A concrete mix has good slump but contains excessive entrapped air because of inadequate compaction. The hardened concrete will most likely have
Correct answer: B. Reduced compressive strength
- A. Higher density and strength
- B. Reduced compressive strength
- C. No change in strength
- D. Greater resistance to all chemical attack
Explanation
Entrapped air creates voids that reduce the effective load-bearing area and therefore lower compressive strength when it is not intentionally controlled. It is different from deliberately entrained microscopic air used for freeze-thaw protection.
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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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