Installation Guide
Formulated to reduce the risk of shrinkage cracks, SAKRETE® Crack
Resistant Concrete Mix is a professional strength blend of cementitious
materials, sand, gravel and fi bers. For repair and building jobs where
concrete thickness exceeds 2 inches (50 mm).
Ideal for building walks, drives, patios and steps, as well as pouring
footings and setting posts and poles. Just add water and mix. Elimi-
nates the need for wire mesh in many non-critical applications.
SAFETY:
READ and UNDERSTAND the Material Safety Data Sheet (MSDS) before using
this product. WARNING: Wear protective clothing and equipment. See HMIS
block. For emergency information, call CHEMTREC at 800-424-9300
or 703-527-3887 (outside USA). KEEP OUT OF REACH OF CHILDREN.
PREPARATION:
When repairing concrete, remove all loose and foreign material. Dampen
adjoining concrete surfaces.
MIXING:
Empty the contents into a mortar box, wheelbarrow or mechanical
mixer. When mixing by hand, form a crater for adding water. Add
approximately4 quarts (3.7 L) of clean water per 80 lb. (36.2 kg) bag or
enough to achieve a workable mix. If too stiff, add more water a little at a
time. AVOID A SOUPY MIX. Excess water reduces strength and durability and
can cause cracking. In cold weather use warm water to accelerate the set.
Use cold water to slow the set in hot weather.
PLACEMENT:
Place and consolidate the SAKRETE® Crack Resistant Concrete Mix.
Work the material into voids, then level the surface with a straight edge
board. Allow freshly placed concrete to set about 1 hour or until the surface
water has begun to disappear before fi nishing. Time will vary with weather
conditions.
FINISHING:
Level with a screed and allow the bleed water to evaporate. Use
a fl oat to remove surface imperfections and trowel to a smooth fi nish. For a
rougher surface, use a broom. Refer to ACI 302. Finishing cementitious ma-
terials too early, or over-working the materials can cause dusting, cracking,
scaling and a weak surface.
CURING:
Curing means maintaining proper moisture and temperature. Account for local
environmental conditions when selecting the curing method. High heat, low
humidity or wind will increase the evaporation of water. Keep the surface
damp using a sprinkler, wet burlap, Sakrete Cure ‘N Seal or cover with plastic
for several days as needed. In cold weather adequately cover and keep from
freezing for a minimum of 24 hours. Refer to ACI 308.
STORAGE:
Store in a tightly closed container off the fl oor in a dry place.
When used as directed and in accordance with ASTM C 387 Specifi cation,
80 lb. SAKRETE® Crack Resistant Concrete Mix exceeds 4,000 psi after
28 days.
TECHNICAL DATA:
Exceeds ASTM C 387 when used as directed
Compressive Strength
7 day 2500 psi (17 MPa)
28 day 4,000 psi (28 MPa)
COVERAGE:
To determine coverage: Multiply Length x Width x Thickness all in feet
(meters) = cubic feet (cubic meters): divide by 0.60 cubic feet (0.016 cubic
meters) per bag = Number of 80 lb. (36.2 kg) bags needed for given job.
NOTE: Convert all measurements in inches (mm) to feet (meters). 4 inches
(100 mm) = 0.33 feet (0.1 m).
To determine the number of bags needed: Multiply (length x width x depth),
divided by yield from chart above.
PACKAGING:
80 lb. bag (36.2 kg) - UPC: 7-64661-10080-5
Crack Resistant
Concrete Mix
www.sakrete.com • 866-SAKRETE 866-725-7383
How Much Concrete Do You Need?
Estimate of the number of whole 80 lb. (36.2 kg) bags of
Sakrete Crack Resistant Concrete Mix to place a slab
Area in Sq. Ft. (sq. m) 3 (.03) 6 (.06) 9 (0.8) 15 (1.4) 24 (2.2) 45 (4.2)
Slab 4” thick (100 mm) 2 4 5 9 14 25 Bags
Slab 6” thick (150 mm) 3 5 7 13 20 38 Bags
REV 3-10
Sakrete Crack Resistant CM Tech Data 3-10.indd 1 3/4/2010 12:40:45 PM