Treatment method for seepage prevention and impermeability improvement of concrete

Abstract

The present application relates to a concrete treatment technique, in particular to a treatment method for seepage prevention and impermeability improvement of concrete. The method comprises: cleaning the surface of concrete; preparing a lubricating solution, uniformly applying the lubricating solution to the cleaned surface of the concrete, and placing same into a ventilated environment for ventilation; and preparing an epoxy resin adhesive solution, applying the epoxy resin adhesive solution to the surface of the concrete which has been coated with the lubricating solution and subjected to ventilation, and leaving same to stand and cure until the epoxy resin adhesive solution solidifies, so as to form a dense epoxy resin adhesive layer. The treatment method for seepage prevention and impermeability improvement of concrete of the present application can effectively seal microcracks and holes in areas of the surface layer of concrete, isolate the surface layer of concrete from the outside environment, enhance a repair effect on the surface layer of concrete, improve the anti-seepage performance and impermeability of concrete, and is suitable for seepage prevention and water leak repair of concrete structures under various scenarios.

Description

Methods for concrete seepage prevention and anti-seepage treatment Technical Field

[0001] This application relates to the field of concrete treatment technology, and in particular to a method for concrete seepage prevention and anti-seepage treatment. Background Technology

[0002] Water leakage is a common problem in underground structures. In current underground structural engineering, inadequate or insufficient vibration during construction often leads to honeycomb and voids within the concrete, forming interconnected seepage channels and causing large-scale leakage. Furthermore, discontinuous construction joints in the structure can severely affect the concrete's impermeability, deteriorating the underground environment, reducing structural durability, and even endangering the safety of personnel, equipment, and vehicles. The causes of water leakage in underground structures are complex, and the treatment techniques are challenging, involving numerous procedures and high requirements, making it a consistently significant and difficult problem in operation and maintenance.

[0003] Conventional methods involve using waterproof membranes and coatings for seepage prevention. However, frequent rainy seasons can lead to ruptures in municipal pipelines, resulting in significant groundwater pressure. This pressure can cause the bond between the waterproof membrane and the concrete interface to fail, leading to detachment and loss of waterproofing and seepage prevention. While waterproof coatings can form a membrane on the building's exterior surface to prevent water penetration, they are not very effective at repairing discontinuous construction joints. Therefore, finding a coating material and technology that can solve both waterproofing and seepage prevention problems while effectively repairing cracks is undoubtedly a pressing issue.

[0004] In addition, patent application CN116102311A provides a surface-penetrating waterproof coating. This cement-based penetrating crystalline waterproof coating has very high requirements for the concrete surface, and the surface treatment is time-consuming and laborious, and the waterproofing ability is also unsatisfactory. Patent application CN115433505A provides a modified epoxy resin waterproof coating composition, modified epoxy resin waterproof coating and its preparation method and application. It focuses on bonding with waterproof membranes, ignores the bonding performance with concrete, and the construction is complicated and has many procedures. Patent application CN117264528A provides a single-component polyurethane waterproof coating and its preparation method and structure. Although the construction is efficient, the cost is high and the emission of volatile organic compounds (VOCs) is large. Summary of the Invention

[0005] In view of the problems existing in the background technology, this application provides a concrete seepage prevention and anti-seepage treatment method, which can effectively seal construction joints, micro-cracks and pores in the concrete surface area, isolate the concrete surface from the outside world, enhance the repair effect on the concrete surface, and improve the seepage prevention and anti-seepage properties of concrete.

[0006] According to one aspect of the present invention, a method for concrete seepage prevention and anti-seepage treatment is provided, comprising: cleaning the concrete surface; preparing a lubricating solution, uniformly applying the lubricating solution to the cleaned concrete surface, and placing it in a ventilated environment for ventilation; preparing an epoxy resin adhesive, applying the epoxy resin adhesive to the concrete surface after the lubricating solution has been applied and the surface has been ventilated, and allowing it to stand for curing until the epoxy resin adhesive has solidified to form a dense epoxy resin adhesive layer.

[0007] In some embodiments of the present invention, the lubricating solution comprises an acetone solution and an epoxy resin A solution.

[0008] In some embodiments of the present invention, the acetone solution accounts for 40-60% by volume percentage, and the epoxy resin A adhesive accounts for 60-40%.

