The main purpose of compacting freshly placed concrete is to
Correct answer: C. Remove entrapped air voids
- A. Delay cement hydration
- B. Increase the cement content
- C. Remove entrapped air voids
- D. Reduce aggregate size
Explanation
Compaction expels entrapped air and brings the concrete into close contact with reinforcement and formwork. It does not change cement content, stop hydration or crush normal aggregate particles.
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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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