Daraweld®-C Bonding Agent for Concrete Repair - Grace ...

Grace Concrete Products
Daraweld ® -C
Bonding Agent for Concrete Repair
Description
Daraweld ® -C is a polymer emulsion
compounded to form a strong, durable, waterresistant
bond between old and new concrete
surfaces. It is a white, ready-to-use liquid
with a viscosity slightly greater than water.
Chemical Classification: Vinyl Acetate
Copolymer Latex
Physical Appearance: White milky liquid
Total Solids: 51-53%
Viscosity @ 25˚C: 300-700 cps
Specific Gravity (25˚C): 1.07kg ± 0.01kg
Advantages
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Applications
Daraweld-C is a vinyl acetate co-polymer
latex product that when mixed with sand,
stone, cementand water can be used in a wide
variety of applications. It is specifically
beneficial in the following general
applications:
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Ready to use as received.
Simply mix with cement, sand and
water.
For interior and exterior use.
Adheres to most surfaces.
Forms strong, durable bond.
Withstands water exposure.
Bonding agent for concrete
General repair work
Floor applications
Wall applications
Painting and finishing
Special applications
Bonding applications
In the tables listed below, each specific
application is described along with the
materials needed and methods of use. At the
end of the table are the detailed procedures
for mixing and applying the bond grout,
as well as some notes on topping mixes,
finishing and hydration and curing.
Application Procedure
Before mixing with water, thoroughly premix
the cement and fine mason’s sand. In a
separate container combine Daraweld-C with
an equal quantity of water and then add this
liquid to the cement-sand mixture.
While it is recommended that the grout is
machine-mixed, regardless of the mixing
equipment used, the dry and wet ingredients
should be mixed separately.
Mix the grout until the ingredients appear
to be normally blended. Daraweld-C grout
should have the consistency of heavy cream
after it is mixed. Do not overmix or whip air
into the grout, since overmixing can cause
blistering in the surface coating.
Use enough Daraweld-C to make the mix
plastic. Quantities smaller than specified will
lessen bond strength.
It is best to make the Daraweld-C grout in
small batches as it will stiffen and become
hard to apply within 20 to 30 minutes after
mixing. Do not retemper.

1. Bonging Agent for Concrete: Each “X” marks a step to be
completed. Complete the steps in order from left to right.
Do this if concrete
surface to be
repaired is like this
Badly Pitted,
Worn, Broken
Soft, Punky, Scaly,
Friable
Cover with
Grease, Oil,
Foreign matter
Wire Brush
only in
Extreme
Cases
Wash with
Detergent
and Rinse
Acid Etch
and Rinse
Paint or
Spray with
Daraweld-C
Soak with
Water if Dry
Surface Preparation
Scrub in
Daraweld-C
Grout
Level with
Grout or
Topping Mix
X X X X X X
X X X X X X
X X X X X
Extremely Porous X X X X X X
Smooth and
Dense
Newly Placed,
Clean and Sound
X X X X
X X X
Note: With Daraweld-C, concrete surfaces in need of repair do not have to be chipped or scarified. Daraweld-C patches can be featheredged.
Daraweld-C cuts back on labour and preparation time and gives bonded repair thorough dependability through years of wear,
weather, and moisture.
2. General Repair Work Method Materials
Shallow Patching and Thin Resurfacing
(not more than 12mm deep) of Worn,
Broken, Scaled or Spalled Concrete
Surfaces
Steps, Sidewalks, Driveways, Floors,
Walls, Ramps, Roads, Bridges,
Abutments.
Bonding Grout for Thick Patches and
Overlays
Same applications as above and to
bring Highway Sections up to Grade
Filling Fine Cracks
Walls, Floors, Pavements, Structures,
Concrete Products
Thoroughly pre-mix cement and sand. In a separate
container combine Daraweld-C with an equal quantity
of water and add to the cement/sand mixture. Mix
to a cream consistency. Do not overmix. Scrub this
bonding layer onto surface with a stiff bristle brush or
corn broom in a layer no more than 3mm thick. Level
with remaining material while bonding layer is still soft
and plastic.
Follow same method as above for bonding layer. Level
with plain cement mortar or concrete topping and
finish to desired grade. Add air-entraining admixture
to topping mix for maximum durability if overlay will be
exposed to freezing and thawing.
Mix materials until blended into thin paste. On
horizontal surfaces, pour paste into crack to
overflowing and cut off with trowel when stiff. On
vertical surfaces, paint cracks with paste, then fill the
grout as prescribed above for Shallow Patching.
