What is the main function of using fly ash as an admixture in concrete?
Correct Answer: Fly ash is used to enhance workability, reduce permeability, and improve long-term strength of concrete.
- Step 1: Understand what fly ash is. Fly ash is a byproduct from burning coal in power plants.
- Step 2: Learn that fly ash can be added to concrete as an admixture, which means it is mixed in with the concrete ingredients.
- Step 3: Know that one main function of fly ash is to enhance workability, making the concrete easier to mix and pour.
- Step 4: Recognize that fly ash helps reduce permeability, which means it makes the concrete less likely to absorb water and other substances.
- Step 5: Understand that using fly ash can improve the long-term strength of concrete, making it stronger over time.
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