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

Journal article


Publication Details

Author(s): Schreiner J, Götz-Neunhoeffer F, Neubauer J, Bergold S, Webler R, Volkmann S, Jansen D
Journal: Powder Diffraction
Publication year: 2019
ISSN: 0885-7156


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 SEMmicrographs 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.


FAU Authors / FAU Editors

Bergold, Sebastian
Lehrstuhl für Mineralogie
Götz-Neunhoeffer, Friedlinde Prof. Dr.
Lehrstuhl für Mineralogie
Jansen, Daniel Dr.
Lehrstuhl für Mineralogie
Neubauer, Jürgen apl. Prof. Dr.
Lehrstuhl für Mineralogie
Schreiner, Jürgen
Lehrstuhl für Mineralogie
Webler, Ralf
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


How to cite

APA:
Schreiner, J., Götz-Neunhoeffer, F., Neubauer, J., Bergold, S., Webler, R., Volkmann, S., & Jansen, D. (2019). Advanced Rietveld refinement and SEM analysis of tobermorite in chemically diverse autoclaved aerated concrete. Powder Diffraction. https://dx.doi.org/10.1017/S0885715619000149

MLA:
Schreiner, Jürgen, et al. "Advanced Rietveld refinement and SEM analysis of tobermorite in chemically diverse autoclaved aerated concrete." Powder Diffraction (2019).

BibTeX: 

Last updated on 2019-18-04 at 10:38