Fly Ash
Fly ash is a heterogeneous by-product material produced in the combustion process of coal used in power stations. It is a fine grey coloured powder having spherical glassy particles that rise with the flue gases. As fly ash contains pozzolanic materials components which reach with lime to form cementatious materials. Thus Fly ash is used in concrete, mines, landfills and dams.
Manufacturing Fly Ash Since 1994
The physical properties of fly ash are,
1. Fineness of Fly Ash
As per ASTM, the fineness of the fly ash is to be checked in both dry n wet sieving. The fly ash sample is sieved in 45 micron sieve and the percentage of retained on the 45 micron sieve is calculated. Further fineness is also measured by LeChatelier method and Blaine Specific
Surface method.
2. Specific Gravity of Fly Ash
The specific gravity of fly ash ranges from a low value of 1.90 for a sub-bituminous ash to a high value of 2.96 for an iron-rich bituminous ash.
3. Size and Shape of Fly Ash
As the flyash is a very fine material, the particle size ranges in between 10 to 100 micron. The shape of the fly ash is usually spherical glassy shaped.
4. Colour
The colour of the fly ash depends upon the chemical and mineral constituents. Lime content in the fly ash gives tan and light colours where as brownish colour is imparted by the presence of iron content. A dark grey to black colour is typically attributed to an elevated un-burned content.
Chemical Composition of Fly Ash Manufactured
| Component | Bituminous Coal | Sub bituminous Coal | Lignite Coal |
| SiO2 (%) | 20-60 | 40-60 | 15-45 |
| Al2O3 (%) | 5-35 | 20-30 | 20-25 |
| Fe2O3 (%) | 10-40 | 4-10 | 4-15 |
| CaO (%) | 1-12 | 5-30 | 15-40 |
| LOI (%) | 0-15 | 0-3 | 0-5 |
Applications of Fly Ash
- Used in the manufacture of Portland cement.
- Typically used for embankment construction.
- Used as a soil stabilisation material.
- Fly ash is also used as a component in the production of flowable fill.
- Used as the filler mineral in asphalt road laying to fill the voids.
- Fly ash is used as component in geoploymers.
- Used in Roller compacted concrete dams.
- Used in the manufacture of fly ash bricks
- When flyash is treated with silicon hydroxide, it acts as a catalyst.
Fly Ash Manufacturing in Kumarasamy Industries
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75-2, Sathayamoorthy Street, IOB upstairs, Near BSNL Office, Panruti, Cuddalore dist, Tamilnadu, India - 607106
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480/2, Kumbakonam main road, Kadampuliyur village, Panruti , Cuddalore District,
Tamilnadu, India - 607103
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