High-strength and high-modulus PE fiber reinforced UHPC board and preparation method thereof

Abstract

The invention relates to the field of high-performance materials, in particular to a high-strength and high-modulus PE fiber reinforced UHPC board and a preparation method thereof. The quartz stone is prepared from the following raw materials in parts by weight: 100-120 parts of quartz stone; 90 to 105 parts of a cementing material; 0.3 to 0.5 part of a water reducing agent; 30-40 parts of a processing aid; 40 to 50 parts of reinforced coated PE fiber; the reinforced coated PE fiber comprises an ultra-high molecular weight polyethylene fiber and a reinforced layer coated on the surface of the ultra-high molecular weight polyethylene fiber, and the relative molecular weight of the ultra-high molecular weight polyethylene fiber is greater than 1 million; the reinforcing layer is prepared from organic polysilazane, amphiphilic active silicone oil, methyl vinyl silicon hybrid aryne resin, 1, 3-bis (3-methacryloyloxypropyl) tetra (trimethylsiloxy) disiloxane, peroxide and a solvent. The UHPC board prepared by the technical scheme has better compressive strength and durability.

Description

Technical Field

[0001] This application relates to the field of high-performance materials, and more specifically, to a high-strength, high-modulus PE fiber reinforced UHPC board and its preparation method. Background Technology

[0002] Ultra-high performance concrete (UHPC) is an innovative cement-based composite material that achieves a significant leap in mechanical properties and durability through optimized particle size distribution, the use of high-efficiency water-reducing agents, and the incorporation of fiber materials. Compared to ordinary concrete, UHPC exhibits extremely high compressive strength (typically exceeding 120 MPa) and flexural strength, excellent toughness, and outstanding durability (such as impermeability, corrosion resistance, and freeze-thaw resistance). Based on these superior properties, UHPC has been widely applied in long-span bridge structures, lightweight precast components, building curtain walls, seismic reinforcement, and special protective engineering, representing the forefront of building materials development.

[0003] Among the reinforcing components of UHPC, metal fibers, such as steel fibers and copper-plated steel fibers, are currently the most widely used reinforcing materials. These fibers can effectively bridge cracks in the concrete matrix, significantly improving the tensile strength and toughness of the material, which is key to achieving ultra-high mechanical properties in UHPC. However, existing metal fiber reinforced UHPC has a significant drawback: when the structure is exposed to harsh acid-base-salt corrosive environments such as moisture, chlorides, and acid rain for extended periods, the metal fibers themselves are prone to electrochemical corrosion. This corrosion not only weakens the cross-sectional area of ​​the fibers, leading to a decrease in their reinforcing effect, but more seriously, the volume expansion of corrosion products can trigger matrix cracking, thereby accelerating structural deterioration and severely affecting the long-term durability and service life of UHPC.

[0004] To overcome the corrosion resistance problem of metal fibers, those skilled in the art have attempted to use various organic or non-metallic fibers as substitutes, such as glass fibers, polypropylene (PP) fibers, and polyethylene (PE) fibers. These fibers possess good corrosion resistance and can, to some extent, solve the durability problems caused by the corrosion of metal fibers. However, the applicant recognizes that the interfacial bond strength between these non-metallic fibers and the cement matrix is ​​typically low, and their own elastic modulus and tensile strength are often difficult to match those of metal fibers. Therefore, UHPC reinforced with these fibers exhibits mechanical properties, particularly flexural strength and toughness, far lower than that of UHPC reinforced with metal fibers, making it difficult to meet the application requirements of critical structural components with high load-bearing capacity.

[0005] Therefore, existing technologies face a prominent contradiction: while metal fibers offer high mechanical properties, their durability is compromised, whereas organic fibers improve corrosion resistance but sacrifice key mechanical properties. This contradiction hinders the further promotion and application of UHPC in high-performance structures under harsh corrosive environments. Therefore, it is urgent to research a new technical solution that can ensure UHPC possesses mechanical properties comparable to or even surpassing those of metal fiber-reinforced UHPC, while also exhibiting excellent corrosion resistance and durability. Summary of the Invention

[0006] The purpose of this application is to overcome the above-mentioned technical problems and provide a high-strength, high-modulus PE fiber reinforced UHPC board and its preparation method.

