RAW MATERIAL MIXTURE FOR PROTECTIVE COATING Russian patent published in 2021 - IPC C04B28/04 C04B14/28 C04B41/50 

FIELD: building materials.

SUBSTANCE: invention relates to the field of building materials and can be used to protect the surfaces of concrete and reinforced concrete structures in civil and industrial construction. The raw mixture contains sand with a fraction of 0.315 mm, magnesia limestone with a specific surface area S_sp = 280 m²/kg, metakaolin based on kaolinite clays with a specific surface area S_sp = 1300 m²/kg, and a complex additive consisting of microsilica with a specific surface area S_sp = 2000 m²/kg, dry polycarboxylate polymer based on methacrylic acid with bulk density D = 0.520 g/cm³, pH value pH = 6.0 and potassium formiate with the following ratio of components, wt.%: the specified microsilica 87.0-87.5; the specified polycarboxylate polymer 4.1-4.3; potassium formate 8.4-8.7, with the following ratio of the components of the raw mixture, wt. %: Portland cement 44.5-46.3; the specified sand 26.9-27.4; the specified limestone 6.4-6.8; the specified metakaolin 1.6-1.80; the specified complex additive 4.8-5.1; water 14.0-14.4.

EFFECT: increase in the adhesion strength to the surface of the concrete base and increasing the corrosion resistance of the protective coating against magnesia corrosion.

1 cl, 1 tbl