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Quantitative in situ X-ray diffraction analysis of early hydration of Portland cement at defined temperatures

Published online by Cambridge University Press:  29 February 2012

C. Hesse ,
F. Goetz-Neunhoeffer ,
J. Neubauer ,
M. Braeu  and
P. Gaeberlein
C. Hesse
Affiliation:
Mineralogy, University of Erlangen-Nuremberg, D-91054 Erlangen, Germany
F. Goetz-Neunhoeffer
Affiliation:
Mineralogy, University of Erlangen-Nuremberg, D-91054 Erlangen, Germany
J. Neubauer
Affiliation:
Mineralogy, University of Erlangen-Nuremberg, D-91054 Erlangen, Germany
M. Braeu
Affiliation:
BASF Construction Chemicals GmbH, D-83308 Trostberg, Germany
P. Gaeberlein
Affiliation:
BASF Construction Chemicals GmbH, D-83308 Trostberg, Germany
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Abstract

Investigation into the early hydration of Portland cement was performed by in situ X-ray diffraction (XRD). Technical white cement was used for the XRD analysis on a D5000 diffractometer (Siemens). All diffraction patterns of the in situ measurement which were recorded up to 22 h of hydration at defined temperatures were analyzed by Rietveld refinement. The resulting phase composition was transformed with respect to free water and C-S-H leading to the total composition of the cement paste. The hydration reactions can be observed by dissolution of clinker phases as well as by the formation of the hydrate phases ettringite and portlandite. With increasing temperatures the reactions proceed faster. The formation of ettringite is directly influenced by the rate of dissolution of anhydrite and tricalcium aluminate (C3A). The beginning of the main period of hydration is marked by the start of portlandite formation. The experiments point out that a quantitative phase analysis of the cement hydration is feasible with standard laboratory diffractometers.

Keywords

in situ XRDcementhydrationRietveld analysis
Type
X-Ray Diffraction
Information
Powder Diffraction , Volume 24 , Special Issue 2 , June 2009 , pp. 112 - 115
Copyright
Copyright © Cambridge University Press 2009

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