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How to Repair Concrete Cracks


Repairing and Sealing Cracks in Concrete.
Concrete is one of the most durable building materials available but because
of its rigid nature exterior concrete can develop cracks due
to uneven drying, shrinkage, temperature changes, ground movement and excessive loads. Once a crack develops, it is important to seal the crack from water to prevent further
deterioration. Flexible sealants are the best solution for cracks that are
subjected to continuous ground movement because they will allow the concrete to
shift without affecting the repair. As with any concrete repair, proper
attention to crack preparation is essential to achieving a successful
result. Using a chisel and Hammer widen the crack to a minimum of one-quarter
inch and break away any deteriorating concrete. The edges of the crack should
be vertical or beveled in an inverted V. Then, remove any loose material with a
brush. For cracks less than one-half inch wide, several repair caulk and sealant options
are available from QUIKRETE. QUIKRETE concrete repair textured acrylic caulk is
designed to match the color and texture of the surrounding surface. Concrete
repair can be used on horizontal or vertical surfaces and dries to a firm,
durable material. To apply concrete repair, simply cut the nozzle tip on an
angle with the utility knife to match the width of the crack and then load the
tube into a standard caulk gun. Slowly draw the gun down the crack, forcing a bead of
concrete repair caulk deep into the crack. Concrete repair can be tooled with the trowel to match the surrounding surface immediately after placement. The material
will begin to form a skin in about 20 to 40 minutes and will harden completely
in one to two hours, depending on temperature, humidity and crack depth.
Concrete repair is a water-based product and can be cleaned up easily with a damp
cloth. Another option for sealing cracks
one half inch wide is QUIKRETE gray concrete crack seal. Concrete Crack Seal is a ready to use, acrylic latex crack sealant that blends with the
natural color of concrete. To apply concrete crack seal,
slowly pour the flow-able sealant from the bottom, over filling the crack
slightly to allow for settling and shrinkage. For cracks deeper and or wider than
one-quarter inch, concrete cracks seal should be applied in multiple lifts,
waiting 24 hours between applications. Concrete Crack Seal will be dry to the
touch in about 30 minutes and hardens in 24 hours. Concrete Crack Seal is water-based and
can be cleaned up with a damp cloth.

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