FLY ASH MATERIALS - slideshare
May 13, 2014· Class F fly ash has pozzolanic properties only. In other word, the burning of harder, older anthracite and bituminous coal typically produces Class F fly ash. This fly ash is pozzolanic in nature, and contains less than 20% lime (CaO). 9. Class C Type Fly ash normally produced by burning lignite or sub- bituminous coal.