High-strength and high-durability concrete bridge deck pavement material and preparation method thereof

Abstract

The application relates to the field of concrete, and particularly discloses a high-strength and high-durability concrete bridge deck pavement material and a preparation method thereof.A high-strength and high-durability concrete bridge deck pavement material comprises the following raw materials in percentage by mass: cement 30-32 parts, aggregate 102-105 parts, modified fiber 0.1-0.12 parts, ash powder 33-35 parts, water reducing agent 1.3-1.5 parts, expanding agent 3.6-3.8 parts and water 18-20 parts; the ash powder comprises silica ash, fly ash and slag powder in a mass ratio of 1:2-3:3-4.The concrete bridge deck pavement material prepared by the application has the characteristics of high strength and high durability, and the service life of the concrete bridge deck is prolonged.

Description

Technical Field

[0001] This application relates to the field of concrete, and more specifically, to a high-strength, high-durability concrete bridge deck paving material and a method for preparing the same. Background Technology

[0002] Concrete bridge deck pavement is a cement mixture laid on the surface of the main beams or bridge deck. It uses cement as the core binder, combined with aggregates, water, and various modified components (such as steel fibers and polymers) to distribute vehicle loads, protect the bridge structure, and ensure driving safety. However, existing concrete bridge deck pavement materials generally suffer from low compressive strength and poor durability, making them prone to cracking and peeling, thus shortening their service life.

[0003] There is an urgent need to provide a concrete bridge deck pavement material with high strength and high durability to extend the service life of concrete bridge decks. Summary of the Invention

[0004] To improve the high strength and high durability of concrete bridge deck pavement materials, this application provides a high-strength, high-durability concrete bridge deck pavement material and its preparation method.

[0005] Firstly, this application provides a high-strength, high-durability concrete bridge deck pavement material, employing the following technical solution: A high-strength, high-durability concrete bridge deck pavement material comprises the following raw materials in weight percentages: 30-32 parts cement, 102-105 parts aggregate, 0.1-0.12 parts modified fiber, 33-35 parts lime powder, 1.3-1.5 parts water-reducing agent, 3.6-3.8 parts expansion agent, and 18-20 parts water; wherein the lime powder comprises silica fume, fly ash, and slag powder in a weight ratio of 1:2-3:3-4.

[0006] By adopting the above technical solutions, a lower water-cement ratio is used to improve macroscopic strength. Cement, as the core cementitious material, provides basic bonding force, while aggregates dispersed in the concrete act as a skeleton support, bearing and transmitting stress. Silica fume fills the nanopores, fly ash optimizes the interface structure, and slag powder supplements the later strength. The three components combine to form a dense hydration system, reducing the heat of hydration, inhibiting temperature cracks, and ensuring the integrity of the bridge deck structure. Modified fibers can bridge microcracks, absorb energy, and, together with an expansion agent, generate chemical prestress to offset shrinkage, jointly inhibiting the generation and propagation of cracks. Water-reducing agents can further reduce the water-cement ratio while ensuring construction, increasing structural density, and improving compressive strength and durability.

[0007] Optionally, the high-strength, high-durability concrete bridge deck paving material further includes polyacrylamide powder, wherein the mass ratio of the polyacrylamide powder to the cement is 0.1-0.3:10.

[0008] Optionally, the method for preparing the polyacrylamide powder includes the following steps: Acrylamide, N,N'-methylenebisacrylamide, potassium persulfate and N,N,N',N'-tetramethylethylenediamine were added to water, graphene was added, and the mixture was mixed evenly. The mixture was placed at 23-27℃ for 1-2 hours, dried, pulverized and sieved to obtain graphene-modified polyacrylamide powder. The mass ratio of acrylamide to graphene is 1:0.1-0.3.

