RU2571780C1 - Composition for production of heat-resistant concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: composition of fire-resistant concretes includes components with the following component ratio, wt %: spent catalyst IM-2201 10-15, crushed stone 33-40, sand 10-13, H₃PO₄ 10-15, electric arc furnace slag (which contains, wt %: SiO₂ - 21.15; Al₂O₃ - 8.81; Fe₂O₃ - 14.9; CaO - 42.98; MgO - 11.77; SO₃ - 0.24; Na₂O - 0.07; K₂O - 0.08) 24-30. EFFECT: increase of durability limit in compression and thermal-stability of fire-resistant concretes.

EFFECT: 3 tbl.

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 water 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; the waste of a mining and processing factory in coal enrichment - 15-20; inter-shale clay formed during the production of oil shale - 15-20 / US Pat. Russian Federation No. 2440312, IPC C04B 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. Queen. No. 2012222114, declared 05/31/20910; publ. 01/20/2012. 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.%: 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 / Pat of the Russian Federation No. 2521005, IPC C04B 28/34. Composition for the manufacture of heat-resistant composites. / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kolpakov A.V .; applicant and patent holder Samara State Aerospace University named after S.P. Queen. No. 2013102609. Claim 01/21/2013; publ. 06/27/2014. 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, crushed stone, sand and H ₃ PO ₄ , electro-smelting slag is additionally introduced with a content, wt.%: SiO ₂ - 21.15; Al ₂ O ₃ - 8.81; Fe ₂ O ₃ - 14.9; CaO - 42.98; MgO 11.77; SO ₃ 0.24; Na ₂ O - 0.07; K ₂ O - 0.08 in the following ratio of components, wt. %:

spent catalyst IM-2201 10-15 crushed stone 33-40 sand 10-13 H ₃ PO ₄ 10-15 electric smelting slag 24-30

Electric steelmaking slag - is a waste of the Oskol Electrometallurgical Plant (OEMK), which contains mainly: γ-C ₂ S, calcium ferrites and calcium-magnesium silicates.

Slags are aggregated particles ranging in size from 0.20 to 20 mm. The chemical composition of electric steelmaking slag is presented in table 1.

For the manufacture of heat-resistant concrete, the following were used:

A) crushed stone that meets the requirements of GOST G 8267-93 "Crushed stone and gravel from dense rocks for construction work. Specifications "M 600, 800-1000, with an average grain density of 2.0 to 2.5 kg / m ³ from carbonate rocks, mined in the Samara region, fractions of 5-10 mm.

B) sand that meets the requirements of GOST 8736-93 “Sand for construction work. Technical conditions. " River sand, mined in the Samara region, had the following indicators: average density in the dry state - 1.5 kg / m ³ ; the content of silty, dusty and clay particles is not more than 0.7% by weight; the true density of river sand is 2.65 g / cm ³ ; the presence of loam, lumps of clay and other clogging impurities no more than - 0.05%; fineness modulus - 1.68.

For the manufacture of heat-resistant concrete, orthophosphoric acid H ₃ PO _{4 was} used as a binder in pure form according to GOST 6552-80, the norm was pure (parts) OKP 26 1213 0021 10. Mass fraction of orthophosphoric acid (H ₃ PO ₄ ), not less than 85 %, density not less than 1.69 g / cm ³ .

In the proposed compositions (table 2), as in the prototype, the spent catalyst IM-21 (production waste) was used that meets the requirements of TU 38.103544-89. The chemical composition of the catalyst are presented in table 1.

According to TU 38.103544-89 spent catalyst IM-2201 must have the following indicators: the appearance of the powder is gray-green in color, bulk density is 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.

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 2 - 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 with the oven.

Table 3 presents the physical and mechanical properties of heat-resistant concrete.

As can be seen from table 3, 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 electric steelmaking slag allows to increase the indicators of mechanical strength and heat resistance of heat-resistant concrete.

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

INFORMATION SOURCES

1. Pat. Russian Federation No. 2440312, IPC C04B 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. Queen. - No. 2010122114. declared 05/31/2010; publ. 01/20/2012. Bull. No. 2.

2. Patent of the Russian Federation No. 2521005, IPC C04B 28/34. Composition for the manufacture of heat-resistant composites. / Abdrakhimova E.S., Roshchupkina I.Yu., Abdrakhimov V.Z., Kolpakov A.V .; applicant and patent holder Samara State Aerospace University named after S.P. Queen. No. 2013102609. Claim 01/21/2013; publ. 06/27/2014. Bull. Number 18.

Claims (1)

Composition for the manufacture of heat-resistant concrete, including spent catalyst IM-2201 and H ₃ PO ₄ , characterized in that it additionally contains electric steel slag with a content, wt.%: SiO ₂ - 21.15; Al ₂ O ₃ - 8.81; Fe ₂ O ₃ - 14.9; CaO - 42.98; MgO 11.77; SO ₃ 0.24; Na ₂ O - 0.07; K ₂ O - 0.08 in the following ratio of components, wt.%:
spent catalyst IM-2201 10-15 crushed stone 33-40 sand 10-13 H ₃ PO ₄ 10-15 electric smelting slag 24-30