Why is concrete commonly placed in successive layers during compaction?
Correct answer: C. To ensure each layer is properly compacted
- A. To delay cement hydration in lower layers
- B. To increase the water-cement ratio gradually
- C. To ensure each layer is properly compacted
- D. To prevent all contact between adjacent layers
Explanation
Placing manageable layers allows vibration or other compaction to remove entrapped air throughout the depth. The layers should be joined properly so that no weak cold joint forms between them.
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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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