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Polymorphism of tricalcium silicate in Portland cement: A fast visual identification of structure and superstructure

Published online by Cambridge University Press:  05 March 2012

M. Courtial,
M.-N. de Noirfontaine,
F. Dunstetter,
G. Gasecki and
M. Signes-Frehel
M. Courtial
Affiliation:
Laboratoire d’Artois Me´canique et Habitat, Universite´ d’Artois, route de l’Universite´ 62408 Be´thune, France
M.-N. de Noirfontaine
Affiliation:
Laboratoire des Solides Irradie´s, Ecole Polytechnique, 91128 Palaiseau Cedex, France, CTG, Ciments CALCIA–Italcementi Group, rue des Technodes, 78931 Guerville Cedex, France
F. Dunstetter
Affiliation:
Laboratoire des Solides Irradie´s, Ecole Polytechnique, 91128 Palaiseau Cedex, France
G. Gasecki
Affiliation:
CTG, Ciments CALCIA–Italcementi Group, rue des Technodes, 78931 Guerville Cedex, France
M. Signes-Frehel
Affiliation:
CTG, Ciments CALCIA–Italcementi Group, rue des Technodes, 78931 Guerville Cedex, France
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Abstract

So-called alite is a solid solution of tricalcium silicate Ca3SiO5 with a few percent of impurities. It constitutes the major phase of anhydrous Portland cement. In industrial compounds, alite crystallizes into two monoclinic forms designated M1 and M3. The possibility of correlation between the crystallographic structure of the clinker and its reactivity is still an open question. The answer of such a question involves a proper quantitative analysis of the various phases—including the exact alite polymorph—of the industrial product. The rather similar structure of the two alites makes it difficult to distinguish them from their XRD patterns. This paper shows that five angular windows in the X-ray diffraction patterns can be used with synthetic alites as well as industrial compounds, to identify the nature of the actual polymorph (M1 or M3) present and the structural model to be used (with or without superstructure) in subsequent Rietveld analysis of the data.

Keywords

anhydrous cementpolymorphismsuperstructureX-ray powder diffraction

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Type
Technical Articles
Information
Powder Diffraction , Volume 18 , Issue 1 , March 2003, pp. 7 - 15
Copyright
Copyright © Cambridge University Press 2003

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