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Variability and Trends in Iowa Fly Ashes

Published online by Cambridge University Press:  25 February 2011

Scott Schlorholtz ,
Ken Bergeson  and
Turgut Demirel
Scott Schlorholtz
Affiliation:
Department of Civil Engineering, Iowa State University, Ames, IA, 50011
Ken Bergeson
Affiliation:
Department of Civil Engineering, Iowa State University, Ames, IA, 50011
Turgut Demirel
Affiliation:
Department of Civil Engineering, Iowa State University, Ames, IA, 50011
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Abstract

An investigation has been made of the variability of physical and chemical properties of high-calcium (Class C) fly ashes from four Iowa power plants. The investigation summarizes results obtained from three years (1983 through 1985) of monitoring of the various power plants. All four of the power plants burn low-sulfur, sub-bituminous coal from Wyoming. Fly ash samples were obtained from the power plants in accordance to the procedures described in ASTM C 311. Laboratory testing methods were similar to those specified by ASTM C 311. During the three year period, 102 samples were subjected to chemical and physical analysis while an additional 349 samples were subjected to physical analysis only. In general, the four power plants produce fly ashes of similar mineralogy and chemical composition. The observed time variation of the chemical composition of fly ash from a single power plant was quite small. The sulfur content consistently showed the largest coefficient of variation of the 10 elements studied. Physical characteristics of the fly ashes (as measured by ASTM tests) were also fairly uniform over long periods of time, when considered on an individual power plant basis. Fineness, when measured by wet washing using a 325 mesh sieve, consistently exhibited the largest coefficient of variation of any of the physical properties studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 86: Symposium N – Fly Ash and Coal Conversion By-Products III , 1986 , 325
Copyright
Copyright © Materials Research Society 1987

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