RU2471740C2 - Crude mixture for producing acid-resistant ash-slag concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of structural materials and can be used in making structures and articles from acid-resistant concrete based on ash-slag aggregate and enables efficient use of large-tonnage industrial wastes. The crude mixture for producing acid-resistant ash-slag concrete contains an aggregate and binder which consists of an aluminosilicate component and an alkaline component - liquid glass with silica modulus n=0.9-1.3 and density ρ=1.28-1.41 g/cm³ and produced from ferroalloy wastes - microsilica which contains 10-15 wt % impurities and is characterised by packed density ρ_n=160-190 kg/m³; the aluminosilicate component consists of 30% field II flue ash obtained from burning brown coal from KATEK at Bratsk TPP-7 and is characterised by packed density ρ_n=755-775 kg/m³ and 1.5-2.3% residue at sieve No.0008, and 70% waste ash-slag mixture ground to 0.5% residue at sieve No.008 which is obtained from burning brown coal from KATEK at Bratsk TPP-6, characterised by packed density ρ_n=1150-1180 kg/m³, and the aggregate used is non-ground waste ash-slag mixture consisting of 15.5% waste ash with particle size of 0.315 mm or smaller and 84.5% slag with grain size which is characterised by fineness modulus M_k=3.1, with the following ratio of grains of fractions, %: 10 mm - 10.6; 5 mm - 53.2; 2.5 mm - 10.8; 1.25 mm - 14.9; 0.63 mm - 10.5, and strength according to Dr=12, with the following ratio of components of the crude mixture, wt %: field II ash - 6.2-6.3; said ground ash-slag mixture 14.5-14.7; said liquid glass - 15.8-17.3; said non-ground ash-slag mixture - 62.1-63.25.

EFFECT: high acid-resistance of concrete.

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Description

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

Known concrete mixtures, including a binder, consisting of ground to a residue on a sieve No. 008 3.3% dump ash and slag mixture and liquid glass of silica fume, as well as a filler - non-ground dump ash and slag mixture with grain size of 0.14-5.0 mm [Patent RF №2181706, 2002].

The disadvantage of such mixtures is the lack of acid resistance, which limits the use of the resulting concrete.

The closest analogue to the described invention is a raw material mixture, including aggregate - dump ash and slag mixture of Irkutsk TPP-6 in Bratsk with a bulk density ρ _n = 1300 kg / m ³ and with a grain size of 0.315-10.0 mm and an astringent consisting of ash -unosa II field of Irkutsk TPP-7 in Bratsk and carbon-containing liquid glass made from large-tonnage waste from the production of ferrosilicon of the Bratsk ferroalloy plant - silica fume containing highly dispersed carbon impurities, with silicate module n = 1-2 and density ρ = 1.35-1 40 g / cm ³ [Patent RU No. 2329987, C1, C04B 28/26, C04B 111/23, 07/27/2008, 4 pp.].

The disadvantages of the described raw material mixture are the insufficient acid resistance of the resulting concrete, as well as the use of field II fly ash as the main raw material component, the formation volumes of which are small.

The problem solved by the invention is to improve the quality of the raw mix, expanding the range of raw materials.

The technical result is an increase in the acid resistance of concrete.

The specified technical result in the implementation of the invention is achieved by the fact that the raw material mixture for the preparation of acid-resistant ash and slag concrete includes a filler and a binder, consisting of an aluminosilicate component and an alkaline component - liquid glass with a silicate module n = 0.9-1.3 and density ρ = 1, 28-1.41 g / cm ³ made from ferroalloy production waste - silica fume containing 10-15 wt.% Impurities and characterized by a bulk density ρ _n = 160-190 kg / m ³ ; the aluminosilicate component consists of 30% of fly ash of the II field obtained by burning KATEK brown coal at TPP-7 in Bratsk and characterized by a bulk density of ρ _n = 755-775 kg / m ³ and a residue on sieve No. 008 of 1.5- 2.3%, and 70% from the ground to the residue on sieve No. 008 of 0.5% of the waste ash and slag mixture formed during the burning of brown coal from KATEK at TPP-6 in Bratsk, characterized by a bulk density of ρ _n = 1150-1180 kg / m ^3, and as a filler used unground moldboard zoloshlakovyh mixture consisting of 15.5% of the moldboard ash particle size of 0.315 mm or less, and n 84.5% - of slag with a grain size characterized fineness modulus M _A = 3.1, at a ratio of grain fractions,%:

fr. 10 mm - 10.6 fr. 5 mm - 53.2 fr. 2.5 mm - 10.8 fr. 1.25 mm - 14.9 FR. 0.63 mm - 10.5

and strength according to Dr = 12, with the following ratio of the components of the raw mix, wt.%: the specified ash II field - 6,20-6,30; the specified ground ash and slag mixture is 14.47-14.70; the specified liquid glass is 15.80-17.30; the specified unfinished ash and slag mixture is 62.10-63.20.

The raw material mixture for the preparation of concrete was prepared as follows.

In a laboratory ball mill, the ash and slag mixture formed during the burning of brown coal from KATEK at CHPP-6 in Bratsk was milled and consisted of 15.5 wt.% Of ash and 84.5 wt.% Of slag, and characterized by bulk density ρ _n = 1150 kg / m ³ , to the remainder of the sieve No. 008 0.5%. The properties of the ash and slag mixture used are presented in tables 1-4.

