RU2374200C1 - Raw mixture for making heat-resistant ash-slag concrete - Google Patents

Abstract

FIELD: chemistry. ^ SUBSTANCE: invention relates to the industry of construction materials and can be used in making structures and objects from heat-resistant concrete based on ash-slag filler and allows for efficient use of multitonnage industrial wastes. The raw mixture for making heat-resistant ash-slag concrete contains, wt %: 35.0 to 60.0 filler - dump ash-slag mixture from Irkutsk thermal power plant 6 in Brask, from burning brown coal from KATEK Irsh-Borodin open-pit coal mine with packed density of the ash-slag mixture üpack=1350-1400 kg/m3, consisting of 10% ash and 90% slag, with particle size from 0.315 to 5.0 mm and moisture from 2 to 3% with the following fractions in the given ratios, %: 5 mm fraction - 22.44, 2.5 mm fraction - 29.56, 1.25 mm fraction - 12.44, 0.63 mm fraction - 25.56, 0.315 mm fraction - 10.0, and binder from flue ash from burning brown coal from Kansko-Achinsky thermal power plant 7, Bratsk field 1 with üpack=800-850 kg/m3 and sieve No.008 residue - 6.7%, 17.8 to 38.9, and liquid glass from wastes from production of ferrosilicon at the Bratsk ferro-alloy - microsilica production factory with üpack=230-245 kg/m3 and containing fine grained crystalline impurities in form of graphite and -carborundum in amount ranging from 10 to 13%, with silica module n=1 and density ü=1.32-1.35 g/cm3, 20.0 to 30.2. ^ EFFECT: increased fire resistance of concrete with simultaneous simplification of the production process, reduced cost of the final product. ^ 1 ex, 1 tbl

Description

The invention relates to the building materials industry and can be used for the manufacture of structures and products from heat-resistant concrete based on ash and slag aggregate and allows for the efficient use of large-tonnage industrial wastes.

Known concrete mixtures, including Portland cement, as well as ashes, slags and ash and slag mixtures instead of traditional aggregates [Nanazashvili I.Kh. Building Materials, Products, and Structures: Reference Book. - M .: Higher. Shk. 1990. - p. 34].

The disadvantage of such mixtures is the use of expensive Portland cement.

Closest to the invention, in technical essence, is a raw material mixture, including a binder, consisting of ground to a residue on a sieve No. 008 - 3.3% of waste ash and slag mixture and liquid glass of silica fume, as well as aggregate - non-ground dump ash and slag mixture with grain size 0.14-5.0 mm. [Patent No. 2181706, 2002].

The disadvantages of this mixture is the insufficient heat resistance of concrete based on it, which limits the use of the resulting concrete, as well as the need for fine grinding of ash and slag mixture, which greatly complicates the process and increases the cost of the finished product.

The problems solved by the invention are to improve the quality of concrete, simplifying the process of obtaining it, expanding its fields of application.

The technical result is an increase in the heat resistance of concrete while simplifying the process of obtaining it, reducing the cost of finished products.

The specified technical result in the implementation of the invention is achieved by the fact that the raw material mixture for the preparation of heat-resistant ash and slag concrete includes aggregate and binder, consisting of fly ash obtained from burning brown Kansk-Achinsk coal at TPP-7 in Bratsk, Irkutsk region and liquid glass, in The waste ash and slag mixture of the Irkutsk TPP-6 in Bratsk, obtained from the burning of brown coal from KATEK Irsha-Borodinsky coal mine with a bulk density of ash and slag mixture ρ _us = 1350-1400 kg / m, is used as a filler ³ , consisting of 10% ash and 90% slag, with a grain size of 0.315-5.0 mm and a moisture content of 2-3% in the following grain ratio of fractions:

fr. 5 mm - 22.44% fr. 2.5 mm - 29.56% fr. 1.25 mm - 12.44% fr. 0.63 mm - 25.56% fr. 0.315 mm - 10.0%

as fly ash, ash of field I is used with ρ _us = 800-850 kg / m ³ and a sieve residue No. 008 of 6.7%, and liquid glass is made of liquid glass made from large tonnage waste produced by the Bratsk Ferroalloys Ferrosilicon Plant - silica fume with ρ _us = 230-245 kg / m ³ and containing highly dispersed crystalline impurities in the form of graphite and β-carborundum in the amount of 10-13%, with silicate module n = 1 and density ρ = 1.32-1.35 kg / m ³ , in the following ratio of components, wt.%:

