Why is the curing period of concrete made with PPC more than that with OPC?
Choose the correct answer
In PPC the secondary (pozzolanic) reaction starts after hydration
In PPC primary hydration starts at a later stage after adding water
In PPC the cement particles are coarser than OPC
In PPC gypsum addition is more than OPC
Correct Answer
A. In PPC the secondary (pozzolanic) reaction starts after hydration
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The pozzolanic reaction consumes the lime liberated during hydration and proceeds slowly after primary hydration, needing longer curing.
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This MCQ belongs to WBPSC AE Previous Years Questions Series. Full tests include timed attempts, rank comparison and subject-wise analysis.