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Characterisation of Fly Ash Hydration Reactions from Microstructure

Published online by Cambridge University Press:  25 February 2011

R. H. Mills
R. H. Mills*
Affiliation:
Department of Civil Engineering, University of Toronto, 35 St. George St., Toronto, Ontario, Canada M5S 1A4
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Abstract

Reaction products of high lime fly ash (FA), mixed with distilled water and hydrated in contact with Portland cement (PC), and in hardened PC/FA pastes of various mix proportions, were examined by SEM and EDX. Structures contributing to early strength originated mainly through solution depositions of ettringite, and portlandite. Some evidence of ettringite instability suggested gypsum deficiency in PC/FA mixtures.

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