[0009] In some embodiments of the present invention, the acetone solution contains, by mass fraction, acetone ≥ 99.5%, methanol ≤ 0.05%, ethanol ≤ 0.05%, and water ≤ 0.3%, and the boiling point of the acetone solution is 56 ± 1 °C.

[0010] In some embodiments of the present invention, the lubricating solution is applied evenly to the concrete surface two or more times.

[0011] In some embodiments of the present invention, the epoxy resin adhesive comprises epoxy resin A and curing agent B.

[0012] In some embodiments of the present invention, the epoxy resin adhesive comprises, by weight, 18-22 parts of epoxy resin A and 8-12 parts of curing agent B.

[0013] In some embodiments of the present invention, the density of the epoxy resin adhesive layer is 1.05–1.30 g / cm³. 3 Tensile strength ≥30MPa, elastic modulus ≥1500MPa, elongation ≥1.5%, flexural strength ≥40MPa, compressive strength ≥70MPa.

[0014] In some embodiments of the present invention, the cleaning of the concrete surface includes: firstly, using a blower to clean the floating dust and debris from the concrete surface; then, using a brush to apply anhydrous ethanol to the concrete surface and letting it stand for the anhydrous ethanol to evaporate.

[0015] In some embodiments of the present invention, the anhydrous ethanol contains, by mass fraction, ethanol ≥ 99.7%, methanol ≤ 0.05%, isopropanol ≤ 0.01%, and water ≤ 0.3%.

[0016] Compared with the prior art, the present invention achieves the following technical effects:

[0017] 1. The concrete seepage prevention and anti-seepage treatment method of the present invention has good seepage prevention and anti-seepage effects, realizes effective leakage plugging and waterproofing in underground structure engineering, improves the seepage resistance of underground structures, ensures the durability of underground structures, prevents the deterioration of the internal environment of underground buildings, and ensures the smooth operation of underground buildings.

[0018] 2. The treatment method of the present invention is convenient to construct, has few steps, can be constructed on a large area, and is easy to apply in construction.

[0019] 3. The processing method of the present invention results in minimal change in concrete thickness, and has no impact on its self-weight or design scheme.

[0020] 4. The treatment method of the present invention allows the epoxy resin adhesive layer to penetrate into the pores of the concrete after surface curing, giving the concrete better durability and adaptability to complex environments, and providing excellent long-term waterproofing capabilities.

[0021] 5. The treatment method of the present invention optimizes the interfacial bonding between the resin and concrete. The epoxy resin adhesive layer can change with the creep of the concrete without the appearance of a large number of micro-cracks, thus further enhancing its long-term waterproofing ability. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 is a process diagram of the concrete seepage prevention and anti-seepage treatment method of the present invention;

[0024] Figure 2 is a magnified schematic diagram of a portion of the concrete surface that needs to be treated;

[0025] Figure 3 is a magnified schematic diagram of a portion of the surface after cleaning to remove floating dust and debris;

[0026] Figure 4 is a magnified schematic diagram of a portion of the surface after the surface treatment with lubricating solution has been applied and the acetone has completely evaporated.

[0027] Figure 5 is a magnified schematic diagram of a portion of the surface after the epoxy resin adhesive has been applied and cured.

[0028] Figure 6 is a flowchart of the concrete seepage prevention and anti-seepage treatment method of the present invention.

[0029] The labels in the attached diagram represent the following: 1. Hole; 2. Microcrack; 3. Construction joint; 4. Floating dust and debris; 5. Epoxy resin A liquid; 6. Epoxy resin adhesive layer. Detailed Implementation

[0030] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0031] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0032] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0033] The concrete seepage prevention and anti-seepage treatment method provided in the embodiments of this application is described below with reference to the accompanying drawings.

[0034] This application discloses a method for concrete seepage prevention and anti-seepage treatment. As shown in Figure 2, the concrete has defects such as holes 1, microcracks 2, and construction joints 3, and the holes 1, microcracks 2, and construction joints 3 contain floating dust and debris 4.

[0035] As shown in Figure 1, the concrete seepage prevention and anti-seepage treatment method includes the following steps:

[0036] First, clean the concrete surface.

[0037] Then prepare a lubricating solution, apply it evenly to the cleaned concrete surface, and place it in a well-ventilated environment.

[0038] Next, prepare the epoxy resin adhesive, apply the epoxy resin adhesive to the concrete surface after the lubricating solution has been applied and the surface has been ventilated, and let it stand to cure until the epoxy resin adhesive is cured, forming a dense epoxy resin adhesive layer.

