ULTRA-LIGHT MINERAL FOAM MATERIAL Russian patent published in 2020 - IPC C04B38/10 C04B22/08 C04B40/02 C04B111/20 

FIELD: construction.

SUBSTANCE: group of inventions relates to an ultra-light mineral foam based on portland cement, in particular to a method of producing mineral foam material and use of a source of magnesium salt to increase mechanical stability or reduce destruction of foamed cement suspension. Method of producing mineral foam material involves the following steps: (i) separate preparation of cement slurry and aqueous foam, wherein cementitious solution includes water (W) and portland cement (C); (ii) contacting the cement slurry with the aqueous foam to obtain a foam cement slurry; (iii) adding a magnesium salt source as a setting accelerator during or after step (ii); (iv) cast foamed cement suspension and holding it for setting, wherein mineral foam material substantially does not contain particles with diameter D50<2 mcm, and magnesium chloride source (MgCl₂) is used as source of magnesium salt, in particular in form of magnesium chloride solution, and/or magnesium sulphate (MgSO₄), in particular in form of a solution of magnesium sulphate, and/or magnesium nitrate (Mg(NO₃)₂), in particular in form of a solution of magnesium nitrate. Group of inventions is developed in dependent claims.

EFFECT: technical result is production of mineral foam material, which is not destroyed during vertical casting, having low density and heat conductivity.

11 cl, 1 ex, 3 tbl