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Scanning Electron Microscopy and X-Ray Diffraction Analysis of Various Size Fractions of Fly Ash

Published online by Cambridge University Press:  25 February 2011

R. C. Joshi ,
G. S. Natt ,
R. L. Day  and
D. D. Tilleman
R. C. Joshi
Affiliation:
Department of Civil Engineering, The University of Calgary, Calgary, Alberta Canada
G. S. Natt
Affiliation:
Department of Civil Engineering, The University of Calgary, Calgary, Alberta Canada
R. L. Day
Affiliation:
Department of Civil Engineering, The University of Calgary, Calgary, Alberta Canada
D. D. Tilleman
Affiliation:
Department of Civil Engineering, The University of Calgary, Calgary, Alberta Canada
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Abstract

X-ray diffraction and scanning electron microscopic analyses have been performed on the various Western Canadial fly ash fractions and on mixtures of cement and fly ash fractions. The ash mineralogy of hydrated and unhydrated fly ash samples was examined by x-ray diffraction. Results from a study of the morphology of ash particles etched in dilute hydrofluoric acid are also included. Scanning electron microscopy indicates that most of the reactive portion of the ash is on the particle surface. Also, as the fly ash particle size increases, the amount of crystalline SiO2 increases but the quantity of calcium containing compounds decreases. Crys~alline SiO2 (the majority of which is present in the +75 μm fraction) does not take part in self-hardening reactions but does appear to take part in pozzolanic reactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 43: Symposium M – Fly Ash and Coal Conversion By-Products I , 1984 , 31
Copyright
Copyright © Materials Research Society 1985

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