The influence of high temperatures on the ternary gypsum materials with microsilica is described in the paper. The ternary samples, prepared from gypsum, lime and microsilica and samples without pozzolan admixture were exposed to temperatures from 50 °C to 1000 °C and their mechanical properties were investigated. The visual comparison and the comparison of mechanical properties of ternary samples and samples without microsilica were carried out. The mixtures with microsilica resisted better to the high temperatures than the samples without microsilica, although the resistance of both materials against the high temperature was not very good.
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