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

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 SO 4 2−:CO 3 2− ratios in reactant mixtures. The solids...

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Bibliographic Details
Published in:Cement and concrete research 2002-05, Vol.32 (5), p.719-730
Main Authors: Barnett, S.J, Macphee, D.E, Lachowski, E.E, Crammond, N.J
Format: Article
Language:English
Subjects:
Analysis of cement phases and constituents
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
EDX
Ettringite
Exact sciences and technology
Infrared spectroscopy
Materials
Properties of anhydrous and hydrated cement, test methods
Thaumasite
X-ray diffraction
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Summary: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 SO 4 2−:CO 3 2− 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.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(01)00750-5