FIELD: construction.
SUBSTANCE: invention pertains to the industry of making construction materials and can be used in making gypsum concrete products. The crude mixture for making gypsum concrete contains the following components in mass.%: gypsum binding material - 30.5-31.7, wastes from sawing volcanic tuff - tuff sand 30.5-31.7, burnt lime - 7.9-10.6, water constitutes the remaining part.
EFFECT: reduction of specific consumption of gypsum without reduction in strength and retardation.
2 tbl
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