FIELD: chemistry.
SUBSTANCE: invention relates to compositions of mortar, concrete or artificial stone and can be used in making decorative and structural gypsum articles, e.g. wall panels, bricks, tongue-and-groove boards etc. Crude mixture for producing gypsum materials contains hemihydrate gypsum, high-calcium flue ash, aluminium sulphate and water, with the following ratio of components, wt.%: hemihydrate gypsum 49.16-66.60, aluminium sulphate 0.003-0.060, high-calcium flue ash 15.38-33.33, water – balance.
EFFECT: high strength of material made from the crude mixture for making gypsum material.
1 cl, 1 tbl, 5 ex
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