Which factor most directly increases the water demand of a concrete mix?
Correct answer: C. A greater proportion of angular aggregate
- A. A reduction in aggregate surface area
- B. A lower cement content at constant paste volume
- C. A greater proportion of angular aggregate
- D. The use of saturated surface-dry aggregate
Explanation
Angular and rough-textured aggregate has greater surface area and interparticle friction, so more water is needed for the same workability. Saturated surface-dry aggregate does not absorb or release mixing water.
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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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