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Quantitative Rietveld analysis of hydrated cementitious systems

Published online by Cambridge University Press:  01 March 2012

L. D. Mitchell ,
J. C. Margeson  and
P. S. Whitfield
L. D. Mitchell
Affiliation:
Institute for Research in Construction, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
J. C. Margeson
Affiliation:
Institute for Research in Construction, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada
P. S. Whitfield
Affiliation:
Institute for Chemical Process and Environmental Technology, National Research Council Canada, 1200 Montreal Road, Ottawa, Ontario KlA 0R6, Canada
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Abstract

A study examining the feasibility, and possible necessity, of using transmission data from capillary mounted samples for quantitative analysis of hydrated cement systems was conducted. In order to obtain true quantitative results, the amorphous contents were determined by the addition of an internal standard. The amorphous content of the starting tricalcium silicate was found to be approximately 21–22 wt %, in close agreement with previously published results. The study revealed that the spherical harmonics preferential orientation correction may not be reliable with unmicronized hydrated cement materials in reflection geometry, as chemically unreasonable progressions in Portlandite content with time were observed. The data obtained from capillary measurements, however, exhibited little or no preferential orientation, and appeared to produce the progression of phase contents expected from the reaction. The use of capillaries would appear to be justified in some circumstances to obtain reliable quantitative results from hydrated cementitious materials. In this particular system, a significant fraction of calcium carbonate was present as aragonite, as well as the more usual calcite.

Type
X-Ray Diffraction
Information
Powder Diffraction , Volume 21 , Issue 2 , June 2006 , pp. 111 - 113
Copyright
Copyright © Cambridge University Press 2006

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