A concrete corrosion-proof structure and a preparation method thereof

Abstract

The application discloses a concrete anti-corrosion structure and a preparation method thereof, and comprises a first structure layer, a second structure layer and a third structure layer which are sequentially arranged in layers; the surface of the first structure layer; the second structure layer is used for absorbing stress; and the third structure layer is used for blocking the penetration of chloride ions and moisture; wherein, the second structure layer is provided with a buffer structure which is embedded in the second structure layer. The layered structure design improves the adhesion of the anti-corrosion structure, enhances the toughness of the anti-corrosion structure, and prolongs the service life of the anti-corrosion structure.

Description

Technical Field

[0001] This invention relates to the technical field of building corrosion protection, and particularly to a concrete corrosion protection structure and a method for preparing the corrosion protection structure. Background Technology

[0002] Concrete structures in saline-alkali environments, such as bridge piers, harbor wharves, seawalls, and wind power infrastructure, are subjected to extremely severe combined erosion tests over a long period of time. On the one hand, high concentrations of chloride ions and moisture in the air can penetrate into the concrete, causing steel corrosion and damage to the concrete structure. On the other hand, strong ultraviolet radiation, huge diurnal temperature differences, and wet-dry cycles can cause physical aging and stress damage to the protective coating.

[0003] Currently, commonly used anti-corrosion coatings on the market, such as epoxy and polyurethane coatings, have the following insurmountable defects when dealing with this type of complex erosion: 1. Poor adhesion and easy peeling: Concrete substrates are usually highly alkaline and contain moisture, making it difficult for ordinary coatings to effectively wet and penetrate, resulting in weak bonding with the concrete substrate and easy blistering and peeling problems after a long time; 2. Excessive rigidity and insufficient toughness: Traditional coatings are mostly rigid or semi-rigid after curing, which cannot effectively adapt to the thermal expansion and contraction of the concrete substrate due to temperature changes; when micro-cracks appear in the substrate, the rigid coating will be torn apart, forming an invasion channel for corrosive media, leading to the "one point broken, the whole line destroyed" of the anti-corrosion system; 3. Insufficient weather resistance and short lifespan: Under strong ultraviolet radiation and high salt spray environments, the organic polymer chains of ordinary coatings are prone to breakage, leading to powdering, discoloration, and loss of gloss, and rapid loss of protective ability; Therefore, it is necessary to develop an anti-corrosion structure that can simultaneously solve the three major problems of poor adhesion, crack resistance, and long-term weather resistance. Summary of the Invention

[0004] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, the object of the present invention is to provide a concrete anti-corrosion structure that improves the adhesion and toughness of the anti-corrosion structure, and significantly extends its service life.

[0005] The present invention also provides a method for preparing the above-mentioned anti-corrosion structure.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A concrete corrosion-resistant structure, comprising: A first structural layer, a second structural layer, and a third structural layer are stacked sequentially. The surface of the first structural layer is used to absorb stress. The second structural layer is used to block chloride ions and moisture penetration. The second structural layer is provided with a buffer structure, which is embedded within the second structural layer.

[0007] The beneficial effects of the concrete anti-corrosion structure provided by this invention are as follows: This solution adopts a layered structural design. First, the first structural layer forms a firm bond with the surface of the concrete substrate, effectively solving the problems of poor adhesion and easy blistering and peeling of traditional coatings on the surface of highly alkaline and moisture-containing concrete substrates, thus improving the adhesion of the anti-corrosion structure. Second, the second structural layer and its internally embedded buffer structure absorb and disperse stress to adapt to the thermal expansion and contraction of concrete caused by temperature changes and the expansion of micro-cracks, preventing the anti-corrosion structure from being torn and overcoming the failure mode of "one point broken, the whole line destroyed," thereby enhancing the toughness of the anti-corrosion structure. Third, the physical barrier formed by the third structural layer blocks the penetration of chloride ions and moisture, effectively improving the weather resistance of the anti-corrosion structure, delaying the aging failure of the anti-corrosion structure under ultraviolet radiation and high salt spray environments, and extending the service life of the anti-corrosion structure.

[0008] As described above, in a concrete anti-corrosion structure, the buffer structure has multiple mesh openings, which are arranged regularly along a first direction and a second direction to form a three-dimensional mesh structure.

[0009] In the concrete anti-corrosion structure described above, the mesh is square, and the side length L1 of the mesh ranges from 2mm to 5mm.

[0010] As described above, a concrete anti-corrosion structure includes a buffer structure comprising multiple separated buffer modules, with adjacent buffer modules spaced at equal intervals, and the spacing L2 between adjacent buffer modules ranging from 20mm to 30mm.

[0011] In the concrete anti-corrosion structure described above, the buffer module is a square module, and the side length L3 of the buffer module ranges from 500mm to 800mm.

[0012] As described above, in a concrete anti-corrosion structure, the thickness S1 of the buffer structure ranges from 100μm to 250μm along the third direction; the buffer structure is made of fiber material, which is glass fiber or basalt fiber.

[0013] In the concrete anti-corrosion structure described above, the thickness S2 of the second structural layer along the third direction ranges from 0.3mm to 1.2mm; the second structural layer is made of polyurea elastomer material or polyurethane elastomer material.

[0014] In the concrete anti-corrosion structure described above, the thickness S3 of the third structural layer along the third direction ranges from 0.3mm to 0.5mm, and the material of the third structural layer is fluorocarbon resin or polysiloxane resin.

[0015] In the concrete anti-corrosion structure described above, the thickness S4 of the first structural layer ranges from 0.1mm to 0.8mm, and the material of the first structural layer is epoxy resin or silane-modified polymer.

[0016] The present invention provides a preparation method for preparing a concrete anti-corrosion structure as described above, comprising the following steps: Pretreatment: The surface of the concrete substrate is pretreated by sandblasting, grinding or high-pressure water jetting to remove surface laitance, oil and loose layer, ensuring that the surface of the concrete substrate is clean, rough and free of standing water; First structural layer coating: The prepared first structural layer material is evenly applied to the surface of the concrete substrate by roller coating, brush coating or spraying and then cured; The first step of the second structural layer coating process: The second structural layer is divided into a first step and a second step for coating. After the first structural layer is completely cured, the material of the first second structural layer is applied by spraying. Laying the buffer structure: Before the material of the first layer of the second structural layer has fully cured, the buffer structure is laid so that it is embedded in the material of the first layer of the second structural layer; The second process of coating the second structural layer: After the buffer structure is laid, the second layer of the material of the second structural layer is sprayed immediately, so that the buffer structure is completely wrapped by the material of the second structural layer without any exposed parts, and then the whole structure is cured. Coating of the third structural layer: After the second structural layer has fully cured, the third structural layer is applied by spraying or rolling and then cured.