[0007] In a first aspect, a high-strength, high-modulus PE fiber reinforced UHPC board comprises reinforcing coated PE fibers, cementing materials, quartz stone, and processing aids; wherein the reinforcing coated PE fibers are formed on the surface of the ultra-high molecular weight polyethylene fiber body by forming a reinforcing layer composed of organopolysilazane, multi-branched polyether modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic resin, 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane, peroxide, and solvent.

[0008] By adopting the above technical solutions, the components in the reinforcing layer work synergistically to achieve a comprehensive improvement in ultra-high molecular weight polyethylene (UHPC) fibers, from "bulk reinforcement" to "interface optimization," ultimately enabling the UHPC board to achieve excellent overall performance. Multi-branched polyether-modified epoxy silicone oil solves the problem of poor compatibility between hydrophobic PE fibers and hydrophilic cementitious matrices, ensuring uniform dispersion of fibers in the UHPC slurry, preventing agglomeration, enhancing the coating's cohesive strength, and establishing strong chemical bonds between the fibers and the matrix, thus improving interfacial bonding. Under peroxide initiation, each component constructs a stable and high-performance coating layer. Methyl vinyl silicone hybrid arylene resin, as a rigid skeleton, contributes high strength and modulus. Organopolysilazane and multi-branched polyether-modified epoxy silicone oil increase the strength and toughness of the crosslinking network. 1,3-bis(3 The (-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane reinforcement network enhances density and crosslinking, improves dispersion uniformity and interfacial bonding with raw materials such as concrete, and further enhances the corrosion resistance and anti-aging properties of the fibers. The reinforced PE fibers form a strong and tough composite material interface with the UHPC matrix, enabling effective load transfer and fully utilizing the high strength and high modulus properties of the fibers. This results in excellent mechanical properties of the UHPC board, with a compressive strength exceeding 100 MPa. Furthermore, due to the barrier effect of the reinforcement layer and the stable interface, its salt and acid corrosion resistance retention rate is over 90%, and its overall performance far surpasses traditional solutions.

[0009] Preferably, the weight ratio of the organopolysilazane, multi-branched polyether modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane is 1:(1.2-2.2):(2.5-3.5):(1.3-3.2).

[0010] By adopting the above technical solution, the weight ratio of organopolysilazane, multi-branched polyether modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane is determined so that each component can better synergistically act on the reinforcing layer under this ratio, further enhancing the performance of the reinforcing layer, thereby improving the strength, modulus, and corrosion resistance of the reinforced PE fiber, and ultimately achieving better macroscopic properties such as compressive strength and salt and acid corrosion resistance retention rate of the high-strength, high-modulus PE fiber reinforced UHPC board.

[0011] Preferably, the amphiphilic active silicone oil is a multi-branched polyether modified epoxy silicone oil.

[0012] By adopting the above technical solution, multi-branched polyether modified epoxy silicone oil solves the problem of poor compatibility between hydrophobic PE fibers and hydrophilic cement matrix. The polyether segment in its multi-branched structure provides strong hydrophilicity, giving the fibers excellent wettability, ensuring that the fibers are uniformly dispersed in UHPC slurry and avoiding agglomeration. The epoxy groups at the ends co-crosslink with the vinyl groups of organopolysilazane and the unsaturated bonds of methyl vinylsilane hybrid aromatic acetylenic resin in the reinforcing layer, enhancing the cohesive strength of the coating. On the other hand, in the later stage of hydration, it reacts with substances such as Ca(OH)2 in the cement matrix to establish a strong chemical bond between the fiber and the matrix, improving the interfacial bonding force.

