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Observation: Concrete in slab-on-grade floor is cracked (horizontal or vertical separation).

Performance Standard: Cracks in slab-on-grade floors shall not exceed 1/16 inch in width or in vertical displacement.

Corrective Measure: Cracks that exceed the performance standard shall be thoroughly cleaned, filled, and troweled level using a latex fortified cement mixture or other material designed to fill cracks and bond concrete.

Discussion: Cracks may be caused by settlement, soil expansion, concentrated loading, penetrations, drying shrinkage, or temperature changes. Drying shrinkage takes place as concrete sets. The amount of shrinkage depends on the amount of water the concrete holds at the time, the cement content, the type and amount of mixture, and the type and source of the aggregate.