[0017] According to the preparation method described above, the first structural layer comprises the following components: epoxy resin material or silane modified polymer material: 60-80 parts by weight; curing agent: 15-25 parts by weight; penetration promoter: 3-8 parts by weight; coupling agent: 1-5 parts by weight.

[0018] According to the preparation method described above, the second structural layer comprises the following components: 100 parts by weight of polyurea elastomer material or polyurethane elastomer material; 5-15 parts by weight of nano-scale filler; 3-10 parts by weight of plasticizer; and 1-3 parts by weight of ultraviolet absorber.

[0019] In one of the preparation methods described above, the nanoscale filler is one or more of nano-silica, nano-calcium carbonate, and nano-alumina.

[0020] According to the preparation method described above, the third structural layer comprises the following components: 70-85 parts by weight of fluorocarbon resin material or polysiloxane resin material; 10-20 parts by weight of pigments and fillers; and 2-8 parts by weight of additives.

[0021] The beneficial effects of the preparation method provided by this invention are: This solution constructs a multi-layered anti-corrosion structure by sequentially forming a first, second, and third structural layer, with a buffer structure embedded between the two processes of the second structural layer. This buffer structure is completely encapsulated within the second structural layer without any exposed areas, thus creating a synergistic effect between the layers. The first structural layer, after pretreatment, is directly applied to a clean, rough concrete substrate surface, achieving efficient wetting and firm anchoring. This effectively overcomes the shortcomings of existing coatings that easily blister and peel off on highly alkaline or moisture-containing substrates, significantly improving the adhesion of the anti-corrosion structure. The second structural layer is applied in stages with an embedded buffer structure, and after curing, it forms a rigid and tough structure. The stress buffer layer absorbs and disperses the deformation stress generated by temperature changes or the expansion of microcracks in the concrete substrate, preventing the anti-corrosion structure from being torn apart and overcoming the failure mode of "one point breaks, the whole line is destroyed". The third structural layer, as the outer physical barrier, is applied after the second structural layer has fully cured, forming a dense physical barrier layer that can resist the penetration of corrosive media such as chloride ions and moisture for a long time. It is set independently of the second structural layer, avoiding the contradiction that a single structural layer cannot balance weather resistance and mechanical properties. It effectively improves the weather resistance of the anti-corrosion structure, delays the aging failure of the anti-corrosion structure in ultraviolet and high salt spray environments, and extends the service life of the anti-corrosion structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 For the corresponding Figure 1 A structural diagram from another direction; Figure 3 This is a structural cross-sectional view of an embodiment of the present invention; Figure 4 This is a cross-sectional view of the structure from another direction according to an embodiment of the present invention; Figure 5 This is a cross-sectional view of the continuous buffer structure corresponding to an embodiment of the present invention; Figure 6 This is a comparison test diagram of the crack resistance performance of an embodiment of the present invention; Figure 7 This is a diagram showing the state of the corrosion resistance performance comparison test in an embodiment of the present invention.

[0023] Reference numerals: 100-first structural layer; 200-second structural layer; 210-buffer structure; 211-buffer module; 2111-mesh; 300-third structural layer; 400-concrete substrate. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0026] In the description of this application, if words such as several, greater than, less than, exceeding, above, below, or within appear, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, and "above," "below," "within," etc. are understood to include the number itself.

[0027] In the description of this application, the use of terms such as "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0028] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0029] like Figures 1-7 As shown in the figure, an embodiment of the present invention provides a concrete anti-corrosion structure, comprising: The first structural layer 100, the second structural layer 200 and the third structural layer 300 are stacked in sequence. The first structural layer 100 is used to connect the surface of the concrete substrate 400, the second structural layer 200 is used to absorb stress, and the third structural layer 300 is used to block chloride ions and moisture penetration. The second structural layer 200 is provided with a buffer structure 210, which is embedded in the second structural layer 200.

[0030] In this embodiment of the invention, firstly, after the material of the first structural layer 100 is prepared, it is uniformly applied to the surface of the concrete substrate 400 by roller coating, brush coating, or spray coating. After the first structural layer 100 penetrates the surface of the concrete substrate 400 and cures, a micro-wedge structure is formed between the first structural layer 100 and the surface of the concrete substrate 400, so that the first structural layer 100 and the concrete substrate 400 are physically locked together, thereby improving adhesion and enhancing the stability of the connection of the first structural layer 100. Secondly, after the material of the second structural layer 200 is prepared, it is applied to the second side of the first structural layer 100 by spray coating and the buffer structure 210 is embedded, so that the second structural layer 200 completely covers the outside of the buffer structure 210 and is cured, thereby ensuring the stability of the second structural layer 200 in absorbing stress. Thirdly, after the material of the third structural layer 300 is prepared, it is applied to one side of the second structural layer 200 by spray coating or roller coating, ensuring that the coating is uniform, dense, and free of pinholes, thereby improving the ability of the third structural layer 300 to block chloride ions and moisture penetration and enhancing the sealing performance of the anti-corrosion structure.

[0031] The anti-corrosion structure of this invention adopts a layered structural design. First, the first structural layer 100 forms a firm bond with the surface of the concrete substrate 400, effectively solving the problems of poor adhesion and easy blistering and peeling of traditional coatings on the surface of highly alkaline and moisture-containing concrete substrate 400, thus improving the adhesion of the anti-corrosion structure. Second, the second structural layer 200 and the buffer structure 210 embedded therein absorb and disperse stress to adapt to the thermal expansion and contraction of concrete caused by temperature changes and the expansion of micro-cracks, preventing the anti-corrosion structure from being torn and overcoming the failure mode of "one point broken, the whole line destroyed", thus enhancing the toughness of the anti-corrosion structure. Third, the physical barrier formed by the third structural layer 300 blocks the penetration of chloride ions and moisture, effectively improving the weather resistance of the anti-corrosion structure, delaying the aging failure of the anti-corrosion structure in ultraviolet and high salt spray environments, and extending the service life of the anti-corrosion structure.

[0032] Specifically, such as Figures 4-5 As shown, the buffer structure 210 has multiple mesh openings 2111, which are arranged regularly along the first and second directions to form a three-dimensional mesh structure.