[0013] Preferably, the relative molecular weight of the ultra-high molecular weight polyethylene fiber in the reinforced PE fiber is 1.2-3 million; the ratio of the wire diameter of the ultra-high molecular weight polyethylene fiber to the thickness of the reinforcing layer is 10:(0.1-1).

[0014] By adopting the above technical solution, the relative molecular weight of PE fibers in the reinforced PE fiber is limited to 1.2-3 million, and the ratio of the wire diameter of ultra-high molecular weight polyethylene fiber to the thickness of the reinforcing layer is limited to 10:(0.1-1). This allows the reinforced PE fiber to work better with cementing materials, quartz stone and processing aids, ensuring that the reinforced PE fiber fully exerts its high strength and high modulus properties in the UHPC board. This helps to improve the macroscopic properties of the UHPC board, such as compressive strength and corrosion resistance, and achieves a comprehensive upgrade of the UHPC board's performance.

[0015] Preferably, the diameter of the reinforced PE fiber is 0.1-1.0 mm and the length is 6-60 mm.

[0016] By adopting the above technical solution, setting the diameter of the reinforced PE fiber to 0.1-1.0 mm and the length to 6-60 mm, the reinforced PE fiber can better cooperate with the UHPC matrix. When mixed with cementitious materials, quartz stone and other raw materials, it is more conducive to forming a strong and tough composite material interface, so that the load can be transferred more effectively. This fully utilizes the high strength and high modulus properties of the fiber and improves the macroscopic properties of UHPC board such as compressive strength and resistance to salt and acid corrosion.

[0017] Preferably, the reinforced coated PE fiber is prepared by the following method: weighing organopolysilazane, multi-branched polyether modified epoxy silicone oil, 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane, and peroxide, mixing and dissolving them in a portion of the solvent to obtain dispersion A; weighing methyl vinylsilyl hybrid aromatic resin and dissolving it in the remaining solvent to obtain dispersion B; thoroughly mixing dispersion A and dispersion B to obtain a reinforcing liquid; immersing ultra-high molecular weight polyethylene fiber filaments in the reinforcing liquid, removing them, allowing the entrained reinforcing liquid to solidify and removing all the solvent to obtain reinforcing filaments; cutting the reinforcing filaments to obtain reinforced coated PE fiber.

[0018] By adopting the above technical solution, weigh out organopolysilazane, multi-branched polyether modified epoxy silicone oil, and 1,3-bis(3-) Dispersion A is obtained by mixing (-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane and peroxide and dissolving them in a portion of the solvent. Dispersion B is obtained by dissolving methyl vinylsilyl hybrid aromatic resin in the remaining solvent. The two are mixed to obtain a reinforcing liquid. Ultra-high molecular weight polyethylene (UHPC) fiber filaments are immersed in the reinforcing liquid, removed, cured, and the solvent is removed before shearing to obtain reinforced coated PE fibers. This preparation method can fully mix the components of the reinforcing layer, ensuring that the reinforcing layer of the reinforced coated PE fibers is uniformly coated on the fiber surface. This allows the components in the reinforcing layer to better exert their synergistic effect, achieving a comprehensive improvement of UHPC fibers from "bulk reinforcement" to "interface optimization". It solves the problem of poor compatibility between hydrophobic PE fibers and hydrophilic cement matrices, enhances the cohesive strength of the coating and the interfacial bonding force between the fiber and the matrix, constructs a stable and high-performance coating layer, improves the corrosion resistance and anti-aging properties of the fibers, and ultimately significantly improves the macroscopic properties of UHPC boards, such as compressive strength and resistance to salt and acid corrosion.

[0019] Preferably, the processing aid includes a combination of water, defoamer, thixotropic agent, and anti-aging agent.

[0020] By adopting the above technical solution, the processing aid contains a combination of various components including water, defoamer, thixotropic agent, and anti-aging agent. This combination helps to fully mix the reinforced PE fiber, cementitious material, quartz stone, and other components. The defoamer reduces air bubbles in the mixture, improving the density and strength of the UHPC board. The thixotropic agent helps to regulate the rheological properties of the material, facilitating construction operations. The anti-aging agent slows down the aging process of the UHPC board, improving its durability, thereby enhancing the overall performance of the high-strength, high-modulus PE fiber reinforced UHPC board.