[0009] By adopting the above technical solution, graphene sheets, due to their ultrathin characteristics, can be uniformly dispersed in the cement-aggregate interface region, fully filling the nanoscale micropores between CSH gels, resulting in a dense interface structure. On the one hand, the high modulus of graphene increases the load-bearing capacity of the interface, effectively hindering the generation of microcracks. On the other hand, its high toughness can absorb crack propagation energy, preventing microcracks from further developing into macroscopic cracks and maintaining the integrity of the interface. Polyacrylamide molecular chains can be adsorbed onto the graphene surface through amide groups, utilizing the steric hindrance effect to promote the stable and uniform dispersion of graphene in the interface region in the form of monoliths, avoiding the problem of uneven distribution caused by local agglomeration. At the same time, the flexible and hydrophilic polyacrylamide molecular chains can extend and penetrate into the micropores on the aggregate surface, enhancing the bonding density between cement and aggregate. In addition, the water retention of polyacrylamide delays the evaporation of water in the interface region, promotes the full hydration of cement, and generates more dense CSH gel.

[0010] The synergistic effect of graphene and polyacrylamide optimizes the interface structure from the nanoscale to the microscale, eliminates defects at different scales, increases interface density, blocks the erosion of moisture and harmful media, and improves the compressive strength and durability of the cement matrix. The network-like structure formed by the polyacrylamide molecular chains in the cement matrix also has flexibility. When the matrix is ​​subjected to external forces and microcracks are generated, the network can bridge the two ends of the crack, absorb energy, and hinder crack propagation, further maintaining structural integrity and compressive strength.

[0011] Optionally, the raw materials for the modified fiber include silica, zeolite powder, polypropylene fiber, and silane coupling agent, wherein the mass ratio of silica, zeolite powder, polypropylene fiber, and silane coupling agent is 0.5-1.5:0.5-1:7-8:0.2-0.5.

[0012] Optionally, the method for preparing the modified fiber includes the following steps: Polypropylene fibers are soaked in acetone, then ultrasonically cleaned and dried with ethanol, and then added to a 40-50% concentrated nitric acid solution for acid immersion treatment for 0.5-1 hours, washed with water, and dried to obtain pretreated polypropylene fibers. Silica and sodium dodecylbenzenesulfonate were added to water, stirred, and ultrasonically treated to obtain a silica suspension. Zeolite powder was added while stirring the silica suspension, and the mixture was dried to obtain a silica / zeolite composite powder. The silica / zeolite composite powder was dispersed in an ethanol solution containing a silane coupling agent, and then pretreated polypropylene fiber was added. After mixing evenly and drying, the modified fiber was obtained.

[0013] By employing the above technical solution, acetone treatment removes grease or contaminants from the surface of polypropylene fibers, followed by ethanol cleaning to further remove residual acetone. Immersion in nitric acid solution increases the etching grooves on the polypropylene fiber surface and generates polar functional groups. Sodium dodecylbenzenesulfonate promotes the uniform dispersion of silica in the zeolite particle suspension. After drying, silica is adsorbed onto the surface of the zeolite particles, reducing silica agglomeration. During the mixing process of silica / zeolite composite powder and treated polypropylene fibers, the etching grooves on the surface of the polypropylene fibers adsorb the silica / zeolite composite powder. Furthermore, the silane coupling agent can undergo hydrolysis and condensation reactions with the silanol groups on the surfaces of silica and zeolite powder to form strong Si-O-Si bonds. These bonds interact with the polar functional groups (-OH, -COOH) on the surface of the pretreated polypropylene fibers through hydrogen bonds, promoting the uniform dispersion of silica. Uniformly adhered zeolite powder covers the surface of polypropylene fibers, forming a continuous interface layer that enhances the rigidity and toughness of the polypropylene fibers and reduces their anisotropy, preventing stress concentration cracking caused by poor radial bonding and increasing the crack resistance of the polypropylene fibers. Silica accelerates early hydration to generate more dense CSH gel, which fills the micropores of concrete with nano-sized particles, improving the matrix density and providing support for the interfacial bonding between polypropylene fibers and the cementitious system, reducing weak points for crack initiation. Zeolite has a microporous structure that can form a nano- to micron-level synergy with silica, further optimizing the pore structure and reducing the permeation path. Zeolite can actively adsorb harmful ions such as chloride ions, reducing the risk of chemical corrosion. At the same time, its moisture-regulating and buffering effect can alleviate the volumetric stress caused by temperature changes, further improving compressive strength and durability.

