Solid waste-based composite cementing material and preparation method thereof

Abstract

The invention discloses a solid waste-based composite cementing material and a preparation method thereof, and relates to the technical field of solid waste regeneration. The silicon dioxide is subjected to copper plating treatment and then added into the concrete, so that the strength of the concrete is enhanced. The methyl acrylate and the poly (ethylene glycol) methacrylate are used for modifying the carbon fibers, so that the hydrophilicity of the modified carbon fibers is enhanced, the compatibility of the modified carbon fibers and a concrete base material becomes good, the porosity of the concrete base material is reduced, and the strength of the concrete base material is enhanced. The copper-plated silicon dioxide and the modified carbon fiber are compounded together, and the carbide slag, the fly ash and the silica fume are modified by using gamma-aminopropyltriethoxysilane, so that the dispersity of the copper-plated silicon dioxide is improved, the compatibility of the silicon dioxide-carbon fiber compound in a concrete base material becomes good, and the strength of the concrete base material is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste regeneration, in particular to a solid waste-based composite gelling material and a preparation method thereof. Background Art

[0002] With the acceleration of global industrialization, the production of industrial solid waste, such as coal gangue, carbide slag, desulfurized gypsum, aluminum ash, and steel slag, continues to increase. The massive accumulation of these solid wastes not only consumes land resources but also poses a significant environmental risk. Therefore, effectively utilizing and recycling these solid wastes has become a pressing issue.

[0003] In the field of building materials, traditional cementitious materials such as cement consume large amounts of natural mineral resources during production and have high carbon emissions. To reduce dependence on natural resources and reduce carbon emissions, researchers have begun exploring the use of industrial solid waste to prepare composite cementitious materials. However, existing concrete materials still have some shortcomings in performance and application. The strength of the material needs to be improved. In addition, the physical and chemical properties of different solid wastes vary significantly. How to achieve the synergistic effect of multiple solid wastes and optimize material performance is also an issue that requires further research.

[0004] In order to solve the above problems and improve the strength of the material, the present invention provides a solid waste-based composite gelling material and a preparation method thereof. Summary of the Invention

[0005] The object of the present invention is to provide a solid waste-based composite gelling material and a preparation method thereof, so as to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for preparing a solid waste-based composite gelling material comprises the following steps: taking carbide slag, slag powder, and silica fume, grinding them to obtain a gelling material; taking the gelling material, adding toluene, ultrasonically dispersing the gelling material, adding γ-aminopropyltriethoxysilane, stirring for 20-22 hours, centrifuging, washing, and drying to obtain the solid waste-based composite gelling material.

[0008] More optimally, the method for preparing the concrete is: take the solid waste-based composite cementitious material prepared according to claim 1, add gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball mill at 70-75°C for 50-60 minutes to obtain concrete.

[0009] More optimally, the concrete comprises the following components, by weight: 50-58 parts of solid waste-based composite cementitious material, 10-15 parts of fly ash, 6-10 parts of gypsum, 1-2 parts of quicklime, 5-10 parts of cement, and 3-5 parts of silica-carbon fiber composite.

[0010] More optimally, the preparation method of the silica-carbon fiber composite is: take modified carbon fiber and deionized water, ultrasonically disperse for 50-70 minutes, add dopamine, stir for 30-35 minutes, add tris(hydroxymethyl)aminomethane buffer, add hydrochloric acid, adjust the pH to 8.0-8.5, stir at 25-30°C for 20-24 hours, add copper-plated silica, stir at 25-30°C for 22-24 hours, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0011] More optimally, the preparation method of the modified carbon fiber is: take the pretreated carbon fiber and methanol, ultrasonically disperse, add methyl acrylate, heat to 50-55°C, stir for 10-14h, add ethylenediamine, stir, centrifuge, wash, and dry; add dimethyl sulfoxide, stir for 20-25min, heat to 70-75°C, add poly (ethylene glycol) methacrylate and lithium chloride, stir for 22-26h, centrifuge, wash, and dry to obtain modified carbon fiber.

