Discussion
Concrete is cured by keeping it moist because drying out would
Answer: A
Correct answer: stop the hydration reaction prematurely
Hydration needs water, and if the concrete dries out the reaction stops wherever the water has gone, leaving unhydrated cement and a weak, permeable structure. The surface is the first to suffer, which is why an uncured slab dusts and crazes. Curing keeps the water available until enough of the cement has reacted.
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