1 part Daraweld-C
5 parts Cement
2 parts Mason’s Sand
1 part Water*
Same materials and
proportions as above
1 part Daraweld-C
5 parts Cement
1 part Water*
3. Floor Applications Method Materials
Non-Skid Floor Treatment
Sidewalks, Patio, Garages, Swimming
Pools, Industrial Floors, Aircraft Hangars
DustProoing Floors
Industrial and commercial Floors,
Warehouses, Garages
Levelling for Floor Tile
Before Application of Vinyl and Asphalt
Tile
Laying Plaster Floor Tile
On wood or Concrete Floors
Apply with scrubbing brush, then swirl to get a rough
finish. This application has been extremely successful
in providing safe, sure footing on surfaces normally
slippery when wet.
Use straight or diluted Daraweld-C, depnding on
porosity of floor to be treated. Pour on and distribute
evenly with squeegee. Sop up puddles with cloths or
sponge, since a heavy concentration of the material
may seal soft. Floor must be closed to traffic for 24
hours to allow for thorough drying.
Apply Daraweld-C grout and level to desired grade.
Allow 24 hours for curing. Apply tile cement directly on
new surfaces. Lay tile.
To adhere plaster tile, brush or squeegee Daraweld-C
as received on wood or concrete surface. Primed with
straight Daraweld-C first if surface is dusty and porous
concrete.
1 part Daraweld-C
5 parts Cement
5 parts Mason’s Sand
1.5 part Water*
Porous Surfaces
Straight Daraweld-C
Dense Surfaces
1 part Daraweld-C
1 part Water*
1 part Daraweld-C
5 parts Cement
10 parts Mason’s Sand
2 part Water*
Straight Daraweld-C
* Water content specified for above applications is approximate. Add more water where necessary for proper consistency.

4. Wall Applications Method Materials
Repairing Walls with Gunite The use of Daraweld-C increases adhesion of Gunite
applications. When added to the mix water, Daraweld-
C also tends to decrease rebound during application,
and allows quicker finishing. To mix Daraweld-C and
water, use a large open drum. Supply gun direct from
drum. An alternate method is to first spray or brush
surface with a 1:1 solution of Daraweld-C and water.
Apply Gunite mortar as usual, while bonding coat is
still tacky.
Patching Stucco Walls Scrub in Daraweld-C paste, and level with stucco
mortar. If entire wall is to be resurfaced, scrub in
Daraweld-C grout and apply finish mortar coat while
grout is still tacky. If wall is to be repainted, refer to
“Painting” section which follows.
Steamproofing Concrete Block
Commercial Launches, Car, Washes,
Poultry Processing Plants etc.
A two-coat application of Daraweld-C paste will
prevent steam and water from penetrating concrete
block walls in commercial and industrial processing
areas. Each coat calls for different proportions of
materials. Both applications should be scrubbed on,
with 24-hour interval between coats.
1 part Daraweld-C to
5 parts Cement
1 part Daraweld-C
1.5 part Water*
1 part Daraweld-C
5 parts Cement
1 part Water*
First coat:
1 part Daraweld-C
3 parts Cement
3 part Water*
Second coat:
1 part Daraweld-C
1 part Cement
1 part Water*
5. Paint & Finishing Method Materials
Finishing Concrete Block Walls Use stiff bristle brush, apply with scrubbing action.
Increasing the Daraweld-C content in the mix will give
a dense, semigloss texture that can be coloured or
painted. One coat is sufficient except where severe
water seepage occurs.
Painting Concrete Block, Brick or
Sandstone
Mix dry and wet ingredients separately. Add dry
mixture to liquid to get paint consistency. Add mineral
pigment for desired colour. Proper proportions of gray
and white portland cement will give matching colour
for concrete blocks. Apply with scrubbing action.
Caution: Do not attempt to apply cement paint over
earlier coat of oil paint.
Stripping Asphalt Surfaces The addition of Daraweld-C to white cement mortar
produces a highly durable stripping material. Mix dry
and wet ingredients separately. Combine mixtures just
before application. Scrub onto clean asphalt surface.
1 part Daraweld-C to
5 parts Cement
10 parts Mason’s Sand
2 parts Water*
1 part Daraweld-C
1 part Cement (white)
1 part Lime
1 part Water*
1 part Daraweld-C
5 parts Cement (white)
2.5 parts Mason’s Sand
1 part Water*
As required colour
6. Special Applications Method Materials
Repairing and Making Special Joints in
Concrete Pipe
Daraweld-C can be used to patch broken or specially
sectioned pipe at the casting plant and in the field.
Mix and scrub thin paste, nesting the broken sections
together until paste is cured. Small breaks and/or
cracks can be filled with this same paste mix, with 2
parts mason’s sand added.
