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CONCRETE MATERIALS AND TESTING - Minnesota …
dot.state.mn.usD. Fly Ash Fly ash is the most widely used pozzolan in concrete. It is a fine residue resembling cement that is a by-product of burning coal in an electric power generating plant. Depending on the chemical consistency of the coal source, the material is identified as Class C (self-cementing) or Class F (non-cementing) fly ash.