A.The American Society of Concrete Construction (ASCC) replies: The required surface preparation depends on whether you’re placing a fully bonded topping or an unbonded topping. For a fully bonded application, the topping becomes an integral part of the repaired floor slab. This requires placing the topping on a clean, rough surface for maximum bond development.

Sometimes dry preparation methods such as abrasive blasting are specified to remove grease, oil, paint, and weak concrete. These methods also produce a textured surface that provides mechanical bonding. Another method is to roughen the existing floor to produce 1/4-inch-high ridges. Abrasive blasting won’t produce a profile this deep, so...

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