Which condition most directly causes bleeding in fresh concrete?
Correct answer: B. Upward movement of water through the mix
- A. Downward movement of coarse aggregate
- B. Upward movement of water through the mix
- C. Loss of cement due to surface abrasion
- D. Expansion of aggregate during hydration
Explanation
Bleeding occurs when mixing water rises to the concrete surface because solid particles settle. It is different from segregation, in which coarse aggregate and mortar separate from each other.
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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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