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

Hüller F, Neubauer J, Kaessner S, Götz-Neunhoeffer F (2019)

Publication Language: English

Publication Type: Journal article

Publication year: 2019

Journal

Journal of the American Ceramic Society Wiley-Blackwell

DOI: 10.1111/jace.16314

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.

Authors with CRIS profile

Florian Hüller Naturwissenschaftliche Fakultät Jürgen Neubauer Lehrstuhl für Mineralogie Friedlinde Götz-Neunhoeffer Lehrstuhl für Mineralogie

Related research project(s)

Micostructural development in refractory castables - Influence of phase changes (Microstruc) Jan. 1, 2019 - Dec. 31, 2022

Involved external institutions

Eberhard Karls Universität Tübingen DE Germany (DE)

How to cite

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).

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