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A Proposed Classification System for Coal Fly Ash in Multidisciplinary Research¹

ABSTRACT

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.

Key Words: chemical analysis • compositional trends • fly ash utilization • coal residues

¹ Contribution of the Illinois State Geological Survey, Champaign, IL 61820. Funded in part by the Illinois Dep. of Energy and Natural Resources as Project no. 90.026.

² Assistant Geochemist and Head of Geochemistry Section, respectively.

Received for publication December 31, 1981.

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