XRD, EDX and IR analysis of solid solutions between thaumasite and ettringite

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

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97 Citations (Scopus)

Abstract

Solid solutions between thaumasite and ettringite were prepared by methods analogous to those well established for the preparation of thaumasite and ettringite. The extent of immiscibility in this system is investigated by varying the Al:Si and SO42- :CO32- ratios in reactant mixtures. The solids produced were analysed by quantitative X-ray diffraction, with Rietveld refinement also providing accurate unit cell dimensions, energy-dispersive X-ray analysis and infrared spectroscopy. The compositional and unit cell variations in the solid solution are discussed. A wide variety of solid solution compositions were produced with both the thaumasite and ettringite structures, but all preparations were considerably diluted by secondary amorphous products. (C) 2002 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)719-730
Number of pages11
JournalCement and Concrete Research
Volume32
Issue number5
DOIs
Publication statusPublished - May 2002

Keywords

  • X-ray diffraction
  • EDX
  • infrared spectroscopy
  • thaumasite
  • ettringite
  • center-dot 26H(2)O
  • CA6AL2(SO4)(3)(OH)(12)CENTER-DOT-26H(2)O
  • 5-75-degrees-C
  • solubility
  • mortars

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