Preparation method and application of carbon sequestration concrete reclaimed material high-elasticity powder cementing material

Abstract

The invention relates to the technical field of concrete reclaimed materials, in particular to a preparation method and application of a carbon sequestration concrete reclaimed material high-elasticity powder cementing material. Comprising the following raw materials in parts by weight: 45-80 parts of a composite material and 900-1000 parts of a regenerated material, and the regenerated material comprises 250-385 parts of a regenerated coarse material A, 250-485 parts of a regenerated coarse material B, 60-185 parts of calcium waste residues, 80-205 parts of siliceous waste residues and 15-95 parts of epoxy resin modified glass fibers; the composite material is prepared by mixing a sulfur-aluminum-iron binding material, a modified magnesium oxychloride binding material and an auxiliary agent, the recycled coarse material A is concrete recycled coarse aggregate, and the recycled coarse material B is tile recycled coarse aggregate. The prepared carbon sequestration concrete reclaimed material high-elasticity powder cementing material can greatly improve the impact resistance and collision resistance of parts such as a bridge anti-collision wall and the like, and remarkably improve the corrosion resistance, crack resistance and collision resistance of medium-strength and low-strength-grade concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of recycled concrete materials, and more specifically, to a preparation method and application of a carbon-fixing concrete recycled material high-elastic powder cementitious material. Background Art

[0002] Solid waste-based cementitious materials are made entirely of industrial solid waste from the metallurgical and coal-fired power industries, such as steel slag, slag, and desulfurized gypsum. They do not consume natural mineral resources, do not require high-temperature calcination, do not decompose carbonate raw materials, and do not use alkali excitation. They have similar cementitious properties to traditional cement. Compared with traditional cement clinker, each ton of solid waste-based cementitious materials can reduce CO2 emissions by more than 0.5 tons, and production energy consumption can be reduced by more than 75%, with significant advantages in energy conservation and emission reduction. However, solid waste-based cementitious materials in the prior art face the performance defects of low early strength and slow hydration rate, especially in low-temperature environments, which increases the complexity of construction in low-temperature environments and limits the application of low-carbon cementitious materials in low-temperature environments.

[0003] In the prior art, the elasticity of reclaimed rubber is usually poor, and even after vulcanization, it cannot recover to its original elasticity level. During storage, the Mooney viscosity of reclaimed rubber is prone to increase, which leads to processing difficulties, high energy consumption, and easy rubber deadness. Summary of the invention

[0004] The present invention provides a method for preparing a carbon-fixing concrete recycled material high-elastic powder cementitious material. The prepared carbon-fixing concrete recycled material high-elastic powder cementitious material can greatly improve the impact and collision resistance of parts such as bridge crash barriers, significantly improve the corrosion resistance, crack resistance and collision resistance of medium and low strength grade concrete, significantly reduce the comprehensive cost of concrete, and improve the quality of concrete.

[0005] In a first aspect, the present invention provides a carbon-fixing concrete recycled material high-elastic powder cementitious material, comprising the following raw materials in parts by weight: 45-80 parts of composite materials and 900-1000 parts of recycled materials, wherein the recycled materials include 250-385 parts of recycled coarse material A, 250-485 parts of recycled coarse material B, 60-185 parts of calcareous waste slag, 80-205 parts of siliceous waste slag, 15-95 parts of epoxy resin modified glass fiber, and 60-75 parts of acrylic emulsion.

[0006] Preferably, the raw materials include the following parts by weight: 50-80 parts of composite materials and 950-1000 parts of recycled materials, the recycled materials include 300-385 parts of recycled coarse material A, 280-485 parts of recycled coarse material B, 80-185 parts of calcareous waste residue, 100-205 parts of siliceous waste residue, 35-95 parts of epoxy resin modified glass fiber, and 65-75 parts of acrylic emulsion.

[0007] Preferably, it comprises raw materials in the following parts by weight: 80 parts of composite material and 900 parts of recycled material. The recycled material includes 500 parts of recycled coarse material A, 400 parts of recycled coarse material B, 125 parts of calcium waste residue, 150 parts of silicon waste residue, 62 parts of epoxy resin modified glass fiber, and 68 parts of acrylic emulsion.

