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CN-121974649-A - Solid waste-based concrete and preparation method and application thereof

CN121974649ACN 121974649 ACN121974649 ACN 121974649ACN-121974649-A

Abstract

The application relates to solid waste-based concrete, a preparation method and application thereof, and belongs to the technical field of building materials. The concrete comprises, by mass, 1% -2% of refined slag powder, 12% -28% of slag powder, 5% -10% of steel slag powder, 3% -6% of desulfurized gypsum powder, 5% -10% of steel slag, 30% -45% of slag, 5% -10% of fly ash and 3% -5% of high-alkali ash. The novel concrete material which meets basic requirements of building structures and realizes excellent heat preservation and heat insulation performance is developed by using all steel solid wastes as main raw materials through scientific preparation processes such as foaming, lightweight aggregate selection, micropore structure regulation and control and the like.

Inventors

  • GUO YANYONG
  • MIAO CHENGLIANG
  • ZENG XIONGFENG
  • TENG ZHAOJIE
  • CHEN YANBO
  • CHENG ZHENGMING
  • WANG TONGBIN
  • QI ZIHAN
  • LI YANQI

Assignees

  • 首钢京唐钢铁联合有限责任公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. The solid waste-based concrete is characterized by comprising, by mass, 1% -2% of refined slag powder, 12% -28% of slag powder, 5% -10% of steel slag powder, 3% -6% of desulfurized gypsum powder, 5% -10% of steel slag, 30% -45% of slag, 5% -10% of fly ash and 3% -5% of high-alkali ash.
  2. 2. The concrete according to claim 1, wherein the grain size of the refined slag powder is 3 μm to 30 μm, the grain size of the steel slag powder is 3 μm to 30 μm, the grain size of the desulfurized gypsum powder is 3 μm to 30 μm, the grain size of the steel slag is 0.25mm to 1.50mm, the grain size of the fly ash is 10 μm to 50 μm, and the grain size of the high alkali ash is 3 μm to 30 μm.
  3. 3. A method for preparing the concrete according to any one of claims 1 to 2, comprising: mixing the concrete raw materials according to any one of claims 1-2 to obtain a dry mixed material; Dissolving a slow-release type polycarboxylate water reducer in water to obtain an aqueous solution; stirring the aqueous solution and the dry mixture for one time to obtain a wet mixture; Stirring the wet mixed material and aluminum powder for the second time to obtain a castable; and (3) sequentially molding, demolding and curing the castable to obtain the concrete block.
  4. 4. The method according to claim 3, wherein the mixing is carried out for a period of 3min to 5min, and/or, The mass of the slow-release polycarboxylate water reducer is 0.5% -2.0% of the total mass of the concrete raw material.
  5. 5. The method according to claim 3, wherein the ratio of the aqueous solution to the dry blend is 0.4 to 0.6, and/or, The time of one-time stirring is 3 min-5 min.
  6. 6. A method according to claim 3, wherein the mass of the aluminum powder is 0.10% -0.15% of the total mass of the concrete raw material, and/or, And the secondary stirring time is 3-5 min.
  7. 7. A method according to claim 3, wherein the moulding is allowed to stand for a period of 24 to 26 hours.
  8. 8. The method according to claim 3, wherein the curing temperature is 35-45 ℃, the humidity of the curing is 92-98%, and the curing time is 72-75 h.
  9. 9. A method according to claim 3, wherein the concrete block has a volume weight of 450kg/m 3 ~640kg/m 3 , the concrete block 28d has a compressive strength of 4.25mpa to 5.58mpa, the concrete block 28d has a flexural strength of 1.80mpa to 3.80mpa, and the concrete block has a thermal conductivity of 0.13W/(m-K) to 0.15W/(m-K) at a test temperature of 25 ℃ in an insulated state.
  10. 10. The application of the concrete according to any one of claims 1-2, wherein the concrete is applied to heat preservation and insulation of an outer wall of a building.

