The main purpose of entrained air in concrete exposed to freezing and thawing is to
Correct answer: A. Provide pressure-relief spaces for freezing water
- A. Provide pressure-relief spaces for freezing water
- B. Increase cement hydration temperature
- C. Eliminate the need for concrete compaction
- D. Increase the density of hardened cement paste
Explanation
Small, closely spaced air bubbles provide relief spaces for water that expands during freezing. Excessive air, however, can reduce compressive strength, so the air content must be controlled.
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About Concrete Technology
Concrete technology covers cement, aggregates, water and admixtures, including their properties, proportioning and effect on fresh and hardened concrete. It explains workability, water-cement ratio, setting, hydration, strength, durability, curing, mix design and common defects, while distinguishing segregation and bleeding from general loss of workability.
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