[0012] More optimally, the preparation method of the pretreated carbon fiber is: take carbon fiber and toluene, ultrasonically disperse, pass nitrogen, add γ-aminopropyltriethoxysilane, heat to 100-105°C, stir for 20-22h, cool, centrifuge, wash, and dry to obtain pretreated carbon fiber.

[0013] More optimally, the mass ratio of the carbon fiber to γ-aminopropyltriethoxysilane is (5-6):8.5.

[0014] More optimally, the preparation method of the copper-plated silica is: take copper sulfate solution and sulfuric acid solution, stir evenly to obtain an electrolyte, add silica, stir evenly, and perform pulse electrophoretic deposition treatment. The deposition time is 30-40 minutes. The cathode is a copper alloy and the anode is pure titanium. After the pulse electrophoretic deposition is completed, wash and dry to obtain copper-plated silica.

[0015] More optimally, the slag powder is S95 grade blast furnace slag powder; and the cement is PO 42.5 cement.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention performs copper plating on silicon dioxide and then adds it to concrete to enhance the strength of the concrete.

[0018] 2. The present invention modifies carbon fibers by using methyl acrylate and poly(ethylene glycol) methacrylate, thereby enhancing the hydrophilicity of the modified carbon fibers and improving their compatibility with concrete, thereby reducing the porosity of the concrete and enhancing its strength.

[0019] 3. The present invention compounds copper-plated silica with modified carbon fiber, and also uses γ-aminopropyltriethoxysilane to modify carbide slag, fly ash, and silica fume to improve the dispersibility of the copper-plated silica, thereby improving the compatibility of the silica-carbon fiber composite in concrete and enhancing the strength of the concrete. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] The sources and models of the substances involved in the present invention are not particularly limited, and illustratively include: silicon dioxide: 10 nm, model: N10, which can be purchased from Ningbo Jinlei Nanomaterial Technology Co., Ltd.; carbon fiber: 100 nm×20-200 μm, model: 719803, which can be purchased from Merck; poly (ethylene glycol) methacrylate: model: 409537, which can be purchased from Merck.

[0022] Example 1: A method for preparing a solid waste-based composite cementitious material, comprising the following steps:

[0023] Step 1: Preparation of solid waste-based composite cementitious materials:

[0024] 38 g of carbide slag, 28 g of slag powder, and 4 g of silica fume were taken and ground to obtain a cementitious material; the cementitious material was added with 1000 mL of toluene and ultrasonically dispersed, and 15 g of γ-aminopropyltriethoxysilane was added, stirred for 21 h, centrifuged, washed, and dried to obtain a solid waste-based composite cementitious material;

[0025] Take solid waste-based composite cementitious material, add gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball mill at 72°C for 55 minutes to obtain concrete;

[0026] The concrete comprises the following components, calculated by weight: 55 parts of solid waste-based composite cementitious material, 12 parts of fly ash, 8 parts of gypsum, 1.5 parts of quicklime, 8 parts of cement, and 4 parts of silica-carbon fiber composite;

[0027] Step 2: Preparation of copper-plated silica:

[0028] 15 mL of 0.3 mol / L copper sulfate solution and 35 mL of 0.7 mol / L sulfuric acid solution were taken and stirred evenly to obtain an electrolyte, 2 mg / mL of silicon dioxide was added and stirred evenly, and pulse electrophoretic deposition was performed for 30 min. The cathode was a copper alloy and the anode was pure titanium. After the pulse electrophoretic deposition was completed, the copper-plated silicon dioxide was washed and dried to obtain;

[0029] Step 3: Preparation of modified carbon fiber:

[0030] Take 5 g of carbon fiber and 300 mL of toluene, ultrasonically disperse, pass nitrogen, add 8.5 g of γ-aminopropyltriethoxysilane, heat to 102 ° C, stir for 21 h, cool, centrifuge, wash, and dry to obtain pretreated carbon fiber;

[0031] Take the pretreated carbon fiber and 300 mL of methanol, ultrasonically disperse, add 1 g of methyl acrylate, heat to 52 ° C, stir for 12 h, add 1 g of ethylenediamine, stir, centrifuge, wash, and dry; add 300 mL of dimethyl sulfoxide, stir for 23 min, heat to 72 ° C, add 7.2 g of poly (ethylene glycol) methacrylate and 0.1 g of lithium chloride, stir for 24 h, centrifuge, wash, and dry to obtain modified carbon fiber;

