Discussion
A concrete slab has developed a weak dusty surface. The most likely cause is
Answer: C
Correct answer: the surface dried before hydration was complete
A dusty friable surface is the classic symptom of inadequate curing: the water evaporated from the top few millimetres before the cement there had hydrated, so that layer never developed any strength. It is a curing failure rather than a materials fault, and it is prevented by covering, wetting or applying a curing membrane promptly after finishing.
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