[0008] Preferably, the calcium waste residue includes calcium oxide, calcium hydroxide, calcium carbonate, calcium sulfate, and also contains a small amount of silicon dioxide, bauxite, and iron oxide. The silicon waste residue includes silicon dioxide, calcium oxide, iron oxide, aluminum oxide, and sodium oxide.

[0009] Preferably, the composite material includes a sulfoaluminate-based cementitious material, a modified magnesium oxychloride cementitious material, and an additive. The mass ratio of the sulfoaluminate-based cementitious material, the modified magnesium oxychloride cementitious material, and the additive is 1 - 2:2 - 5:1 - 2; the additive is an activator, a curing agent, and an admixture. The mass ratio of the activator, the curing agent, and the admixture is 1 - 5:2 - 3:3 - 8; the activator is a mixed solution of sodium silicate and sodium hydroxide in a mass ratio of 1 - 3:1 - 2.

[0010] Preferably, the modified magnesium oxychloride cementitious material is prepared by repairing and activating the surface hydroxyl groups of nano-silica with hydrogen peroxide, and loading chitosan phosphate onto the surface of nano-silica through intermolecular dehydration to prepare nano-silica @ chitosan phosphate, and then adding nano-silica @ chitosan phosphate to the magnesium oxychloride cementitious material for modification; the molar ratio of the nano-silica, chitosan phosphate, and magnesium oxychloride cementitious material is 3 - 7:1 - 2:12 - 15.

[0011] Preferably, the epoxy resin modified glass fiber is prepared by curing epoxy resin and a curing agent in a mass ratio of 5 - 10:1 and then adding it to the glass fiber.

[0012] Preferably, the sulfoaluminate-based cementitious material is one of anhydrous calcium sulfoaluminate and dicalcium silicate.

[0013] Preferably, the admixture is one or more of carbon nanotubes, glass fiber powder, resin powder, and sludge residue.

[0014] Preferably, the particle size of the carbon nanotubes is 8 - 15 µm; the fineness of the glass fiber powder is 120 - 250 mesh.

[0015] Preferably, the curing agent is mineral powder and waste gypsum. The mineral powder is obtained by subjecting water-quenched blast furnace slag to drying and grinding processes. The mass ratio of the mineral powder and the waste gypsum is 1 - 2:1 - 5.

[0016] Second, the present invention provides a preparation method of a high-elastic powder cementitious material for a carbon sequestration concrete recycled material, comprising the following steps: (1) Preparation of raw materials: Weigh 45 - 80 parts of composite materials and 900 - 1000 parts of recycled materials. The recycled materials include 250 - 385 parts of recycled coarse material A, 250 - 485 parts of recycled coarse material B, 60 - 185 parts of calcium - containing waste residue, 80 - 205 parts of silicon - containing waste residue, 15 - 95 parts of epoxy - resin - modified glass fiber, and 60 - 75 parts of acrylic emulsion. (2) Pretreatment of raw materials: Grind and sieve the composite materials and recycled materials to obtain corresponding powders. (3) Add 10% - 15% deionized water or absolute ethanol, stir evenly, press - mold at a pressure of 5 - 30 MPa, place in an oven at 80 - 105 °C and bake for 6 - 12 h until constant weight, then pre - burn and calcine in a muffle furnace, cool, and ball - mill and sieve to obtain a high - elasticity powder gelling material of carbon - sequestration concrete recycled materials.

[0017] Preferably, in step (1), the particle size of recycled coarse material A is 10 - 35 mm, and the particle size of recycled coarse material B is 5 - 10 mm. In step (3), the calcination process in the muffle furnace: heat up to 1100 - 1250 °C at a rate of 8 - 20 °C / min and hold for 1 - 3 h.

[0018] In the third aspect, the present invention provides an application of a high - elasticity powder gelling material of carbon - sequestration concrete recycled materials. The high - elasticity powder gelling material of carbon - sequestration concrete recycled materials is used in industrial and civil buildings, bridge engineering, railway engineering, high - strength concrete, high - performance concrete, and anti - collision concrete.

