1. 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.
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