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Fly Ash Utilization Policy

Fly Ash Utilization Policy

Fly ash is a byproduct from burning pulverized coal in electric power generating plants. During combustion, mineral impurities in the coal (clay, feldspar, quartz, and shale) fuse in suspension and float out of the combustion chamber with the exhaust gases. As the fused material rises, it cools and solidifies into spherical glassy particles called fly ash. Fly ash is collected from the exhaust gases by electrostatic precipitators or bag filters. The fine powder does resemble portland cement but it is chemically different. Fly ash chemically reacts with the byproduct calcium hydroxide released by the chemical reaction between cement and water to form additional cementitious products that improve many desirable properties of concrete. All fly ashes exhibit cementitious properties to varying degrees depending on the chemical and physical properties of both the fly ash and cement. Compared to cement and water, the chemical reaction between fly ash and calcium hydroxide typically is slower resulting in delayed hardening of the concrete. Delayed concrete hardening coupled with the variability of fly ash properties can create significant challenges for the concrete producer and finisher when placing steel-toweled floors. The policy states that: • Fly ash will be used to make bricks, blocks, tiles, wall panels, cement and other construction materials. • It will save soil excavation and protect environment. • Earlier, use of fly ash was allowed within 100 kms radius of power plant, now it has been extended to 300 kms, the official said. • The policy will create new employment opportunities in the power plant areas and also make available raw material for construction at low cost to help ‘Housing for All’ projects. • Fly ash is a fine, glass powder by-product recovered from gases of burning coal in thermal power plants during production of electricity. They are micron sized earth elements primarily consisting silica, alumina and iron. • The Fly ash causes air pollution, contaminate water and soil systems. • Recyclable Uses Fly ash can be used as a replacement for some of the Portland cement contents of concrete. It can be used in the production of bricks for building construction. Central Government has made it mandatory for use of fly ash bricks in construction activities happening 500km around thermal power plants. Maharashtra has become the first state to adopt Fly Ash Utilisation Policy, paving way for prosperity by generating “wealth from waste”, and environment protection. The policy will create new employment opportunities in the power plant areas and also make available raw material for construction at low cost to help ‘Housing for All’ projects Recyclable Uses: Fly ash can be used as a replacement for some of the Portland cement contents of concrete. It can be used in the production of bricks for building construction. Central Government has made it mandatory for use of fly ash bricks in construction activities happening 500km around thermal power plants.

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