RAW MIXTURE FOR MANUFACTURING LARGE FORMAT FIRE-RETARDANT BOARD AND METHOD FOR MANUFACTURING LARGE FORMAT FIRE-RETARDANT BOARD BASED ON THIS MIXTURE Russian patent published in 2023 - IPC E04B1/04 E04B1/94 C04B28/04 C04B14/04 C04B14/08 C04B14/14 C04B14/18 C04B14/20 C04B14/38 C04B111/28 

FIELD: construction materials.

SUBSTANCE: raw material mixture for the manufacture of large-format fire-retardant boards contains, wt.%: inorganic binder - Portland cement, or Portland slag cement, or Portland pozzolanic cement 38-50; as fillers, unfired siliceous rock with particle size of < 100 microns - diatomite, or zeolite, or opoka, or tuff, or volcanic ash 1.5-3; perlite 1.5-3; vermiculite 5-8; hydrated lime 2-7; fiber mixture 1.5-2.5; fire retardant - sodium tetraborate 0.2-0.5; additive accelerating the hardening of Portland cement - 1-2; air-entraining additive 0.01-0.05; plasticizing additive 0.01-1; mixing water - the rest. Fibre mixture - basalt fibre mixed with mullite and polypropylene fibres in a mass ratio of 2:10:2.5, respectively. In the method of manufacturing a large-format fire-retardant board, the specified board is obtained by preparing the above raw material mixture in a forced-type mixer by mixing the dry components of the raw mixture with mixing water and mixing the components of the raw mixture in a forced-type mixer, moulding in moulds by vibration casting, setting and hardening the said raw mixture in a chamber heat and humidity treatment. Hardening takes at least 10 days from the moment of pouring.

EFFECT: ensured fire resistance, high strength characteristics and thermal insulation properties of a large-format fire-retardant board, simplified technology for installing protective structures due to the large format and thickness of the board, and the possibility of using the resulting boards as ceiling boards.

5 cl, 3 tbl, 5 ex