to the required consistency.
The plastic grout must not bleed or segregate. The storage,
handling and placement of the grout must be in strict
accordance with the manufacturer’s instructions.
„„ Suitable for pumping or pouring
Standards Compliance
AS 1478.2-2005 Appendix E Early Volume Change
A positive volumetric expansion up to 3% shall occur while
the grout is plastic by means of a gaseous, hydrogen free
system. Additionally the grout is to be formulated to
compensate for longer term expansion in the hardened state.
AS 1478.2-2005 Table Consistency
Conbextra HF, shrinkage compensated cementitious
precision grout, is supplied as a ready to use dry powder.
The addition of a controlled amount of clean water produces
a free-flowing precision grout for gap thicknesses up to 125
mm. In addition the low water requirement ensures high early
strength and long term durability.
October 2014
It shall exhibit Flow Characteristics when tested to AS
1478.2.2005 of 10 - 30 seconds using the flow cone
The compressive strength of the grout must exceed 40MPa
at 7 days and 60MPa at 28 days.
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Fosroc® Conbextra HF
Test Method
Compressive Strength
Bond Strength by Pull Off
AS 1478.2:2005
Water Addition
1 Day
7 Days
28 Days
EN 1542:1999
Chloride ion Content
EN 1015-17:2000
Fire Rating
EN 13687-1:2002
Class A1 Non-Combustible
Flexural Strength (Modulus
of Rupture)
AS 1012.11 - 2000
1 Day
7 Days
28 Days
3.2 MPa
9.5 MPa
10.0 MPa
Indirect Tensile Strength
AS 1012.10.2000
1 Day
7 Days
28 Days
2.5 MPa
4.5 MPa
4.7 MPa
Setting Time
AS 1012.18:1996
5.5 hours - initial set
7.5 hours - final set
Fresh Wet Density
2200 kg/m³ - depending on consistency used
Alkali reactive particles
Rapid Mortar Bar
Test (RTA T363)
Flow Characteristics
AS 1478.2:2005
19-25 seconds (Flow Cone)
Minimum Thickness
Maximum Thickness
Clarification of property values: The typical properties given above are derived from laboratory testing. Compressive strengths
stated above were measured using cube samples. Test results obtained will vary if carried out to an alternative standard or
sample dimensions are used.
Note: Compressive strengths stated were measured at bottom end water, eg., the 28 day strength of 62 MPa for flowable
consistency was obtained at a water addition of 3.6 litres water per 20kg bag of Conbextra HF.
Test Results to ASTM Specification C1107: 2001
Test Method
Flow Consistency
ASTM C1437:2007
Setting Time
ASTM C191:2008
Plastic Volume Change
ASTM C1090:2010
Hardened Volume Change
1 day
3 days
14 days
28 days
56 days
Compressive Strength
ASTM C109:2011b
1 day
3 days
7 days
28 days
34.4 MPa
53.5 MPa
63.7 MPa
70.1 MPa
5.75 hours
6.75 hours
Note: All tests were carried out at 25oC ± 2oC until the age of the test. All above test results are independent third party results.
Copies of these test results are available on request. The tests were carried out at a water addition rate of 3.6L per 20kg.
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Fosroc® Conbextra HF
Consistency of mixed grout
The flow distances given below in (mm) are intended as a guide. Actual flow distances will vary depending on site conditions:
Gap Depth
Flowable 100mm head
Flowable 250mm head
Fluid 100mm head
Fluid 250mm head
For best results a mechanically powered grout mixer should
be used. When quantities up to 40 kg are used, a slow speed
drill fitted with a high shear mixer with a minimum 1200W
and between 300-650 rpm. The Protool MXP 1602 E mixer
(product code: TT-621941) or equivalent is recommend with
the Protool HS2 140 x 600 M14 Helical mixing paddle
(product code: TT-614217) or equivalent.
Foundation surface
The substrate surface must be free from oil, grease or any
loosely adherent material. If the concrete surface is defective
or has laitance, it must be cut back to a sound base. Bolt
holes or fixing pockets must be blown clean of any dirt or
Larger quantities will require a high shear vane mixer. Do not
use a colloidal impeller mixer.
Several hours prior to grouting, the area of cleaned
foundation should be flooded with fresh water. Immediately
before grouting takes place, any free water should be
removed. Particular care should be taken to blow out all bolt
holes and pockets.
It is essential that machine mixing capacity and labour
availability is adequate to enable grouting operation to be
carried out continuously. This may require the use of a
holding tank with provision for gentle agitation to maintain
Base plate / grout interface
The selected water content should be accurately measured
into the mixer. Slowly add the total contents of the Conbextra
HF bag, mix continuously for 5 minutes, ensuring a smooth,
even consistency is obtained.
It is essential that this is clean and free from oil, grease,
scale, paint or coating of any kind. Air pressure relief holes
should be provided to allow venting of any isolated high
Deeper grout pours
Levelling shims
If these are to be removed after the grout has hardened, they
should be treated with a thin layer of grease.
