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Journal of Environmental Quality Abstract -

A Proposed Classification System for Coal Fly Ash in Multidisciplinary Research1


This article in JEQ

  1. Vol. 11 No. 4, p. 563-568
    Received: Dec 31, 1981

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  1. W. R. Roy and
  2. R. A. Griffin2



A classification system for coal fly ash has been developed to provide the basis for a uniform nomenclature that can be used by investigators in different disciplines to describe samples of coal fly ash. This system is based on chemical composition, hydration pH, and particle-size distribution. Seven taxonomic groups are generated by the distribution of the sialic (SiO2 + Al2O3 + TiO2), ferric (Fe2O3 + SO3), and calcic (CaO + MgO + Na2O + K2O) components of the fly ashes. Prefixes and suffixes denoting hydration pH, elevated trace and minor element concentrations, and texture are added to the group names to further describe the sample. Classifications of several samples reported in the literature are included and possible applications of the classification system are discussed.

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