Answer / Prabhat Chaturvedi

Fly ash is a byproduct of coal-fired power plants, and it can be used as a partial replacement for cement in concrete production. The use of fly ash in concrete offers several benefits:

1. Improved workability: Fly ash improves the workability of fresh concrete, making it easier to place and finish.
2. Increased strength: Fly ash enhances the strength and durability of hardened concrete, especially at early ages.
3. Reduced permeability: Fly ash reduces the permeability of concrete, which makes it less susceptible to water penetration and chemical attack.
4. Sustainable: The use of fly ash in concrete helps in waste management by reducing the amount of coal ash that needs to be disposed of.

The percentage of fly ash used in concrete varies depending on its quality and the desired properties of the final product. Typically, up to 30-40% of cement can be replaced by fly ash in concrete without significant loss of strength.

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