Plastic shrinkage cracks are most likely to develop when
Correct answer: B. Evaporation from the surface exceeds bleeding
- A. Concrete remains fully covered after placement
- B. Evaporation from the surface exceeds bleeding
- C. Aggregate absorption is zero throughout the mix
- D. The final compressive strength is exceeded
Explanation
Plastic shrinkage occurs before concrete has hardened when rapid surface evaporation exceeds the rate at which bleed water reaches the surface. Hot, dry, windy conditions make this problem more likely.
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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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