[0032] Step 4: Preparation of silica-carbon fiber composite:

[0033] Take 25 g of modified carbon fiber and 1000 mL of deionized water, ultrasonically disperse for 60 min, add 0.5 g of dopamine, stir for 32 min, add 1.5 g of tris(hydroxymethyl)aminomethane) buffer, add hydrochloric acid, adjust the pH to 8.3, stir at 28 ° C for 22 h, add 6 g of copper-plated silica, stir at 28 ° C for 23 h, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0034] Example 2: A method for preparing a solid waste-based composite cementitious material, comprising the following steps:

[0035] Step 1: Preparation of solid waste-based composite cementitious materials:

[0036] 38 g of carbide slag, 28 g of slag powder, and 4 g of silica fume were taken and ground to obtain a gelling material; the gelling material was added with 1000 mL of toluene and ultrasonically dispersed, and 15 g of γ-aminopropyltriethoxysilane was added, stirred for 20 h, centrifuged, washed, and dried to obtain a solid waste-based composite gelling material;

[0037] Take solid waste-based composite cementitious material, add gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball mill at 70°C for 50 minutes to obtain concrete;

[0038] The concrete comprises the following components, calculated by weight: 50 parts of solid waste-based composite cementitious material, 12 parts of fly ash, 6 parts of gypsum, 1 part of quicklime, 5 parts of cement, and 3 parts of silica-carbon fiber composite;

[0039] Step 2: Preparation of copper-plated silica:

[0040] 15 mL of 0.3 mol / L copper sulfate solution and 35 mL of 0.7 mol / L sulfuric acid solution were taken and stirred evenly to obtain an electrolyte, 2 mg / mL of silicon dioxide was added and stirred evenly, and pulse electrophoretic deposition was performed for 30 min. The cathode was a copper alloy and the anode was pure titanium. After the pulse electrophoretic deposition was completed, the copper-plated silicon dioxide was washed and dried to obtain;

[0041] Step 3: Preparation of modified carbon fiber:

[0042] 5 g of carbon fiber and 300 mL of toluene were ultrasonically dispersed, nitrogen was passed through, 8.5 g of γ-aminopropyltriethoxysilane was added, the temperature was raised to 100 ° C, stirred for 20 h, cooled, centrifuged, washed, and dried to obtain the pretreated carbon fiber;

[0043] Take the pretreated carbon fiber and 300 mL of methanol, ultrasonically disperse, add 1 g of methyl acrylate, heat to 50 ° C, stir for 10 h, add 1 g of ethylenediamine, stir, centrifuge, wash, and dry; add 300 mL of dimethyl sulfoxide, stir for 20 min, heat to 70 ° C, add 7.2 g of poly (ethylene glycol) methacrylate and 0.1 g of lithium chloride, stir for 22 h, centrifuge, wash, and dry to obtain modified carbon fiber;

[0044] Step 4: Preparation of silica-carbon fiber composite:

[0045] Take 25 g of modified carbon fiber and 1000 mL of deionized water, ultrasonically disperse for 50 min, add 0.5 g of dopamine, stir for 30 min, add 1.5 g of tris(hydroxymethyl)aminomethane) buffer, add hydrochloric acid, adjust the pH to 8.0, stir at 25 ° C for 20 h, add 6 g of copper-plated silica, stir at 25 ° C for 22 h, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0046] Example 3: A method for preparing a solid waste-based composite cementitious material, comprising the following steps:

[0047] Step 1: Preparation of solid waste-based composite cementitious materials:

[0048] 38 g of carbide slag, 28 g of slag powder, and 4 g of silica fume were taken and ground to obtain a cementitious material; the cementitious material was added with 1000 mL of toluene and ultrasonically dispersed, and 15 g of γ-aminopropyltriethoxysilane was added, stirred for 22 h, centrifuged, washed, and dried to obtain a solid waste-based composite cementitious material;

[0049] Take solid waste-based composite cementitious material, add gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball mill at 75°C for 60 minutes to obtain concrete;