[0019] In summary, the present invention has the following beneficial effects: 0. The high - elasticity powder gelling material of carbon - sequestration concrete recycled materials prepared in the present invention has hydration and hardening characteristics similar to those of cement, which is essentially different from admixtures such as mineral powder and fly ash that do not have self - hardening properties, and at the same time has advantageous characteristics that traditional cement does not have. Higher toughness, the flexural - compression ratio of traditional cement is 0.17 - 0.22, and the flexural - compression ratio of the large - powder gelling material is 0.20 - 0.31. Low heat of hydration, only 50% of that of traditional cement, especially suitable for mass concrete. Strong resistance to chemical erosion, especially suitable for marine engineering applications and multi - coupled complex service environments. Suitable for ecological restoration of non - ferrous metal mines, heavy metal pollution control, and disposal of waste incineration fly ash. Low - carbon and energy - saving, with carbon emissions only 10% of those of traditional cement and energy consumption only 20% of that of traditional cement.

[0020] 1. In the present invention, epoxy resin is added to modify glass fiber. The glass fiber composite material is composed of glass fiber and an epoxy resin matrix. High-strength alkali-free glass fiber is selected as the glass fiber, and a low-viscosity and high-toughness epoxy resin system is selected as the epoxy resin matrix, ensuring that the material has excellent adhesiveness and durability after curing, improving the elasticity of the high-elastic powder cementitious material made from carbon sequestration concrete recycled material, increasing the anti-collision ability of the concrete, and reducing the impact damage degree of concrete buildings. The acrylic emulsion can fill pores to form a flexible film, improving flexibility and crack resistance, and thus significantly improving the elasticity of the high-elastic powder cementitious material made from carbon sequestration concrete recycled material and enhancing the impermeability.

[0021] 3. The high-elastic powder cementitious material made from carbon sequestration concrete recycled material prepared by the present invention and other admixtures improve the maximum dry density of sandy soil and reduce the optimum moisture content. The compaction performance of solidified soil is improved, the grading is optimized, and the combined cementitious material of glass fiber powder and oily sludge residue has a better improvement effect on the compaction performance of sandy soil.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the protection scope of the present invention. Detailed implementation manners

[0023] The present invention will be further described in detail below in conjunction with embodiments. It should be specially noted that: for those conditions not specified in the following embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. Except as otherwise specified, the raw materials used in the following embodiments can all be obtained from ordinary commercial sources.

[0024] Embodiments Embodiment 1 A high-elastic powder cementitious material made from carbon sequestration concrete recycled material comprises the following raw materials in parts by weight: 45 parts of composite material and 900 parts of recycled material. The recycled material includes 250 parts of recycled coarse aggregate A, 650 parts of recycled coarse aggregate B, 60 parts of calcareous waste residue, 80 parts of siliceous waste residue, 15 parts of epoxy resin-modified glass fiber, and 60 parts of acrylic emulsion.

[0025] The composite material includes a sulphoaluminate-iron-based cementitious material, a modified magnesium oxychloride cementitious material, and an additive. The mass ratio of the sulphoaluminate-iron-based cementitious material, the modified magnesium oxychloride cementitious material, and the additive is 1:2:1; the additive is an activator, a curing agent, and an admixture, and the mass ratio of the activator, the curing agent, and the admixture is 1:2:3; the activator is a mixed solution of water glass and sodium hydroxide in a mass ratio of 1:1; The modified magnesium oxychloride cementitious material repairs and activates the surface hydroxyl groups of nano-silica with hydrogen peroxide, and nano-silica@chitosan phosphate is prepared by loading chitosan phosphate onto the surface of nano-silica through intermolecular dehydration. The nano-silica@chitosan phosphate is added to the magnesium oxychloride cementitious material for modification; the molar ratio of the nano-silica, chitosan phosphate and magnesium oxychloride cementitious material is 3:1:13; the sulphoaluminate-ferrite cementitious material is anhydrous calcium sulphoaluminate; the admixture is carbon nanotubes with a particle size of 10 µm; the curing agent is mineral powder and waste gypsum. The mineral powder is obtained by treating water-quenched blast furnace slag through drying and grinding processes, and the mass ratio of the mineral powder to the waste gypsum is 2:5; The epoxy resin modified glass fiber is prepared by curing epoxy resin and a curing agent according to a mass ratio of 10:1 and then adding it to the glass fiber.