[0039] By using the concrete seepage prevention and anti-seepage treatment method in this technical solution, and by improving the resin diffusion effect, a lubricating solution is used to pretreat the concrete surface, and then epoxy resin is applied to allow it to better diffuse into the cracks and pores inside the concrete, such as pores 1, micro-cracks 2, and construction joints 3. After the epoxy resin has cured, a dense and waterproof epoxy resin layer will be formed on the concrete surface, which can isolate the concrete surface from the outside world and effectively fill the micro-cracks and pores in the concrete surface area, thereby improving the impermeability of the concrete and solving the problem of water leakage in existing underground structures.

[0040] In some embodiments of the present invention, cleaning the concrete surface includes the following steps:

[0041] First, use a blower to clean the loose dust and debris from the concrete surface, as shown in Figure 3.

[0042] Next, use a brush to apply anhydrous ethanol to the concrete surface and let it stand for the anhydrous ethanol to evaporate, thereby further cleaning the concrete surface.

[0043] Furthermore, in anhydrous ethanol, by mass fraction, ethanol ≥ 99.7%, methanol ≤ 0.05%, isopropanol ≤ 0.01%, and water ≤ 0.3%.

[0044] Furthermore, the fan may include, but is not limited to, an electric sprayer, blower, air blower, or suction fan, as long as it can remove floating dust, debris, and other impurities from the concrete surface; no specific limitation is imposed here.

[0045] In some embodiments of the present invention, the lubricating solution comprises acetone and epoxy resin A.

[0046] When epoxy resin A is mixed with acetone solution, a lubricating solution is formed, which can easily penetrate into the surface of various materials, especially concrete. This can enhance the affinity between epoxy resin and concrete and improve its repair effect on material surfaces.

[0047] Furthermore, in the lubricating solution, by volume percentage, acetone solution accounts for 40-60%, and epoxy resin A solution accounts for 60-40%.

[0048] Specifically, in the acetone solution of this embodiment, by mass fraction, acetone ≥ 99.5%, methanol ≤ 0.05%, ethanol ≤ 0.05%, water ≤ 0.3%, and the boiling point of the acetone solution is 56±1℃.

[0049] Specifically, in this embodiment, the epoxy resin A liquid is white or slightly yellow, and its components, by weight fraction, include: 50-70 parts of bisphenol A type epoxy resin, 30-50 parts of bisphenol F type epoxy resin, 1-15 parts of alkylphenol polyoxyethylene ether, 3-4 parts of o-tolyl glycidyl ether, 6-10 parts of propylene oxide phenyl ether, 8-10 parts of liquid polysulfide rubber toughening agent, 5-8 parts of carboxyl-terminated liquid nitrile rubber toughening agent, and 35-40 parts of active silica powder.

[0050] Furthermore, the lubricating solution is applied evenly and in equal amounts to the concrete surface, and the lubricating solution is applied to the concrete surface more than twice to completely wet the cracks, pores, construction joints, etc. on the concrete surface.

[0051] Furthermore, after the lubricating solution is evenly applied to the concrete surface, it is placed in a ventilated environment for at least half an hour to allow the acetone to completely evaporate, leaving epoxy resin A liquid 5, as shown in Figure 4.

[0052] In some embodiments of the present invention, the epoxy resin adhesive comprises epoxy resin A and curing agent B.

[0053] Furthermore, in the epoxy resin adhesive, by weight, there are 18-22 parts of epoxy resin A and 8-12 parts of curing agent B.

[0054] Specifically, in this embodiment, the epoxy resin A liquid is white or slightly yellow, and its components, by weight fraction, include: 50-70 parts of bisphenol A type epoxy resin, 30-50 parts of bisphenol F type epoxy resin, 1-15 parts of alkylphenol polyoxyethylene ether, 3-4 parts of o-tolyl glycidyl ether, 6-10 parts of propylene oxide phenyl ether, 8-10 parts of liquid polysulfide rubber toughening agent, 5-8 parts of carboxyl-terminated liquid nitrile rubber toughening agent, and 35-40 parts of active silica powder.

