GyanGramWith reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statement…
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With reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct?
1. Fly ash can be used in the production of bricks for building construction
2. Fly ash can be used as a replacement for some of the Portland cement content of concrete
3. Fly ash is made up of silicon dioxide and calcium oxide only and does not contain any toxic elements.
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• Correct Answer: A
• Fly ash is pozzolanic and used in bricks and as Portland cement replacement; improves durability and workability.
• It contains toxic heavy metals (As, Cd, Pb, Hg), so statement 3 is wrong.
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