Hydration of calcium aluminates at 60°C – Development paths of C2AHx in dependence on the content of free water

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Hüller F, Neubauer J, Kaessner S, Götz-Neunhoeffer F
Zeitschrift: Journal of the American Ceramic Society
Jahr der Veröffentlichung: 2019
ISSN: 0002-7820
Sprache: Englisch


Abstract

The influence of water loss during the hydration of calcium aluminates on the phase development is investigated at 60°C. This is relevant for applications in which calcium aluminate cement (CAC) based formulations are exposed to quick drying during hydration. The presented results provide new insights into the well-known conversion processes occurring in CAC pastes. Using in situ XRD two different routes of the development of initially formed C2AH8 are determined: (a) transformation to C3AH6 + AH3 in the presence of sufficient free water and (b) dehydration to C2AH5 at a lack of free water. Moreover, the influence of precuring of the pastes at 23°C before heating to 60°C is investigated. The increasing loss of free water with increasing precuring time resulting from both, precipitation of hydrate phases and evaporation, causes incomplete hydration of CA or CA2 as well as dehydration of C2AH8 instead of conversion into C3AH6. Comparative investigations of sealed samples always revealed complete hydration of CA and CA2 as well as complete conversion of C2AH8.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Götz-Neunhoeffer, Friedlinde Prof. Dr.
Lehrstuhl für Mineralogie
Hüller, Florian
Naturwissenschaftliche Fakultät
Neubauer, Jürgen apl. Prof. Dr.
Lehrstuhl für Mineralogie


Einrichtungen weiterer Autorinnen und Autoren

Eberhard Karls Universität Tübingen


Zitierweisen

APA:
Hüller, F., Neubauer, J., Kaessner, S., & Götz-Neunhoeffer, F. (2019). Hydration of calcium aluminates at 60°C – Development paths of C2AHx in dependence on the content of free water. Journal of the American Ceramic Society. https://dx.doi.org/10.1111/jace.16314

MLA:
Hüller, Florian, et al. "Hydration of calcium aluminates at 60°C – Development paths of C2AHx in dependence on the content of free water." Journal of the American Ceramic Society (2019).

BibTeX: 

Zuletzt aktualisiert 2019-03-06 um 14:50