Discussion
Assertion (A): Two cements of identical clinker composition may differ in early strength.
Reason (R): Fineness of grinding governs how rapidly the available phases can hydrate.
Answer: D
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. Hydration begins at the surface, so the same phases ground finer present more surface and react faster. Two cements from one clinker can therefore differ substantially in early strength, and fineness is the variable a mill operator uses to control it.
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