[0021] Preferably, the cementitious material is composed of cement, ultrafine admixture, and silica fume in a weight ratio of (50-60):(30-33):12.6; the particle size of the ultrafine admixture is 1000-2000 mesh.

[0022] By adopting the above technical solution, cement, ultrafine admixtures, and silica fume in the cementitious material are mixed in a specific weight ratio and the particle size of ultrafine admixtures is controlled. This allows for better interaction with the reinforced PE fiber, quartz stone, and processing aids, further enhancing the bonding force and stress transfer efficiency between interfaces in the UHPC board, improving the overall performance of the UHPC board, and optimizing properties such as strength, corrosion resistance, crack resistance, and wear resistance.

[0023] Preferably, the ultrafine admixture is one or more of the following: quartz powder, mineral powder, fly ash, and stone powder.

[0024] By adopting the above technical solution, one or more of quartz powder, mineral powder, fly ash, and stone powder are used as ultrafine admixtures in the cementitious material. These admixtures are combined with cement and silica fume in a certain weight ratio to form a cementitious material. This material is then used in conjunction with reinforced PE fibers, quartz stone, and processing aids to prepare high-strength, high-modulus PE fiber-reinforced UHPC boards. This allows each component to interact with the cementitious material and quartz stone, further enhancing the interfacial adhesion and stress transfer efficiency. As a result, the overall performance of the UHPC board is comprehensively improved. Not only are the strength and corrosion resistance enhanced, but other related properties such as crack resistance and wear resistance are also optimized due to this synergistic effect. This effectively solves the problems of easy fiber agglomeration and weak interfacial bonding in traditional fiber-reinforced UHPC boards, achieving a comprehensive upgrade of UHPC board performance.

[0025] Secondly, a method for preparing a high-strength, high-modulus PE fiber reinforced UHPC board, which is obtained by the following method: Weigh out the quartz stone, cementitious material, water-reducing agent, and reinforced PE fiber according to the weight parts, mix them evenly, and then add processing aids and mix evenly to obtain PE fiber reinforced matrix. Pour the PE fiber reinforced matrix into a mold, solidify, and mature to obtain UHPC board.

[0026] By adopting the above technical solution, quartz stone, cementing materials, water-reducing agents, reinforcing coated PE fibers and processing aids are mixed, poured, solidified and matured in specific steps, which enables the reinforcing coated PE fibers to fully integrate with the UHPC matrix (cementing materials, quartz stone, etc.) to form a strong and tough composite material interface, effectively transferring loads and giving full play to the high strength and high modulus properties of the fibers, thereby producing high-strength and high-modulus PE fiber reinforced UHPC boards with a compressive strength of over 100MPa and a salt and acid corrosion resistance retention rate of over 90%.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. Multi-branched polyether modified epoxy silicone oil solves the problem of poor compatibility between hydrophobic PE fibers and hydrophilic cement matrix, enabling the fibers to be uniformly dispersed in UHPC slurry, avoiding agglomeration, and improving interfacial bonding through co-crosslinking with the materials in the reinforcing layer and reaction with the cement matrix; 2. Under the initiation of peroxide, each component synergistically constructs a stable and high-performance coating layer. Methyl vinyl silicone hybrid aromatic resin provides high strength and modulus, organopolysilazane and multi-branched polyether modified epoxy silicone oil increase rigidity and flexibility, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane enhances network density and crosslinking degree, thereby improving fiber corrosion resistance and anti-aging properties. 3. The reinforced PE fiber coating forms a strong and tough composite material interface with the UHPC matrix, making the UHPC board compressive strength exceed 100MPa and retaining over 90% of its salt and acid corrosion resistance. Its overall performance far surpasses that of traditional solutions. Detailed Implementation

[0028] The present application will be further described in detail below with reference to the embodiments.