[0055] Curing agent B is brown or light brown, and its components, by weight fraction, include: 5-25 parts of polyetheramine curing agent, 50-70 parts of polyamide curing agent, 15-30 parts of diethyltoluene diamine, 3-3.5 parts of DMP-30 tertiary amine accelerator, 1-15 parts of alkylphenol polyoxyethylene ether, 3-4 parts of KH-550 aminopropyltriethoxysilane, 20-25 parts of activated silica powder, and 16-20 parts of activated calcium carbonate.

[0056] Furthermore, when applying epoxy resin to the concrete surface, it is necessary to ensure that the epoxy resin completely fills the pores, cracks and construction joints, as shown in Figure 5.

[0057] In some embodiments of the present invention, after the epoxy resin adhesive has cured, the density of the resulting epoxy resin layer is 1.05–1.30 g / cm³. 3The tensile strength is ≥30MPa, the elastic modulus is ≥1500MPa, the elongation is ≥1.5%, the flexural strength is ≥40MPa and it does not exhibit brittle failure, and the compressive strength is ≥70MPa. It meets the technical requirements of the "Code for Design of Strengthening Concrete Structures" GB50367-2011 standard. The epoxy resin adhesive layer has good anti-seepage and waterproof effects, wear resistance, and weather resistance.

[0058] In some embodiments of the present invention, when preparing a lubricating solution or epoxy resin adhesive, it can be mixed evenly by mechanical stirring.

[0059] Furthermore, the lubricating solution can be stirred for about 2 minutes at a maximum speed of 600 rpm, while the epoxy resin adhesive needs to be stirred thoroughly for about 10 minutes.

[0060] Specifically, the lubricating solution in this embodiment needs to be stirred into a colorless and transparent liquid before it can be used.

[0061] In some embodiments of the present invention, when applying anhydrous ethanol, lubricating solution or epoxy resin adhesive, brushes, scrapers or other application tools can be used to achieve uniform application and ensure that special parts such as cracks, holes and construction joints of the concrete structure are completely filled. In addition, anhydrous ethanol can also be sprayed onto the concrete surface by an electric spray bottle.

[0062] The concrete seepage prevention and anti-seepage treatment method of this application will be further described below with reference to specific embodiments.

[0063] Example 1

[0064] The test specimens were C30P8 standard impermeability specimens (concrete strength grade is C30, impermeability grade is P8). These specimens met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard. They were treated 7 days before the curing time. The concrete impermeability and waterproofing treatment methods are shown in Figure 6 and include the following steps:

[0065] S1: Surface cleaning.

[0066] Since there is some dust and debris on the surface of the specimen, as shown in Figure 2, it is necessary to use an electric sprayer or other equipment to blow air and clean the concrete surface to be treated; then use an electric sprayer to apply anhydrous ethanol with a mass fraction of ≥99.7% to the surface to be treated, at least twice, and let it stand until it evaporates completely, as shown in Figure 3.

[0067] Anhydrous ethanol, with an ethanol mass fraction ≥99.7%, methanol ≤0.05%, isopropanol ≤0.01%, and water content ≤0.3%.

[0068] S2: Prepare lubricating solution.

[0069] A lubricating solution is prepared by mixing 40% by volume of epoxy resin A and 60% by volume of acetone solution. It needs to be stirred thoroughly to form a colorless and transparent liquid. The epoxy resin A must be completely dissolved before it can be used. At the same time, this solution is highly volatile and should be used as soon as possible after preparation.

[0070] Acetone solution, acetone content ≥99.5%, boiling point 56±1℃, methanol ≤0.05%, ethanol ≤0.05%, water ≤0.3%. Epoxy resin A liquid, white or slightly yellow, composed of the following components by weight fraction: 60 parts bisphenol A type epoxy resin, 40 parts bisphenol F type epoxy resin, 8 parts alkylphenol polyoxyethylene ether, 3 parts o-tolyl glycidyl ether, 8 parts propylene oxide phenyl ether, 9 parts liquid polysulfide rubber toughening agent, 6 parts carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts activated silica powder.

[0071] S3: Surface treatment.

[0072] Apply the mixed lubricating solution evenly to the surface of the concrete impermeability test specimen using a brush, applying at least two coats, paying special attention to areas with pores. Then place the specimen in a ventilated environment for at least half an hour, allowing the acetone to completely evaporate before proceeding to the next step, as shown in Figure 4.

[0073] S4: Surface curing.

