ARDEX CD Concrete Dressing ™

ARDEX CD Concrete Dressing ™
ARDEX CD
™
Concrete Dressing
Portland cement-based concrete surface treatment
Resurface worn and spalled concrete to provide
a “new concrete” finish
Easy to apply
Hardens quickly
Freeze-thaw resistant
Suitable for foot and rubber tire traffic on
commercial and residential applications
Use for interior and exterior floors and walls
ARDEX ENGINEERED CEMENTS
400 Ardex Park Drive
Aliquippa, PA 15001 USA
Tel: 724-203-5000
Toll Free: 888-512-7339
Fax: 724-203-5001
www.ardex.com
ARDEX CD
™
Concrete Dressing
Description and Usage
ARDEX CD™ is a Portland cement-based concrete
resurfacing compound modified with high-performance
polymers for exceptional bond strength. Use ARDEX CD
over the surface of existing concrete to produce a new
wear layer, as well as to fill in small surface defects such
as spalls and gouges. Ideal for sidewalks, patios, plazas,
courtyards, walkways, driveways, parking garages,
pool decks and most vertical concrete surfaces. When
mixed with water, the result is a creamy, smooth, slurry
consistency that can be applied by trowel, squeegee
or hopper gun. Once applied, ARDEX CD can be broom
textured before it sets for a reduced-slip surface.
Substrate Preparation
All concrete substrates must be structurally sound, solid,
thoroughly clean and free of any form release, sealers
or paints, patching compounds, dust, dirt, oils and any
other contaminant that could act as a bond breaker. If
necessary, mechanically clean the floor down to sound,
solid concrete by shot blasting, sandblasting, scarifying
or grinding. High-pressure (5000 psi) power washing
may also be used to remove contaminants and weak
surfaces, though the concrete must then be allowed to
dry thoroughly before proceeding. Overwatered, frozen or
otherwise weak concrete surfaces must also be cleaned
down to sound, solid concrete by mechanical methods.
Acid etching, adhesive removers, solvents and sweeping
compounds are not acceptable means of cleaning the
substrate. The use of sanding equipment is not an effective
method to remove curing and sealing compounds.
Clean debris out of expansion joints and tape or mask
the joints off to prevent ARDEX CD from filling the joint.
Use a lawn edger to clean around the walk or driveway,
as well as around planter boxes and landscaped areas.
Substrates must be dry for a successful installation.
Substrate and ambient temperatures must be a minimum
of 50°F (10°C) for the installation of ARDEX products. For
further information, please refer to the ARDEX Substrate
Preparation Brochure.
Cracks and Saw-Cut Joints
ARDEX recommends the use of a rigid, two part epoxy crack
and joint filler. Use the epoxy to fill non-moving (dormant)
cracks greater than a hairline in width (1/32”) in existing
concrete surfaces. The epoxy should be installed in strict
accordance with the installation instructions provided by
the epoxy manufacturer. The filling of dormant cracks
as described above is recommended to help prevent the
cracks from showing through the dressing. However, should
movement occur, cracks will reappear.
In addition, please note that under no circumstances should
ARDEX CD be installed over any moving joints or cracks. All
existing expansion joints, isolation joints, construction joints
and control joints (saw-cuts), as well as any moving cracks,
must be honored up through the topping. Failure to do so
may result in cracking and/or disbonding of the topping.
All moving joints and cracks must be honored up through
the ARDEX CD by installing a flexible sealing compound
specifically designed for use in moving joints, such as ARDEX
ARDISEAL™ RAPID FAST SETTING FLEXIBLE JOINT SEALANT
or similar.
Recommended Tools
Mixing buckets, margin trowel, steel trowel, fine or mediumbristle finishing broom, 3” paintbrush (for edging), squeegee,
hopper gun (where required), ARDEX T-2 Ring Mixing Paddle
and a 1/2” heavy-duty drill (12 mm, min. 650 rpm).
