RAW MIX FOR PRODUCTION OF MODIFIED GYPSUM COMPOSITE MATERIALS Russian patent published in 2015 - IPC C04B28/14 

FIELD: construction.

SUBSTANCE: raw mix for production of gypsum products includes ground by-product calcium sulphate dihydrate in the form of spent moulds of porcelain production, as lime and water - a saturated solution of slaked lime, and by-product calcium sulphate dihydrate is a binary mixture of powders with specific surfaces of 200-300 m²/kg and 800-900 m²/kg, additionally it contains a complex modifier additive as microcalcite with specific surface of 2100-2200 m²/kg, polycarboxylate and slag Portland cement at the following ratio of components, wt %: by-product calcium sulphate dihydrate with specific surface of 200-300 m²/kg - 17.5-18.9, by-product calcium sulphate dihydrate with specific surface of 800-900 m²/kg - 52.3-56.7, microcalcite with specific surface of 2100-2200 m²/kg - 3.8-10.5, polycarboxylate - 3.5-3.8, slag Portland cement - 6.2-6.8, slaked lime - 0.027-0.035, water - balance.

EFFECT: increased strength and water resistance of a composite material, reduced energy costs during its production.