[0074] An epoxy resin adhesive is prepared by mixing 20 parts by weight of epoxy resin A and 10 parts by weight of curing agent B. The mixture needs to be stirred thoroughly for about 10 minutes, then applied to the surface of the concrete impermeable specimen, ensuring that the pores and cracks are completely filled. It is then left to cure until it is cured, forming a cured epoxy resin adhesive layer, as shown in Figure 5.

[0075] Epoxy resin A is white or slightly yellow. Its components, by weight fraction, include: 60 parts of bisphenol A type epoxy resin, 40 parts of bisphenol F type epoxy resin, 8 parts of alkylphenol polyoxyethylene ether, 3 parts of o-tolyl glycidyl ether, 8 parts of propylene oxide phenyl ether, 9 parts of liquid polysulfide rubber toughening agent, 6 parts of carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts of active silica powder.

[0076] The curing agent B is brown or light brown, and its components, by weight fraction, include: 15 parts of polyetheramine curing agent, 60 parts of polyamide curing agent, 23 parts of diethyltoluenediamine, 3 parts of DMP-30 tertiary amine accelerator, 7 parts of alkylphenol polyoxyethylene ether, 3 parts of KH-550 aminopropyltriethoxysilane, 22 parts of active silica powder, and 18 parts of active calcium carbonate.

[0077] The density of the cured epoxy resin adhesive layer described above is approximately 1.05–1.30 g / cm³. 3The tensile strength is ≥30MPa, the elastic modulus is ≥1500MPa, the elongation is ≥1.5%, the flexural strength is ≥40MPa and does not exhibit brittle failure, and the compressive strength is ≥70MPa, meeting the technical requirements of the "Code for Design of Strengthening Concrete Structures" GB50367-2011.

[0078] Example 2

[0079] The test specimens were C30P8 standard impermeability specimens (concrete strength grade is C30, impermeability grade is P8). These specimens met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard. They were treated 7 days before the curing time. The concrete impermeability and waterproofing treatment methods included the following steps:

[0080] S1: Surface cleaning.

[0081] Since there is some dust and debris on the surface of the specimen, it is necessary to use an electric sprayer or other equipment to blow air and clean the concrete surface to be treated; then use an electric sprayer to apply anhydrous ethanol with a mass fraction of ≥99.7% to the surface to be treated, at least twice, and let it stand until it evaporates completely.

[0082] Anhydrous ethanol, with an ethanol mass fraction ≥99.7%, methanol ≤0.05%, isopropanol ≤0.01%, and water content ≤0.3%.

[0083] S2: Prepare lubricating solution.

[0084] A lubricating solution is prepared by mixing 50% by volume epoxy resin A and 50% by volume acetone solution. It needs to be stirred thoroughly to form a colorless and transparent liquid. The epoxy resin A must be completely dissolved before it can be used. At the same time, this solution is highly volatile and should be used as soon as possible after preparation.

[0085] Acetone solution, acetone content ≥99.5%, boiling point 56±1℃, methanol ≤0.05%, ethanol ≤0.05%, water ≤0.3%. Epoxy resin A liquid, white or slightly yellow, composed of the following components by weight fraction: 60 parts bisphenol A type epoxy resin, 40 parts bisphenol F type epoxy resin, 8 parts alkylphenol polyoxyethylene ether, 3 parts o-tolyl glycidyl ether, 8 parts propylene oxide phenyl ether, 9 parts liquid polysulfide rubber toughening agent, 6 parts carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts activated silica powder.

[0086] S3: Surface treatment.

[0087] Apply the mixed lubricating solution evenly to the surface of the concrete impermeability test specimen using a brush, applying at least two coats, paying special attention to areas with pores. Then place the specimen in a well-ventilated environment for at least half an hour, allowing the acetone to evaporate completely before proceeding to the next step.

[0088] S4: Surface curing.

[0089] The epoxy resin liquid is prepared by mixing 20 parts by weight of epoxy resin A liquid and 10 parts by weight of curing agent B liquid. It needs to be stirred thoroughly for about 10 minutes, applied to the surface of the concrete impermeable specimen, and ensured that the pores and cracks are completely filled. It is then left to cure until it is cured, forming a cured epoxy resin adhesive layer.

