Method of making heat-resistant concrete. RU patent 2374209.

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of construction materials and can be used in making construction objects and structures from heat-resistant concrete. The method of making heat-resistant concrete involves batching filler and binder components, stirring them, moulding objects and hardening, with subsequent ageing. The filler used is waste ash-slag mixture from Irkutsk thermal power plant 6 in Bratsk with packed density ρ=1250 to 1330 kg/m³, moisture 3 to 4%, consisting of 20 to 47% broken slag with particle size of 5 mm and 80 to 53% slag sand with fineness modulus of 4.41 to 3.57, with the following ratio of fractions, %: 5 mm fraction - 20.0 to 47.0, 2.5 mm fraction - 10.0 to 26.6, 1.25 mm fraction - 11.0 to 11.2, 0.63 mm fraction - 9.0 to 23.0, 0.315 mm fraction - 2.0 to 9.0, 0.14 mm fraction - 7.8 to 11, less than 0.14 mm fraction - 2.2 to 10. Ash alkaline binder is used, consisting of field I flue ash, obtained from burning brown Kansko-Achinsky coal at thermal power plant 7 in Bratsk Irkutsk region, and liquid glass from multitonnage wastes from ferrosilicon production at the ferro-alloy-microsilica Bratsk factory with packed density of 230 to 245 kg/m³ and containing fine crystalline graphite particles and β-modification of silicon carbide in amount of 10 to 13%, with silica modulus n=1 and density ρ=1.33-1.41 g/cm³, with the following ratio of components, wt %: said flue ash 17.2 to 40.3, said liquid glass 19.8 to 31.2, said slag sand 10.3 to 24.1, said broken slag 27.2 to 41.0. Objects are moulded at pressure 1 to 5 MPa. Solidification takes place in a stream treatment chamber at 80°C in a 2+3+3+3 hour mode with subsequent holding steamed objects from which forms have been removed for 30 to 60 days at ambient temperature of 20 to 25°C.

EFFECT: increased heat resistance of concrete.

1 ex, 1 tbl

IPC classes for russian patent Method of making heat-resistant concrete. RU patent 2374209. (RU 2374209):

C04B40 - Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability (by selecting active ingredients C04B0022000000-C04B0024000000; hardening of a well-defined composition C04B0026000000-C04B0028000000; making porous, cellular or lightening C04B0038000000)

C04B28/26 - Silicates of the alkali metals

C04B111/20 - LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS (devitrified glass-ceramics C03C0010000000); REFRACTORIES (alloys based on refractory metals C22C); TREATMENT OF NATURAL STONE

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