Autogenous shrinkage in concrete is mainly caused by
Correct answer: B. Self desiccation during cement hydration
- A. Evaporation from an exposed surface
- B. Self desiccation during cement hydration
- C. Settlement of coarse aggregate
- D. Expansion caused by wetting
Explanation
Autogenous shrinkage results from internal moisture consumption during hydration, especially in low water-cement ratio concrete, which causes self desiccation and internal contraction. Surface evaporation produces drying shrinkage instead.
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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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