[0014] Optionally, the length of the polypropylene fiber is 15-19 mm.

[0015] Optionally, the water-reducing agent is a polycarboxylate-based high-performance water-reducing agent.

[0016] Optionally, the expanding agent is an ettringite-type expanding agent.

[0017] Optionally, the aggregate is basalt crushed stone with a continuous gradation of 5-25mm.

[0018] Secondly, this application provides a method for preparing a high-strength, high-durability concrete bridge deck pavement material, employing the following technical solution: A method for preparing a high-strength, high-durability concrete bridge deck pavement material includes the following steps: Modified fibers and water-reducing agents are added to water and mixed evenly to obtain a mixture; cement, aggregates, ash powder, polyacrylamide powder and expansion agent are mixed evenly to obtain a mixed powder; the mixture is slowly poured into the mixed powder while it is being stirred and mixed evenly to obtain a slurry; the slurry is laid on the bridge deck, compacted and cured to obtain concrete bridge deck pavement material.

[0019] In summary, this application has the following beneficial effects: 1. This application preferably uses a lower water-cement ratio to improve macroscopic strength. By using silica fume, fly ash and slag powder in combination, a dense hydration system is formed to suppress temperature cracks and ensure the integrity of the bridge deck structure. The synergistic effect of modified fibers and expansion agents further suppresses the generation and propagation of cracks, and improves the compressive strength and durability of the bridge deck pavement material.

[0020] 2. This application preferably uses graphene and polyacrylamide in combination to eliminate defects of different scales, further increase the interfacial density, block the erosion of moisture and harmful media, and improve compressive strength and durability; the polyacrylamide molecular chains can form a network-like structure in the cement matrix, which can bridge the two ends of cracks, absorb energy, and hinder crack propagation, further increasing the compressive strength and durability of the cement matrix.

[0021] 3. This application utilizes polyacrylamide and modified fibers to form a multi-scale, complementary, and synergistic toughening system in a cement matrix. The polyacrylamide molecular chains act first at the microscale, bridging primary microcracks, consuming energy, and inhibiting crack initiation and propagation. Simultaneously, the modified fibers, through their strong interfacial bonding, bridge macro-cracks at the macroscale. The synergistic effect of the two achieves a seamless micro-to-macro crack defense system. The silica attached to the modified fibers further fills the pores and densifies the structure, while the ion adsorption and moisture regulation functions of zeolite further improve the compressive strength and durability of the system from multiple dimensions, including physical crack resistance, chemical durability, and structural density. Detailed Implementation

[0022] The following embodiments provide a further detailed description of this application. Example of preparation of graphene-modified polyacrylamide powder

[0023] Graphene, in nanosheet form with an average thickness of approximately 5-7 nm, was purchased from Behringer Technologies, Inc., USA, model number G434031; Acrylamide was purchased from Shanghai Fuzhe Chemical Co., Ltd., CAS number 79-06-1; N,N'-methylenebisacrylamide was purchased from Shanghai Jizhi Biochemical Technology Co., Ltd., with a purity of 98%; Potassium persulfate was purchased from Hubei Xinrunde Chemical Co., Ltd., with a purity of 99%; N,N,N',N'-tetramethylethylenediamine was purchased from Shanghai Anpu Experimental Technology Co., Ltd., model number CFEQ-4-522525-0001.

[0024] Preparation Example 1 10g of acrylamide, 0.03g of N,N'-methylenebisacrylamide, 0.05g of potassium persulfate and 0.03g of N,N,N',N'-tetramethylethylenediamine were added to 40g of water, along with 0.3g of graphene. The mixture was thoroughly mixed, placed at 27°C for 2 hours, dried at 60°C for 12 hours, pulverized, and sieved through a 150-mesh sieve to obtain graphene-modified polyacrylamide powder.

