ADDITIVE FOR CONCRETES AND MORTARS AND METHOD OF PRODUCTION OF SUCH ADDITIVE Russian patent published in 2008 - IPC C04B28/02 C04B22/08 C04B24/18 C04B103/14 C04B103/30 C04B103/50 

FIELD: manufacture of building materials; preparation of concrete and mortars used for manufacture of concrete and reinforced concrete precast and monolithic articles; oil producing industry for manufacture of plugging and insulating materials based on mineral binders.

SUBSTANCE: proposed additive for concrete and mortars includes lignosulfonates, nitrate-containing component and neutralizing agent; used as nitrate-containing component is calcium nitrate; used as neutralizing agent is potassium hydroxide; additive includes additionally foam suppressor and biocide at the following ratio of components, mass-%: (dry substance) lignosulfonates, 80-91; calcium nitrate, 8-15; foam suppressor, 0.2-0.4; biocide, 0.1-0.3; the remainder being potassium hydroxide. Method of production of such additive includes preparation of 10-35-% calcium solution in water heated to temperature of 60-65 C followed by cooling of this solution to temperature of 35-45 C and successive introduction of foam suppressor, biocide, lignosulfonates and potassium hydroxide into it for obtaining the solution at density of 1.16-1.17 kg/m³ at pH= 8.4-9. This additive may be obtained in powder-like state by drying the solution to moisture content of W=4-5%.

EFFECT: enhanced strength of concrete and mortars at early periods of hardening at retained corrosion resistance.

3 cl, 2 tbl