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On the structure of some precipitated calcium alumino-sulphate hydrates

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Abstract

The chemistry of the calcium alumino-sulphate hydrates has been reassessed using the methods developed in a previous paper [10]. Ettringite does not have a constant solubility product. The rise in the ionic activity product of solutions in equilibrium with “ettringite” as a function of pH and sulphate activity is attributed to disordering of the crystal structure. This is due to removal of aluminium from the calcium aluminate hydrate columns which form the framework of the ettringite structure. The columns are terminated by these defects and estimates of the expected column length under various conditions are made. Qualitative explanations of changes in the stability of “ettringite” with respect to calcium aluminate monosulphate hydrate and of the action of certain admixtures on Portland cement are made on this basis.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Technology, University of Surrey, Guildford, UK

    C. J. Hampsoim & J. E. Bailey

Authors
  1. C. J. Hampsoim
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  2. J. E. Bailey
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Hampsoim, C.J., Bailey, J.E. On the structure of some precipitated calcium alumino-sulphate hydrates. J Mater Sci 17, 3341–3346 (1982). https://doi.org/10.1007/BF01203504

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  • DOI: https://doi.org/10.1007/BF01203504

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