FILLING EMPTY BUILDING BRICK WITH POROUS MATERIAL Russian patent published in 2018 - IPC C04B28/18 C04B38/00 C04B33/00 

FIELD: construction.

SUBSTANCE: building brick consists of clay or cement and has a cellular structure that contains a porous material. The porous material comprises 25 to 75% by weight of silica, 75 to 25% by weight of calcium hydroxide, and 0 to 5% by weight of magnesium oxide. The microstructure of the brick is composed of pellets and/or needle-shaped crystals to form pores with an average diameter D50 ranging from 0.1 to 10 mcm. The porous material has a porosity in the range of 60 to 95% and is contained in at least a portion of the cells of the cellular structure. The method for manufacturing a building brick comprises the following successive steps. In stage a), the open porosity of the cellular structure of the cellular brick is neutralized. In step b), a mixture containing silica, quicklime and water is produced, such that the weight ratio of water/(CaO+SiO₂) is in the range of 2 to 60 and a weight ratio of CaO/SiO₂ is in the range from 0.8 to 1.2. The inner surface of the honeycomb brick obtained as a result of step a) is then impregnated. Fill the brick cells with the mixture obtained in step b). Conduct a hydrothermal synthesis of bricks by heating at temperature within a range from 80 to 200°C and at a pressure of saturated water vapour that is in the range of 1^.10⁵ to 25^.10⁵ Pa, during the time of from 1 to 40 hours from the receipt of the ceramic mass. Dry the brick at a temperature ranging from 100 to 450°C, for a period of 1 to 30 hours. The block includes one or more building bricks.

EFFECT: increase the thermal stability of products due to minimization of convection effects while maintaining high mechanical strength.

14 cl, 11 dwg, 4 tbl, 2 ex