Discussion
Assertion (A): Entrained air improves durability while slightly reducing strength.
Reason (R): The bubbles relieve freezing pressure but also add voids to the paste.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason states both effects of the same bubbles. The voids relieve freezing pressure, which is the point, and they also reduce the solid volume of the paste, costing roughly five per cent of compressive strength for each one per cent of air. In an exposed structure that is a trade well worth making, since a concrete destroyed by frost has no strength at all.
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