[0025] Preparation Example 2 10g of acrylamide, 0.03g of N,N'-methylenebisacrylamide, 0.05g of potassium persulfate and 0.03g of N,N,N',N'-tetramethylethylenediamine were added to 40g of water, along with 0.1g of graphene. The mixture was stirred until homogeneous, placed at 23°C for 1 hour, dried at 60°C for 12 hours, pulverized, and sieved through a 150-mesh sieve to obtain graphene-modified polyacrylamide powder.

[0026] Preparation Example 3 The difference from Preparation Example 1 is that no graphene was added. The specific preparation method is as follows: 10g of acrylamide, 0.03g of N,N'-methylenebisacrylamide, 0.05g of potassium persulfate and 0.03g of N,N,N',N'-tetramethylethylenediamine were added to 40g of water, mixed evenly, placed at 27℃ for 2h, dried at 60℃ for 12h, pulverized and sieved through a 150-mesh sieve to obtain graphene-modified polyacrylamide powder. Example of modified fiber preparation

[0027] Polypropylene fibers were purchased from Shandong Baiyou Engineering Materials Co., Ltd., with sizes of 3mm, 15mm, and 19mm; silica particles with a diameter of 20nm were purchased from Shanghai Xiaohuang Nanotechnology Co., Ltd., with product number XH-SiO2-15; zeolite powder with a diameter of 200 mesh was purchased from Wuhan Jiyesheng Chemical Co., Ltd.; and silane coupling agent was purchased from Hubei Shixing Chemical Co., Ltd., with product number KH-550.

[0028] Preparation Example 1 (1) 8g of polypropylene fiber with a length of 19mm was soaked in 20g of acetone for 1h, then ultrasonically cleaned and dried with 20g of ethanol, and then the polypropylene fiber was added to 10g of concentrated nitric acid solution with a concentration of 50% for acid immersion treatment for 1h, then washed with water and dried at 60℃ for 8h to obtain pretreated polypropylene fiber. (2) Add 1.5g of silica and 0.2g of sodium dodecylbenzenesulfonate to 20g of water, stir for 30min and sonicate for 15min to obtain silica suspension, add 1g of zeolite powder while stirring silica suspension, dry at 60℃ for 12h to obtain silica / zeolite composite powder. (3) Disperse the silica / zeolite composite powder obtained in step (2) into 50g of ethanol solution containing 0.5g of silane coupling agent, then add the pretreated polypropylene fiber obtained in step (1), mix evenly, and dry at 60℃ for 12h to obtain modified fiber.

[0029] Preparation Example 2 (1) 7g of polypropylene fiber with a length of 15mm was soaked in 20g of acetone for 1h, then ultrasonically cleaned and dried with 20g of ethanol, and then the polypropylene fiber was added to 10g of concentrated nitric acid solution with a concentration of 50% for acid immersion treatment for 1h, then washed with water and dried at 60℃ for 8h to obtain pretreated polypropylene fiber. (2) Add 0.5g of silica and 0.2g of sodium dodecylbenzenesulfonate to 20g of water, stir for 30min and sonicate for 15min to obtain silica suspension, add 0.5g of zeolite powder while stirring silica suspension, dry at 60℃ for 12h to obtain silica / zeolite composite powder; (3) Disperse the silica / zeolite composite powder obtained in step (2) into 50g of ethanol solution containing 0.2g of silane coupling agent, then add the pretreated polypropylene fiber obtained in step (1), mix evenly, and dry at 60℃ for 12h to obtain modified fiber.

[0030] Preparation Example 3 The difference from Preparation Example 1 is that no zeolite powder was added. The specific preparation method is as follows: (1) 8g of polypropylene fiber with a length of 19mm was soaked in 20g of acetone for 1h, then ultrasonically cleaned and dried with 20g of ethanol, and then the polypropylene fiber was added to 10g of concentrated nitric acid solution with a concentration of 50% for acid immersion treatment for 1h, then washed with water and dried at 60℃ for 8h to obtain pretreated polypropylene fiber. (2) Disperse 2.5g of silica in 50g of ethanol solution containing 0.5g of silane coupling agent, then add the pretreated polypropylene fiber obtained in step (1), mix evenly, and dry at 60℃ for 12h to obtain modified fiber.

