Solubility properties of ternary and quaternary compounds in the CaO Al2O3 SO3H2O system

M. Atkins*, D. Macphee, A. Kindness, F. P. Glasser

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


Solubility measurements are reported for four hydrated cement phases. A technique employing repeated dispersion and filtration is described which enabled the solubility (activity) products of ettringite (C6AS3H32) and hydrogarnet (C3AH6) to be calculated with confidence. Free energies of formation are also given. These phases dissolve congruently, whereas monosulphate (C4ASH2) and tetra-calcium aluminate hydrate (C4AH13) exhibit incongruent dissolution, and can therefore not be described by a conventional solubility product. The results represent additional data for inclusion in thermodynamic databases currently being applied to the modelling of cement systems.

Original languageEnglish
Pages (from-to)991-998
Number of pages8
JournalCement and Concrete Research
Issue number6
Publication statusPublished - 1 Jan 1991

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