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Reactivity of Gypsum-Based Materials Subjected to Thermal Load: Investigation of Reaction Mechanisms

Krause, Felix; Renner, Bernhard; Coppens, Frederik; Dewanckele, Jan; Schwotzer, Matthias

Abstract (englisch):
The thermal stability of gypsum-based materials, and in this context, especially their long-term behavior, is the background of our current research activities. A comprehensive investigation program was compiled in which detailed examinations of various model materials exposed to thermal loads were carried out. The understanding of the partly not entirely consistent state of knowledge shall be sharpened especially by in situ observations of the thermally induced conversion reaction of gypsum into hemihydrate. The temporal course of the reaction was investigated non-destructively by in situ investigations in a high-resolution X-ray computed tomography setup, and the experiment was accompanied by detailed characterizations of the microstructure and composition. In this contribution, selected results of experiments with a high-purity natural gypsum rock as the model substance are presented. Studying the influence of temperature on the reaction showed that, even under supposedly dry conditions, the reaction could take place at much lower temperatures than usually reported in the literature. It was demonstrated that the transformation of gypsum into hemihydrate could take place at a temperature of already 50 °C. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000117843
Veröffentlicht am 19.05.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 20.03.2020
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000117843
HGF-Programm 34.15.01 (POF III, LK 01)
Mineralische Konstruktionsmaterialien
Erschienen in Materials
Band 13
Heft 6
Seiten 1427
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter gypsum; hemihydrate; reaction mechanism; dynamic micro-CT; thermal stress; in situ experiment
Nachgewiesen in Scopus
Web of Science
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