Environment And Road Safety Education And Violence Against Women And Children And Drug Abuse 2021 Exam With Answers

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35.

With reference to ‘fly ash’ produced by the power plants using the 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 code given below
A: 1 and 2
B: 2 only
C: 1 and 3
D: 3 only

The answer is: A

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Explanation

The correct answer is 1 and 2.

 • Fly ash is the finely divided residue that results from the combustion of pulverised coal and is transported from the combustion chamber by exhaust gases.
• Fly ash is produced by coal-fired electric and steam generating plants.
• Fly ash is used annually in a variety of engineering applications that includes: portland cement concrete (PCC), soil and road base stabilization, flowable fills, grouts, structural fill and asphalt filler. Portland cement, Embankment, Soil stabilization, Flowable fill, Asphalt concrete, Geopolymers, Roller compacted concrete, Bricks, Metal matrix composites, Waste treatment and stabilization, Catalyst