FLY ASH BRICK PROJECT: FEASIBILITY STUDY USING CVP
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Removing this top layer makes the land infertile for a long period. Using fly ash for making bricks instead of clay would thus help preserve the fertility of the soil. Second, it was estimated that there would be a substantial shortfall in the availability of different types of building materials, including bricks. 3 With the country growing at such a rapid pace, the government was keen on promoting fly ash bricks in the construction sector. This would enable a waste product to be used as a construction material and also conserve the environment and resources.
The National Thermal Power Corporation (NTPC) of India had developed technology to replace burnt clay bricks with fly ash as a construction material for building walls. The manufacturing process for these bricks, known as fly ash-lime-gypsum bricks, required intimate mixing of fly ash, sand, lime and gypsum.
Gypsum and lime were first ground to fine particles and then fly ash and sand added to make a fine blend.
The ratio of the input material was as follows:
Fly ash: 60 to 80 per cent
Sand: 10 per cent
Gypsum: 10 per cent
Lime: 10 to 20 per cent
Water was added to the mix to form a paste after which the mixture was transferred to moulds fitted in a hydraulic/mechanical press. The bricks were later dried in the open for one or two days and then cured using water. A process outline for manufacturing fly ash bricks is given in Exhibit 1.