Discrimination of bassanite and anhydrite III dehydrated from gypsum at different temperatures

Journal article


Publication Details

Author(s): Seufert S, Hesse C, Götz-Neunhoeffer F, Neubauer J
Journal: Zeitschrift für Kristallographie, Supplement
Publisher: R. Oldenbourg
Publication year: 2009
Volume: Suppl. 30
Pages range: 447-452
ISSN: 0930-486X
Language: English


Abstract


Technical OPC normally contains mixed sulphate carriers in varying amounts. Gypsum (calcium sulphate dihydrate, CaSO 4 ·2 H 2O) is added to the clinker before the milling process and dehydrates partially to bassanite (calcium sulphate hemihydrate, CaSO 4 ·0.5 H 2O) and anhydrite (CaSO 4). The dehydration temperature and humidity affects the resulting calcium sulphates. Anhydrite exists in different polymorphs (anhydrite I-III) of which anhydrite III shows the highest reactivity in contact with H 2O. Due to different kinetics of the calcium sulphate phases, which strongly influence hydration, it is very important to be able to characterize the sulphate carrier composition in the cement and in applications with high sulphate content. This study could prove that it is possible to quantify bassanite and anhydrite III in samples of dehydrated gypsum by Rietveld refinement of XRD data especially in mixtures consisting of more than one calcium sulphate modification. © by Oldenbourg Wissenschaftsverlag, München.



FAU Authors / FAU Editors

Götz-Neunhoeffer, Friedlinde Prof. Dr.
Lehrstuhl für Mineralogie
Neubauer, Jürgen apl. Prof. Dr.
Lehrstuhl für Mineralogie


How to cite

APA:
Seufert, S., Hesse, C., Götz-Neunhoeffer, F., & Neubauer, J. (2009). Discrimination of bassanite and anhydrite III dehydrated from gypsum at different temperatures. Zeitschrift für Kristallographie, Supplement, Suppl. 30, 447-452. https://dx.doi.org/10.1524/zksu.2009.0066

MLA:
Seufert, Sebastian, et al. "Discrimination of bassanite and anhydrite III dehydrated from gypsum at different temperatures." Zeitschrift für Kristallographie, Supplement Suppl. 30 (2009): 447-452.

BibTeX: 

Last updated on 2018-20-12 at 16:24