METHOD FOR OBTAINING THE ACID RESISTANT BINDER Russian patent published in 2018 - IPC C04B7/13 C04B14/14 C04B12/04 C04B22/08 C04B111/23 

FIELD: construction.

SUBSTANCE: invention relates to the building materials industry and can be used in the manufacture of acid-resistant concrete and mortar based on the unfired binder. First kaolinite clay is activated to the specific surface of 640 m²/kg and is subjected to firing at the temperature of 600–650 °C, the resulting metakaolin is mixed with the volcanic tuff of the specific surface of 520 m²/kg, which is followed by addition of sodium silicofluoride Na₂SiF₆, sodium hydroxide NaOH, liquid glass Na₂SiO₃ and hydrophobizing liquid HSF-11 at the following ratio of components, WT%: metakaolin 25.6–61.2, volcanic tuff 21.4–51.2, liquid glass Na₂SiO₃ 11.0–13.0, sodium hydroxide NaOH 0.6–1.0, sodium silicofluoride Na₂SiF₆ 5–8, hydrophobizing silicone fluid HSF-11 0.8–1.2.

EFFECT: increased efficiency of obtaining acid-resistant binder with improved physical-mechanical and operational properties.

1 cl, 1 tbl