[0026] A preparation method of a high-elastic powder cementitious material for carbon sequestration concrete recycled materials comprises the following steps: (1) Preparation of raw materials, weighing the raw materials. The particle size of the recycled coarse material A is 18 mm, and the particle size of the recycled coarse material B is 5 mm; (2) Pretreatment of raw materials, grinding and sieving the composite material and the recycled materials to obtain the corresponding powders; (3) Adding 15% deionized water or absolute ethanol, stirring evenly, pressing into a mold under a pressure of 30 MPa, drying in an oven at 105 °C for 12 h until constant weight, pre-burning, calcining in a muffle furnace, and cooling. The calcining process in the muffle furnace: heating to 1100 °C at a rate of 10 °C / min, holding for 1 h, and ball milling and sieving to obtain the high-elastic powder cementitious material for carbon sequestration concrete recycled materials.

[0027] Example 2 A high-elastic powder cementitious material for carbon sequestration concrete recycled materials comprises the following raw materials in parts by weight: 55 parts of a composite material and 900 parts of recycled materials. The recycled materials include 300 parts of recycled coarse material A, 600 parts of recycled coarse material B, 155 parts of calcareous waste residue, 160 parts of siliceous waste residue, 32 parts of epoxy resin modified glass fiber, and 62 parts of acrylic emulsion.

[0028] The composite material comprises a sulphoaluminate-ferrite cementitious material, a modified magnesium oxychloride cementitious material and an additive. The mass ratio of the sulphoaluminate-ferrite cementitious material, the modified magnesium oxychloride cementitious material and the additive is 2:3:1; the additive is an activator, a curing agent and an admixture. The mass ratio of the activator, the curing agent and the admixture is 3:2:5; the activator is a mixed solution of water glass and sodium hydroxide according to a mass ratio of 2:1; The modified magnesium oxychloride cementitious material repairs and activates the surface hydroxyl groups of nano-silica with hydrogen peroxide, and nano-silica@chitosan phosphate is prepared by loading chitosan phosphate onto the surface of nano-silica through intermolecular dehydration. The nano-silica@chitosan phosphate is added to the magnesium oxychloride cementitious material for modification; the molar ratio of nano-silica, chitosan phosphate and magnesium oxychloride cementitious material is 3:1:14; the sulfoaluminate-iron-based cementitious material is anhydrous calcium sulfoaluminate; the admixture is carbon nanotubes, and the particle size of the carbon nanotubes is 15 µm; the curing agent is mineral powder and waste gypsum. The mineral powder is obtained by subjecting water-quenched blast furnace slag to drying and grinding processes, and the mass ratio of the mineral powder to the waste gypsum is 2:5; The epoxy resin-modified glass fiber is prepared by curing epoxy resin and a curing agent in a mass ratio of 10:1 and then adding them to the glass fiber.

[0029] A preparation method of a high-elastic powder cementitious material for carbon sequestration concrete recycled materials comprises the following steps: (1) Preparation of raw materials, weighing the raw materials. The particle size of recycled coarse material A is 20 mm, and the particle size of recycled coarse material B is 10 mm; (2) Pretreatment of raw materials, grinding and sieving the composite material and the recycled materials to obtain corresponding powders; (3) Adding 15% deionized water or absolute ethanol, stirring evenly, pressing into a mold under a pressure of 20 MPa, drying in an oven at 80 °C for 6 h until constant weight, pre-burning and calcining in a muffle furnace, and cooling. The calcination process in the muffle furnace: heating to 1100 °C at a rate of 15 °C / min, holding for 1 h, and ball milling and sieving to obtain the high-elastic powder cementitious material for carbon sequestration concrete recycled materials.

[0030] Example 3 A high-elastic powder cementitious material for carbon sequestration concrete recycled materials comprises the following raw materials in parts by weight: 80 parts of composite material and 1000 parts of recycled materials. The recycled materials include 650 parts of recycled coarse material A, 450 parts of recycled coarse material B, 168 parts of calcareous waste residue, 120 parts of siliceous waste residue, 95 parts of epoxy resin-modified glass fiber, and 65 parts of acrylic emulsion.

