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Phase Analysis of Portland Cement by Full Profile Standardless Quantitative X-Ray Diffraction - Accuracy and Precision

Published online by Cambridge University Press:  06 March 2019

J.C. Taylor  and
L.P. Aldridge
J.C. Taylor
Affiliation:
CSIRO Division of Coal and Energy Technology Lucas Heights Research Laboratories PMB 7, Menai, NSW, 2234, Australia
L.P. Aldridge
Affiliation:
Australian Nuclear Science and Technology Organisation Lucas Heights Research Laboratories PMB 1, Menai, NSW, 2234, Australia
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Abstract

The multiphase Rietveld method has been used in the determination of phase abundance in six standard Portland cements, using the SIROQUANT personal computer software package for XRD quantitative analysis. Because of the extreme amount of line superposition and weakness of the cement patterns care must be taken in the selection of standard XRD profiles and in the refinement of unit cell dimensions and linewidths. Comparison with round-robin microscope assays of the same cements shows r.m.s. deviations of assays between the two methods of 2.1% for alite, 3.1% for belite, 1.7% for aluminate and 1.3% for ferrite. Precision, studied by repeated SIROQUANT analyses of nine XRD patterns from the same Australian cement show esd's of 1.3% for the alite assay, 0.8% for belite, 0.5% for aluminate and 0.5% for ferrite.

Type
VI. Whole Pattern Fitting, Phase Analysis by Diffraction Methods
Information
Advances in X-Ray Analysis , Volume 36: Forty-First Annual Conference on Applications of X-ray Analysis, August 3-7, 1992 , 1992 , pp. 309 - 314
Copyright
Copyright © International Centre for Diffraction Data 1992

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