[0033] In this embodiment of the invention, the buffer structure 210 is provided with a plurality of mesh openings 2111, which are arranged regularly along the first and second directions to form a three-dimensional mesh structure to construct a miniature spatial truss system. When the three-dimensional mesh structure is subjected to normal pressure, the walls of the mesh openings 2111 can bend and deform to absorb energy. When subjected to in-plane shear force, the three-dimensional mesh structure dissipates energy through node rotation and structural deformation, thereby achieving multi-directional and multi-dimensional stress absorption and dispersion capabilities, effectively enhancing the stability of the anti-corrosion structure.

[0034] Furthermore, such asFigures 4-5 As shown, the mesh 2111 is a square hole, and the side length L1 of the mesh 2111 is in the range of 2mm to 5mm.

[0035] In this embodiment of the invention, when the side length L1 is less than 2mm, the mesh is too dense, which can easily lead to an increase in the overall stiffness of the buffer structure 210, an increase in brittleness, and a decrease in the buffering effect. At the same time, the mesh 2111 is too small, which is not conducive to the full wetting and filling of the material of the second structural layer 200. When the side length L1 is greater than 5mm, the mesh 2111 is too large, the ability of the buffer structure 210 to disperse shear stress is weakened, and local areas may undergo excessive deformation due to lack of support, which is not conducive to the reset of the buffer structure 210. When the side length L1 of the mesh 2111 is in the range of 2mm to 5mm, when the anti-corrosion structure is subjected to impact load, the impact energy can be effectively absorbed and dissipated through the plastic deformation of the hole wall of the mesh 2111 and the stress concentration release mechanism of the hole corner, thereby improving the reliability of the anti-corrosion structure.

[0036] Furthermore, such as Figures 4-5 As shown, the buffer structure 210 includes multiple separated buffer modules 211, which are equidistantly spaced from each other, and the spacing L2 between two adjacent buffer modules 211 ranges from 20mm to 30mm.

[0037] In this embodiment of the invention, the buffer structure 210 serves as the reinforcing skeleton of the second structural layer 200. The buffer structure 210 is segmented with gaps between segments, allowing multiple buffer structures 210 to suppress cracks at the microscale. At the same time, the elastic filling area between adjacent buffer modules 211 can also serve as an expansion joint of the anti-corrosion structure to absorb the macroscopic expansion and contraction energy of the concrete substrate 400 caused by large-area temperature changes. Meanwhile, the multiple segmented buffer modules 211 cleverly solve the problems of wrinkles, fractures, or stress concentration that may occur under long-term stress when using a continuously designed buffer structure 210, ensuring the long-term stability and integrity of the entire anti-corrosion structure under large-area application.

[0038] In this embodiment of the invention, when the spacing L2 is less than 20mm, the small spacing can easily lead to enhanced interaction between modules, losing the stress-blocking effect of modular separation, and the overall structure tends to be continuous. When the spacing L2 is greater than 30mm, the large spacing can easily lead to the formation of excessively long flexible bands in the interval area, which may become weak links for stress concentration or deformation, reducing the overall structural stiffness of the anti-corrosion structure. When the spacing L2 is in the range of 20mm to 30mm, it provides sufficient space for the material of the second structural layer 200 to form continuous "flexible hinges" with a certain thickness. These flexible hinges can not only absorb deformation in all directions, but also dissipate a large amount of energy through their own viscoelastic deformation when subjected to impact, significantly improving the impact resistance of the anti-corrosion structure.

[0039] In other embodiments, a buffer structure 210 with multiple separated buffer modules 211 or a continuously designed buffer structure 210 can be selected according to specific actual needs to improve the flexibility of the anti-corrosion structure.

[0040] Furthermore, such as Figures 4-5 As shown, the buffer module 211 is a square module, and the side length L3 of the buffer module 211 ranges from 500mm to 800mm.

[0041] In this embodiment of the invention, when the side length L3 is less than 500mm, the number of parts will increase, leading to increased installation workload and excessive gaps. When the side length L3 is greater than 800mm, the buffer module 211 is prone to being too heavy and large, making it inconvenient for transportation and single-person operation on site, and the impact range of a single buffer module 211 failure is too large. When the side length L3 is in the range of 500mm to 800mm, it forms a good modular relationship with the structural dimensions of conventional concrete facilities (such as the width or span of beams, columns, and walls). This design allows the modules to be arranged in integer multiples or half-integer multiples according to the actual structural dimensions when laying the buffer structure 210, minimizing the use of non-standard buffer modules 211 to ensure the regularity of the anti-corrosion structure and the continuity of stress transmission.

[0042] Furthermore, such as Figures 2-3 As shown, along the third direction, the thickness S1 of the buffer structure 210 ranges from 100μm to 250μm; the buffer structure 210 is made of fiber material, which is glass fiber or basalt fiber.

[0043] It should be noted that the first direction mentioned above is the X direction in the attached figure, the second direction mentioned above is the Y direction in the attached figure, and the third direction mentioned above is the Z direction in the attached figure; specifically, the first direction, the second direction, and the third direction are perpendicular to each other; as an example, the first direction is parallel to the length direction of the anti-corrosion structure, the second direction is the width direction of the anti-corrosion structure, and the third direction is a direction that is perpendicular to both the first and second directions.

[0044] In this embodiment of the invention, when the thickness S1 is less than 100 μm, the three-dimensional mesh structure is too thin and lacks sufficient stiffness, making it difficult to effectively disperse stress; when the thickness S1 is greater than 250 μm, the structure is too thick, which easily weakens the overall elasticity of the second structural layer 200, reduces the buffering effect, and increases material costs and structural weight; preferably, the thickness S1 is 150 μm, so that the three-dimensional mesh structure has a suitable moment of inertia, which can effectively resist compressive and shear loads, and can achieve efficient energy dissipation through stable elastic buckling, avoiding insufficient stiffness caused by being too thin or increased brittleness caused by being too thick, thus improving the reliability of the buffer structure 210.

[0045] In this embodiment of the invention, glass fiber or basalt fiber is used as the constituent material of the buffer structure 210, which has excellent corrosion resistance and mechanical properties; glass fiber has a lower cost and is suitable for general corrosive environments; basalt fiber has higher alkali resistance and high temperature resistance, and the production process is more environmentally friendly, making it particularly suitable for highly alkaline, frequently alternating wet and dry saline-alkali environments, thereby improving the flexibility of the buffer structure 210 in use.

