Conclusions
It is shown that in specimens prepared from lime with additions of yttrium oxide, during firing at 1950°C, solid solutions are formed on the basis of CaO, contributing to an increase in the hydration resistance.
It is established that the specimens prepared from CaO with additions of manganese and chromium oxides, fired at 1750°C, also have a high hydration resistance.
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Translated from Ogneupory, No. 1, pp. 16–19, January, 1988.