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Concrete Spall Repair
A concrete spall repair done properly will extend the life of your concrete if fixed early enough. Repairing spalls can be handled in a few ways. Sometimes it is best to break out an entire section and repair it with new concrete rather than patching. With this method, be sure to wear goggles to protect your eyes, ear protection, gloves and a dust mask as cutting or breaking up concrete creates a large cloud of dust. Patching works best for lesser damage in otherwise solid concrete. Use either a prepackaged sand mix or concrete mix and make sure to add a acrylic fortifier. Polyurethane repairs can be done without removing or cutting concrete, just mix and apply.

More about Concrete Spall Repair at
http://www.roklinsystems.com/how-to/concrete-repair-instructions/