[0046] In this embodiment of the invention, the diameter of the single filament of glass fiber or basalt fiber is 50μm~250μm, so that the glass fiber or basalt fiber has a suitable specific surface area and bending stiffness to form a stable buffer structure 210.

[0047] Furthermore, such as Figures 2-3 As shown, along the third direction, the thickness S2 of the second structural layer 200 ranges from 0.3 mm to 1.2 mm; the second structural layer 200 is made of polyurea elastomer material or polyurethane elastomer material.

[0048] In this embodiment of the invention, when the thickness S2 is less than 0.3 mm, the second structural layer 200 is too thin to completely cover and anchor the buffer structure 210, thus limiting the buffering effect. When the thickness S2 is greater than 1.2 mm, although it can provide stronger buffering, it will increase material costs, prolong the construction period, and cause internal stress accumulation due to excessive coating thickness, thereby reducing the buffering effect. Preferably, the thickness S2 is 1 mm, which allows the second structural layer 200 to achieve this thickness in one or multiple sprayings using an airless spraying device while providing sufficient mechanical properties. The coating surface can self-level to form a smooth and uniform film, providing a high-quality substrate for the subsequent coating of the third structural layer 300, and ensuring the interlayer adhesion and appearance consistency of the entire anti-corrosion structure.

[0049] In this embodiment of the invention, the second structural layer 200 is made of polyurea elastomer or polyurethane elastomer, which makes the buffer structure 210 made of glass fiber or basalt fiber have good interfacial compatibility with the second structural layer 200, forming a tightly bonded composite material and improving the stability of the anti-corrosion structure.

[0050] Furthermore, such as Figures 2-3 As shown, along the third direction, the thickness S3 of the third structural layer 300 ranges from 0.3mm to 0.5mm, and the material of the third structural layer 300 is fluorocarbon resin or polysiloxane resin.

[0051] In this embodiment of the invention, the third structural layer 300 is a dense protective layer. When the thickness S3 is less than 0.3 mm, the thickness is too thin and it is difficult to ensure the absolute density of the coating of the third structural layer 300. Microscopic pinholes may exist, which can become channels for the penetration of corrosive agents. When the thickness S3 is greater than 0.5 mm, the thickness is too thick and it is easy to cause cracking due to the increased internal stress of the third structural layer 300, while also increasing the cost. When the thickness S3 is in the range of 0.3 mm to 0.5 mm, it can be achieved by one or two sprayings, and the quality is easy to control.

[0052] In this embodiment of the invention, the material of the third structural layer 300 is fluorocarbon resin or polysiloxane resin. Fluorocarbon resin or polysiloxane resin has extremely low surface energy, which makes the third structural layer 300 have good hydrophobic and oleophobic properties. This makes it difficult for moisture and pollutants to adhere to and remain on the surface, and it is easy to self-clean under the action of rain or wind. This reduces the accumulation and long-term contact of corrosive ions on the coating surface, improves the physical shielding ability of the third structural layer 300, reduces the risk of corrosion from the source, and extends the service life of the anti-corrosion structure.

[0053] Furthermore, the thickness S4 of the first structural layer 100 ranges from 0.1 mm to 0.8 mm, and the material of the first structural layer 100 is epoxy resin or silane-modified polymer.

[0054] In this embodiment of the invention, the first structural layer 100 is a penetrating anchoring layer. The epoxy resin material has excellent bonding strength, chemical stability, and good wettability to the concrete substrate 400, and can form a penetrating anchoring layer with high adhesion. The silane-modified polymer material has lower viscosity and better permeability, and can penetrate deep into the capillary pores of the concrete substrate 400 to form an integrated "anchoring-sealing" penetrating anchoring layer. It can be selected according to the actual situation to improve the flexibility of the anti-corrosion structure. Preferably, for the concrete substrate 400 with a dense surface and low porosity, the thickness S4 can be a low thickness of 0.1mm to 0.3mm, which mainly serves as an interface connection. For old concrete with a loose surface and many microcracks, the thickness S4 can be a high thickness of 0.5mm to 0.8mm. Through multiple coatings, strong penetration and leveling are achieved to seal microcracks and prevent salt and moisture from penetrating back from the concrete substrate 400 side, thereby further improving the reliability and flexibility of the anti-corrosion structure.

[0055] The present invention provides a preparation method for preparing the above-mentioned concrete anti-corrosion structure, comprising the following steps: (1) Pretreatment: The surface of the concrete substrate 400 is pretreated by sandblasting, grinding or high-pressure water jetting to remove surface laitance, oil stains and loose layer, so as to ensure that the surface of the concrete substrate 400 is clean, rough and free of water, so as to construct a micro-rough surface and improve the adhesion between the first structural layer 100 and the surface of the concrete substrate 400.

[0056] (2) Coating of the first structural layer 100: The prepared first structural layer 100 material is uniformly coated on the surface of the concrete substrate 400 by roller coating, brush coating or spraying and then cured; wherein, the wet film thickness of the first structural layer 100 is controlled between 100μm and 200μm, the ambient temperature during construction is controlled between 5℃ and 35℃, and the relative humidity is ≤85%, so as to ensure that the thickness S4 of the first structural layer 100 after curing is within the range of 0.1mm to 0.8mm, thereby improving the consistency of the thickness S4 of the first structural layer 100.

[0057] (3) First coating process of the second structural layer 200: The second structural layer 200 is divided into a first process and a second process for coating. After the first structural layer 100 is completely cured, the first layer of the second structural layer 200 is applied by spraying. The spraying pressure is controlled at 15MPa~25MPa and the spraying temperature is controlled at 40℃~70℃ to ensure that the material of the second structural layer 200 is well atomized and forms a uniform film.

[0058] (4) Laying of buffer structure 210: When the material of the first second structural layer 200 has not been completely cured (the surface is dry but the inside is not completely dry), the buffer structure 210 is laid so that it is embedded in the material of the first second structural layer 200, ensuring that each buffer module 211 of the buffer structure 210 is laid flat and without wrinkles, thereby improving the long-term stability of the buffer structure 210; in addition, during the laying of each buffer module 211, a gap of 20mm~30mm should be reserved between two adjacent buffer modules 211 to ensure the consistency of the laying.

[0059] In some other embodiments, if a continuous buffer structure 210 is used, it is necessary to ensure that it is laid flat and without wrinkles in order to improve the long-term stability of the buffer structure 210.

