Waste composite material regenerated fiber anti-seismic concrete

Abstract

The invention relates to the technical field of concrete, and particularly discloses waste composite material regenerated fiber anti-seismic concrete. The waste composite material regenerated fiber anti-seismic concrete is prepared from the following raw materials: cement, inorganic-organic modified regenerated aggregate, composite fibers, regenerated plastic particles, nano silicon dioxide, a water reducing agent and water. The superfine slag powder, the polyvinyl alcohol and the tannic acid are adopted for conducting composite modification on the recycled aggregate, the porosity and the water absorption rate in the recycled aggregate are effectively reduced, the problem that the strength of the recycled aggregate is insufficient is solved, the modified recycled aggregate is added into the concrete, and the anti-seismic property of the concrete is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete, in particular to waste composite material recycled fiber earthquake-resistant concrete. Background Art

[0002] With the accelerated pace of urbanization, the demand for concrete is increasing, and with it, the demand for sand and stone. However, natural sand and stone resources are limited, and their extraction can damage the natural environment. Furthermore, the demolition of old buildings generates a large amount of construction waste, which is often disposed of through long-term storage or landfill, resulting in resource waste and ecological pressure. Crushing and processing waste concrete, bricks, and other materials from construction waste into recycled aggregate is of great practical significance for addressing the shortage of natural sand and stone resources and mitigating the hazards of construction waste landfills.

[0003] Recycled aggregate from construction waste is composed of primary aggregate and the old cement layer wrapped around it. It can be divided into recycled coarse aggregate and recycled fine aggregate according to particle size. After the crushing process, a large number of microcracks and pores will be generated on the surface of the recycled aggregate, resulting in problems such as large crushing index, high water absorption, and high porosity. In addition, the interface layer between recycled aggregate and cement stone is the weakest area of ​​recycled concrete, and the interface bonding performance between recycled aggregate and cement stone is not as good as that of natural aggregate. This is because the old cement slurry attached to the surface of recycled aggregate has a loose structure and high porosity, and has poor physical and chemical compatibility with the new cement slurry. This leads to weak bonding between the old and new interfaces, forming a weak interface transition zone (ITZ), which significantly reduces the overall bonding strength, thereby leading to defects in concrete performance. Summary of the Invention

[0004] In order to improve the performance of recycled aggregate and enhance the bonding between the recycled aggregate and cement stone interface, the present application provides waste composite material recycled fiber seismic resistant concrete.

[0005] In a first aspect, the waste composite material recycled fiber seismic resistant concrete provided by the present application adopts the following technical solution: the waste composite material recycled fiber seismic resistant concrete is prepared from the following raw materials in parts by weight: 24-30 parts of cement, 120-130 parts of inorganic-organic modified recycled aggregate, 14-18 parts of composite fiber, 9-13 parts of recycled plastic microparticles, 2-3 parts of nano-silica, 1.7-2.3 parts of water reducer, and 20-30 parts of water; The raw materials for preparing the inorganic-organic modified recycled aggregate include waste concrete, slag powder, polyvinyl alcohol and tannic acid, and the weight ratio of the waste concrete, slag powder, polyvinyl alcohol and tannic acid is 10:(2-3):(2-4):(1-2).

[0006] By adopting the above technical solution, this application effectively reduces the porosity and water absorption rate inside the recycled aggregate by composite modification of the recycled aggregate, improves the problem of insufficient strength of the recycled aggregate, and maintains good working performance. By adding composite fibers, the crack resistance and toughness of the concrete are improved, and the recycled plastic particles make up for the rigidity defects of the recycled aggregate with their flexibility, further optimizing the overall performance of the material. In addition, the addition of nano-silica as an additive further improves the microstructure inside the recycled concrete, enhances the bonding force between particles, improves the density and durability of the concrete, and extends the service life of the building. The overall solution realizes the efficient recycling of resources, reduces dependence on natural resources, and significantly improves the comprehensive performance of concrete.

[0007] Specifically, the recycled aggregate is inorganically modified with slag micropowder, which continuously hydrates and fills the cracks and voids on the surface of the recycled aggregate, exerting its micro-aggregate effect and volcanic ash activity. The hydration products produced during the hydration process reinforce the recycled aggregate, improving its mechanical strength. Furthermore, the inorganically modified recycled aggregate is organically modified with polyvinyl alcohol and tannic acid. The polyvinyl alcohol further fills surface defects and forms an organic "film" on the surface. Simultaneously, the cross-linking effect of the tannic acid effectively increases the density of this organic "film," thereby enhancing the overall structural strength of the recycled aggregate.

