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Solubility Modelling of Cements: Implications for Radioactive Waste Immobilisation.

Published online by Cambridge University Press:  28 February 2011

F.P. Glasser ,
D.E. Macphee  and
E.E. Lachowski
F.P. Glasser
Affiliation:
University of Aberdeen, Department of Chemistry, Meston Walk, Old Aberdeen AB9 2UE, Scotland
D.E. Macphee
Affiliation:
University of Aberdeen, Department of Chemistry, Meston Walk, Old Aberdeen AB9 2UE, Scotland
E.E. Lachowski
Affiliation:
University of Aberdeen, Department of Chemistry, Meston Walk, Old Aberdeen AB9 2UE, Scotland
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Abstract

The suitability of cement matrices for the long-term immobilisation of radionuclides cannot be predicted from short-term experimental data alone, because the chemical properties of cementitious systems change continuously over the repository lifetime. To model such changes is complex, so a stepwise approach has been adopted. A chemically simplified model for the solubility and compositional properties of calcium silicate hydrate gels in the system CaO-SiO2 -H20 was previously developed but has now been extended and improved and is applicable to gels in the wider composition range 0.8 < Ca/Si < 1.7. The effects of silicate speciation in aqueous solution on the formation of the solid phase have been more fully considered and the dissolution equilibrium has been revised. Solubility products and free energies of C-S-H formation have been evaluated and predictive applications of the model are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 331
Copyright
Copyright © Materials Research Society 1987

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