[0060] (5) Second coating process of the second structural layer 200: After the buffer structure 210 is laid, the second layer of the second structural layer 200 material is sprayed immediately, so that the buffer structure 210 is completely wrapped by the material of the second structural layer 200 without any exposure, forming a complete second structural layer 200. Then, the whole is cured, which effectively avoids the risk of delamination between the buffer structure 210 and the substrate of the second structural layer 200 due to the construction interval, and improves the stability of the second structural layer 200.

[0061] (6) Coating of the third structural layer 300: After the second structural layer 200 is fully cured, the third structural layer 300 is coated by spraying or rolling and then cured; it is necessary to ensure the uniformity and density of the coating of the third structural layer 300 and to ensure that there are no pinholes, so that moisture and contaminants are difficult to adhere to and remain on the surface, thereby improving the physical isolation and shielding effect of the third structural layer 300. Specifically, the first structural layer 100 comprises the following components: 60-80 parts by weight of epoxy resin material or silane-modified polymer material, preferably bisphenol A type epoxy resin material with an epoxy equivalent of 180 g / eq to 210 g / eq and a viscosity of 300 mPa·s to 800 mPa·s at 25°C to ensure good permeability and wettability; and 15-25 parts by weight of curing agent, which can be selected from polyamide curing agent or aliphatic amine curing agent, to better penetrate into the capillary of the concrete substrate. The first structural layer 100 is formed by pores to reduce the risk of detachment of the concrete substrate 400 due to moisture; a penetration enhancer: 3 to 8 parts by weight, preferably an active diluent such as C12-C14 alkyl glycidyl ether, is used to further reduce the surface tension of the concrete substrate 400 and enhance its wetting ability to moist and alkaline concrete substrate 400; a coupling agent: 1 to 5 parts by weight, preferably a silane coupling agent such as γ-aminopropyltriethoxysilane, is used to enhance the chemical bond between the first structural layer 100 and the concrete substrate 400.

[0062] In some other embodiments, other components may be added to the first structural layer 100 to improve the applicability of the first structural layer 100.

[0063] Further, the second structural layer 200 comprises the following components: 100 parts by weight of polyurea elastomer or polyurethane elastomer material, wherein the elastomer has an elongation at break ≥400%, a tensile strength ≥15MPa, and a Shore hardness of 70A~85A, to ensure that the second structural layer 200 has both sufficient flexibility to deform and sufficient strength to bear stress; 5~15 parts by weight of nano-filler, which may be one or more of nano-silica, nano-calcium carbonate, or nano-alumina, to improve the mechanical properties and wear resistance of the second structural layer 200; 3~10 parts by weight of plasticizer, preferably acetylated tributyl citrate (ATBC) or tributyl citrate (TBC), to adjust the softness of the second structural layer 200; and 1~3 parts by weight of ultraviolet absorber, preferably a benzotriazole ultraviolet absorber, to improve the aging resistance of the second structural layer 200.

[0064] In some other embodiments, the second structural layer 200 may also have other components added to improve its applicability.

[0065] Further, the third structural layer 300 comprises the following components: 70-85 parts by weight of fluorocarbon resin material or polysiloxane resin material, preferably fluoroolefin-vinyl ether copolymer (FEVE) or polyvinylidene fluoride (PVDF). Fluoride (fluorocarbon resin material), wherein the solid content is ≥70% to give the third structural layer 300 excellent weather resistance and chemical stability; pigments and fillers: 10~20 parts by weight, one or more of rutile titanium dioxide, wet-process sericite or precipitated barium sulfate can be selected to adjust the color and gloss of the third structural layer 300, while enhancing the physical shielding ability; additives: 2~8 parts by weight, including leveling agents, defoamers, etc., to improve the construction performance and film quality of the third structural layer 300; when FEVE fluorocarbon resin material is selected, curing agent: 5~12 parts by weight, HDI biuret (such as hexamethylene diisocyanate biuret) or HDI trimer (such as hexamethylene diisocyanate trimer) can be selected to improve the density, mechanical strength and chemical corrosion resistance of the third structural layer 300; in addition, when PVDF fluorocarbon resin material is selected, because PVDF fluorocarbon resin material melts at high temperature and solidifies after cooling, no curing agent is required.

[0066] In some other embodiments, the third structural layer 300 may also have other components added to improve its applicability.

[0067] To verify the superiority of the concrete anti-corrosion structure provided by the present invention over the prior art, performance comparison tests were conducted on the three key structural layers: the first structural layer 100, the buffer structure 210, and the third structural layer 300.

[0068] Experiment (1): Adhesion Comparison Test Two groups of samples were prepared. The structure of the control group A1 was as follows: a first layer of polyurea elastomer material with a thickness of 0.5 mm was directly coated on the concrete substrate 400; a buffer structure 210 with a side length L1 of 4 mm and made of glass fiber mesh was laid; a second layer of polyurea elastomer material with a thickness of 0.5 mm was coated to form a second structural layer 200; and finally, a third structural layer 300 with a thickness of 0.4 mm and made of fluorocarbon resin material was coated. The control group A1 lacked the first structural layer 100 in this scheme. The structure of the experimental group A2 was as follows: a first layer of polyurea elastomer material with a thickness S4 of 0 mm was coated. A first structural layer 100, 5mm thick and made of epoxy resin, is then coated with a first layer of polyurea elastomer material with a thickness of 0.5mm. A buffer structure 210, with a mesh size 2111 and a side length L1 of 4mm, made of fiberglass mesh, is then laid. A second structural layer 200, also 0.5mm thick, is formed by coating with a second layer of polyurea elastomer material. Finally, a third structural layer 300, 0.4mm thick and made of fluorocarbon resin material, is coated. Experimental group A2 represents the complete structure of this embodiment. The concrete substrate 400 is a C30 concrete specimen, with its surface sandblasted to a roughness R. Z 50μm.

[0069] Two groups of samples were cured for 7 days at 23±2℃ and 50% relative humidity before being tested. The test was conducted according to GB / T5210-2006 "Paints and Varnishes - Pull-off Adhesion Test", using a pull-off adhesion tester. Five samples were tested in each group and the average value was taken.

