Discussion
Assertion (A): Free lime in clinker causes cracking in hardened concrete.
Reason (R): It hydrates slowly and expands after the paste has already set.
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. Free lime that escaped combination in the kiln hydrates slowly, long after the paste has set, and the hydration is accompanied by a volume increase that the hardened material cannot accommodate. The result is unsoundness - cracking and disruption from within - which is why free lime is limited and why the Le Chatelier soundness test exists.
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