[0008] Preferably, the preparation method of the inorganic-organic modified recycled aggregate comprises the following steps: (1) crushing, screening, washing and drying the waste concrete to obtain recycled aggregate; (2) mixing slag powder and water, stirring evenly, and preparing 8-12 wt% slag powder slurry, soaking the recycled aggregate in the slag powder slurry for 1-2 hours, taking out and air-drying to obtain inorganic modified recycled aggregate; (3) Mix polyvinyl alcohol and water, stir evenly, and prepare 8-12 wt% polyvinyl alcohol solution, then add tannic acid to the polyvinyl alcohol solution, and soak the inorganic modified recycled aggregate in the polyvinyl alcohol solution for 1-2 hours, take it out and air-dry it to obtain inorganic-organic modified recycled aggregate.

[0009] By adopting the above technical solution, the recycled aggregate is inorganically modified by making slag micropowder into a slurry. The slag micropowder fills the pores of the recycled aggregate and simultaneously undergoes a secondary hydration reaction with the cement hydration product to generate more hydrated calcium silicate gel, thereby improving the density and strength of the recycled aggregate interface transition zone. Polyvinyl alcohol and tannic acid work synergistically. The hydroxyl groups in polyvinyl alcohol and the phenolic hydroxyl groups in tannic acid can form hydrogen bonds, thereby constructing a stable organic coating layer on the surface of the inorganically modified recycled aggregate, further filling the microcracks and pores on the surface of the recycled aggregate, and covering the surface of the recycled aggregate, playing a role in closing the pores and reducing the water absorption rate. The composite modification method of the present application effectively overcomes the problems of high water absorption and low strength of traditional recycled aggregates, and significantly improves the overall performance of recycled concrete.

[0010] Preferably, the recycled aggregate in step (1) is recycled coarse aggregate with a particle size of 5-15 mm and recycled fine aggregate with a particle size of 0.5-3.5 mm.

[0011] By adopting the above technical solution, the recycled aggregate is divided into recycled coarse aggregate with a particle size of 5-15mm and recycled fine aggregate with a particle size of 0.5-3.5mm, which can optimize the aggregate gradation, improve the uniformity of the internal structure of concrete, reduce the void ratio, and increase the density of concrete.

[0012] Preferably, the specific surface area of ​​the slag powder is 490 to 530 m 2 / kg, the specific surface area of ​​the nano-silicon dioxide is 150-300m 2 / g.

[0013] By adopting the above technical solution, the specific surface area of ​​slag powder is controlled at 490-530m 2 / kg range, it can significantly improve its activity and enhance the bonding strength between it and cement stone, thereby improving the microstructure and density of concrete. The specific surface area of ​​nano-silica is controlled at 150-300m 2 / g range, it can effectively fill the internal pores of concrete, further enhance the bonding force between particles, and improve the compressive strength and durability of concrete.

[0014] Preferably, the composite fiber includes steel fiber and polyacrylonitrile fiber, and the weight ratio of the steel fiber to the polyacrylonitrile fiber is 1:(0.8-1.2).

[0015] By adopting this technical solution, the synergistic effect of steel fibers and polyacrylonitrile fibers significantly improves the toughness, ductility, and seismic resistance of concrete incorporating these fibers. Specifically, polyacrylonitrile fibers inhibit the formation of microcracks at the initial cracking stage and before macrocracks form, effectively preventing crack propagation, improving the concrete's impermeability and frost resistance, and addressing the problem of early cracking. Steel fibers, on the other hand, act as bridges after macrocracks have formed, imparting greater tensile strength and ductility to the concrete.

[0016] Preferably, the recycled plastic particles are plastic particles prepared by crushing waste ABS plastic or waste PC plastic.

[0017] By adopting this technical solution, the flexibility of recycled plastic microparticles and the rigidity of modified recycled aggregates complement each other, significantly improving the compressive strength and toughness of concrete. Furthermore, the introduction of recycled plastic microparticles reduces reliance on natural resources, achieving efficient waste utilization and achieving favorable economic and environmental benefits.

