Solubility Modelling of Cements: Implications for Radioactive Waste Immobilisation

Fredrik Paul Glasser*, Donald E Macphee, Eric Lachowski

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

19 Citations (Scopus)


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-SiO//2-H//2O was previously developed but has been extended and improved and is applicable to gels in the wider composition range 0. 8 less than Ca/Si less than 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.

Original languageEnglish
Title of host publicationMaterials Research Society Symposia Proceedings
EditorsJohn K. Bates, Waldemar B. Seefeldt
PublisherMaterials Research Soc
Number of pages11
ISBN (Print)0931837499
Publication statusPublished - 1987


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