[0031] The composite material includes a sulfoaluminate-iron-based cementitious material, a modified magnesium oxychloride cementitious material and an additive. The mass ratio of the sulfoaluminate-iron-based cementitious material, the modified magnesium oxychloride cementitious material and the additive is 2:2:1; the additive is an activator, a curing agent and an admixture. The mass ratio of the activator, the curing agent and the admixture is 3:2:3; the activator is a mixed solution of water glass and sodium hydroxide in a mass ratio of 3:1; The modified magnesium oxychloride cementitious material repairs and activates the surface hydroxyl groups of nano-silica with hydrogen peroxide, and nano-silica@chitosan phosphate is prepared by loading chitosan phosphate onto the surface of nano-silica through intermolecular dehydration. The nano-silica@chitosan phosphate is added to the magnesium oxychloride cementitious material for modification; the molar ratio of nano-silica, chitosan phosphate and magnesium oxychloride cementitious material is 7:1:12; the sulphoaluminate-ferrite cementitious material is anhydrous calcium sulphoaluminate; the admixture is carbon nanotubes with a particle size of 8 µm; the curing agent is mineral powder and waste gypsum, and the mineral powder is obtained by subjecting water-quenched blast furnace slag to drying and grinding processes. The mass ratio of mineral powder to waste gypsum is 2:5; Epoxy resin modified glass fiber is prepared by curing epoxy resin and a curing agent according to a mass ratio of 8:1 and then adding it to glass fiber.

[0032] A preparation method of a high-elastic powder cementitious material for carbon sequestration concrete recycled materials comprises the following steps: (1) Preparation of raw materials: Weigh the raw materials. The particle size of recycled coarse material A is 30 mm, and the particle size of recycled coarse material B is 10 mm; (2) Pretreatment of raw materials: Grind and screen the composite material and recycled materials to obtain corresponding powders; (3) Add 15% deionized water or absolute ethanol, stir evenly, press and form at a pressure of 30 MPa, place in an oven at 105 °C and bake for 12 h until constant weight, then pre-burn and calcine in a muffle furnace, and cool. The calcination process in the muffle furnace: heat up to 1250 °C at a rate of 20 °C / min, keep warm for 3 h, and ball mill and screen to obtain the high-elastic powder cementitious material for carbon sequestration concrete recycled materials.

[0033] Example 4 A high-elastic powder cementitious material for carbon sequestration concrete recycled materials comprises the following raw materials in parts by weight: 80 parts of composite material and 1000 parts of recycled materials. The recycled materials include 500 parts of recycled coarse material A, 500 parts of recycled coarse material B, 60 parts of calcareous waste residue, 155 parts of siliceous waste residue, 95 parts of epoxy resin modified glass fiber, and 68 parts of acrylic emulsion.

[0034] The composite material includes a sulphoaluminate-ferrite cementitious material, a modified magnesium oxychloride cementitious material and an additive. The mass ratio of the sulphoaluminate-ferrite cementitious material, the modified magnesium oxychloride cementitious material and the additive is 2:5:2; the additive is an activator, a curing agent and an admixture, and the mass ratio of the activator, the curing agent and the admixture is 5:3:8; the activator is a mixed solution of water glass and sodium hydroxide according to a mass ratio of 3:2; The modified magnesium oxychloride cementitious material repairs and activates the surface hydroxyl groups of nano-silica with hydrogen peroxide, and nano-silica@chitosan phosphate is prepared by loading chitosan phosphate onto the surface of nano-silica through intermolecular dehydration. The nano-silica@chitosan phosphate is added to the magnesium oxychloride cementitious material for modification; the molar ratio of nano-silica, chitosan phosphate and magnesium oxychloride cementitious material is 5:2:12; the sulphoaluminate-ferrite cementitious material is anhydrous calcium sulphoaluminate; the admixture is carbon nanotubes with a particle size of 12 µm; the curing agent is mineral powder and waste gypsum. The mineral powder is obtained by quenching blast furnace slag, followed by drying and grinding processes. The mass ratio of mineral powder to waste gypsum is 2:3; Epoxy resin modified glass fiber is prepared by curing epoxy resin and curing agent according to a mass ratio of 10:1 and then adding it to glass fiber.