[0070] Tests revealed that the adhesion of the control group A1 without the first structural layer 100 was 1.3 MPa, and the failure mode was interface failure, meaning that the anti-corrosion structure separated from the concrete substrate 400 at the interface; the adhesion of the experimental group A2 with the first structural layer 100 was 3.6 MPa, and the failure mode was the failure of the concrete substrate 400 itself, meaning that the concrete substrate 400 was torn apart while the anti-corrosion structure did not separate, and the adhesion of the anti-corrosion structure was significantly improved.

[0071] The above results show that the low-viscosity epoxy resin material in the first structural layer 100 can fully penetrate into the capillary pores of the surface of the concrete substrate 400. After curing, it forms a large number of micro-wedge structures, which makes the first structural layer 100 and the concrete substrate 400 form a strong physical bond. The failure mode changes from interface failure to concrete substrate 400 failure, indicating that the bonding force between the coating and the concrete substrate 400 has exceeded the tensile strength of the concrete substrate 400 itself.

[0072] Test (II): Comparative Test of Cracking Resistance Two groups of samples were prepared. The control group B1 had the following structure: first, a first structural layer 100 with a thickness S4 of 0.5 mm and composed of epoxy resin was coated; then, a pure polyurea elastomer layer with a total thickness of 1.0 mm without the buffer structure 210 was directly sprayed; finally, a third structural layer 300 with a thickness S3 of 0.4 mm and composed of fluorocarbon resin was coated. The control group B1 lacked the buffer structure 210. The experimental group B2 had the following structure: first, a first structural layer 100 with a thickness S4 of 0.5 mm and composed of epoxy resin was coated; then, a pure polyurea elastomer layer with a total thickness of 1.0 mm was directly sprayed. A first layer of polyurea elastomer material with a thickness of 0.5mm is applied, followed by a buffer structure 210 with a mesh size 2111 and a side length L1 of 4mm, made of glass fiber mesh. Then, a second layer of polyurea elastomer material with a thickness of 0.5mm is applied to form a second structural layer 200. Finally, a third structural layer 300 with a thickness S3 of 0.4mm and made of fluorocarbon resin material is applied. Experimental group B2 is the complete structure of the embodiment of the present invention. The concrete substrate 400 is a C30 concrete test block, with an artificial crack of 0.3mm width and 5mm depth pre-fabricated in the center of each test block.

[0073] Two sets of samples were placed in a temperature cycling test chamber for temperature cycling stress testing. The cycling conditions were: -20℃ for 4 hours, then heated to +60℃ for 4 hours, with a complete cycle of 10 hours. A total of 50 cycles were performed. After every 10 cycles, the samples were taken out for visual inspection and the time and morphology of coating cracks were recorded.

[0074] like Figure 6 As shown, the left side shows the state of control group B1 after 30 temperature cycles, and the right side shows the state of experimental group B2 after 50 temperature cycles. The test found that the skeletonless control group B1 developed fine cracks after 20 cycles, and after 30 cycles, the crack length reached 5mm and penetrated the 400mm crack in the concrete substrate. After 40 cycles, it was severely cracked and the edges peeled off. In contrast, the experimental group B2 with the buffer structure 210 remained intact after 50 cycles, and there were no visible cracks on the coating surface.

[0075] The above results show that although the purely elastic coating has a certain elongation capacity, when the cracks in the concrete substrate 400 repeatedly open and close, the stress will concentrate at the local weak points of the coating, leading to rapid cracking of the anti-corrosion structure. The buffer structure 210 disperses the local stress throughout the entire grid system. When the cracks in the concrete substrate 400 open, the fiber bundles near the crack bear tensile stress, but due to the continuity of the buffer structure 210 grid, the stress is quickly transferred to the surrounding area, avoiding single-point failure. At the same time, the second structural layer 200 covering the buffer structure 210 provides flexible buffering. This synergistic effect allows the anti-corrosion structure to remain intact under severe temperature cycling.

[0076] Experiment (3): Comparative Test of Corrosion Resistance Two groups of samples were prepared for comparison. The control group C1 had the following structure: first, a first structural layer 100 with a thickness S4 of 0.5 mm and composed of epoxy resin was coated; then, a first layer of polyurea elastomer material with a thickness of 0.5 mm was coated; a buffer structure 210 with a mesh size 2111 and a side length L1 of 4 mm and composed of glass fiber mesh was laid; finally, a second structural layer 200 with a thickness of 0.5 mm was coated; the control group C1 lacked a third structural layer 300. The experimental group C2 had the following structure: first, a first layer of polyurea elastomer material with a thickness S4 of 0.5 mm and composed of epoxy resin was coated; then, a first layer of polyurea elastomer material with a thickness of 0.5 mm was coated; then, a buffer structure 210 with a mesh size L1 of 4 mm and composed of glass fiber mesh was laid; finally, a second structural layer 200 with a thickness of 0.5 mm was coated. A structural layer 100 is formed, followed by a first layer of polyurea elastomer material with a thickness of 0.5 mm. A buffer structure 210 with a side length L1 of 4 mm and made of glass fiber mesh is laid. Then, a second layer of polyurea elastomer material with a thickness of 0.5 mm is applied to form a second structural layer 200. Finally, a third structural layer 300 with a thickness S3 of 0.4 mm and made of fluorocarbon resin material is applied. Experimental group C2 is the complete structure of the embodiment of the present invention. The concrete substrate 400 is a C30 concrete specimen (50×50×20 mm) with a surface sandblasted. The sample is tested after curing for 7 days.

[0077] Neutral salt spray tests were conducted according to GB / T 1771-2007 "Determination of Neutral Salt Spray Resistance of Paints and Varnishes". Two sets of samples were placed in a salt spray test chamber at a temperature controlled at 35±2℃. A 5% sodium chloride solution was continuously sprayed, with a spray settling rate of 1-2 mL / (80cm²·h). The test cycle was 720 hours (30 days). Samples were removed every 168 hours (7 days), rinsed thoroughly with clean water, and photographed to record the surface condition of the corrosion-resistant structure. The samples were then returned to the salt spray test chamber.

[0078] like Figure 7 As shown, the left side is the state of the control group C1 after 720 hours of salt spray test, and the right side is the state of the experimental group C2 after 720 hours of salt spray test. The test found that after 168 hours (7 days) of test, there were no significant changes in either the control group C1 or the experimental group C2. After 336 hours (14 days) of test, a small number of pinhead-sized bubbles appeared on the surface of the control group C1, while no bubbles appeared on the surface of the experimental group C2. After 720 hours (30 days) of test, a large number of bubbles appeared on the surface of the control group C1, while no visible bubbles appeared on the surface of the experimental group C2.

