Extent of immiscibility in the ettringite-thaumasite system

S. J. Barnett, Donald E MacPhee, N. J. Crammond

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23 Citations (Scopus)

Abstract

Solid solutions between thaumasite and the related phase ettringite were prepared and characterised by X-ray diffraction and infrared spectroscopy. A miscibility gap in the solid solution is identified and defined. Crystallographically, the miscibility gap is identified as a gap in the unit cell dimensions of the solid phases formed between c congruent to 20.95 (10.475) and c congruent to 21.3 Angstrom. A combination of quantitative X-ray powder diffraction and infrared spectroscopy enabled us to define the miscibility gap in terms of Al:Si ratio. Ettringite can accept the replacement of 1/2 its Al by Si, while thaumasite tolerates little or no At in its structure. (C) 2003 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)851-855
Number of pages4
JournalCement & Concrete Composites
Volume25
Issue number8
Early online date19 Sep 2003
DOIs
Publication statusPublished - Dec 2003

Keywords

  • thaumasite
  • ettringite
  • solid solution
  • center-dot 26H(2)O
  • crystal structure
  • solid-solutions
  • 5-75-degrees-C
  • solubility

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