METHOD FOR PRODUCTION OF COMPLEX PLASTICIZED ADDITIVE FOR CONCRETE MIXTURE Russian patent published in 1996 - IPC

FIELD: production of concrete mixture. SUBSTANCE: method involves evaporation of waste solution of coke production, its cooling and centrifugation. The latter process is carried out to remove sodium thiocyanate, it is followed by mixing with technical lignosulfonates at ratio sodium thiosulfate: sodium sulfate and said lignosulfonates (1-5):((0.5-1.0):(0.1-0.5) respectively. Then granulation and drying thus obtained granules is carried out. Mentioned above waste solution represents solution on the base of thiocyanate, sodium thiosulfate and sodium sulfate. Strength of concrete which contains 1-5 % of proposed additive is up to 31.5 MPa, its water absorption being 4.23 %. EFFECT: improves efficiency of method, improves quality of desired product. 1 tbl