Place the grout within 15 minutes of mixing to gain the full
benefit of the expansion process.
The formwork should be constructed to be leakproof as
Conbextra HF is a free flowing grout. This can be achieved
by using foam rubber strip or Construction Silicone* beneath
the constructed formwork and between joints.
In some cases it is practical to use a sacrificial semi-dry sand
and cement formwork. The formwork should include outlets
for the pre-soaking water.
The unrestrained surface area of the grout must be kept to a
minimum. Generally the gap width between the perimeter
formwork and the plate edge should not exceed 150 mm on
the pouring side and 50 mm on the opposite side. There
should be no gap at the flank sides.
Where grout gap depth is in excess of 125 mm up to 500
mm, Conbextra Deep Pour should be used.
Conbextra HF can be placed in thicknesses from 10 mm up
to 125 mm in a single pour when used as an underplate
grout. Where the grouting gap beneath the base plate
exceeds the maximum thickness allowed, then the grout can
filled / bulked out with Conbextra Grout Aggregate* to
minimise exotherm heat build up. Alternatively Conbextra
Deep Pour is available for pours up to 500 mm thick.
Filling/bulking out of the grout should not exceed a ratio of
1:1. Please refer to the Conbextra Grout Aggregate TDS for
more guidance on bulking out of cement based grouts.
Any bolt pockets must be grouted prior to grouting between
the substrate and the base plate. Continuous grout flow is
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Fosroc® Conbextra HF
Removable hopper: For larger pours the grout may be hand
placed or pumped into a removable hopper (trough).
Sufficient grout must be available prior to starting and the
time taken to pour a batch must be regulated to the time
taken to prepare the next one. Continual grout pour must be
The mixed grout should be poured only from one side of the
void to eliminate the entrapment of air or surplus pre-soaking
water. This is best achieved by pouring the grout across the
shortest distance of travel.
The grout head must be maintained at all times so that a
continuous grout front is achieved.
Low temperature working
When the air or contact surface temperatures are 5°C or
below on a falling thermometer, warm water (30-40°C) is
recommended to accelerate strength development.
For ambient temperatures below 10oC the grout consistency
should be flowable and the formwork should be maintained
in place for at least 36 hours.
Normal precautions for winter working with cementitious
materials should then be adopted.
High temperature working
Please refer to the Conbextra Cementitous Grouts
Application Guide for further information. This is available
from the website or your local Parchem branch.
At ambient temperatures above 35°C the mixed grout should
be stored in the shade. Cool water (below 20°C) should be
used for mixing the grout.
Where large volumes have to be placed Conbextra HF may
be pumped. A heavy duty diaphragm pump is recommended
for this purpose. Screw feed and piston pumps may also be
suitable. Maximum aggregate is 2.5 mm. Ensure pump is
capable of pumping this size aggregate.
201050 - Conbextra HF is supplied in 20 kg moisture
resistant bags.
On completion of the grouting operation, exposed areas
should be thoroughly cured. This should be done by the use
of Concure WB curing membrane, continuous application of
water and/or wet hessian.
(AS 1478.2-2005 Table
(Litres of mixed
Conbextra HF should be removed from tools and equipment
with clean water immediately after use. Cured material can
be removed mechanically.
Conbextra HF has a shelf life of 12 months if kept in a dry
store in sealed bags. If stored in high temperature and high
humidity locations the shelf life may be reduced.
Important notice
A Safety Data Sheet (SDS) and Technical Data Sheet (TDS) are available from the Parchem website or upon request from the nearest Parchem sales office. Read the SDS and TDS carefully
prior to use as application or performance data may change from time to time. In emergency, contact any Poisons Information Centre (phone 13 11 26 within Australia) or a doctor for advice.
Product disclaimer
This Technical Data Sheet (TDS) summarises our best knowledge of the product, including how to use and apply the product based on the information available at the time. You should read
this TDS carefully and consider the information in the context of how the product will be used, including in conjunction with any other product and the type of surfaces to, and the manner in
which, the product will be applied. Our responsibility for products sold is subject to our standard terms and conditions of sale. Parchem does not accept any liability either directly or indirectly for
any losses suffered in connection with the use or application of the product whether or not in accordance with any advice, specification, recommendation or information given by it.
*Manufactured and sold under license from Fosroc International
Limited. Fosroc and the Fosroc logo are trade marks of Fosroc
International Limited, used under license. *Denotes a trade mark of
Fosroc International Limited.
Page 4
Parchem Construction Supplies Pty Ltd
7 Lucca Road, Wyong NSW 2259
Phone: 1300 737 787
ABN 80 069 961 968
Distributed in New Zealand by: Concrete Plus Ltd
23 Watts Rd, Sockburn 8042 Ph: 03 343 0090
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