RAW MIXTURE FOR PROTECTIVE COATING Russian patent published in 2023 - IPC C04B41/50 C04B28/04 C04B28/06 C04B24/24 

FIELD: building materials.

SUBSTANCE: invention can be used for the repair, restoration and subsequent protection of concrete and reinforced concrete structures in industrial and civil engineering. Raw mix for protective coating contains, wt.%: Portland cement 37.0-39.0; sand 27.64-28.14; complex additive 2.60-2.68; microcalcite with a particle size of 100 microns 6.52-6.72; aluminous cement 3.30-3.36; blast-furnace slag with a specific surface area S_sp=500 m²/kg 4.96-5.04; calcium formate 1.05-1.09; water 14.93-15.97. As sand, quartz sand of a fraction of 0.16-0.30 mm is used with a bulk density D=2.7 g/cm³, compressive strength = 260 MPa, Mohs hardness = 7. As a complex additive, a dry complex chemical additive with bulk density D=0.510, pH value pH=7.6 is used, consisting of a polycarboxylate polymer based on methacrylic acid with bulk density D=0.540 g/cm³, pH value pH=6.4; a redispersible powder based on a copolymer of butyl acrylate and styrene with a bulk density D=0.500 g/cm³, pH value pH=8.0, with the following additive component ratio, wt.%: said polycarboxylate polymer 4.76-5.46; said redispersible powder 94.54-95.24.

EFFECT: increased adhesive strength of the protective coating to the concrete base, increased water resistance of the protective coating and increased tensile strength in bending of the protective coating.

1 cl, 2 tbl