[0035] A preparation method of a high-elastic powder cementitious material for carbon sequestration concrete recycled materials includes the following steps: (1) Preparation of raw materials: Weigh the raw materials. The particle size of recycled coarse material A is 35 mm, and the particle size of recycled coarse material B is 5 mm; (2) Pretreatment of raw materials: Grind and screen the composite material and recycled materials to obtain the corresponding powders; (3) Add 15% deionized water or absolute ethanol, stir evenly, press into shape under a pressure of 25 MPa, place in an oven at 105 °C and bake for 12 h until constant weight, then pre-calcine and calcine in a muffle furnace, cool. The calcination process in the muffle furnace: heat up to 1250 °C at a rate of 20 °C / min, hold for 3 h, and ball mill and screen to obtain the high-elastic powder cementitious material for carbon sequestration concrete recycled materials.

[0036] Comparative Example 1 Prepared according to the same preparation method as in Example 1, except that the composite material is not added.

[0037] Comparative Example 2 Prepared according to the same preparation method as in Example 1, except that the modified magnesium oxychloride cementitious material is not added to the composite material.

[0038] Comparative Example 3 Prepared according to the same preparation method as in Example 1, except that the activator is not added to the composite material.

[0039] Performance test 1. Compressive strength: According to the national standard of GB / T50081 "Test Methods for Physical and Mechanical Properties of Concrete", the compressive strength of the cementitious materials prepared in Examples 1-4 and Comparative Examples 1-3 added to concrete is tested.

[0040] 2. Spread: The cementitious materials prepared by adding the examples 1-4 and comparative examples 1-3 to the concrete were loaded into the slump cone in three layers, and each layer was tamped 25 times with a tamper. Then, the slump cone was lifted, and the spread of the concrete was measured. The spread value is usually recorded in millimeters.

[0041] 3. In the large powder cementitious material concrete examples, the corrosion resistance coefficients were all greater than 0.7 after the corrosion resistance coefficient test, and the highest reached 0.9. Compared with the comparative examples, the corrosion resistance coefficient was significantly improved, indicating that the large powder elastic cementitious material has strong corrosion resistance.

[0042] 4. Elasticity test of large powder cementitious material: a) The elastic ball is a complete sphere with no holes on the surface; the specified sphere diameter is 200 mm ± 10 mm; the specified sphere weight does not exceed 6000 g; b) Elasticity test: A steel plate with a thickness of 40 mm and a square shape of 500 mm (or a circular shape with a diameter of 500 mm) is horizontally set on the ground (the steel plate is anchored on a 500 mm thick UHPC pier). The elastic ball freely falls from a height of 2000 mm and impacts the ground steel plate, and the rebound height is recorded (accurate to cm, recorded by slow-motion video and determined by playback). The elasticity of the elastic ball is characterized by the rebound height (H: mm).

[0043] After testing, the rebound height of the small balls made of the large powder cementitious material products was significantly different from that of the small balls in the comparative examples after 28 days of standard curing, indicating that the small balls made of the large powder material have excellent self-elasticity.

[0044] Table 1 Performance test results As can be seen from Table 1, the carbon-fixing concrete recycled high-elastic powder cementitious materials prepared in Examples 1-4 have hydration and hardening characteristics similar to those of cement, which are essentially different from admixtures such as mineral powder and fly ash that do not have self-hardening properties. At the same time, they have advantageous characteristics that traditional cement does not have. Higher toughness, the flexural-compressive ratio of traditional cement is 0.17 - 0.22, and the flexural-compressive ratio of the large powder cementitious material is 0.20 - 0.31. The hydration heat is low, only 50% of that of traditional cement, and it is especially suitable for mass concrete. It has strong resistance to chemical erosion and is especially suitable for marine engineering applications and multi-coupled complex service environments. It is applicable to fields such as ecological restoration of non-ferrous metal mines, treatment of heavy metal pollution, and disposal of municipal solid waste incineration fly ash. Low-carbon and energy-saving, the carbon emissions are only 10% of those of traditional cement, and the energy consumption is only 20% of that of traditional cement.