[0050] The concrete comprises the following components, calculated by weight: 58 parts of solid waste-based composite cementitious material, 12 parts of fly ash, 10 parts of gypsum, 2 parts of quicklime, 10 parts of cement, and 5 parts of silica-carbon fiber composite;

[0051] Step 2: Preparation of copper-plated silica:

[0052] 15 mL of 0.3 mol / L copper sulfate solution and 35 mL of 0.7 mol / L sulfuric acid solution were taken and stirred evenly to obtain an electrolyte, 2 mg / mL of silicon dioxide was added and stirred evenly, and pulse electrophoretic deposition was performed for 30 min. The cathode was a copper alloy and the anode was pure titanium. After the pulse electrophoretic deposition was completed, the copper-plated silicon dioxide was washed and dried to obtain;

[0053] Step 3: Preparation of modified carbon fiber:

[0054] Take 5 g of carbon fiber and 300 mL of toluene, ultrasonically disperse, pass nitrogen, add 8.5 g of γ-aminopropyltriethoxysilane, heat to 105 ° C, stir for 22 h, cool, centrifuge, wash, and dry to obtain pretreated carbon fiber;

[0055] Take the pretreated carbon fiber and 300 mL of methanol, ultrasonically disperse, add 1 g of methyl acrylate, heat to 55 ° C, stir for 14 h, add 1 g of ethylenediamine, stir, centrifuge, wash, and dry; add 300 mL of dimethyl sulfoxide, stir for 25 min, heat to 75 ° C, add 7.2 g of poly (ethylene glycol) methacrylate and 0.1 g of lithium chloride, stir for 26 h, centrifuge, wash, and dry to obtain modified carbon fiber;

[0056] Step 4: Preparation of silica-carbon fiber composite:

[0057] Take 25 g of modified carbon fiber and 1000 mL of deionized water, ultrasonically disperse for 70 min, add 0.5 g of dopamine, stir for 35 min, add 1.5 g of tris(hydroxymethyl)aminomethane) buffer, add hydrochloric acid, adjust the pH to 8.5, stir at 30 ° C for 24 h, add 6 g of copper-plated silica, stir at 30 ° C for 24 h, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0058] Comparative Example 1: No copper plating was performed on silicon dioxide, and the rest was the same as in Example 1:

[0059] Step 1: Preparation of solid waste-based composite cementitious materials:

[0060] 38 g of carbide slag, 28 g of slag powder, and 4 g of silica fume were taken and ground to obtain a cementitious material; the cementitious material was added with 1000 mL of toluene and ultrasonically dispersed, and 15 g of γ-aminopropyltriethoxysilane was added, stirred for 21 h, centrifuged, washed, and dried to obtain a solid waste-based composite cementitious material;

[0061] Take solid waste-based composite cementitious material, add gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball mill at 72°C for 55 minutes to obtain concrete;

[0062] The concrete comprises the following components, calculated by weight: 55 parts of solid waste-based composite cementitious material, 12 parts of fly ash, 8 parts of gypsum, 1.5 parts of quicklime, 8 parts of cement, and 4 parts of silica-carbon fiber composite;

[0063] Step 2: Preparation of modified carbon fiber:

[0064] Take 5 g of carbon fiber and 300 mL of toluene, ultrasonically disperse, pass nitrogen, add 8.5 g of γ-aminopropyltriethoxysilane, heat to 102 ° C, stir for 21 h, cool, centrifuge, wash, and dry to obtain pretreated carbon fiber;

[0065] Take the pretreated carbon fiber and 300 mL of methanol, ultrasonically disperse, add 1 g of methyl acrylate, heat to 52 ° C, stir for 12 h, add 1 g of ethylenediamine, stir, centrifuge, wash, and dry; add 300 mL of dimethyl sulfoxide, stir for 23 min, heat to 72 ° C, add 7.2 g of poly (ethylene glycol) methacrylate and 0.1 g of lithium chloride, stir for 24 h, centrifuge, wash, and dry to obtain modified carbon fiber;

[0066] Step 3: Preparation of silica-carbon fiber composite:

[0067] Take 25 g of modified carbon fiber and 1000 mL of deionized water, ultrasonically disperse for 60 min, add 0.5 g of dopamine, stir for 32 min, add 1.5 g of tris(hydroxymethyl)aminomethane) buffer, add hydrochloric acid, adjust the pH to 8.3, stir at 28 ° C for 22 h, add 6 g of silica, stir at 28 ° C for 23 h, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0068] Comparative Example 2: No modification was performed on the carbon fiber, and the rest was the same as in Example 1:

[0069] Step 1: Preparation of solid waste-based composite cementitious materials:

[0070] 38 g of carbide slag, 28 g of slag powder, and 4 g of silica fume were taken and ground to obtain a cementitious material; the cementitious material was added with 1000 mL of toluene and ultrasonically dispersed, and 15 g of γ-aminopropyltriethoxysilane was added, stirred for 21 h, centrifuged, washed, and dried to obtain a solid waste-based composite cementitious material;

[0071] Take solid waste-based composite cementitious material, add gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball mill at 72°C for 55 minutes to obtain concrete;

[0072] The concrete comprises the following components, calculated by weight: 55 parts of solid waste-based composite cementitious material, 12 parts of fly ash, 8 parts of gypsum, 1.5 parts of quicklime, 8 parts of cement, and 4 parts of silica-carbon fiber composite;

[0073] Step 2: Preparation of copper-plated silica:

[0074] 15 mL of 0.3 mol / L copper sulfate solution and 35 mL of 0.7 mol / L sulfuric acid solution were taken and stirred evenly to obtain an electrolyte, 2 mg / mL of silicon dioxide was added and stirred evenly, and pulse electrophoretic deposition was performed for 30 min. The cathode was a copper alloy and the anode was pure titanium. After the pulse electrophoretic deposition was completed, the copper-plated silicon dioxide was washed and dried to obtain;

[0075] Step 3: Preparation of silica-carbon fiber composite:

[0076] Take 25 g of carbon fiber and 1000 mL of deionized water, ultrasonically disperse for 60 minutes, add 0.5 g of dopamine, stir for 32 minutes, add 1.5 g of tris (hydroxymethyl)aminomethane buffer, add hydrochloric acid, adjust the pH to 8.3, stir at 28 ° C for 22 hours, add 6 g of copper-plated silica, stir at 28 ° C for 23 hours, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0077] Comparative Example 3: The copper-plated silica and the modified carbon fiber are not compounded together, and the rest is the same as Example 1:

[0078] Step 1: Solid waste-based composite cementitious materials:

[0079] 38 g of carbide slag, 28 g of slag powder, and 4 g of silica fume were taken and ground to obtain a cementitious material; the cementitious material was added with 1000 mL of toluene and ultrasonically dispersed, and 15 g of γ-aminopropyltriethoxysilane was added, stirred for 21 h, centrifuged, washed, and dried to obtain a solid waste-based composite cementitious material;

[0080] Solid waste-based composite cementitious materials were added with gypsum, quicklime, cement, fly ash, copper-coated silica, and modified carbon fiber, and ball-milled at 72°C for 55 min to obtain concrete;

[0081] The concrete comprises the following components, calculated by weight: 55 parts of solid waste-based composite cementitious material, 12 parts of fly ash, 8 parts of gypsum, 1.5 parts of quicklime, 8 parts of cement, 1 part of copper-coated silica, and 3 parts of modified carbon fiber;

[0082] Step 2: Preparation of copper-plated silica:

[0083] 15 mL of 0.3 mol / L copper sulfate solution and 35 mL of 0.7 mol / L sulfuric acid solution were taken and stirred evenly to obtain an electrolyte, 2 mg / mL of silicon dioxide was added and stirred evenly, and pulse electrophoretic deposition was performed for 30 min. The cathode was a copper alloy and the anode was pure titanium. After the pulse electrophoretic deposition was completed, the copper-plated silicon dioxide was washed and dried to obtain;

[0084] Step 3: Preparation of modified carbon fiber:

