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Fly
ash - Background Information
Fly ash
is a burnt residue of pulverised coal (bituminous or sub-bituminous)
and is siliceous in nature. With rapid growth of power sector,
involving commissioning of chain of coal-based thermal power plants in
the country, annual generation of fly ash has crossed 100 million
tonnes (Fig.1) |
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demonstrated in a big way. In addition,
technical feasibility of habitable reclamation of abandoned fly ash
ponds has also been established with focus on environmental aspects of
fly ash ponds on underground water and ambient air quality, besides
its potential for use as geo-engineering and construction material. |
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Efficient management and disposal of this
voluminous low–value by-product has posed serious challenge before the
planners, environmentalists and technocrats. Some of the potential
areas of fly ash utilization have been identified through continuous
R&D efforts in the country and elsewhere. Of these construction
sector, is one where bulk quantities of siliceous materials can be
consumed. These siliceous resources can be gainfully substituted with
fly ash in substantial quantities in construction activities. R&D
efforts at Central Building Research Institute (CBRI), Roorkee have
revealed that fly ash can be gainfully utilized cement and building
products manufacture as well as in civil works with quality and
adequate durability. Fly ash utilization in bricks and block making,
besides in cement manufacture and concrete products
has
been
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Sufficient scientific and technical
information on process technologies for fly ash based building
products is available, yet the utilisation of fly ash has not attained
even the targeted level of 30% of the present generation of fly ash,
in the construction sector. The website on Fly ash (www.enviscbri.org)
provides detailed information on processes, technologies and
products as follows:
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Bricks Manufacture
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Light weight Aggregates
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Cement Manufacture
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Road Construction, Embankments
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Back fills / Land Development
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Mine filling
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