[0031] Preparation Example 4 The difference from Preparation Example 1 is that no silicon dioxide was added. The specific preparation method is as follows: (1) 8g of polypropylene fiber with a length of 19mm was soaked in 20g of acetone for 1h, then ultrasonically cleaned and dried with 20g of ethanol, and then the polypropylene fiber was added to 10g of concentrated nitric acid solution with a concentration of 50% for acid immersion treatment for 1h, then washed with water and dried at 60℃ for 8h to obtain pretreated polypropylene fiber. (2) Disperse 2.5g of zeolite powder in 50g of ethanol solution containing 0.5g of silane coupling agent, then add the pretreated polypropylene fiber obtained in step (1), mix evenly, and dry at 60℃ for 12h to obtain modified fiber.

[0032] Preparation Example 5 The difference from Preparation Example 1 is that no silane coupling agent was added. The specific preparation method is as follows: (1) 8g of polypropylene fiber with a length of 19mm was soaked in 20g of acetone for 1h, then ultrasonically cleaned and dried with 20g of ethanol, and then the polypropylene fiber was added to 10g of concentrated nitric acid solution with a concentration of 50% for acid immersion treatment for 1h, then washed with water and dried at 60℃ for 8h to obtain pretreated polypropylene fiber. (2) Add 1.5g of silica and 0.2g of sodium dodecylbenzenesulfonate to 20g of water, stir for 30min and sonicate for 15min to obtain silica suspension, add 1g of zeolite powder while stirring silica suspension, dry at 60℃ for 12h to obtain silica / zeolite composite powder. (3) Disperse the silica / zeolite composite powder obtained in step (2) in 50g ethanol solution, then add the pretreated polypropylene fiber obtained in step (1), mix evenly, and dry at 60℃ for 12h to obtain modified fiber.

[0033] Preparation Example 6 The difference from Preparation Example 1 is that the 19 mm polypropylene fiber is replaced by an equal amount of 3 mm polypropylene fiber. Example

[0034] In the following examples, the low-heat silicate cement was purchased from Huaxin Cement Co., Ltd., model P·LH42.5; the CSA expansion agent was purchased from Guzhen Mineral Products Co., Ltd. of Lujiang County, Anhui Province, item number 20200214001; the ultrafine silica fume with a particle size of 3000 mesh was purchased from Chengdu Donglanxing New Materials Co., Ltd., model EBS96; the Class F fly ash was purchased from Yantai Anda Environmental Protection Technology Co., Ltd., grade II; the slag powder was purchased from Henan Borun New Materials, model S105; and the basalt crushed stone was purchased from Shandong Zhanfei Building Materials Co., Ltd.

[0035] Example 1: A high-strength, high-durability concrete bridge deck pavement material, the raw material dosages are shown in Table 1. The polyacrylamide powder is prepared using the method in Example 1 of polyacrylamide powder preparation; the modified fiber is prepared using the method in Example 1 of modified fiber preparation; the cement is low-heat silicate cement; the water-reducing agent is polycarboxylate water-reducing agent; the expanding agent is CSA expanding agent; the aggregate is basalt crushed stone, continuously graded 5-25mm; the silica fume is ultrafine silica fume; the fly ash is Class F fly ash.

[0036] The preparation method of the above-mentioned high-strength, high-durability concrete bridge deck pavement material includes the following steps: adding modified reinforcing fibers and water-reducing agents to water and mixing them evenly to obtain a mixture; mixing cement, aggregates, ash powder, polyacrylamide powder and expansion agent evenly to obtain a mixed powder; slowly pouring the mixture into the mixed powder while it is being stirred, mixing it evenly to obtain a slurry; laying the slurry on the bridge deck, compacting and curing it to obtain the concrete bridge deck pavement material.