[0018] Preferably, the water reducer is a polycarboxylic acid water reducer.

[0019] By adopting the above technical solution, the use of polycarboxylic acid-based water reducer can effectively reduce the water consumption of concrete mixture, improve the fluidity and workability of concrete, reduce segregation and bleeding, improve the construction performance of concrete, and increase the density of hardened concrete.

[0020] In a second aspect, the present application provides a method for preparing seismic-resistant concrete made of recycled fiber waste composite materials, which adopts the following technical solutions: A method for preparing seismic-resistant concrete made of recycled fiber waste composite materials comprises the following steps: The raw materials are weighed according to the component ratio, and cement, inorganic-organic modified recycled aggregate, composite fiber, recycled plastic particles, and nano-silica are added into a mixer for dry mixing for 3-5 minutes. Then, a water reducer and water are added into the mixer, and stirring is continued for 5-10 minutes to obtain waste composite material recycled fiber seismic resistant concrete.

[0021] By adopting the above technical solution, the above raw materials are dry-mixed and wet-mixed according to specific proportions, ensuring that the various components are evenly distributed in the concrete matrix, thereby greatly improving the microstructure of the concrete, significantly improving the bonding strength between materials, and enhancing the overall performance of the concrete.

[0022] This application has the following beneficial effects: This application modifies the recycled aggregate to effectively reduce the porosity and water absorption rate inside the recycled aggregate, improve the problem of insufficient strength of the recycled aggregate, and maintain good working performance. By adding composite fibers, the crack resistance and toughness of the concrete are improved, and the recycled plastic particles make up for the rigidity defects of the recycled aggregate with their flexibility, further optimizing the overall performance of the material. In addition, the addition of nano-silica as an additive further improves the microstructure inside the recycled concrete, enhances the bonding force between particles, improves the density and durability of the concrete, and extends the service life of the building. The overall solution achieves efficient recycling of resources, reduces dependence on natural resources, and significantly improves the comprehensive performance of concrete.

[0023] The recycled aggregate is inorganically modified with slag micropowder, which continuously hydrates and fills the cracks and voids on the surface of the recycled aggregate, exerting its micro-aggregate effect and pozzolanic activity. The hydration products produced during the hydration process reinforce the recycled aggregate, improving its mechanical strength. Furthermore, the inorganically modified recycled aggregate is organically modified with polyvinyl alcohol and tannic acid. The polyvinyl alcohol further fills surface defects and forms an organic "film" on the surface. Simultaneously, the cross-linking effect of the tannic acid effectively increases the density of this organic "film," thereby enhancing the overall structural strength of the recycled aggregate. DETAILED DESCRIPTION

[0024] Preparation Example Preparation Example 1 Preparation method of inorganic-organic modified recycled aggregate: (1) 120 kg of waste concrete was crushed, sieved, washed, and dried to obtain recycled aggregate; (2) 24 kg of slag powder and water were mixed and stirred to prepare 8 wt% slag powder slurry, and the recycled aggregate was soaked in the slag powder slurry for 1 hour, and then taken out and air-dried to obtain inorganic modified recycled aggregate; (3) 24 kg of polyvinyl alcohol was mixed with water and stirred evenly to prepare an 8 wt% polyvinyl alcohol solution. Then 12 kg of tannic acid was added to the polyvinyl alcohol solution, and the inorganic modified recycled aggregate was soaked in the polyvinyl alcohol solution for 1 hour. After being taken out and air-dried, the inorganic-organic modified recycled aggregate was obtained.

[0025] Preparation Example 2 Preparation method of inorganic-organic modified recycled aggregate: (1) 125 kg of waste concrete was crushed, sieved, washed, and dried to obtain recycled aggregate; (2) 31 kg of slag powder and water were mixed and stirred evenly to prepare a 10 wt% slag powder slurry, and the recycled aggregate was soaked in the slag powder slurry for 1.5 h, and then taken out and air-dried to obtain the inorganic modified recycled aggregate; (3) 37.5 kg of polyvinyl alcohol was mixed with water and stirred evenly to prepare a 10 wt% polyvinyl alcohol solution. Then 19 kg of tannic acid was added to the polyvinyl alcohol solution, and the inorganic modified recycled aggregate was soaked in the polyvinyl alcohol solution for 1.5 h. After being taken out and air-dried, the inorganic-organic modified recycled aggregate was obtained.

