With reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct?
- Fly ash can be used in the production of bricks for building construction.
- Fly ash can be used as a replacement for some of the Portland cement content of concrete.
- Fly ash is made up of silicon dioxide and calcium oxide only and does not contain any toxic elements.
Select the correct answer using the code given below
Detailed Explanation:
✅ Statement 1 – Correct: Fly ash possesses pozzolanic properties that enhance the strength and durability of bricks used in construction.
✅ Statement 2 – Correct: Fly ash can replace 20-30% of Portland cement in concrete, improving workability, reducing heat of hydration, and increasing long-term strength.
❌ Statement 3 – Incorrect: While fly ash mainly contains SiO2, Al2O3, and CaO, it also contains trace amounts of heavy metals like arsenic, mercury, chromium, and lead.
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