Priming
No priming is required over standard absorbent concrete.
However, to minimize the potential for pinholes forming
in ARDEX CD installed over highly absorbent concrete, as
well as to increase the working time of the ARDEX CD, the
concrete can first be primed with ARDEX CG™ CONCRETE
GUARD™ diluted 1:1 with water. Allow the primer coat to dry
thoroughly (min. 3 hours depending upon jobsite conditions)
and proceed with the installation of ARDEX CD using the
normal installation practices outlined below.
Mixing And Application
For one 40 lb (18 kg) bag of ARDEX CD, use 5 quarts (4.75
liters) of clean water. Pour the water in the mixing container
first, and then add the ARDEX CD. To mix smaller quantities
by hand, use 2.75 parts powder to 1 part of water by
volume. Do not overwater! Use a margin trowel and mix
vigorously for 2 to 3 minutes. For best results, mix with an
ARDEX T-2 Ring Mixing Paddle and 1/2” (12 mm) heavy-duty
drill. Mix thoroughly to obtain a lump-free consistency.
The pot life of ARDEX CD is approximately 30 minutes at
70°F (21°C). If the product begins to set in the bucket within
this time, remix before using. Do not add more water! In
warm weather, use cold water to extend the working time.
Pour the mix onto an area of concrete and flat trowel,
squeegee or broom it onto the surface while applying enough
pressure to ensure good dressing-to-concrete contact.
Maintain a “wet edge” during installation to help minimize
natural color variations that can occur between sections.
Immediately apply a light broom-finish to achieve the desired
texture, working in areas small enough to permit finishing
without walking on the freshly installed dressing. ARDEX
CD has a working time of approximately 10 to 15 minutes,
depending on jobsite conditions.
On vertical surfaces such as walls or stair faces, trowel,
brush or spray the dressing using a hopper gun directly
onto the prepared area. Smooth or brush the material to the
desired finish.
sufficiently to work on without damaging the surface. ARDEX
recommends the use of ARDEX CG CONCRETE GUARD.
For minor patching, filling small holes, gouges or spalls (up
to 1” [25 mm] diameter and 1/2” [12 mm] deep), mix 4 parts
powder to 1 part water by volume and apply to the prepared
surface with a flat steel trowel or putty knife. Repair areas
should be allowed to set firmly (30 to 45 min. at 70°F/21°C)
before applying the finish coat of the dressing. Cool ambient
and surface temperatures will slow setting time. For larger or
deeper repairs, use ARDEX CP™ CONCRETE PATCH.
Reflective Cracking
Thickness Of Installation
ARDEX CD is to be installed in as thin a layer as can be
placed while getting full coverage. Typical installation
thickness ranges from 1/16” up to 1/8” (1.5 to 3 mm), and
ARDEX CD can be applied at a thickness of up to 1/2” (12
mm) in small, well-defined areas (see above). Please note that
thicker areas will take longer to set than a dress coat, and
will reduce the overall coverage.
Color
ARDEX CD is formulated from Portland cement and is
available in gray. As concrete color and jobsite conditions
vary widely, it is not intended that this will match the color of
the concrete being resurfaced or an adjacent concrete pad.
Jobsite conditions such as direct sunlight and wind, as well
as the surface of the dressing being exposed to moisture
before it completely sets, can lead to color variations in the
appearance of the dressing. Should this occur, it can often
be completely corrected by pre-wetting the surface of the
discolored dressing and misting it with a vinegar solution
diluted with 3 parts of water. Allow the vinegar to stand on
the surface for a minimum of 10 minutes without allowing
it to dry. Rinse clean and allow to dry thoroughly. Should
the condition persist, the use of a pigmented sealer such
as ARDEX CG™ CONCRETE GUARD™ (gray or pigmented
tintable base) may be required. Consult the ARDEX Technical
Service Department for additional information.
