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 contents of concrete.
3. 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 codes given below.
-
A.
1 and 2
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B.
2 only
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C.
1 and 3
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D.
3 only
Correct Answer:
A. 1 and 2
Explanation:
The correct answer is (a) 1 and 2.
Explanation:
Fly ash is commonly used in the production of bricks for building construction. It is considered a valuable material for making bricks that are durable and lightweight.
Fly ash can be used as a partial replacement for Portland cement in concrete. It improves the strength, durability, and workability of concrete while reducing the amount of cement needed.
The statement that fly ash is made up of silicon dioxide and calcium oxide only and does not contain any toxic elements is incorrect. Fly ash contains various toxic elements such as arsenic, lead, mercury, selenium, and others, which can pose environmental and health risks.
Thus, statements 1 and 2 are correct, while statement 3 is incorrect
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