Discussion
Assertion (A): A ready-mixed concrete producer may specify a maximum cement temperature.
Reason (R): Warm cement raises the temperature of the fresh concrete and shortens its working time.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Hot cement raises the temperature of the fresh concrete, and hydration accelerates with temperature, so slump is lost faster and the time available for placing and finishing is shortened. In hot weather that can be decisive, which is why a maximum delivery temperature appears in the specification.
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