GYPSUM BINDER MODIFIED WITH A MINERAL ADDITIVE Russian patent published in 2022 - IPC C04B11/00 C04B11/26 C04B28/14 C04B111/20 

FIELD: building materials.

SUBSTANCE: invention relates to the field of building materials, namely, to compositions of a gypsum binder used in dry building mixes, gypsum solutions for producing items and structures applied in the construction of residential and public buildings. Gypsum binder modified with a mineral alumina additive contains, wt.%: gypsum plaster 55 to 85, mineral alumina additive — waste from the destruction of energy-saturated materials with a specific surface area of 4,700 to 5,000 cm²/g and the following chemical composition, wt.%: Al₂O₃ 93.84 to 97.5, Fe₂O₃ 1.22 to 4.88, SiO₂ 0.07 to 0.14, calcination losses 0.71 to 1.13, with the content of the following impurities: carbon black, Mg, Mn, Cu, Ca, Pb, Ni, Cr, Co, Cd, V, Mo oxides thousandths of a percent, 15 to 45.

EFFECT: reduced negative environment impact due to the use of waste, increase in the bending and compression strength of the gypsum binder.

1 cl, 2 tbl