Indicated fly ash 17.8-38.9% Specified Liquid Glass 20.0-30.2% The specified ash and slag mixture 35.0-60.0%

Example. The raw material mixture for the preparation of concrete was prepared as follows. The fly ash of the first field was mixed with a waste ash and slag mixture, everything was closed with silica gel liquid glass with silicate module n = 1 and density ρ = 1.35 kg / m ³ . The mixture was mixed in a forced-action concrete mixer for 2-3 minutes. The formation of samples - beams 4 × 4 × 16 cm in size was carried out on a laboratory vibratory platform. Samples solidified in a TBO chamber at a temperature of 90 ± 5 ° С for 9 hours. After that, part of the steamed samples was tested for strength, and the remaining samples were dried in an oven at T = 105-110 ° C for 48 hours, after which they were directly tested for heat resistance - in a muffle furnace at T = 1000 ° C for four hours . The rate of rise and decrease in temperature was 150 ° C / hour. After such tests, the samples were tested for strength. Similarly prepared and tested concrete based on raw mixtures of two more compounds. The results are presented in the table.

Table Heat resistance of concrete No. p / p Liquid glass properties The composition of the mixture, wt.h,% Concrete properties Ash and Slag
va mixture Fly ash Liquid glass Strength after TVO, MPa The average density of dried concrete, kg / m ³ Coef. design qualities Residual strength after firing,% Silicate
module Density, g / cm ³ one one 1.32 48.78 24.39 26.83 7.2 1653 0.004 119 2 one 1.33 37.00 33.33 29.67 8.7 1640 0.005 84 3 one 1.35 48.19 24.10 27.71 14.7 1658 0.009 78

An analysis of the data shows that concrete based on the proposed raw material mixture is characterized by fairly high grades and residual strengths at low average densities: up to 14.7 MPa, 119% and 1640 kg / m ^3, respectively. The technological process of obtaining the proposed raw mix is much simpler, because fly ash, in contrast to the ash and slag mixture, according to the prototype, does not require grinding. In addition, the proposed raw mix is cheaper than analogue, because in the technological process of its production there is no very energy-, metal- and labor-intensive operation - grinding.

Claims (1)

The raw material mixture for the preparation of heat-resistant ash and slag concrete includes a filler and a binder, consisting of fly ash obtained from burning brown Kansko-Achinsky coal at TPP-7 in Bratsk, Irkutsk region, and liquid glass, characterized in that dump ash and slag is used as a filler a mixture of the Irkutsk CHPP-6 in Bratsk obtained from the burning of brown coal from KATEK Irsha-Borodinsky coal mine with a bulk density of ash and slag mixture
ρ _us = 1350-1400 kg / m ³ , consisting of 10% ash and 90% slag, with a grain size of 0.315-5.0 mm and a moisture content of 2-3% in the following grain ratio of fractions:
fr. 5 mm 22.44% fr. 2.5 mm 29.56% fr. 1.25 mm 12.44% fr. 0.63 mm 25.56% fr. 0.315 mm 10.0%
as fly ash, ash of field I is used with ρ _us = 800-850 kg / m ³ and a sieve residue No. 008 of 6.7%, and liquid glass is made of liquid glass made from large tonnage waste produced by the Bratsk Ferroalloys Ferrosilicon Plant - silica fume with ρ _us = 230-245 kg / m ³ and containing highly dispersed crystalline impurities in the form of graphite and β-carborundum in the amount of 10-13%, with silicate module n = 1 and density ρ = 1.32-1.35 kg / m ³ in the following ratio of components, wt.%:
Indicated fly ash 17.8-38.9 Specified Liquid Glass 20.0-30.2 The specified ash and slag mixture 35.0-60.0