[0085] Take 5 g of carbon fiber and 300 mL of toluene, ultrasonically disperse, pass nitrogen, add 8.5 g of γ-aminopropyltriethoxysilane, heat to 102 ° C, stir for 21 h, cool, centrifuge, wash, and dry to obtain pretreated carbon fiber;

[0086] Take the pretreated carbon fiber and 300 mL of methanol, ultrasonically disperse them, add 1 g of methyl acrylate, heat to 52 ° C, stir for 12 h, add 1 g of ethylenediamine, stir, centrifuge, wash, and dry; add 300 mL of dimethyl sulfoxide, stir for 23 min, heat to 72 ° C, add 7.2 g of poly (ethylene glycol) methacrylate and 0.1 g of lithium chloride, stir for 24 h, centrifuge, wash, and dry to obtain modified carbon fiber.

[0087] Example 4: The gelling material is not treated, and the rest is the same as Example 1:

[0088] Step 1: Preparation of solid waste-based composite cementitious materials:

[0089] 38g of carbide slag, 28g of slag powder, and 4g of silica fume were taken and ground to obtain a cementitious material; the cementitious material was added with gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball milled at 72°C for 55min to obtain a solid waste-based composite cementitious material;

[0090] The solid waste-based composite cementitious material comprises the following components, calculated by weight: 55 parts of cementitious material, 12 parts of fly ash, 8 parts of gypsum, 1.5 parts of quicklime, 8 parts of cement, and 4 parts of silica-carbon fiber composite;

[0091] Step 2: Preparation of copper-plated silica:

[0092] 15 mL of 0.3 mol / L copper sulfate solution and 35 mL of 0.7 mol / L sulfuric acid solution were taken and stirred evenly to obtain an electrolyte, 2 mg / mL of silicon dioxide was added and stirred evenly, and pulse electrophoretic deposition was performed for 30 min. The cathode was a copper alloy and the anode was pure titanium. After the pulse electrophoretic deposition was completed, the copper-plated silicon dioxide was washed and dried to obtain;

[0093] Step 3: Preparation of modified carbon fiber:

[0094] Take 5 g of carbon fiber and 300 mL of toluene, ultrasonically disperse, pass nitrogen, add 8.5 g of γ-aminopropyltriethoxysilane, heat to 102 ° C, stir for 21 h, cool, centrifuge, wash, and dry to obtain pretreated carbon fiber;

[0095] Take the pretreated carbon fiber and 300 mL of methanol, ultrasonically disperse, add 1 g of methyl acrylate, heat to 52 ° C, stir for 12 h, add 1 g of ethylenediamine, stir, centrifuge, wash, and dry; add 300 mL of dimethyl sulfoxide, stir for 23 min, heat to 72 ° C, add 7.2 g of poly (ethylene glycol) methacrylate and 0.1 g of lithium chloride, stir for 24 h, centrifuge, wash, and dry to obtain modified carbon fiber;

[0096] Step 4: Preparation of silica-carbon fiber composite:

[0097] Take 25 g of modified carbon fiber and 1000 mL of deionized water, ultrasonically disperse for 60 min, add 0.5 g of dopamine, stir for 32 min, add 1.5 g of tris(hydroxymethyl)aminomethane) buffer, add hydrochloric acid, adjust the pH to 8.3, stir at 28 ° C for 22 h, add 6 g of copper-plated silica, stir at 28 ° C for 23 h, centrifuge, wash, and dry to obtain a silica-carbon fiber composite.

[0098] experiment:

[0099] The concrete prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was used to prepare 40 mm × 40 mm × 40 mm slurry specimens according to a water-binder ratio of 0.5. The specimens were cured under standard curing conditions and tested for 28-day compressive strength. The data obtained are shown in Table 1 below:

[0100] Table 1

[0101]