[0029] Some of the original explanations: Organopolysilazane IOTA 9108; IOTA 9108 is a liquid polysilazane containing a silicon nitrogen structure, with functional groups mainly consisting of vinyl groups and silane-hydrogen bonds; Multi-branched polyether modified epoxy silicone oil IOTA IOTA ESM32; Methyl vinyl silicone hybrid aromatic yne resin; molecular weight 1000-5000; .

[0030] Preparation example of reinforced coated PE fibers Preparation Example 1 A reinforced coated PE fiber is prepared by the following method: Weigh out organopolysilazane, multi-branched polyether modified epoxy silicone oil, 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane, and peroxide (initiator BPO), mix and dissolve in ethyl acetate to obtain dispersion A; weigh out methyl vinylsilyl hybrid aromatic yne resin and dissolve in ethylene glycol dimethyl ether to obtain dispersion B; Dispersion A and dispersion B were thoroughly mixed to obtain a reinforcing solution. Ultra-high molecular weight polyethylene (UHMWPE) fiber filaments were immersed in the reinforcing solution, then removed and allowed to solidify by heating at 95°C for 30 minutes. The solvent was then completely removed, and the mixture was heated to 150°C for 10 seconds to obtain reinforcing filaments. These filaments were then cut to obtain reinforced coated PE fibers. The diameter of the reinforced coated PE fibers was 0.2 mm, and the length was 6 mm. The ratio of the UHMWPE fiber diameter to the thickness of the reinforcing layer was 10:0.2.

[0031] The weight ratios of organopolysilazane, multi-branched polyether-modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic yne resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane are 1:2.2:3.5:1.3; the amount (by weight) of ethylene glycol dimethyl ether is equal to that of the methyl vinyl silicone hybrid aromatic yne resin; ethyl acetate accounts for 50 wt% of dispersion A; the amphiphilic active silicone oil is multi-branched polyether-modified epoxy silicone oil; and the amount of peroxide is 10 wt% of the amount of 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane. The relative molecular weight of the ultra-high molecular weight polyethylene fiber in the reinforced coated PE fiber is 1.5 million.

[0032] Preparation Example 2 The difference between Preparation Example 2 and Preparation Example 1 is that the amounts of raw materials are different. Specifically, the weight ratios of organopolysilazane, multi-branched polyether modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane are 1:1.7:3:2.3.

[0033] Preparation Example 3 The difference between Preparation Example 3 and Preparation Example 1 is that the amounts of raw materials are different. Specifically, the weight ratios of organopolysilazane, multi-branched polyether modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane are 1:1.2:2.5:3.3.

[0034] Preparation of comparative examples Preparation of Comparative Example 1 The difference between Comparative Example 1 and Preparation Example 1 is that the organopolysilazane, multi-branched polyether modified epoxy silicone oil, 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane, and peroxide are all replaced in equal amounts with silane coupling agent KH530.

[0035] Preparation of Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the amphiphilic active silicone oil was replaced with an equal amount of organopolysilazane.

[0036] Preparation of Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the organopolysilazane was replaced with an equal amount of amphiphilic active silicone oil.

[0037] Preparation of Comparative Example 4 The difference between Comparative Example 4 and Preparation Example 1 is that the methyl vinylsilyl hybrid aromatic resin was replaced in equal amounts with 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane.

[0038] Example Example 1 A method for preparing a high-strength, high-modulus PE fiber reinforced UHPC board, comprising the following steps: Weigh out 100 parts of quartz stone, 105 parts of cementitious material, 0.5 parts of water-reducing agent (liquid polycarboxylate high-performance water-reducing agent Sika ViscoCrete® 3301 VS), and 40 parts of reinforced PE fiber according to weight, mix them evenly, and then add 30 parts of processing aid and mix evenly to obtain PE fiber reinforced matrix. PE fiber reinforced matrix is ​​poured into a mold, heated to 105℃ for 72 hours, and then cured for 30 days (temperature 30℃, humidity 60%) to obtain UHPC board.

