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Carbon content in fly ash is important consideration for use with cement; it should be as low as possible. The fineness of fly ash should be as high as possible. The silica contained in fly ash should be present in finely divided state since it combines slowly over a very long period with the lime liberated during the hydration of the cement. Curing the temperature of 38 degree has been found to greatly accelerate its contribution to the strength of concrete Pulverized fuel ash is available in large quantities in the country as a waste product from a number of thermal power stations and industrial plants using pulverized or crushed or ground coal or lignite as fuel for boilers Pulverized fuel ash to be used as Pozzolana in cement, cement mortar and concrete in accordance with this standard shall be fly ash only which may be either in as collected condition or beneficiated, segregated or processed. This standard was first published in 1966 in three parts to cater to the requirements of fly ash for three specific uses: Part 1 covering use of fly ash as a Pozzolana, Part 2 covering use of fly ash as an admixture for concrete, and Part 3 covering use of fly ash as fine aggregate for mortar and concrete Slump loss of concrete increases with increase in water cement ratio of concrete. For water cement ratio 0.35 without any admixtures, initial slump cannot be measured by slump cone test as it is very less. Ultimate compressive strength of concrete decreasing with increase in ratio of concrete. Slump loss of concrete goes on increasing with increase of quantity of fly ash. The 10% and 20% replacement of cement with fly ash shows good compressive strength for 28 days. The 30% replacement of cement with fly ash ultimate compressive strength of concrete decreases.

Fly Ash Utilization in Structural Concrete for Sustained Construction