[0079] The above results demonstrate that the neutral salt spray test, by accelerating corrosion testing of the anti-corrosion structure under high salt spray conditions, realistically simulates the erosion process of the anti-corrosion structure in high chloride ion environments such as coastal saline-alkali land. In control group C1, lacking the third structural layer 300, chloride ions and moisture in the salt spray gradually penetrated through the micropores of the second structural layer 200. Simultaneously, the corrosive medium accumulated inside the anti-corrosion structure, leading to blistering on its surface. In experimental group C2, protected by the third structural layer 300, chloride ions and moisture had difficulty penetrating, providing excellent shielding and isolation. This fully demonstrates that the third structural layer 300 is the first crucial barrier against chloride ion erosion in the entire anti-corrosion structure.

[0080] Experiment (IV): Effect of different first structural layer thicknesses S4 on the adhesion of anti-corrosion structures To verify the effect of different thicknesses S4 (0.1mm~0.8mm) of the first structural layer 100 on the adhesion of the anti-corrosion structure, five groups of samples were prepared. Each group used the same basic structure: a second structural layer 200 composed of a 1.0mm thick polyurea elastomer (with a buffer structure 210 consisting of a 4mm side length mesh 2111 made of fiberglass mesh); and a third structural layer 300 composed of a 0.4mm thick fluorocarbon resin. The experiment involved changing only the thickness S4 of the first structural layer 100, setting the thickness S4 to 0.05mm (group D1), 0.1mm (group D2), 0.4mm (group D3), 0.8mm (group D4), and 1.0mm (group D5). All first structural layers 100 were made of epoxy resin, and the concrete substrate 400 was a C30 concrete block with a surface sandblasted to a roughness R. Z The samples were cured at 23±2℃ and 50% relative humidity for 7 days before being tested.

[0081] The pull-out adhesion of each group of samples was determined according to GB / T 5210-2006 "Paints and Varnishes - Pull-out Adhesion Test", and the failure mode was recorded. Each group of samples was then placed in the salt spray test chamber described in Test (III) for a 168-hour accelerated test. The presence of penetrating blistering at the bottom interface of the anti-corrosion structure was observed to evaluate the sealing effect of the first structural layer 100 on the 400mm capillary pores of the concrete substrate. The test results are shown in Table 1. Table 1. Test results of pull-out adhesion and interface sealing performance for different thicknesses S4 of the first structural layer.

[0082] The above test results show that when the thickness S4 of the first structural layer 100 is less than 0.1 mm, the epoxy resin coating is insufficient and cannot fully penetrate into the capillary pores of the concrete substrate 400 to form an effective micro-wedge structure. The pull-out adhesion is only 1.4 MPa, and the failure mode is interface failure. Moreover, after 168 hours of salt spray, a large number of penetrating bubbles appear at the interface. The anchoring and sealing effects of the first structural layer 100 cannot meet the requirements of anti-corrosion engineering. When the thickness S4 exceeds 0.8 mm, the thickness of the first structural layer 100 itself is too large, and the interlayer stress generated by curing shrinkage increases accordingly, resulting in failure mode. The failure of the concrete substrate 400 changed from bulk failure to interlayer failure, and the pull-out adhesion dropped to 2.9 MPa, indicating that the excessively thick first structural layer 100 became a weak interface in the anti-corrosion structure. However, when the thickness S4 was in the range of 0.1 mm to 0.8 mm, the first structural layer 100 could fully wet and anchor to the surface of the concrete substrate 400, with a pull-out adhesion of more than 2.6 MPa. The failure mode changed from bulk failure of the concrete substrate 400 or interfacial failure to bulk failure of the concrete substrate 400. After the salt spray test, there were no penetrating bubbles at the interface, and the adhesion and interfacial sealing performance were both optimal.

[0083] Experiment (5): The effect of the thickness S2 of the second structural layer on the mechanical properties of the anti-corrosion structure To verify the effect of different thicknesses S2 (0.3mm~1.2mm) of the second structural layer 200 on the mechanical properties of the anti-corrosion structure, five groups of samples were prepared. Each group used the same basic structure: a first structural layer 100 with a thickness S4 of 0.5mm made of epoxy resin; a buffer structure 210 with a mesh size 2111 and a side length L1 of 4mm made of fiberglass mesh; and a third structural layer 300 with a thickness S3 of 0.4mm made of fluorocarbon resin. The experiment involved changing only the thickness S2 of the second structural layer 200, setting the thickness S2 to 0.15mm (Group E1), 0.3mm (Group E2), 0.7mm (Group E3), 1.2mm (Group E4), and 1.5mm (Group E5). The concrete substrate 400 was a C30 concrete block with a surface sandblasted to a roughness R. Z The sample size was 50 μm, and each group of samples was tested after curing for 7 days.

[0084] The pull-out adhesion of each group of samples was determined according to GB / T 5210-2006 "Paints and Varnishes - Pull-out Adhesion Test"; at the same time, the number of cycles at which the first visible crack appeared for each group of samples was recorded according to the temperature cycling method described in Test (II); the test results are shown in Table 2: Table 2. Mechanical performance test results for different thicknesses S2 of the second structural layer.

[0085] The test results show that in group E1, the thickness S2 of the second structural layer 200 is insufficient to completely cover the buffer structure 210, resulting in partial exposure of the buffer structure 210 and severely limited stress buffering capacity. When the thickness S2 of the second structural layer 200 is less than 0.3 mm, the stress buffering capacity is insufficient, and the anti-corrosion structure cracks after 18 temperature cycles, with a pull-out adhesion of only 2.1 MPa, which does not meet engineering requirements. When the thickness S2 exceeds 1.2 mm, the excessively thick second structural layer 200 generates significant internal stress during curing shrinkage, leading to edge warping, a drop in pull-out adhesion to 2.5 MPa, and reduced temperature cycle durability. However, when the thickness S2 is in the range of 0.3 mm to 1.2 mm, the anti-corrosion structure exhibits both good adhesion and excellent stress buffering capacity, resulting in the best overall performance.