Plugging Core Test Holes Daraweld-C is ideal for repairing the holes created
by removal of test specimens. Core test holes of
10 cm diameter, repaved, with a 5 cm Daraweld-C
patch, showed no break in the bond after 50 cycles of
freezing and thawing.
Repairing Leaking Construction Joints Scrub on Daraweld-C mixture. A patch in the form of
a band or belt approximately 1m wide and 6 mm thick
has worked especially well around leaking construction
joints in concrete tanks.
Reclaiming Prestressed Concrete Prestressed concrete slabs and beams damaged
during handling or by other causes (fire included) can
be repaired with Daraweld-C. Just scrub on standard
Daraweld-C grout if necessary, trowel on a thicker coat
at cracks, corners or surface indentations. Daraweld-C
can be used to fill holes for eyebolts or hooks attached
on the site.
1 part Daraweld-C
5 parts Cement
1 part Water*
Add 20% Daraweld-C by
weight of specified cement.
Reduced water equal to
volume of Daraweld-C added
1 part Daraweld-C
3 parts Cement
1.5 parts Mason’s Sand
0.5 part Water*
1 part Daraweld-C
5 parts Cement
2 parts Mason’s Sand
1 part Water*
* Water content specified for above applications is approximate. Add more water where necessary for proper consistency.

7. Bonding Applications Method Materials
Bonding Concrete to Asphalt Scrub standard Daraweld-C grout onto asphalt surface
with stiff brush or corn broom. For thick overly, top with
mortar or concrete topping while grout is still plastic.
When dry, surface can be painted with cement paint.
(see “Painting” Section)
Bonding Construction Joints When walls or slabs are poured in stages, apply slush
coat of Daraweld-C over the surface of each pour to
obtain integral bond with subsequent pours.
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Daraweld, Darex, AEA and Daravair are registered trademarks of W. R. Grace & Co.-Conn.
1 part Daraweld-C
5 parts Cement
2 parts Mason’s Sand
1 part Water*
Straight Daraweld-C
* Water content specified for above applications is approximate. Add more water where necessary for proper consistency.
Typical Yield (m 2 per litre Daraweld-C for 1.5mm thickness)
Dustproofing: 1.3m 2 /litre Bonding: 3.4m 2 /litre
Find Cracks: 1.6m 2 /litre Non-skid floor: 5.0m 2 /litre
Wide Cracks: 1.9m 2 /litre Floor finishing: 3.6m 2 /litre
Application on the Grout
Scrub Daraweld-C bonding grout onto surface
with a stiff bristle brush or broom in a layer
not more than 3mm thick. Work briskly to
break through surface tensions and entrained
air. In thin patches less than 12mm deep, level
with Daraweld-C grout while the bonding
layer is still soft and plastic.
Topping Mixes
The amount of water used in topping mixes
should be limited as a dry, low water content
mix will result in a dense, hard floor surface.
Use maximum-size aggregate consistent with
depth of overlay.
Apply and level topping material while
Daraweld-C bonding layer is still soft and
plastic. Topping should be dry enough to
require considerable tamping for compaction.
Screed a little high to allow for compaction.
Straight portland cement mortar or concrete
topping exposed to freezing and thawing
should be property air entrained with Darex ®
AEA ® or Daravair ® . No entrained air is
rquired for the Daraweld-C bonding Grount.
Finishing
In thin resurfacing work, wood floating
immediately after screeding will make for
a stronger bond and minimum shrinkage.
For a smooth surface, a single pass with a
steel trowel is recommended. Do not overfinish.
Excessive steel towelling will cause
desiccation, or drying-out. The tamped
topping mixes used in thicker overlays can be
finished normally.
Hydration and Curing
The patch are must be damp. A too-dry
surface will draw water out of the grout
too swiftly to allow proper hydration of the
cement. Excessive towelling or finishing on
thin patches or overlays will delay curing.
Proper curing of the new patch or overlay
will greatly improve its compressive strength
and abrasion resistence, and will prevent
excessive shrinkage.
Packaging and Availability
Daraweld-C is available in bulk quantities
by Grace Construction Products metered
systems, or in 208L drum.
Health and Safety
See Daraweld-C Material Safety Data Sheet
or consult Grace Construction Products.
The information given is based on data and knowledge considered to be true and accurate and is offered for the user’s consideration,
investigation and verification. Since the conditions of use are beyond our control we do not warrant the results to be obtained. Please
read all statements, recommendations or suggestions in conjunction with our conditions of sale including those limiting warranties and
remedies which apply to all goods supplied by us. No statement, recommendation or suggestion is intended for any use which would
violate or infringe statutory obligations or any rights belonging to a third party.
These products may be covered by patents or patents pending. Copyright 2007. W. R. Grace (S) Pte Ltd 24-DW-1B Printed in Singapore 05/07