METHOD OF PREPARATION OF CONCRETE COMPLEX MODIFIED AND CONCRETE COMPLEX MODIFIER(VERSIONS) Russian patent published in 2000 - IPC

FIELD: methods of preparation of concrete complex modifier and compositions of complex modifier. SUBSTANCE: method includes mixing of dispersed mineral component containing silicon dioxide at least, 50.7 wt.% with chemical additive and subsequent drying and granulation of obtained mixture in gas-air flow. Dispersed mineral component is used in form of products of dry gas cleaning of furnaces smelting crystalline silicon, and/or ferrosilicon, and/or ferrosiliconchrome, or silicocalcium, and/or fly ash of furnaces burning bituminous coals, and/or kaolin, and/or rock. Chemical additive is used in form of plasticizer based on salt of polyindensate of beta-naphthalene sulfonic acid and formaldehyde, and/or its mixture with nitrilotrimethylphosphonic acid, and/or with oxyethylenediphosphonic acid, and/or with disodium salt of ethylenediaminetetraacetic acid, and/or plasticizer based on lignosulfonate. Gas-air flow consists of combustion products of natural gas, and/or gases effluent from furnaces smelting silicon-containing alloys or burning bituminous coals and containing solid particles in amount of not in ecess 2.5 g/n.cu.m. Obtained complex modifiers has components in the following amounts, wt.%: dispersed mineral component containing silicon dioxide 51.9-94.1; chemical additive 4.7-45.5; the balance, water. EFFECT: reduced production process (particularly, suspension drying operation), higher plasticizing capacity of modifier, increased strength of concrete produced on base of offered modifier. 7 cl, 3 tbl, 1 ex