RU2576067C1 - Composition for production of heat resistant concretes - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: composition for production of heat resistant concretes, including spent catalyst IM-2201, carbonate crushed stone of fraction 5-10 mm, river sand with size modulus of 1.68 and H₃PO₄ with density of at least 1.69 g/cm³, additionally contains magnesium-containing slag from production of high-carbon ferrochrome with content of, wt %: Cr₂O₃ - 3.72; SiO₂ - 28.33; Al₂O₃ - 19.3; FeO - 0.94; CaO - 0.91; MgO - 46.8, at the following ratio of components, wt %: spent catalyst IM-2201 - 10-15, carbonate crushed stone of fraction 5-10 mm - 33-40, river sand with size modulus of 1.68 - 10-13, H₃PO₄ with density of at least 1.69 g/cm³ - 10-15, magnesium-containing slug of high-carbon ferrochome production with content of, wt %: Cr₂O₃ - 3.72; SiO₂ - 28.33; Al₂O₃ - 19.3; FeO - 0.94; CaO - 0.91; MgO - 46.8, - 24-30.

EFFECT: increased strength limit under compression and heat resistance of heat resistant concretes.

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Description

The invention relates to the field of building materials, in particular the production of heat-resistant concrete based on chemical binders. Chemical binders used in heat-resistant concrete include liquid glass, silicate block (a transparent glassy alloy of alkaline silicates - semi-finished liquid glass) and phosphate bonds.

Known compositions for producing porous aggregates (for concrete) based on chemical binders of the following composition, wt. %: water glass - 45-65; sodium chloride - 5-15; waste from a mining and processing factory in coal enrichment - 15-20; inter-shale clay formed during the extraction of oil shale, 15-20 (patent of the Russian Federation No. 2440312, IPC С04В 14/24. Composition for the production of porous aggregate / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kulikov V.A .; applicant and patent holder Samara State Aerospace University named after academician S.P. Korolev No. 2010122114, application. May 31, 2010; published on January 20, 2012. Bull. No. 2) [1].

The disadvantage of this composition is the relatively low strength of 2.65-2.75 MPa.

Closest to the invention is a composition for producing heat-resistant concrete (composites), comprising the following components, wt. %: alumina-containing sludge - 10.5-10.53 (220 kg / cm ³ ); spent catalyst IM-2201 - 10-15; crushed stone - 33-40; sand - 10-13; H ₃ PO ₄ - 10-15; slag from the smelting of ferrotitanium with a content, wt. %: SiO ₂ - 2.5; Al ₂ O ₃ - 72.18; TiO ₂ - 10.2; Fe ₂ O ₃ - 0.30; CaO - 11.4; MgO - 3.3, - 24-30 (patent of the Russian Federation No. 2521005, IPC С04В 28/34. Composition for the manufacture of heat-resistant composites / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kolpakov A. B .; applicant and patent holder Samara State Aerospace University named after SP Korolev No. 2013102609, application. January 21, 2013; publ. June 27, 2014. Bull. No. 18) [2].

The disadvantage of this composition is the relatively low compressive strength after hardening and heating to a temperature of 1200 ° C and low heat resistance.

The objective of the invention is to improve the quality of heat-resistant concrete (composite).

The technical result of the invention is to increase the compressive strength and heat resistance of heat-resistant concrete (composites).

The specified technical result is achieved by the fact that in the known composition, including the spent catalyst IM-2201, carbonate crushed stone fractions of 5-10 mm, river sand with a particle size modulus of 1.68 and N ₃ PO _{4 with a} density of at least 1.69 g / cm ³ , additionally magnesium-containing slag is introduced from the production of high-carbon ferrochrome with a content, wt. %: Cr ₂ O ₃ - 3.72; SiO ₂ 28.33; Al ₂ O ₃ - 19.3; FeO - 0.94; CaO - 0.91; MgO - 46.8 in the following ratio of components, wt. %:

spent catalyst IM-2201 10-15 carbonate crushed stone fractions 5-10 mm 33-40 river sand with a particle size modulus of 1.68 10-13 H ₃ PO _{4 with a} density of at least 1.69 g / cm ³ 10-15 magnesium-containing slag from the production of high-carbon ferrochrome with a content, wt.%: Cr ₂ O ₃ - 3.72; SiO ₂ 28.33; Al ₂ O ₃ - 19.3; FeO - 0.94; CaO - 0.91; MgO - 46.8 24-30

Magnesium-containing slag from the production of high-carbon ferrochrome is formed during the smelting of ferroalloys in smelters in the production of high-carbon ferrochrome. The particle size distribution is represented by the following fractions,%: 0-5 mm - 15; 5-20 mm - 25; 20-60 mm - 60. The mineralogical composition is represented by the main minerals: amorphous glass phase, quartz (SiO ₂ ), pyroxene - Ca (Mg, Fe) [Si ₂ O ₆ ]; corundum (Al ₂ O ₃ ); spinel (Mg, Al ₂ O ₄ ); chrome spinel (Mg, 4

According TU 38.103544-89 spent catalyst IM-2201 should have the following parameters: Appearance powder - gray-green color, a bulk density of 1.0-1.5 g / cm ^3; mass fraction of Al ₂ O ₃ not less than 70%.

Information confirming the possibility of carrying out the invention. The technological process for the production of cementless heat-resistant concrete and the manufacture of products and structures from them includes the preparation of molding materials, molding of products and heat treatment. Compositions for the production of heat-resistant composites are presented in table 1.

It should be noted that for their hardening and a set of brand strength, heat-resistant concrete requires special heat treatment.

For phosphoric acid concrete with the components shown in table 1, heating to 500 ° C with a temperature rise of 200 ° C at a rate of 60 ° C / h and up to 500 ° C - 150 ° C / h, keeping for 4 hours cooling along with the oven.

Table 2 presents the physico-mechanical properties of heat-resistant concrete.

As can be seen from table 2, heat-resistant concrete from the proposed compositions has higher rates of mechanical strength and heat resistance than the prototype.

The resulting technical solution when using magnesium-containing slag from the production of high-carbon ferrochrome can significantly increase the mechanical strength and heat resistance of heat-resistant concrete.

The use of technogenic raw materials in obtaining a heat-resistant composite contributes to the utilization of industrial waste, environmental protection and the expansion of the raw material base for building materials.

Claims (1)

Composition for the manufacture of heat-resistant concrete, including spent catalyst IM-2201, carbonate crushed stone fraction 5-10 mm, river sand with a particle size module of 1.68 and N ₃ PO _{4 with a} density of at least 1.69 g / cm ³ , characterized in that it additionally contains magnesium-containing slag from the production of high-carbon ferrochrome with a content, wt. %: Cr ₂ O ₃ - 3.72; SiO ₂ 28.33; Al ₂ O ₃ - 19.3; FeO - 0.94; CaO - 0.91; MgO - 46.8 in the following ratio of components, wt. %:
spent catalyst IM-2201 10-15 carbonate crushed stone fractions 5-10 mm 33-40 river sand with a particle size modulus of 1.68 10-13 H ₃ PO _{4 with a} density of at least 1.69 g / cm ³ 10-15 magnesium-containing slag from the production of high-carbon ferrochrome content, wt. %: Cr ₂ O ₃ - 3.72; SiO ₂ 28.33; Al ₂ O ₃ - 19.3; FeO - 0.94; CaO - 0.91; MgO - 46.8 24-30