[0037] Table 1. Raw material consumption of concrete bridge deck pavement materials in Examples 1-6 Raw materials / kg Example 1 Example 2 Example 3 Example 4 Low-heat silicate cement 32 31 30 30 Basalt gravel 105 104 103 102 Modified fibers 0.12 0.11 0.1 0.1 Ultrafine silica ash 4.375 4.25 5.5 5.5 Class F secondary fly ash 13.125 12.75 11 11 slag 17.5 17 16.5 16.5 Polyacrylamide powder 0.96 0.93 0.9 0.3 CSA Expanding Agent 3.8 3.7 3.6 3.6 Polycarboxylate superplasticizer 1.5 1.4 1.3 1.3 water 20 19 18 18 Example 2: A high-strength, high-durability concrete bridge deck pavement material, differing from Example 1 in that the raw material quantities are as shown in Table 1; the polyacrylamide powder is prepared using the method in Example 2 of polyacrylamide powder preparation; the modified fiber is prepared using the method in Example 2 of modified fiber preparation; the cement is low-heat silicate cement; the water-reducing agent is polycarboxylate water-reducing agent; the expanding agent is CSA expanding agent; the aggregate is basalt crushed stone with continuous gradation of 5-25mm; the silica fume is ultrafine silica fume; and the fly ash is Class F fly ash.

[0038] Example 3: A high-strength, high-durability concrete bridge deck pavement material, differing from Example 1 in that the raw material quantities are as shown in Table 1; the polyacrylamide powder is prepared using the method in Example 1 of polyacrylamide powder preparation; the modified fiber is prepared using the method in Example 2 of modified fiber preparation; the cement is low-heat silicate cement; the water-reducing agent is polycarboxylate water-reducing agent; the expanding agent is CSA expanding agent; the aggregate is basalt crushed stone with continuous gradation of 5-25mm; the silica fume is ultrafine silica fume; and the fly ash is Class F fly ash.

[0039] Example 4: A high-strength, high-durability concrete bridge deck pavement material, differing from Example 1 in that the raw material quantities are as shown in Table 1; the polyacrylamide powder is prepared using the method in Example 2 of polyacrylamide powder preparation; the modified fiber is prepared using the method in Example 1 of modified fiber preparation; the cement is low-heat silicate cement; the water-reducing agent is polycarboxylate water-reducing agent; the expanding agent is CSA expanding agent; the aggregate is basalt crushed stone with continuous gradation of 5-25mm; the silica fume is ultrafine silica fume; and the fly ash is Class F fly ash.

[0040] Example 5: A high-strength, high-durability concrete bridge deck paving material, which differs from Example 1 in that the polyacrylamide powder is prepared using the method described in Example 3 of polyacrylamide powder preparation.

[0041] Example 6: A high-strength, high-durability concrete bridge deck paving material, which differs from Example 1 in that the polyacrylamide powder is replaced by an equal amount of graphene.

[0042] Example 7: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that the modified fiber is prepared using the method in Example 3 of modified fiber preparation.

[0043] Example 8: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that the modified fiber is prepared using the method in Example 4 of modified fiber preparation.

[0044] Example 9: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that the modified fiber is prepared using the method in Example 5 of modified fiber preparation.

[0045] Example 10: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that the modified fiber is prepared using the method in Example 6 of modified fiber preparation.

[0046] Example 11: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that no polyacrylamide powder is added. Comparative Example

[0047] Comparative Example 1: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that silica fume is replaced by an equal amount of fly ash.

[0048] Comparative Example 2: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that fly ash is replaced by an equal amount of silica fume.

[0049] Comparative Example 3: A high-strength, high-durability concrete bridge deck paving material, which differs from Example 1 in that the slag powder is replaced by an equal amount of silica fume.

[0050] Comparative Example 4: A high-strength, high-durability concrete bridge deck paving material, which differs from Example 1 in that fly ash and slag powder are replaced by silica fume in equal amounts.

[0051] Comparative Example 5: A high-strength, high-durability concrete bridge deck paving material, which differs from Example 1 in that silica fume and slag powder are replaced by fly ash in equal amounts.

[0052] Comparative Example 6: A high-strength, high-durability concrete bridge deck paving material, which differs from Example 1 in that silica fume and fly ash are replaced by slag powder in equal amounts.