Table 1 The main properties of the dump ash and slag mixture of CHPP-6 in Bratsk True density (ρ _and ), kg / m ³ Bulk density (ρ _n ), kg / m ³ Humidity (W),% Crushing Strength (Dr) Loss after calcination (SPP),% 2845 1150-1180 one Dr 12 2,5

table 2 Granulometric composition of dump ash and slag mixture of CHPP-6 in Bratsk Sieve residues,% Sieve hole sizes, mm for slag for ash 10 5 2,5 1.25 0.63 0.315 0.14 less than 0.14 private 9 44.9 9.1 12.6 8.9 5.8 3.6 6.1 full 9 53.9 63 75.6 84.5 90.3 93.9 one hundred

Table 3 The chemical composition of the dump ash and slag mixture of CHPP-6 in Bratsk Type of ash and slag waste Mass content of components, wt.% SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ R ₂ O CaO _total. CaO _St. MgO SO ₃ ash and slag mixture 48.0 8.6 6.7 0.6 26,4 6.4 2.9 0.4 ash ash and slag component 40.3 8.6 6.5 0.8 29.6 9,4 3.8 0.9 mixtures slag ash and slag component 66.3 7.9 5.3 3.8 14.0 - 2.1 0.7 mixtures

Table 4 Granulometric composition of the slag component of the dump ash-slag mixture of CHPP-6 in Bratsk Private sieve residues,% Sieve hole sizes, mm The modulus of fineness (MKR) 10 5 2,5 1.25 0.63 10.6 53,2 10.8 14.9 10.5 3.1

The above ground waste ash and slag mixture in an amount of 70% was mixed with 30% of fly ash of the II field obtained by burning brown coal from KATEK at TPP-7 in Bratsk, characterized by bulk density ρ _n = 755 kg / m ³ and residue on sieve No. 008 1.5%, and the above non-ground dump ash and slag mixture in the ratio of ash of the II field: ground dump ash and slag mixture: unmilled dump ash and slag mixture = 0.3: 0.7: 3. The properties of fly ash II field are presented in tables 5, 6.

Table 5 Properties of fly ash of the II field of TPP-7 in Bratsk True density, kg / m ³ Bulk density, kg / m ³ The residue on sieve No. 008,% Humidity% Loss after calcination (SPP),% 2530 755-775 1.5-2.3 1.7 2.2

Table 6 The chemical composition of fly ash of the II field of TPP-7 in Bratsk The content of compounds, wt.% SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ Cao MgO SO ₃ K ₂ O Na ₂ O 50,5 8.6 8.4 20.5 1.7 1,5 0.6 0.1

. Результаты испытаний представлены в таблице 7. Аналогично подготовлены и испытаны образцы других составов. Результаты представлены также в таблице 7.The resulting mixture of dry components was closed with silica gel glass, characterized by a bulk density ρ _n = 190 kg / m ³ and containing 12% of impurities in the form of graphite and carborundum with a silicate module n = 1 and a density ρ = 1.31 g / cm ³ . The mixture was mixed in a forced-action concrete mixer for 2-3 minutes. The formation of 4 × 4 × 16 cm beam samples was carried out on a laboratory vibratory platform. Samples were solidified in a TBO chamber at a temperature of 85 ± 5 ° C for 8 hours. After that, the steamed samples were tested. For this, part of the samples was placed in a solution of sulfuric acid of 5% concentration, and the other in water. Acid resistance of the proposed material was evaluated by the coefficient of resistance (K _s ):

. The test results are presented in table 7. Similarly prepared and tested samples of other compositions. The results are also presented in table 7.

Analysis of the data shows that on the basis of the proposed raw material mixture, it is possible to obtain acid-resistant concrete. In all cases, the resistance coefficient is more than 1. Moreover, the acid resistance of the proposed material is higher than similar indicators for the prototype. In addition, in the proposed raw material mixture, as the aluminosilicate component of the binder, not 1 (as in the prototype), but 2 large-tonnage wastes are used at once, which makes it possible to more fully solve environmental problems.

Claims (1)

Raw mix for the preparation of acid-resistant ash and slag concrete, including aggregate and binder, characterized in that the binder consists of an aluminosilicate component and an alkaline component - liquid glass with a silicate module n = 0.9-1.3 and density ρ = 1.28-1, 41 g / cm ³ made from ferroalloy production waste - silica fume containing 10-15 wt.% Impurities and characterized by a bulk density ρ _n = 160-190 kg / m ³ ; the aluminosilicate component consists of 30% of fly ash of the II field obtained by burning KATEK brown coal at TPP-7 in Bratsk and characterized by a bulk density of ρ _n = 755-775 kg / m ³ and a sieve residue of No. 008 - 1.5 -2.3%, and 70% from the ground to the residue on sieve No. 008 - 0.5% of the waste ash and slag mixture formed by burning KATEK brown coal at TPP-6 in Bratsk, characterized by a bulk density ρ _n = 1150- 1180 kg / m ^3, and as a filler used unground moldboard zoloshlakovyh mixture consisting of 15.5% of the moldboard ash with a particle size of 0.315 mm or less, and and 84.5% - of slag with a grain size characterized fineness modulus M _k = 3.1 at a ratio of grain fractions,%:
fr. 10 mm 10.6 fr. 5 mm 53,2 fr. 2.5 mm 10.8 fr. 1.25 mm 14.9 fr. 0.63 mm 10.5
and strength in Dr = 12 in the following ratio of components of the raw material mixture, wt.%:
Indicated ash II field 6.20-6.30 The specified ground ash and slag mixture 14.47-14.70 Specified Liquid Glass 15.80-17.30 The specified non-ground ash and slag mixture 62.10-63.20