Curing
Although ARDEX CD requires no special curing procedures,
avoid applying this product if rain is expected within 6 to 8
hours or freezing temperatures could occur within 24 hours
of application. As with any cementitious material, these
conditions can alter the appearance and performance of the
dressing.
Wear Surfaces
As is the case with all concrete surfaces, ARDEX CD
should be sealed with a waterborne, breathable concrete
sealer to prevent dusting and to help resist damage from
standing water, salt and oil, as well as staining and marking.
ARDEX CD can be sealed as soon as the dressing hardens
ARDEX CD is formulated as a highly durable, non-structural
wear surface. As such, it is important to note that no one
can predict with 100% accuracy the appearance of cracking
in a non-structural topping. While there can be several
causes for cracking, it must first be understood that the
installation of a thin layer of non-structural topping is not
capable of restraining movement in the structural slab,
which could lead to reflective cracking. Areas most likely
to telegraph include existing cracks in the floor, control
joints (saw-cuts) and cracks off of the corners. Cracks
may telegraph up into the surface in any area that exhibits
movement.
Notes
The pot life of ARDEX CD is approximately 30 minutes at
70°F (21°C), while the working time is approximately 10 to
15 minutes. Pot life and working time will vary with ambient
temperatures.
Always install an adequate number of properly located test
areas, including the sealer and any desired colorants, to
determine the suitability and aesthetic value of the products
for the intended use. As sealers vary, always contact and
rely upon the sealer manufacturer for specific directives
regarding intended end use of the product.
ARDEX CD is intended for resurfacing interior and exterior
concrete in residential and commercial applications subject
to foot and rubber-wheeled traffic. ARDEX CD is not intended
for industrial uses such as heavy manufacturing or areas
with heavy truck traffic. Do not use in fountains, inside
swimming pools or any areas that will be permanently
submerged.
Do not mix cement or additives. Observe the basic rules
of concrete work. Do not install below 50°F (10°C) surface
and air temperatures. Install quickly if substrate is warm and
follow warm weather instructions available from the ARDEX
Technical Service Department.
Precautions
ARDEX CD contains Portland cement and sand aggregate.
Avoid eye and skin contact. Mix in a well ventilated area and
avoid breathing powder or dust. KEEP OUT OF REACH OF
CHILDREN. Carefully read and follow all cautions and warnings
on the product label.
Technical Data According to ARDEX
Quality Standards
All data based on a mixing ratio of 2.75 parts powder to 1
part water by volume at 70°F (21°C). Physical properties
are typical values and not specifications.
Mixing Ratio:
5 quarts (4.75 L) of water per one 40 lb (18 kg) bag
For smaller batches, mix 2.75 parts powder to 1 part water by volume
Material Requirements: 100 to 120 sq. ft. per bag at 1/16”
on Smooth Substrate (9.3 to 11.1 m2 per bag at 1.5 mm)
(approx.)
50 to 60 sq. ft. per bag at 1/8”
(4.6 to 5.6 m2 per bag at 3 mm)
Application methods and the texture of the concrete being coated will affect these rates.
Compressive Strength: 4000 (281 kg/cm2) psi at 28 days
(ASTM C109/mod –
Air cure only)
Pot Life: 30 minutes
Working Time: Approx. 10 to 15 minutes
Walkable: When coating is thoroughly dry
Install Coating:
Waterborne: When hard (approx. 2 hours)
Rubber-wheeled traffic: Consult sealer manufacturer
VOC: 0 g/L, calculated SCAQMD 1168
Packaging: 40 lb/18 kg net weight
Storage: Store in a cool dry area. Do not leave bags exposed to sun.
Shelf Life: One year if unopened
Warranty:
ARDEX Engineered Cements Standard Limited Warranty applies.
© 2010 ARDEX, L.P. All rights reserved.
AT126 (08/10)
ARDEX Engineered Cements
400 Ardex Park Drive
Aliquippa, PA 15001 USA
Tel: 724-203-5000
Toll Free: 888-512-7339
Fax: 724-203-5001
www.ardex.com
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