[0053] Comparative Example 7: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that the modified fiber is replaced by an equal amount of polypropylene fiber; the polypropylene fiber was purchased from Shandong Baiyou Engineering Materials Co., Ltd., and the model is 19mm.

[0054] Comparative Example 8: A high-strength, high-durability concrete bridge deck pavement material, which differs from Example 1 in that no modified fibers are added. Performance testing

[0055] High-strength, high-durability concrete bridge deck paving materials were prepared according to the methods in the examples and comparative examples, and their performance was tested according to the following methods. The test results are recorded in Table 2.

[0056] 1. Compressive strength, flexural strength, chloride ion penetration resistance test and carbonation test shall be conducted for 28 days in accordance with standard JTG 3420-2020 "Test Procedures for Cement and Cement Concrete in Highway Engineering" and the test methods shall refer to GB / T50082-2009 "Standard for Test Methods of Long-Term Performance and Durability of Ordinary Concrete" and other regulations.

[0057] Table 2. Mechanical property test results of concrete bridge deck pavement materials prepared in the examples and comparative examples. project Compressive strength (MPa) Flexural strength (MPa) <![CDATA[Chloride ion diffusion coefficient (×10 -8 cm 2 / s)]]> Carbonization depth (mm) Example 1 55.12 5.39 1.5 0.54 Example 2 54.95 5.27 1.7 0.55 Example 3 53.24 5.06 1.6 0.56 Example 4 52.39 4.97 1.8 0.58 Example 5 51.21 4.92 1.8 0.75 Example 6 50.19 4.87 1.9 0.81 Example 7 49.11 4.75 2.1 1.23 Example 8 48.86 4.69 2.2 1.45 Example 9 48.35 4.36 2.3 1.69 Example 10 47.79 4.29 2.5 2.04 Example 11 45.47 4.15 2.7 2.21 Comparative Example 1 41.26 3.86 3.0 2.74 Comparative Example 2 38.53 3.19 3.1 2.85 Comparative Example 3 36.71 3.08 3.3 2.97 Comparative Example 4 31.65 2.87 3.5 3.18 Comparative Example 5 30.52 2.59 3.6 3.39 Comparative Example 6 29.35 2.46 3.7 3.70 Comparative Example 7 42.01 3.97 2.9 2.32 Comparative Example 8 35.96 3.20 3.8 3.83 As shown in Table 2, the high-strength, high-durability concrete bridge deck pavement materials prepared in Examples 1-4 of this application have good compressive strength and durability. Compared with Example 1, Example 5, without the addition of graphene, has slightly reduced compressive strength and durability, which may be due to the weakening of interface density caused by the absence of graphene. Compared with Example 1, Example 6, where polyacrylamide powder is replaced by an equal amount of graphene, has slightly reduced compressive strength and durability, which may be due to the lack of polyacrylamide, resulting in a weakened synergistic effect between polyacrylamide and graphene, and an inability to effectively eliminate defects inside the cementitious matrix. Compared with Example 1, Examples 7-9 and Comparative Example 7 show that the modified fiber preparation process did not include zeolite powder, silica, silane coupling agent, or polypropylene, respectively. When the fiber was replaced in equal amounts, the compressive strength and durability decreased compared to Examples 1-4. This may be due to the lack of modified components, which weakens the bonding strength between the polypropylene fiber and the cementitious material and its ability to adsorb harmful ions. Comparing Example 10 with Example 1, replacing 19mm polypropylene fiber with an equal amount of 3mm polypropylene fiber reduced the compressive strength and durability. This may be because the fiber length was too short, resulting in poor dispersion and easy agglomeration in the system, thus forming weak areas in the structure and causing a decrease in compressive strength and durability. Comparing Example 11 with Example 1, without the addition of polyacrylamide powder, the compressive strength and durability decreased. This may be because the synergistic effect of polyacrylamide and modified fiber was destroyed, thus weakening the defense effect against concrete cracks.

