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Cements in radioactive waste disposal: some mineralogical considerations

Published online by Cambridge University Press:  05 July 2018

C. E. McCulloch ,
M. J. Angus ,
R. W. Crawford ,
A. A. Rahman  and
F. P. Glasser
C. E. McCulloch
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
M. J. Angus
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
R. W. Crawford
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
A. A. Rahman
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
F. P. Glasser
Affiliation:
Department of Chemistry, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
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Abstract

Cementitious matrices are being assessed for immobilization of radioactive wastes. This paper discusses some mineralogical aspects of cement chemistry and the uses of siliceous minerals as selective sorbants to enhance immobilization potential.

Studies of sorption and leaching of caesium from pulverized fuel ash (PFA), blast furnace slag, tobermorite, xonotlite, and clinoptilolite are reported. The role of incorporation of these additives in cement and the effect on the nature of the composite matrix on caesium behaviour has been investigated. Specific mechanisms of the interaction of additives with highly alkaline cement environment are described. While slags, PFA, and clinoptilolite undergo reaction at different rates, tobermorite and xonotlite appear to be stable in cement.

Keywords

radioactive wastecementcaesiumashslagtobermoritexonotliteclinoptilolite
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 351 , April 1985 , pp. 211 - 221
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985

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