[0026] Preparation Example 3 Preparation method of inorganic-organic modified recycled aggregate: (1) 130 kg of waste concrete was crushed, sieved, washed, and dried to obtain recycled aggregate; (2) 39 kg of slag powder and water were mixed and stirred evenly to prepare a 12 wt% slag powder slurry, and the recycled aggregate was soaked in the slag powder slurry for 2 h, and then taken out and air-dried to obtain the inorganic modified recycled aggregate; (3) 52 kg of polyvinyl alcohol was mixed with water and stirred evenly to prepare a 12 wt% polyvinyl alcohol solution. Then 26 kg of tannic acid was added to the polyvinyl alcohol solution, and the inorganic modified recycled aggregate was soaked in the polyvinyl alcohol solution for 2 h. After being taken out and air-dried, the inorganic-organic modified recycled aggregate was obtained.

[0027] Preparation Example 4 The difference between this preparation example and preparation example 2 is that an equal amount of cement is used to replace the slag powder. Example

[0028] Example 1 The waste composite material recycled fiber seismic concrete includes the following raw materials: 24 kg cement (Conch brand ordinary Portland cement with a strength grade of P.O42.5), 120 kg inorganic-organic modified recycled aggregate (prepared in Preparation Example 1), 7.8 kg steel fiber (Ruijian) and 6.2 kg polyacrylonitrile fiber (Hongfang), 9 kg recycled ABS plastic particles (OUSU ABS-850A), 2 kg nano-silica, 1.7 kg polycarboxylic acid water reducer (Huaxuan High-tech KH-4), and 20 kg water.

[0029] The method for preparing the waste composite material recycled fiber earthquake-resistant concrete in this embodiment includes the following steps: Cement, inorganic-organic modified recycled aggregate, steel fiber and polyacrylonitrile fiber, recycled ABS plastic particles, and nano-silica were added into a mixer and dry-mixed for 3 minutes. Then, polycarboxylic acid-based water reducer and water were added into the mixer and stirred for 5 minutes to obtain waste composite material recycled fiber seismic-resistant concrete.

[0030] Example 2 Waste composite material recycled fiber seismic concrete includes the following raw materials: 27kg cement (Conch brand ordinary Portland cement with strength grade P.O42.5), 125kg inorganic-organic modified recycled aggregate (prepared in Preparation Example 2), 8kg steel fiber (Ruijian) and 8kg polyacrylonitrile fiber (Hongfang), 11kg recycled ABS plastic particles (OUSU ABS-850A), 2.5kg nano-silica, 2kg polycarboxylic acid water reducer (Huaxuan High-tech KH-4), and 25kg water.

[0031] The method for preparing the waste composite material recycled fiber earthquake-resistant concrete in this embodiment includes the following steps: Cement, inorganic-organic modified recycled aggregate, steel fiber and polyacrylonitrile fiber, recycled ABS plastic particles, and nano-silica were added into a mixer and dry-mixed for 4 minutes. Then, polycarboxylic acid-based water reducer and water were added into the mixer and stirred for 8 minutes to obtain waste composite material recycled fiber seismic concrete.

[0032] Example 3 Waste composite material recycled fiber seismic concrete includes the following raw materials: 30kg cement (Conch brand ordinary Portland cement with strength grade P.O42.5), 130kg inorganic-organic modified recycled aggregate (prepared in Preparation Example 3), 8.2kg steel fiber (Ruijian) and 9.8kg polyacrylonitrile fiber (Hongfang), 13kg recycled PC plastic particles (Dow PC 4510-6), 3kg nano-silica, 2.3kg polycarboxylic acid water reducer (Huaxuan High-tech KH-4), and 30kg water.

[0033] The method for preparing the waste composite material recycled fiber earthquake-resistant concrete in this embodiment includes the following steps: Cement, inorganic-organic modified recycled aggregate, steel fiber and polyacrylonitrile fiber, recycled PC plastic particles, and nano-silica were added into a mixer and dry-mixed for 5 minutes. Then, polycarboxylic acid-based water reducer and water were added into the mixer and stirred for 10 minutes to obtain waste composite material recycled fiber seismic-resistant concrete.

