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Technical Note on the Determination of Free Lime (CaO) in Fly Ash

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

Many fly ashes contain free lime (CaO) and periclase (MgO) [1,2]. These two compounds, when present in excessive amounts, are known to cause soundness problems in portland cement [3,4]. Recent work [5] has indicated that the autoclave expansion of portland cement-fly ash pastes is related to the concentration of CaO and MgO in a given paste, free lime typically being more detrimental than periclase. The purpose of this technical note is to briefly discuss two methods that are currently available for determining the free lime content of fly ash, and to suggest a supplement to the autoclave test (described in ASTM C 151). The major drawback of the autoclave test is that it requires approximately two days to complete and therefore it would be helpful to have a quick chemical test that could be used to indicate the soundness properties of a given fly ash.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 43: Symposium M – Fly Ash and Coal Conversion By-Products I , 1984 , 51
Copyright
Copyright © Materials Research Society 1985

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References

1. Mings, M. L., Schlorholtz, S., Pitt, J. M., and Demirel, T., Transportation Research Record 941, 5–11 (1983).Google Scholar
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