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Production and Characterization of Fly Ash from New South Wales Coals

Published online by Cambridge University Press:  25 February 2011

Harold Roper ,
Daksh Baweja  and
Graham A. Kirkby
Harold Roper
Affiliation:
School of Civil and Mining Engineering, University of Sydney, N.S.W., Australia, 2006.
Daksh Baweja
Affiliation:
Electricity Commission of New South Wales, Sydney, N.S.W., Australia, 2000.
Graham A. Kirkby
Affiliation:
School of Civil and Mining Engineering, University of Sydney, N.S.W., Australia, 2006.
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Abstract

Factors affecting fly ash characteristics are examined by consideration of the various processes and constituents involved in its production. Coal conversion, boiler-furnace operations and collection procedures are discussed. Current classification schemes applied to fly ash, in particular to those for use as a pozzolanic mineral admixture in concrete are reviewed. The variability of the material is highlighted using physical and chemical data. Shape and size characteristics of selected fly ashes from sources within New South Wales, Australia are illustrated by electron micrographs. The influence of these properties on resultant concrete properties are briefly considered. The formation of nodules of fly ash material on the surface of fabric filters is chosen to illustrate the importance of physical and chemical conditions in the collection chamber, whereas pH changes with time of the water phase in contact with selected fly ashes demonstrate the importance of chemical characteristics of the collected materials. Such chemical characteristics may influence the path of pozzolanic reactions significantly.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 65: Symposium T – Fly Ash and Coal Conversion By-Products II , 1985 , 115
Copyright
Copyright © Materials Research Society 1986

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