[0034] Comparative Example Comparative Example 1 The waste composite material recycled fiber seismic resistant concrete is different from Example 2 in that the inorganic-organic modified recycled aggregate prepared in Preparation Example 4 is used.

[0035] Comparative Example 2 The waste composite material recycled fiber seismic resistant concrete is different from Example 2 in that an inorganic modified recycled aggregate is used to replace the inorganic-organic modified recycled aggregate in equal amounts.

[0036] Among them, the preparation method of inorganic modified recycled aggregate is: (1) 125 kg of waste concrete was crushed, sieved, washed, and dried to obtain recycled aggregate; (2) 31 kg of slag powder and water were mixed and stirred evenly to prepare a 10 wt% slag powder slurry. The recycled aggregate was soaked in the slag powder slurry for 1.5 hours, and then taken out and air-dried to obtain the inorganic modified recycled aggregate.

[0037] Comparative Example 3 The waste composite material recycled fiber seismic resistant concrete is different from Example 2 in that the inorganic-organic modified recycled aggregate is replaced by an equal amount of organic modified recycled aggregate.

[0038] The preparation method of organic modified recycled aggregate is as follows: (1) 125 kg of waste concrete was crushed, sieved, washed, and dried to obtain recycled aggregate; (2) 37.5 kg of polyvinyl alcohol was mixed with water and stirred evenly to prepare a 10 wt% polyvinyl alcohol solution. Then 19 kg of tannic acid was added to the polyvinyl alcohol solution, and the recycled aggregate was soaked in the polyvinyl alcohol solution for 1.5 hours. After being taken out and air-dried, the organically modified recycled aggregate was obtained.

[0039] Comparative Example 4 The waste composite material recycled fiber seismic concrete is different from Example 2 in that the inorganic-organic modified recycled aggregate is replaced by an equal amount of recycled aggregate.

[0040] Among them, recycled aggregate is obtained by crushing, screening, washing and drying waste concrete.

[0041] Comparative Example 5 The waste composite material recycled fiber seismic concrete is different from Example 2 in that steel fibers are used to replace polyacrylonitrile fibers in equal amounts.

[0042] Comparative Example 6 The waste composite material recycled fiber seismic concrete is different from Example 2 in that an equal amount of polyacrylonitrile fiber is used to replace the steel fiber.

[0043] Comparative Example 7 The waste composite material recycled fiber seismic resistant concrete is different from Example 2 in that glass microbeads are used to replace recycled plastic microparticles in equal amounts.

[0044] Performance testing According to GB / T50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete", the 7d compressive strength (standard specimen), 28d compressive strength (standard specimen), 28d flexural strength (standard specimen), and 28d splitting tensile strength (standard specimen) of the specimens prepared from the concrete of each embodiment and comparative example were tested, and the test results are recorded in Table 1.

[0045] Table 1 According to Example 2 and Comparative Example 1 and combined with the data in Table 1, it can be seen that the inorganic modification effect of slag micropowder slurry on recycled aggregate is better than that of cement. Since the particle size of slag micropowder is smaller than that of cement and fly ash particles and the dispersibility is better, and the activity index of slag micropowder is higher than that of fly ash, the hydration products of slag micropowder can effectively fill defects such as microcracks and pores, and the aggregate structure is dense, which is beneficial.

[0046] Based on Example 2 and Comparative Examples 2-3, combined with the data in Table 1, it can be seen that inorganic modification or organic modification of recycled aggregate alone results in poor modification effects. In the present application, after the recycled aggregate is inorganically modified with a slag fine powder slurry, the slag fine powder hydration products continuously fill the cracks and pores on the surface of the recycled fine aggregate. Furthermore, after organic modification with a PVA solution, an organic "film" forms on the surface of the recycled aggregate, further reducing the number of pores and cracks in the recycled fine aggregate while improving its mechanical strength.

[0047] According to Example 2 and Comparative Example 4, combined with the data in Table 1, it can be seen that the recycled aggregate in Comparative Example 4 was directly added to the cement matrix without modification, resulting in poor overall performance of the concrete. In the present application, the recycled aggregate is inorganically modified by preparing slag powder into a slurry. The slag powder fills the pores of the recycled aggregate and simultaneously undergoes a secondary hydration reaction with the cement hydration product to generate more hydrated calcium silicate gel, thereby improving the density and strength of the recycled aggregate interface transition zone. After organic modification with polyvinyl alcohol and tannic acid, the polyvinyl alcohol further fills the defects on the surface of the recycled aggregate and forms an organic "film" on the surface. At the same time, under the cross-linking action of the tannic acid, the density of this organic "film" is effectively improved, thereby enhancing the overall structural strength of the recycled aggregate and significantly improving the seismic performance of the concrete.

