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Which admixture is primarily used to reduce the water required for a given workability?

Correct answer: D. Water-reducing admixture

  • A. Accelerating admixture
  • B. Air-entraining admixture
  • C. Expansive admixture
  • D. Water-reducing admixture

Explanation

A water-reducing admixture improves workability at a lower water content or increases workability at the same water content. Accelerators mainly shorten setting time, while air-entraining admixtures deliberately introduce small air bubbles.

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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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