BINDING AGENT AND METHOD OF ITS PREPARATION Russian patent published in 2008 - IPC C04B11/30 

FIELD: chemistry, construction.

SUBSTANCE: binding agent includes, wt %: semi-water gypsum of β-modification -57.3-62.9, grinded basic granular blast-furnace slag - 15.2-16.25, caustic magnesite - 10.8-16.25, clyite dust from cyclones - 0.45-0.9, bischofite solution with density 1.2 g/cm³ in terms of magnesium chloride MgCl₂ -9.75-10.2. Method of preparation of said binding agent includes mixing said gypsum, said slag and caustic magnesite, tempering of dry mixture with bischofite solution with density 1.2 g/cm³ and further introduction of said dust 1-2 min before formation.

EFFECT: increase of strength under compression, extension of stiffening terms, reduction of binding agent water resistance.

2 cl, 2 tbl