Abstract
The dehydration of a high alumina cement castable and its influence on physical and thermomechanical behaviour is studied for temperatures below 800°C. The hydrated cement paste is composed of non-hydrated constituents (CA, CA2 and C12A7) and two stable hydrates (AH3 and C3AH6). The decomposition of the hydrates is analysed by TGA–DTA and XRD analyses. The complex chemical reactions are modelled by several kinetic laws characterising the conversion rate of the initial and intermediate formed hydrates. The variation of porosity and shrinkage of the cement paste as well as the shrinkage of the castable due to dehydration are also measured. A model, including local information at different micro-scales (constituents of the cement paste and their physical properties, volume fraction of aggregates), is proposed for both the paste and the castable.
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