GRANULATED COMPOSITE FILLER BASED ON DIATOMITE FOR CONCRETE MIXTURE AND CONCRETE BUILDING PRODUCT Russian patent published in 2014 - IPC C04B20/00 C04B28/04 C04B111/27 

FIELD: construction.

SUBSTANCE: granulated composite filler for concrete products of size 0.5-10.0 mm, consisting of core and shell, wherein the core is obtained by granulating the mixture together with diatomite and sodium hydroxide milled up to the specific surface area of 150-250 m²/kg at their weight ratio of 0.70-0.95:0.05-0.30 with bond by aqueous solution of sodium silicate with density of 1.2-1.3 g/cm³ in the amount of 0.1-7.0 wt % of mixture, and shell is formed on the surface of core by its balling with dry dust mixture together with milled quicklime and silicofluoride sodium in a weight ratio of 0.85-0.95:0.05-0.15 with the subsequent hardening up to the strength not less than 0.12 MPa, after the indicated balling the additional spraying of 40% aqueous solution of oxalic aldehyde in the amount of 1.0-8.0 wt % (per 100% substance) of weight of shell components is carried out. Concrete building product is obtained by using the granulated filler indicated above.

EFFECT: decrease of thermal conductivity and water resistance of concrete products when increasing and maintaining the strength characteristics.

2 cl, 1 tbl, 1 ex