Abstract
The effects of temperature and restraint upon the hydration and the expansion of C 4 A SH 12 − 2 C S mixture compacts in different contact solutions have been investigated. Temperatures above 20°C do apparently hinder the formation of an impervious felt-like layer of ettringite around the C 4 A SH 12 particles, thus greatly reducing the retarding effect of the lime. An uniaxial restraint of 1 Kg/cm 2 is enough to reduce sensibly the expansions which remain however high (about 100%). The results can be satisfactorily interpreted by the reaction and expansion mechanism hypothesized in our previous papers.
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