MULTI-COMPONENT ADDITIVE FOR CONCRETE MIX AND BUILDING MORTAR AND METHOD FOR ADDITIVE PREPARATION Russian patent published in 2006 - IPC C04B24/16 C04B24/30 C04B103/30 

FIELD: building materials, particularly inorganic materials used as active ingredients for mortars, concrete or artificial stone.

SUBSTANCE: additive comprises mix of ballast coke oven gas desulfurization salt based on sodium thiosulfate and thiocyanate, as well as superplasticizing agent based on polynaphthalenesulfonate. The additive additionally has alkali component in amount necessary to provide pH equal to 8.1-10.8 of 1.0% aqueous additive solution. Mass ratio between ballast coke oven gas desulfurization salt and superplasticizing agent is 1 to 0.1-10.0. The additive also has caustic soda used as the alkali component. Above components are taken in the following amounts (% by weight): superplasticizing agent - 15.00-85.00, caustic soda - 0.02-0.25, ballast coke oven gas desulfurization salt - remainder. The additive may additionally have industrial lignosulphonates and in this case the additive components are taken in the following amounts (% by weight): superplasticizing agent - 15.00-85.00, caustic soda - 0.02-0.20, industrial lignosulphonates - 1.50-15.00 and ballast coke oven gas desulfurization salt - remainder. In the case of sodium nitride or formate usage the additive comprises superplasticizing agent (15.00-85.00% by weight), caustic soda (0.02-0.20% by weight), sodium nitride or sodium formate (5.00-42.50% by weight) and ballast coke oven gas desulfurization salt (remainder). Mass ratio between the main components of sodium thiosulfate and thiocyanate and superplasticizing agent, namely between sodium thiosulfate, sodium thiocyanate and polynaphthalenesulfonate is 1:1.6-2.4:3.0-12.0. Method of above mixture preparation involves metered supplying additive components into vessel; mixing the components in the vessel at 15-50°C temperature to obtain final aqueous solution of above additive having 1120-1320 kg/m³ density; forcedly mixing above components to prepare stable additive providing stable pH value of 1% aqueous solution of above additive; drying the obtained aqueous solution at 80-130°C temperature so that moisture content in dried additive is 2.0-9.5% by weight inclusive. The aqueous solutions are supplied under 25-50°C temperature to prepare aqueous additive solution having density of 1180-1280 kg/m³. The forced mixing of additive components is carried out with the use of circulation pump, wherein circulating factor is to be not less than 10. Total mixing time after alkali component supplying termination is not more than 0.5 hours.

EFFECT: increased property stability, which permit additive action on mortar and concrete mix after long-term storage.

8 cl, 6 tbl