FIELD: construction.
SUBSTANCE: raw mix for obtaining of gypsum materials includes semi-water gypsum, water and complex reinforcing additive consisting of aluminium sulphate and calcium hydroxide at the following ratio of components, wt %: semi-water gypsum 62.400-62.450, aluminium sulphate 0.0280-0.1123, calcium hydroxide 0.046-0.047, water - the rest.
EFFECT: increase of strength of gypsum stone at simplification of technology.
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