Discussion
Assertion (A): Concrete cured at a high temperature may finish weaker than the same mix cured cool.
Reason (R): Rapid early hydration produces a coarser and less uniformly distributed gel.
Answer: A
Both are true and the reason gives the mechanism: the product forms too quickly to distribute itself evenly through the space available, leaving a microstructure that carries load less efficiently. Steam curing trades ultimate strength for early turnaround.
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