Description

Solid waste-based concrete and preparation method and application thereof Technical Field The application relates to the technical field of building materials, in particular to solid waste-based concrete, a preparation method and application thereof. Background The solid waste-based concrete is a light building material prepared by taking industrial solid waste as a main raw material, and the core aim of the solid waste-based concrete is to remarkably improve the heat preservation and heat insulation performance of the exterior wall enclosure structure on the premise of meeting the basic mechanical requirements of the building structure, thereby effectively reducing the energy consumption of building operation. The solid waste-based concrete is an important technical path for realizing the collaborative development of building energy conservation and industrial solid waste recycling, and has a key meaning for promoting the green transformation of the steel industry and realizing the 'double carbon' target. The conventional solid waste-based concrete still has obvious technical limitations that on one hand, the formula of the solid waste-based concrete always depends on non-solid waste raw materials such as river sand, natural crushed stone and the like, and the real full solid waste production cannot be realized, and on the other hand, the solid waste sources used in the prior art are mixed, so that the large amount of solid waste in the steel industry cannot be systematically and massively consumed in a targeted manner, and the popularization effect of the solid waste-based concrete in the high-value utilization of the solid waste in steel is limited. Disclosure of Invention The application provides solid waste-based concrete and a preparation method and application thereof, and aims to solve the technical problem of how to prepare the solid waste-based concrete with good mechanical property and excellent heat preservation and insulation performance. In the first aspect, the embodiment of the application provides solid waste-based concrete, which comprises, by mass, 1% -2% of refined slag powder, 12% -28% of slag powder, 5% -10% of steel slag powder, 3% -6% of desulfurized gypsum powder, 5% -10% of steel slag, 30% -45% of slag, 5% -10% of fly ash and 3% -5% of high-alkali ash. Optionally, the grain size of the refined slag powder is 3-30 μm, the grain size of the steel slag powder is 3-30 μm, the grain size of the desulfurized gypsum powder is 3-30 μm, the grain size of the steel slag is 0.25-1.50 mm, the grain size of the fly ash is 10-50 μm, and the grain size of the high-alkali ash is 3-30 μm. In a second aspect, an embodiment of the present application provides a method for preparing concrete according to the first aspect, the method comprising: Mixing the concrete raw materials including 1-2% of refined slag powder, 12-28% of slag powder, 5-10% of steel slag powder, 3-6% of desulfurized gypsum powder, 5-10% of steel slag, 30-45% of slag, 5-10% of fly ash and 3-5% of high-alkali ash to obtain a dry mixed material; Dissolving a slow-release type polycarboxylate water reducer in water to obtain an aqueous solution; stirring the aqueous solution and the dry mixture for one time to obtain a wet mixture; Stirring the wet mixed material and aluminum powder for the second time to obtain a castable; and (3) sequentially molding, demolding and curing the castable to obtain the concrete block. Optionally, the mixing time is 3 min-5 min. Optionally, the mass of the slow-release polycarboxylate water reducer is 0.5% -2.0% of the total mass of the concrete raw material. Optionally, the water-cement ratio of the aqueous solution to the dry blend is 0.4-0.6. Optionally, the time of one stirring is 3 min-5 min. Optionally, the mass of the aluminum powder is 0.10% -0.15% of the total mass of the concrete raw material. Optionally, the secondary stirring time is 3 min-5 min. Optionally, the standing time of the molding is 24-26 hours. Optionally, the curing temperature is 35-45 ℃, the curing humidity is 92-98%, and the curing time is 72-75 hours. Optionally, the volume weight of the concrete block is 450kg/m 3~640kg/m3, the compressive strength of the concrete block 28d is 4.25-5.58 MPa, the flexural strength of the concrete block 28d is 1.80-3.80 MPa, and the thermal conductivity of the concrete block at 25 ℃ under the testing temperature is 0.13W/(m.K) -0.15W/(m.K) in the absolute dry state. In a third aspect, an embodiment of the present application provides an application of the concrete in the first aspect, where the concrete is applied to thermal insulation of an exterior wall of a building. Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: The embodiment of the application provides solid waste-based concrete and a preparation method and application thereof. The concrete comprises, by mass, 1% -2% of refined slag powder, 12% -28% of slag po