Discussion
Assertion (A): Concrete continues to gain strength for months after it has been placed.
Reason (R): Dicalcium silicate hydrates slowly and keeps contributing long after setting.
Answer: C
Both are true and the reason gives the mechanism: the slower of the two silicates is still reacting well beyond the twenty-eight days at which strength is conventionally specified. The twenty-eight day figure is a convention rather than a final value.
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