Discussion
Air-entraining admixtures are added chiefly to improve
Answer: D
Correct answer: resistance to freezing and thawing
Entrained air introduces a system of fine, closely spaced, deliberately unconnected bubbles that give freezing water somewhere to expand into, relieving the hydraulic pressure that would otherwise disrupt the paste. The spacing factor matters more than the total air content, since every point in the paste must be within reach of a bubble.
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