[0048] According to Example 2 and Comparative Examples 5-6, combined with the data in Table 1, it can be seen that the addition of only one type of reinforcing fiber in Comparative Examples 5-6 does not significantly improve the performance of concrete. In the present application, the synergistic effect of steel fiber and polyacrylonitrile fiber is achieved, and the toughness, ductility, and seismic resistance of the concrete containing the composite steel fiber and polyacrylonitrile fiber are significantly improved.

[0049] Based on Example 2 and Comparative Example 7, combined with the data in Table 1, it can be seen that glass microspheres are rigid materials. Adding them to concrete can make the concrete too rigid, leading to a decrease in the quality of the concrete structure. However, the present invention utilizes the complementary advantages of the flexibility of recycled plastic microparticles and the rigidity of modified recycled aggregate to significantly improve the compressive strength and toughness of concrete.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Waste composite material recycled fiber seismic concrete, characterized by: The invention is prepared from the following raw materials in parts by weight: 24-30 parts of cement, 120-130 parts of inorganic-organic modified recycled aggregate, 14-18 parts of composite fiber, 9-13 parts of recycled plastic microparticles, 2-3 parts of nano-silica, 1.7-2.3 parts of water reducer, and 20-30 parts of water; The raw materials for preparing the inorganic-organic modified recycled aggregate include waste concrete, slag powder, polyvinyl alcohol and tannic acid, and the weight ratio of the waste concrete, slag powder, polyvinyl alcohol and tannic acid is 10: (2-3): (2-4): (1-2).

2. The waste composite material recycled fiber seismic resistant concrete according to claim 1, characterized in that: The preparation method of the inorganic-organic modified recycled aggregate comprises the following steps: (1) Crushing, screening, washing and drying the waste concrete to obtain recycled aggregate; (2) Mix slag powder and water, stir evenly, and prepare 8-12wt% slag powder slurry, soak the recycled aggregate in the slag powder slurry for 1-2 hours, take out and air-dry to obtain inorganic modified recycled aggregate; (3) Mix polyvinyl alcohol and water, stir evenly, and prepare 8-12 wt% polyvinyl alcohol solution. Then add tannic acid to the polyvinyl alcohol solution, and soak the inorganic modified recycled aggregate in the polyvinyl alcohol solution for 1-2 hours. Take it out and air-dry it to obtain inorganic-organic modified recycled aggregate.

3. The waste composite material recycled fiber seismic resistant concrete according to claim 2, characterized in that: The recycled aggregate in step (1) is recycled coarse aggregate with a particle size of 5-15 mm and recycled fine aggregate with a particle size of 0.5-3.5 mm.

4. The waste composite material recycled fiber seismic resistant concrete according to claim 1, characterized in that: The specific surface area of ​​the slag micropowder is 490-530 m² / kg, and the specific surface area of ​​the nano-silicon dioxide is 150-300 m² / g.

5. The waste composite material recycled fiber seismic resistant concrete according to claim 1, characterized in that: The composite fiber includes steel fiber and polyacrylonitrile fiber, and the weight ratio of the steel fiber to the polyacrylonitrile fiber is 1:(0.8-1.2).

6. The waste composite material recycled fiber seismic resistant concrete according to claim 1, characterized in that: The recycled plastic particles are plastic particles prepared by crushing waste ABS plastic or waste PC plastic.

7. The waste composite material recycled fiber seismic resistant concrete according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid water reducing agent.

8. The method for preparing seismic-resistant concrete made of recycled fiber from waste composite materials according to any one of claims 1 to 7, characterized in that: The following steps are involved: The raw materials are weighed according to the component ratio, and cement, inorganic-organic modified recycled aggregate, composite fiber, recycled plastic particles, and nano-silica are added into a mixer for dry mixing for 3-5 minutes. Then, a water reducer and water are added into the mixer, and stirring is continued for 5-10 minutes to obtain waste composite material recycled fiber seismic resistant concrete.

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