FLY ASH

Fly ash is a fine powder that is a byproduct of burning pulverized coal in electric generation power plants. ... When used in concrete mixes, fly ash improves the strength and segregation of the concrete and makes it easier to pump.

Ash composition by coal type citation needed : 

Comp.  Bituminous  Subbitumeous  Lignite

SiO2 (%) 20–60          40–60              15–45

Al2O3(%) 5–35           20–30              20–25

Fe2O3(%) 10–40        4–10                 4–15

CaO (%) 1–12             5–30               15–40

LOI (%) 0–15              0–3                   0–5 

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