METHOD OF PREPARING CONCRETE MIX Russian patent published in 2000 - IPC

FIELD: preparation of concrete mixes for prefabricated and monolithic products and structures. SUBSTANCE: method comprises stirring fillers with 70-80% of mixing water, adding nitrate- nitrite-alkaline water in amount of 2.5% based on weight of cement (said water is catalyst production waste and contains, wt %: sodium nitrate 26-30; sodium nitrite, 6- 8; caustic soda, 3-5; and water, up to 100, the balance), subsequently adding cement and stirring all components for another 1 minute. EFFECT: increased placability and greater tensile strength of concrete mix. 1 tbl