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.
This material compiles BS3892; EN450 and ASTM C618 with these three products; RF12, RF20 and RF34 (Retention of material over 45-micron sieve is maximum 12:20 and 34% respectively.
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