Bulking of fine aggregate is mainly caused by
Correct answer: C. A thin water film around moist sand particles
- A. Chemical expansion of hydrated cement
- B. Complete saturation of coarse aggregate pores
- C. A thin water film around moist sand particles
- D. Loss of air from freshly mixed concrete
Explanation
A thin film of moisture around sand particles pushes them apart and increases the apparent volume of the sand. This effect is called bulking and is important when sand is measured by volume.
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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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