Discussion
Assertion (A): Two clinkers of different aluminate content require different quantities of gypsum.
Reason (R): Gypsum retards the aluminate, so more of that phase demands more retarder.
Answer: A
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. It is the tricalcium aluminate that reacts violently with water and would flash-set, and gypsum controls it by forming ettringite on the aluminate surfaces. More aluminate therefore needs more gypsum, which is why the optimum sulphate content is determined for each clinker rather than fixed by the standard.
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