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The article describes behavior of ternary gypsum-based composites, especially the changes of properties caused by the influence of moisture. The ternary mortars are composed from gypsum, hydraulic lime, different types of pozzolan and standard sand. Pozzolans in the mixture react with hydraulic lime and form CSH and CAH phases. Presence of these phases improves resistance of gypsum against the moisture. The way of samples storage affects the development of materials structure and properties of gypsum-based mortars...