Ash produced in small dark flecks by the burning of powdered coal or other materials and carried into the air.
- For rigid pavement construction in a large scale, part replacement of cement by dry fly ash is found acceptable.
- Embedded in the concrete floors (made of 45 percent recycled fly ash, the waste material from burned coal), the heating system warms up the flooring.
- He also found a method to make slabs using fly ash, another waste material generated by thermal power generation plants.
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