Silica fume improves the durability of concrete mainly by
Correct answer: A. Refining pores and reducing permeability
- A. Refining pores and reducing permeability
- B. Increasing the size of capillary pores
- C. Replacing all cement hydration products with air
- D. Preventing aggregate particles from absorbing water
Explanation
Silica fume reacts pozzolanically and fills or refines pores in the cement paste, producing a denser microstructure. This commonly lowers permeability, although it can increase water demand unless the mix is adjusted.
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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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