[0039] The processing aid is composed of water, defoamer (organic silicone defoamer S-537 from Shanghai Sanrong Chemical Technology Co., Ltd.), thixotropic agent (BYK-P 2720 rheology modifier), and polyethylene glycol (viscosity-average molecular weight 200-400) in a weight ratio of 9:0.5:0.5.

[0040] The cementitious material consists of cement, ultrafine admixtures, and silica fume in a weight ratio of 56.2:31.2:12.6. The ultrafine admixture has a particle size of 1000-2000 mesh and is composed of quartz powder, mineral powder, and fly ash in a weight ratio of 3:1:1, wherein the quartz powder is 1000 mesh, the mineral powder is 1500 mesh, and the fly ash is 2000 mesh. The quartz sand consists of 120 mesh, 90 mesh, 5 mesh, and 40 mesh quartz sand, with a weight ratio of 22.1:6.6:30.9:40.4 for 120 mesh:90 mesh:5 mesh:40 mesh.

[0041] Example 2-3 The difference between Examples 2-3 and Example 1 is that the amount of raw materials used and the source of the reinforcing PE fiber are different, as shown in Table 1. Table 1 shows the amount (parts by weight) of raw materials used in Examples 1-3 and the source of the reinforcing PE fibers.

[0042] Comparative Example Comparative Examples 1-4 The difference between Comparative Examples 1-4 and Example 1 is that the source of the reinforced PE fiber is different, as shown in Table 2. Table 2 shows the sources of reinforced coated PE fibers in Comparative Examples 1-4.

[0043] Comparative Example 5 The difference between Comparative Example 5 and Example 1 is that the reinforced PE fiber is ultra-high molecular weight polyethylene fiber.

[0044] Comparative Example 6 The difference between Comparative Example 6 and Example 1 is that the reinforced PE fiber is replaced with an equal amount of steel fiber.

[0045] Performance testing

[0046] The UHPC boards obtained in Examples 1-3 and Comparative Examples 1-5 were cut into test samples for the following experiments.

[0047] Compressive strength: Tested according to GB / T 31387-2015. A compressive strength greater than 100MPa is considered qualified.

[0048] Salt corrosion resistance: The test sample was completely immersed in a 5% saline solution (pH 7) at 45°C for 7 days. After removal, it was naturally air-dried for 7 days. The above process was repeated 5 times before the compressive strength was tested and the compressive strength retention rate was calculated.

[0049] Acid corrosion resistance: The test specimen was completely immersed in a sulfuric acid solution with a pH of 3.5 at 35°C for 7 days. After being removed, it was naturally dried for 7 days. This process was repeated 3 times before the compressive strength was tested again, and the compressive strength retention rate was calculated.

[0050] The specific experimental data are shown in Table 3. Table 3. Experimental data of Examples 1-3 and Comparative Examples 1-5

[0051] Combining Example 1 and Comparative Examples 1-5 with Table 3, it can be seen that the compressive strength of Comparative Examples 1-5 all failed to meet the requirements, and the compressive strength retention rate of Comparative Examples 1-5 was lower than that of Example 1. This indicates that the reinforcing layer formed on the surface of ultra-high molecular weight polyethylene fiber by compounding the organopolysilazane, amphiphilic active silicone oil, methyl vinyl silicone hybrid aromatic resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane of this application has high strength, corrosion resistance, aging resistance, dispersibility, and bonding stability with the UHPC board raw material system. Therefore, in conjunction with cementing materials, quartz stone, etc., the produced UHPC board has high compressive strength and durability.

[0052] Combining Example 1 and Comparative Example 6 with Table 3, it can be seen that the compressive strength retention rate of Comparative Example 5 is lower than that of Example 1, indicating that the reinforced coated PE fiber prepared by this application has better dispersion, compatibility, high strength, corrosion resistance, weather resistance and other properties.

