Title: CHARACTERIZATION AND TECHNIQUES FOR RAPID EVALUATION OF IOWA FLY ASHES
Abstract: An evaluation of seven fly ashes produced from Wyoming coal and available to the construction industry in Iowa is presented. X-ray spectrometry and diffraction were used to determine quantitative elemental and crystalline composition of the seven fly ashes, and long-term, multiple samples were taken at three sources to define variability in elemental composition. It was found that existing ASTM fly ash classification is not necessarily consistent with the coal type, that elemental variability within a single source can be equivalent of that of Type I portland cement, and that quantitative crystalline composition provides information useful for rational categorization. Of the seven fly ashes evaluated, three contained significant amounts of cementitious aluminum bearing phases; and all the fly ashes were comprised of about 25 percent crystalline compounds. Knowledge of cement led to development of a heat evolution test which may be useful in predicting cement content, and an evalaution of crystalline calcium and magnesium oxides suggests that soundness of fly ash-portland cement mortar is not influenced by magnesium oxide but is influenced by the crystalline calcium oxide present in the fly ashes evaluated.
Publication Year: 1983
Publication Date: 1983-01-01
Language: en
Type: article
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Cited By Count: 1
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