[0058] Comparing Comparative Examples 1-6 with Example 1, it can be seen that adding only one or two of silica fume, fly ash, and slag powder significantly reduces compressive strength and durability. This may be because the three components constitute a multi-component synergistic protection mechanism, jointly enhancing the density and structural integrity of concrete. Comparing Comparative Example 8 with Example 1, it can be seen that without the addition of modified fibers, compressive strength and durability significantly reduce. This may be due to the weakening of the micro-to-macro seamless crack defense effectiveness of modified fibers and polyacrylamide.

[0059] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-strength, high-durability concrete bridge deck pavement material, characterized in that, The raw materials include the following components by weight percentage: 30-32 parts cement, 102-105 parts aggregate, 0.1-0.12 parts modified fiber, 33-35 parts ash powder, 1.3-1.5 parts water-reducing agent, 3.6-3.8 parts expansion agent, and 18-20 parts water; the ash powder includes silica fume, fly ash, and slag powder in a weight ratio of 1:2-3:3-4.

2. The high-strength, high-durability concrete bridge deck pavement material according to claim 1, characterized in that, The high-strength, high-durability concrete bridge deck paving material also includes polyacrylamide powder, and the mass ratio of the polyacrylamide powder to the cement is 0.1-0.3:

10.

3. The high-strength, high-durability concrete bridge deck pavement material according to claim 2, characterized in that, The method for preparing the polyacrylamide powder includes the following steps: Acrylamide, N,N'-methylenebisacrylamide, potassium persulfate and N,N,N',N'-tetramethylethylenediamine were added to water, graphene was added, and the mixture was mixed evenly. The mixture was placed at 23-27℃ for 1-2 hours, dried, pulverized and sieved to obtain graphene-modified polyacrylamide powder. The mass ratio of acrylamide to graphene is 1:0.1-0.

3.

4. The high-strength, high-durability concrete bridge deck pavement material according to claim 1, characterized in that, The raw materials for the modified fiber include silica, zeolite powder, polypropylene fiber, and silane coupling agent, with the mass ratio of silica, zeolite powder, polypropylene fiber, and silane coupling agent being 0.5-1.5:0.5-1:7-8:0.2-0.

5.

5. The high-strength, high-durability concrete bridge deck pavement material according to claim 4, characterized in that, The method for preparing the modified fiber includes the following steps: Polypropylene fibers are soaked in acetone, then ultrasonically cleaned and dried with ethanol, and then added to a 40-50% concentrated nitric acid solution for acid immersion treatment for 0.5-1 hours, washed with water, and dried to obtain pretreated polypropylene fibers. Silica and sodium dodecylbenzenesulfonate were added to water, stirred, and ultrasonically treated to obtain a silica suspension. Zeolite powder was added while stirring the silica suspension, and the mixture was dried to obtain a silica / zeolite composite powder. The silica / zeolite composite powder was dispersed in an ethanol solution containing a silane coupling agent, and then pretreated polypropylene fiber was added. After mixing evenly and drying, the modified fiber was obtained.

6. The high-strength, high-durability concrete bridge deck pavement material according to claim 5, characterized in that, The polypropylene fiber has a length of 15-19 mm.

7. The high-strength, high-durability concrete bridge deck pavement material according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate high-performance water-reducing agent.

8. The high-strength, high-durability concrete bridge deck pavement material according to claim 1, characterized in that, The expanding agent is an ettringite-type expanding agent.

9. A high-strength, high-durability concrete bridge deck pavement material according to claim 1, characterized in that, The aggregate is basalt crushed stone with a continuous gradation of 5-25mm.

10. A method for preparing a high-strength, high-durability concrete bridge deck pavement material according to any one of claims 1-9, characterized in that, Includes the following steps: Modified fibers and water-reducing agents are added to water and mixed evenly to obtain a mixture; cement, aggregates, ash powder, polyacrylamide powder and expansion agent are mixed evenly to obtain a mixed powder; the mixture is slowly poured into the mixed powder while it is being stirred and mixed evenly to obtain a slurry; the slurry is laid on the bridge deck, compacted and cured to obtain concrete bridge deck pavement material.