[0053] 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-modulus PE fiber reinforced UHPC board, characterized in that, It is prepared from the following raw materials in parts by weight: Quartz stone: 100-120 parts Cementitious material: 90-105 parts Water-reducing agent: 0.3-0.5 parts Processing aids: 30-40 parts Reinforced PE fiber coating: 40-50 parts; The reinforced PE fiber comprises ultra-high molecular weight polyethylene fiber and a reinforcing layer coated on the surface of the ultra-high molecular weight polyethylene fiber, wherein the relative molecular weight of the ultra-high molecular weight polyethylene fiber is greater than 1 million; the reinforcing layer is prepared from organopolysilazane, amphiphilic active silicone oil, methyl vinylsilyl hybrid aromatic acetylenic resin, 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane, peroxide, and solvent.

2. The high-strength, high-modulus PE fiber-reinforced UHPC board according to claim 1, characterized in that: The weight ratio of the organopolysilazane, multi-branched polyether modified epoxy silicone oil, methyl vinyl silicone hybrid aromatic resin, and 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane is 1:(1.2-2.2):(2.5-3.5):(1.3-3.2).

3. The high-strength, high-modulus PE fiber reinforced UHPC board according to claim 1, characterized in that: The amphiphilic active silicone oil is a multi-branched polyether modified epoxy silicone oil.

4. The high-strength, high-modulus PE fiber-reinforced UHPC board according to claim 1, characterized in that: The relative molecular weight of the ultra-high molecular weight polyethylene fiber in the reinforced PE fiber is 1.2-3 million; the ratio of the wire diameter of the ultra-high molecular weight polyethylene fiber to the thickness of the reinforcing layer is 10:(0.1-1).

5. The high-strength, high-modulus PE fiber reinforced UHPC board according to claim 1, characterized in that: The diameter of the reinforced PE fiber is 0.1-1.0 mm and the length is 6-60 mm.

6. A high-strength, high-modulus PE fiber-reinforced UHPC board according to any one of claims 1-5, characterized in that, The reinforced coated PE fiber is obtained by the following method: Weigh out organopolysilazane, multi-branched polyether modified epoxy silicone oil, 1,3-bis(3-methacryloyloxypropyl)tetra(trimethylsiloxy)disiloxane, and peroxide, mix and dissolve in part of the solvent to obtain dispersion A; weigh out methyl vinylsilyl hybrid aromatic yne resin and dissolve in the remaining solvent to obtain dispersion B; Dispersion A and dispersion B are thoroughly mixed to obtain a reinforcing liquid; ultra-high molecular weight polyethylene fiber filaments are immersed in the reinforcing liquid, and after being taken out, the entrained reinforcing liquid is solidified and all solvent is removed to obtain reinforcing filaments; the reinforcing filaments are cut to obtain reinforced coated PE fibers.

7. The high-strength, high-modulus PE fiber-reinforced UHPC board according to claim 1, characterized in that: The processing aid is a combination of multiple substances selected from water, defoamer, thixotropic agent, anti-aging agent, and dispersant.

8. The high-strength, high-modulus PE fiber-reinforced UHPC board according to claim 1, characterized in that: The cementitious material is composed of cement, ultrafine admixture, and silica fume in a weight ratio of (50-60):(30-33):12.6; the particle size of the ultrafine admixture is 1000-2000 mesh.

9. A high-strength, high-modulus PE fiber-reinforced UHPC board according to claim 8, characterized in that: The ultrafine admixture is one or more of the following: quartz powder, mineral powder, fly ash, and stone powder.

10. A method for preparing a high-strength, high-modulus PE fiber reinforced UHPC board as described in any one of claims 1-9, characterized in that, It is prepared by the following method: Weigh out the quartz stone, cementitious material, water-reducing agent, and reinforced PE fiber according to the weight parts, mix them evenly, and then add the processing aid and mix evenly to obtain PE fiber reinforced matrix. PE fiber reinforced matrix is ​​poured into a mold, solidified, and cured to obtain UHPC board.

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