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Advanced Rietveld refinement and SEM analysis of tobermorite in chemically diverse autoclaved aerated concrete

Published online by Cambridge University Press:  11 March 2019

J. Schreiner ,
F. Goetz-Neunhoeffer ,
J. Neubauer ,
S. Volkmann ,
S. Bergold ,
R. Webler  and
D. Jansen
J. Schreiner*
Affiliation:
University of Erlangen-Nuremberg, GeoZentrum Nordbayern, Mineralogy, Schlossgarten 5a, 91054 Erlangen, Germany
F. Goetz-Neunhoeffer
Affiliation:
University of Erlangen-Nuremberg, GeoZentrum Nordbayern, Mineralogy, Schlossgarten 5a, 91054 Erlangen, Germany
J. Neubauer
Affiliation:
University of Erlangen-Nuremberg, GeoZentrum Nordbayern, Mineralogy, Schlossgarten 5a, 91054 Erlangen, Germany
S. Volkmann
Affiliation:
Rodgauer Baustoffwerke GmbH & Co. KG, Am Opel-Prüffeld 3, 63110 Rodgau-Dudenhofen, Germany
S. Bergold
Affiliation:
Schlenk Metallic Pigments GmbH, Barnsdorfer Hauptstr. 5, 91154 Roth, Germany
R. Webler
Affiliation:
Schlenk Metallic Pigments GmbH, Barnsdorfer Hauptstr. 5, 91154 Roth, Germany
D. Jansen
Affiliation:
University of Erlangen-Nuremberg, GeoZentrum Nordbayern, Mineralogy, Schlossgarten 5a, 91054 Erlangen, Germany
*
a)Author to whom correspondence should be addressed. Electronic mail: juergen.js.schreiner@fau.de; daniel.jansen@fau.de
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Abstract

Changes of structural properties of tobermorite in autoclaved aerated concrete (AAC) for various compositions were characterized and the disadvantages of SEM analysis in this context are discussed. The influence of variations in the chemical composition of raw materials on lattice parameters, morphology and domain sizes of tobermorite was investigated by XRD and for comparison by SEM analysis. Particularly the effect of substitution by Al3+ and (SO4)2− in tobermorite structure was examined. The dimensions of coherently scattering domains were calculated based on the refinement of anisotropic peak broadening of tobermorite in XRD diffractograms using a Rietveld compatible approach. No effect of (SO4)2− on the domain sizes and lattice parameters of tobermorite could be observed. The amount of anhydrite detected by quantitative XRD analysis indicates that all of the available (SO4)2− is present as anhydrite. Lath-like shapes of domains and a larger c parameter are calculated whenever Al3+ is incorporated in a considerable amount. Formation of katoite can be observed very clearly in SEM micrographs whenever the amount of available Al3+ exceeds a distinct value in the dry mix. The effect of Al3+ and (SO4)2− on tobermorite morphology could not be observed clearly by SEM analysis in AAC samples.

Keywords

tobermoriteautoclaved aerated concreteRietveld refinementdomain sizesSEM analysis
Type
Technical Article
Information
Powder Diffraction , Volume 34 , Issue 2 , June 2019 , pp. 143 - 150
Copyright
Copyright © International Centre for Diffraction Data 2019 

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