If rain begins on a newly placed concrete slab, what is the recommended action?

If rain begins on a newly placed concrete slab, what is the recommended action?

• A. Cover slab where rain is indenting the fresh surface
• B. Continue finishing as if nothing happened
• C. Remove standing water and continue
• D. Apply a curing compound immediately

Answer: (A)

Fresh concrete is still plastic and vulnerable to rain. If rain creates indentations or washes away the surface cement paste, the priority is to shield the surface from further damage and allow proper early curing. Covering the affected area with plastic or another protective cover prevents additional erosion, helps retain moisture for curing, and reduces the risk of creating a rough, weak finish. Finishing or continuing work while the surface is wet or damaged tends to lock in imperfections and undermines strength and appearance. Applying a curing compound right away isn’t reliable once rain is actively wetting the surface; the first step is to protect the surface, then resume curing and finishing when conditions are suitable.

Fresh concrete is still plastic and vulnerable to rain. If rain creates indentations or washes away the surface cement paste, the priority is to shield the surface from further damage and allow proper early curing. Covering the affected area with plastic or another protective cover prevents additional erosion, helps retain moisture for curing, and reduces the risk of creating a rough, weak finish. Finishing or continuing work while the surface is wet or damaged tends to lock in imperfections and undermines strength and appearance. Applying a curing compound right away isn’t reliable once rain is actively wetting the surface; the first step is to protect the surface, then resume curing and finishing when conditions are suitable.