[0102] Conclusion: From the comparison of the data in the table, it can be seen that in Example 1, the silica is not copper-plated, and the strength of the concrete decreases. In Example 2, the carbon fiber is not modified, the compatibility of the carbon fiber with the concrete base material is poor, and the compressive strength decreases. In Example 3, the copper-plated silica is not compounded with the modified carbon fiber, and the strength of the concrete base material decreases. In Example 4, the cementitious material is not treated, the filler has poor compatibility with the concrete base material, and the compressive strength decreases. In Examples 1 to 3 of the present invention, the silica is copper-plated and then added to the concrete, which enhances the strength of the concrete. By modifying the carbon fiber using methyl acrylate and poly (ethylene glycol) methacrylate, the hydrophilicity of the modified carbon fiber is enhanced, and its compatibility with the concrete base material is improved, thereby reducing the porosity of the concrete base material and enhancing its strength. In Examples 1 to 3 of the present invention, copper-plated silica is compounded with modified carbon fiber, and γ-aminopropyltriethoxysilane is used to modify carbide slag, fly ash, and silica fume to improve the dispersibility of the copper-plated silica, thereby improving the compatibility of the silica-carbon fiber composite in the concrete base material and enhancing the strength of the concrete base material.

[0103] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A method for preparing a solid waste-based composite gelling material, characterized by: The preparation method of the solid waste-based composite gelling material comprises the following steps: taking carbide slag, slag powder and silica fume, grinding them to obtain a gelling material; taking the gelling material, adding toluene, ultrasonically dispersing it, adding γ-aminopropyltriethoxysilane, stirring for 20-22 hours, centrifuging, washing and drying to obtain the solid waste-based composite gelling material.

2. A method for preparing concrete, characterized in that: The preparation method of the concrete is: taking the solid waste-based composite cementitious material prepared according to claim 1, adding gypsum, quicklime, cement, fly ash, and silica-carbon fiber composite, and ball milling at 70-75° C. for 50-60 minutes to obtain concrete.

3. The concrete according to claim 2, characterized in that: The concrete comprises the following components by weight: 50-58 parts of solid waste-based composite cementitious material, 10-15 parts of fly ash, 6-10 parts of gypsum, 1-2 parts of quicklime, 5-10 parts of cement, and 3-5 parts of silicon dioxide-carbon fiber composite.

4. The concrete according to claim 3, characterized in that: The preparation method of the silica-carbon fiber composite comprises: taking modified carbon fiber and deionized water, ultrasonically dispersing for 50-70 minutes, adding dopamine, stirring for 30-35 minutes, adding tris(hydroxymethyl)aminomethane buffer, adding hydrochloric acid, adjusting the pH to 8.0-8.5, stirring at 25-30° C. for 20-24 hours, adding copper-plated silica, stirring at 25-30° C. for 22-24 hours, centrifuging, washing, and drying to obtain the silica-carbon fiber composite.

5. The concrete according to claim 4, characterized in that: The modified carbon fiber preparation method comprises the following steps: taking pretreated carbon fiber and methanol, performing ultrasonic dispersion, adding methyl acrylate, heating to 50-55° C., stirring for 10-14 hours, adding ethylenediamine, stirring, centrifuging, washing, and drying; adding dimethyl sulfoxide, stirring for 20-25 minutes, heating to 70-75° C., adding poly(ethylene glycol) methacrylate and lithium chloride, stirring for 22-26 hours, centrifuging, washing, and drying to obtain the modified carbon fiber.

6. The concrete according to claim 5, characterized in that: The preparation method of the pretreated carbon fiber comprises: taking carbon fiber and toluene, ultrasonically dispersing, passing nitrogen, adding γ-aminopropyltriethoxysilane, heating to 100-105° C., stirring for 20-22 hours, cooling, centrifuging, washing, and drying to obtain the pretreated carbon fiber.

7. The concrete according to claim 6, characterized in that: The mass ratio of the carbon fiber to γ-aminopropyltriethoxysilane is (5-6):8.

5.

8. The concrete according to claim 4, characterized in that: The preparation method of the copper-plated silica comprises the following steps: taking a copper sulfate solution and a sulfuric acid solution, stirring them evenly to obtain an electrolyte, adding silica, stirring them evenly, and performing a pulse electrophoretic deposition treatment for 30-40 minutes, wherein the cathode is a copper alloy and the anode is pure titanium. After the pulse electrophoretic deposition is completed, the copper-plated silica is washed and dried to obtain the copper-plated silica.

9. Concrete prepared according to the method for preparing concrete according to any one of claims 2 to 8.

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