Abstract

This study of 16 fly ashes from various Colorado and Wyoming coals will show the relationship of coal and fly ash analyses to pozzolanic activity with portland cement. Samples have been followed from the coal source through the power plant combustion and collection system to show the effects upon fly ash quality for use as a mineral admixture in concrete. Each coal source is analyzed using ASTM Method for Proximate Analysis of Coal and Coke [D 3172-73(1984)] and classified by rank under ASTM Classification of Coals by Rank (D 388-84). The ash is analyzed and studied using ASTM Method for Sampling and Testing Fly Ash or Natural Pozzolans for Use as a Mineral Admixture in Portland Cement Concrete (C 311-85).

The problems associated with the present ASTM fly ash classification are shown in these samples by the conflicting data relative to their coal source and chemical analyses. Based upon the existing classifications under ASTM Specification for Fly Ash and Raw or Calcined Natural Pozzolan for Use as a Mineral Admixture in Portland Cement Concrete (C 618-85), both Class C and Class F ashes are studied.

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