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Question
Fly ash can be used as
A.
As an admixture
B.
De-accelerator of carbonation depth
C.
Partial cement replacing material
D.
All of these
Answer ( Option C)

Partial cement replacing material

Solution

Fly Ash:
  • Fly ash is a fairly divided residue that results from the combustion of ground or powdered bituminous coal or sub-bituminous coal like lignite and is transported by the flue gases of boilers fired by pulverized coal or lignite.
  • It is a by-product of many thermal power stations and other plants using pulverized coal of lignite as a source of heat for boilers.
  • Normally, the fly ash contains some unburnt carbon.
  • It is acidic in nature and its main constituents are silica, aluminum oxide, and ferrous oxide.
  • The fly ash usually replaces 20% to 25% of cement by weight or volume.
  • It is partially cement-replacing material.

Note:
The fly ash can be used in the following practical applications:
Addition to mass concrete.
Cellular concrete blocks.
Fly-ash building bricks.

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