Fly Ash
Fly Ash
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Fly ash is the finely divided residue that results from the combustion of pulverized coal and is transported from the combustion chamber by exhaust gases. It is produced by coal-fired electric and steam generating plants.
Types of Fly Ash
There are two types of fly ash
Class C Fly Ash : It is produced from the combustion younger lignite or subbituminous coal.
Class F Fly Ash : It is produced from the burning of harder bituminous coal and older anthracite.
Application of Fly Ash
- Fly Ash is a prime material in many cement products like pouring concrete, Concrete block and brick.
- Mainly it is used in Portland cement concrete pavement or PCC pavement.
- By using fly ash in PCC road construction projects, it gives remarkable economic benefits as it is a great deal of concrete.
- It is also used in embankment construction.
- It is used in roller compacted concrete dams.
- It is used in the making of fly ash bricks.
- In the geopolymer it is used as component.
- It is used as a soil stabilize material.
- It is also used in a mine fill.
- It is used in high performance concrete.
- It is used in cold weather concreting.
Advantages of using Fly Ash
- It is Cost effective substitute for Portland cement.
- It produce dense concrete/brick with smooth surface and
- It has a great workability and it reduces the problem of cracks, permeability, bleeding etc.
- Fly ash is a by product and fly ash concrete reduces CO2 hence it is a environment friendly product.
- It has a good resistance in cold weather.
- It is a non-shrink material.
- It also reduces heat of hydration.
Disadvantages of Fly Ash
- It causes to gain slower strength.
- It can not be used in mass concreting because it is much sensitive to high temperature and gives lower strength.
- This reduce water demand so to gain necessary workability of concrete it is must to use plasticizers/Superplasticizer and air entraining admixture.
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