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Autoclave Expansion of Portland Cement-Fly Ash Pastes

Published online by Cambridge University Press:  25 February 2011

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

The influence of the chemical composition of fly ash on the autoclave expansion of portland cement-fly ash pastes has been studied. The autoclave expansion tests were performed as described in ASTM C 151–81. Several of the cement-fly ash pastes tested exhibited severe expansive behavior. Free lime (CaO) was the only single variable that correlated well with the expansion observed in the autoclave tests. A multivariable model was generated in which lime, magnesium oxide, and tricalcium aluminate were the significant variables. The autoclave expansion of portland cement-fly ash pastes appears to be quite sensitive to the amount of free lime present in a given mixture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 43: Symposium M – Fly Ash and Coal Conversion By-Products I , 1984 , 85
Copyright
Copyright © Materials Research Society 1985

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