METHOD TO PREPARE GYPSUM CEMENT POZZOLAN COMPOSITION Russian patent published in 2015 - IPC C04B40/00 C04B24/00 C04B28/00 

FIELD: construction.

SUBSTANCE: method to produce a gypsum cement pozzolan binder includes hydraulic activation of portland cement with surfactants for 1 minute with subsequent addition of gypsum and pozzolan component and repeated hydraulic activation for 2 minutes in a rotor-pulsation device with speed of shaft rotation of at least 5000 rpm, surfactants are a mixture of aqueous solution of carboxylate polyester "Glenium Ace® 430", a controller of setting and hardening times "BEST-TB" and a homogeneous mix of oligoethoxysiloxanes "Ethyl silicate -40" at the ratio of 1:0.17:0.07, he pozzolan component is metakaolin with hydraulic activity of at least 1000 mg/g at the following ratio of components, wt %: calcined gypsum 56.7-57.4, portland cement 14.6-15.4, specified surfactant 1-1.8, metakaolin 2.7-3.3, water - balance.

EFFECT: increased frost resistance, longer times of composition setting, giving it self-compacting property, increased strength, higher water resistance and reduced water absorption.

2 tbl