[0086] Experiment (VI): The Influence of Mesh Side Length L1 of Different Buffer Structures on the Crack Resistance of Corrosion-Resistant Structures To verify the effect of different buffer structure 210 mesh 2111 side length L1 range (2mm~5mm) on the crack resistance of the anti-corrosion structure, five groups of samples were prepared. Each group of samples used the same basic structure: a first structural layer 100 with a thickness S4 of 0.5mm and made of epoxy resin, a second structural layer 200 with a thickness S2 of 1.0mm made of polyurea elastomer, and a third structural layer 300 with a thickness S3 of 0.4mm and made of fluorocarbon resin. The experiment was conducted by changing only the side length L1 of the mesh 2111 of the buffer structure 210, setting the side length L1 of the mesh 2111 to 1mm (group F1), 2mm (group F2), 3.5mm (group F3), 5mm (group F4), and 7mm (group F5). The buffer structure 210 was made of glass fiber mesh, and the concrete substrate 400 was a C30 concrete block (100×100×20mm) with a sandblasted surface. Each group of samples was tested after curing for 7 days.

[0087] A through crack with a width of 0.3 mm was pre-fabricated on the surface of concrete substrate 400 to simulate the actual cracking condition of concrete substrate 400; the temperature cycling method described in Experiment (II) was used for testing, and the strain distribution on the surface of the anti-corrosion structure was monitored using the digital image correlation (DIC) method. The number of cycles when the first visible crack appeared in each group of samples was recorded; the test results are shown in Table 3: Table 3. Test results of crack resistance of buffer structure with different mesh side lengths L1.

[0088] The above test results show that when the side length L1 of the mesh 2111 is less than 2 mm, the density of the mesh 2111 is too high, resulting in an increase in the interface between the buffer structure 210 and the elastic material of the second structural layer 200, which is prone to interface delamination under cyclic stress. When the side length L1 of the mesh 2111 is greater than 5 mm, the spacing of the mesh 2111 is too large, and the local stress cannot be effectively dispersed, and visible cracks appear after 28 cycles. However, when the side length L1 of the mesh 2111 is in the range of 2 mm to 5 mm, the buffer structure 210 can evenly disperse the crack propagation stress throughout the entire buffer structure 210, and the anti-corrosion structure has the best crack resistance performance.

[0089] In summary, the embodiments of the present invention adopt a layered structural design, which effectively improves the adhesion of the anti-corrosion structure, enhances the toughness and crack resistance of the anti-corrosion structure, and significantly extends the service life of the anti-corrosion structure. At the same time, by changing the thickness of the first structural layer 100 and the second structural layer 200 and the side length of the mesh 2111, it can be flexibly applied to different working conditions, effectively improving the applicability of the anti-corrosion structure.

[0090] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A concrete corrosion-resistant structure, characterized in that, include: A first structural layer, a second structural layer, and a third structural layer are stacked sequentially. The surface of the first structural layer is used to absorb stress. The second structural layer is used to block chloride ions and moisture penetration. The second structural layer is provided with a buffer structure, which is embedded within the second structural layer.

2. The concrete anti-corrosion structure according to claim 1, characterized in that, The buffer structure has multiple mesh openings, which are arranged regularly along a first direction and a second direction to form a three-dimensional mesh structure.

3. A concrete anti-corrosion structure according to claim 2, characterized in that, The mesh is square, and the side length L1 of the mesh ranges from 2mm to 5mm.

4. A concrete anti-corrosion structure according to claim 3, characterized in that, The buffer structure includes multiple separated buffer modules, which are equidistant from each other, and the spacing L2 between two adjacent buffer modules ranges from 20mm to 30mm.

5. A concrete anti-corrosion structure according to claim 4, characterized in that, The buffer module is a square module, and the side length L3 of the buffer module ranges from 500mm to 800mm.

6. A concrete anti-corrosion structure according to claim 5, characterized in that, Along the third direction, the thickness S1 of the buffer structure ranges from 100μm to 250μm; the buffer structure is made of fiber material, which is glass fiber or basalt fiber.

7. A concrete anti-corrosion structure according to claim 1, characterized in that, Along the third direction, the thickness S2 of the second structural layer ranges from 0.3 mm to 1.2 mm; the second structural layer is made of polyurea elastomer material or polyurethane elastomer material.

8. A concrete anti-corrosion structure according to claim 1, characterized in that, Along the third direction, the thickness S3 of the third structural layer ranges from 0.3mm to 0.5mm, and the material of the third structural layer is fluorocarbon resin or polysiloxane resin.

9. A concrete anti-corrosion structure according to claim 1, characterized in that, The thickness S4 of the first structural layer ranges from 0.1 mm to 0.8 mm, and the material of the first structural layer is epoxy resin or silane-modified polymer.

10. A preparation method for preparing a concrete anti-corrosion structure as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Pretreatment: The surface of the concrete substrate is pretreated by sandblasting, grinding or high-pressure water jetting to remove surface laitance, oil and loose layer, ensuring that the surface of the concrete substrate is clean, rough and free of standing water; First structural layer coating: The prepared first structural layer material is evenly applied to the surface of the concrete substrate by roller coating, brush coating or spraying and then cured; The first step of the second structural layer coating process: The second structural layer is divided into a first step and a second step for coating. After the first structural layer is completely cured, the material of the first second structural layer is applied by spraying. Laying the buffer structure: Before the material of the first layer of the second structural layer has fully cured, the buffer structure is laid so that it is embedded in the material of the first layer of the second structural layer; The second process of coating the second structural layer: After the buffer structure is laid, the second layer of the material of the second structural layer is sprayed immediately, so that the buffer structure is completely wrapped by the material of the second structural layer without any exposed parts, and then the whole structure is cured. Coating of the third structural layer: After the second structural layer has fully cured, the third structural layer is applied by spraying or rolling and then cured.

11. The preparation method according to claim 10, characterized in that, The first structural layer comprises the following components: epoxy resin material or silane-modified polymer material: 60-80 parts by weight; curing agent: 15-25 parts by weight; penetration promoter: 3-8 parts by weight; coupling agent: 1-5 parts by weight.

12. The preparation method according to claim 11, characterized in that, The second structural layer comprises the following components: 100 parts by weight of polyurea elastomer or polyurethane elastomer; 5-15 parts by weight of nano-filler; 3-10 parts by weight of plasticizer; and 1-3 parts by weight of ultraviolet absorber.

13. The preparation method according to claim 12, characterized in that, The nanoscale filler is one or more of nano-silica, nano-calcium carbonate, and nano-alumina.

14. The preparation method according to claim 10, characterized in that, The third structural layer comprises the following components: 70-85 parts by weight of fluorocarbon resin material or polysiloxane resin material; 10-20 parts by weight of pigments and fillers. Additives: 2-8 parts by weight.

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