[0045] As described above, the above are only exemplary specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A carbon-fixing concrete recycled material with high elasticity powder cementitious material, characterized in that: The invention comprises the following raw materials in parts by weight: 45-80 parts of composite materials and 900-1000 parts of recycled materials, wherein the recycled materials comprise 250-385 parts of recycled coarse material A, 250-485 parts of recycled coarse material B, 60-185 parts of calcareous waste residue, 80-205 parts of siliceous waste residue, 15-95 parts of epoxy resin modified glass fiber and 60-75 parts of acrylic emulsion; the composite material is prepared by mixing sulphur-aluminium-iron cementitious material, modified magnesium oxychloride cementitious material and additives, the recycled coarse material A is recycled coarse aggregate for concrete, and the recycled coarse material B is recycled coarse aggregate for bricks and tiles.

2. According to claim 1, the carbon-fixing concrete recycled material high elastic powder cementitious material is characterized in that: The composite material includes a sulphur-aluminum-iron gelling material, a modified magnesium oxychloride gelling material and an auxiliary agent, wherein the mass ratio of the sulphur-aluminum-iron gelling material, the modified magnesium oxychloride gelling material and the auxiliary agent is 1-2:2-5:1-2; the auxiliary agent includes an activator, a curing agent and an additive, wherein the mass ratio of the activator, the curing agent and the additive is 1-5:2-3:3-8; the activator is a mixed solution of water glass and sodium hydroxide in a mass ratio of 1-3:1-2.

3. The carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 2 is characterized in that: The modified magnesium oxychloride gelling material is prepared by repairing and activating the surface hydroxyl groups of nano-silica with hydrogen peroxide, loading chitosan phosphate onto the surface of nano-silica through intermolecular dehydration, and adding nano-silica @ chitosan phosphate to the magnesium oxychloride gelling material for modification; the molar ratio of the nano-silica, chitosan phosphate and magnesium oxychloride gelling material is 3-7:1-2:12-15.

4. The carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 2 is characterized in that: Epoxy resin modified glass fiber is prepared by curing epoxy resin and curing agent in a mass ratio of 5-10:1 and then adding the cured epoxy resin to glass fiber. The sulfoaluminum-iron cementitious material is one of anhydrous calcium sulfoaluminate and dicalcium silicate.

5. The carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 2 is characterized in that: The additive is one or more of carbon nanotubes, glass fiber powder, resin powder and oil sludge residue.

6. The carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 5, characterized in that: The particle size of carbon nanotubes is 8µm-15µm; the fineness of glass fiber powder is 120 mesh-250 mesh.

7. The carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 2, characterized in that: The curing agent is mineral powder and waste gypsum. The mineral powder is obtained by water-quenching blast furnace slag, drying and grinding. The mass ratio of the mineral powder to the waste gypsum is 1-2:1-5.

8. The method for preparing the carbon-fixing concrete recycled material high elastic powder cementitious material according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Preparation of raw materials: weigh 45-80 parts of composite materials and 900-1000 parts of recycled materials, wherein the recycled materials include 250-385 parts of recycled coarse material A, 250-485 parts of recycled coarse material B, 60-185 parts of calcium waste residue, 80-205 parts of silicon waste residue, 15-95 parts of epoxy resin modified glass fiber, and 60-75 parts of acrylic emulsion; (2) Pretreatment of raw materials: grinding and sieving composite materials and recycled materials to obtain corresponding powders; (3) Add 10%-15% deionized water or anhydrous ethanol, stir evenly, and then press into shape at a pressure of 5-30 MPa. Place the mixture in an oven at 80-105°C for 6-12 hours until constant weight is reached. Then, pre-sinter and calcine the mixture in a muffle furnace, cool it, and then ball-mill and sieve it to obtain a high-elastic powder cementitious material of carbon-fixing concrete recycled material.

9. The method for preparing the carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 8, characterized in that: In step (1), the particle size of the recycled coarse material A is 10-35 mm, and the particle size of the recycled coarse material B is 5-10 mm. In step (3), the calcination process in the muffle furnace is: increasing the temperature to 1100-1250° C. at a rate of 8-20° C. / min and keeping the temperature for 1-3 h.

10. The use of the carbon-fixing concrete recycled material high elastic powder cementitious material according to claim 1, characterized in that: The carbon-fixing concrete recycled material high elastic powder cementitious material is used for industrial and civil construction, bridge engineering, railway engineering, high-strength concrete, high-performance concrete, and anti-collision concrete.

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