Karma Associate

Fly Ash




Based in Gujarat, we are recognized amongst flourishing Manufacturers, Exporters and Suppliers of Fly Ash across the country and abroad. Our Fly Ash is tested and assured to be free of any foreign substances or impurities. Moreover, it exhibits the best physical & chemical properties. And the best part, we offer the Fly Ash in any quantity required at the bargain prices!

More About Fly Ash :
Fly ash, is one of the residues generated by coal combustion, and is composed of the fine particles that are driven out of the boiler with the flue gases. Ash that falls in the bottom of the boiler is called bottom ash. Fly ash is generally captured by electrostatic precipitators or other particle filtration equipment before the flue gases reach the chimneys of coal-fired power plants, and together with bottom ash removed from the bottom of the boiler is known as coal ash. Depending upon the source and makeup of the coal being burned, the components of fly ash vary considerably, but all fly ash includes substantial amounts of silicon dioxide (SiO2) (both amorphous and crystalline), aluminium oxide (Al2O3) and calcium oxide(CaO), the main mineral compounds in coal-bearing rock strata.
 
Earlier fly ash was vented away. However in the past decade various applications of fly ash have been found and it is a product in huge demand owning to its characteristics. Few of the applications are as mentioned below.

  • Concrete production, as a substitute material for Portland cement and sand
  • Embankments and other structural fills (usually for road construction)
  • Grout and Flowable fill production
  • Waste stabilization and solidification
  • Cement clinkers production - (as a substitute material for clay)
  • Mine reclamation
  • Stabilization of soft soils
  • Road subbase construction
  • As Aggregate substitute material (e.g. for brick production)
  • Mineral filler in asphaltic concrete

 
When mixed with lime and water the fly ash forms a cementitious compound with properties very similar to that of Portland cement. Because of this similarity, fly ash can be used to replace a portion of cement in the concrete, providing some distinct quality advantages. The concrete is denser resulting in a tighter, smoother surface with less bleeding.

 

We are regular exporters of fly ash depending upon the end user requirement. The fly ash is strictly sourced from the high capacity fully automated coal based power plants. The strict maintenance of the coal feed quality enables consistent generation of good quality fly ash. Most of the common grades of fly ash adhering to various standards like ASTM 618, BS EN 450 are as given below :

  • Class F fly ash : The burning of harder, older anthracite and bituminous coal typically produces Class F fly ash. This fly ash is pozzolanic in nature, and contains less than 20% lime (CaO). Possessing pozzolanic properties, the glassy silica and alumina of Class F fly ash requires a cementing agent, such as Portland cement, quicklime, or hydrated lime—mixed with water to react and produce cementitious compounds. Alternatively, adding a chemical activator such as sodium silicate (water glass) to a Class F ash can form a geopolymer.
  • Class C fly ash : Fly ash produced from the burning of younger lignite or sub-bituminous coal, in addition to having pozzolanic properties, also has some self-cementing properties. In the presence of water, Class C fly ash hardens and gets stronger over time. Class C fly ash generally contains more than 20% lime (CaO). Unlike Class F, self-cementing Class C fly ash does not require an activator. Alkali and sulfate (SO4) contents are generally higher in Class C fly ashes.