METHOD OF PREPARING CEMENT-BASED COMPLEX ADDITIVE FOR CONCRETE MIXTURE Russian patent published in 2013 - IPC C04B24/24 C04B103/60 

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of construction materials and can be used in preparing complex additives for making concrete and reinforced concrete articles and structures. The engineering problem of the invention is improving workability of concrete mixtures, increasing concrete strength (in the early stages and later stages of hardening), water impermeability and frost resistance. The problem is solved by that the plasticiser used is a powdered compound selected from: technical lignosulphonate, a superplasticiser based on a sodium salt of naphthalene sulphonic acid and C-3 formaldehyde, a mixture of said plasticisers in equal amounts, and liquid glass as a silica-containing component, wherein at the beginning, said powdered plasticiser is stirred in water until obtaining a solution with concentration of 35-40%, followed by addition of liquid glass in an amount which enables to obtain a ready complex additive with concentration of 60-70%. When using one of said plasticisers as aqueous solution, it is mixed with liquid glass until obtaining a ready complex additive with concentration of 60-70%.

EFFECT: complex additive can be prepared in any mixing equipment.

2 cl, 1 tbl