Discussion
False set in a cement is caused chiefly by
Answer: B
Correct answer: dehydration of the gypsum in a hot mill
A mill running hot drives water out of the gypsum, converting it to hemihydrate or anhydrite. On mixing, that rehydrates rapidly and forms secondary gypsum crystals which stiffen the paste within minutes - a stiffening from crystal growth rather than from cement hydration, which is why it is a false set. Cooling the mill or injecting water controls it.
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