[0090] Epoxy resin A is white or slightly yellow. Its components, by weight fraction, include: 60 parts of bisphenol A type epoxy resin, 40 parts of bisphenol F type epoxy resin, 8 parts of alkylphenol polyoxyethylene ether, 3 parts of o-tolyl glycidyl ether, 8 parts of propylene oxide phenyl ether, 9 parts of liquid polysulfide rubber toughening agent, 6 parts of carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts of active silica powder.

[0091] The curing agent B is brown or light brown, and its components, by weight fraction, include: 15 parts of polyetheramine curing agent, 60 parts of polyamide curing agent, 23 parts of diethyltoluenediamine, 3 parts of DMP-30 tertiary amine accelerator, 7 parts of alkylphenol polyoxyethylene ether, 3 parts of KH-550 aminopropyltriethoxysilane, 22 parts of active silica powder, and 18 parts of active calcium carbonate.

[0092] The density of the cured epoxy resin adhesive layer described above is approximately 1.05–1.30 g / cm³. 3 The tensile strength is ≥30MPa, the elastic modulus is ≥1500MPa, the elongation is ≥1.5%, the flexural strength is ≥40MPa and does not exhibit brittle failure, and the compressive strength is ≥70MPa, meeting the technical requirements of the "Code for Design of Strengthening Concrete Structures" GB50367-2011.

[0093] Example 3

[0094] The test specimens were C30P8 standard impermeability specimens (concrete strength grade is C30, impermeability grade is P8). These specimens met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard. They were treated 7 days before the curing time. The concrete impermeability and waterproofing treatment methods included the following steps:

[0095] S1: Surface cleaning.

[0096] Since there is some dust and debris on the surface of the specimen, it is necessary to use an electric sprayer or other equipment to blow air and clean the concrete surface to be treated; then use an electric sprayer to apply anhydrous ethanol with a mass fraction of ≥99.7% to the surface to be treated, at least twice, and let it stand until it evaporates completely.

[0097] Anhydrous ethanol, with an ethanol mass fraction ≥99.7%, methanol ≤0.05%, isopropanol ≤0.01%, and water content ≤0.3%.

[0098] S2: Prepare lubricating solution.

[0099] A lubricating solution is prepared by mixing 60% by volume epoxy resin A and 40% by volume acetone solution. It needs to be stirred thoroughly to form a colorless and transparent liquid. The epoxy resin A must be completely dissolved before it can be used. At the same time, this solution is highly volatile and should be used as soon as possible after preparation.

[0100] Acetone solution, acetone content ≥99.5%, boiling point 56±1℃, methanol ≤0.05%, ethanol ≤0.05%, water ≤0.3%. Epoxy resin A liquid, white or slightly yellow, composed of the following components by weight fraction: 60 parts bisphenol A type epoxy resin, 40 parts bisphenol F type epoxy resin, 8 parts alkylphenol polyoxyethylene ether, 3 parts o-tolyl glycidyl ether, 8 parts propylene oxide phenyl ether, 9 parts liquid polysulfide rubber toughening agent, 6 parts carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts activated silica powder.

[0101] S3: Surface treatment.

[0102] Apply the mixed lubricating solution evenly to the surface of the concrete impermeability test specimen using a brush, applying at least two coats, paying special attention to areas with pores. Then place the specimen in a well-ventilated environment for at least half an hour, allowing the acetone to evaporate completely before proceeding to the next step.

[0103] S4: Surface curing.

[0104] The epoxy resin liquid is prepared by mixing 20 parts by weight of epoxy resin A liquid and 10 parts by weight of curing agent B liquid. It needs to be stirred thoroughly for about 10 minutes, applied to the surface of the concrete impermeable specimen, and ensured that the pores and cracks are completely filled. It is then left to cure until it is cured, forming a cured epoxy resin adhesive layer.

[0105] Epoxy resin A is white or slightly yellow. Its components, by weight fraction, include: 60 parts of bisphenol A type epoxy resin, 40 parts of bisphenol F type epoxy resin, 8 parts of alkylphenol polyoxyethylene ether, 3 parts of o-tolyl glycidyl ether, 8 parts of propylene oxide phenyl ether, 9 parts of liquid polysulfide rubber toughening agent, 6 parts of carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts of active silica powder.

[0106] The curing agent B is brown or light brown, and its components, by weight fraction, include: 15 parts of polyetheramine curing agent, 60 parts of polyamide curing agent, 23 parts of diethyltoluenediamine, 3 parts of DMP-30 tertiary amine accelerator, 7 parts of alkylphenol polyoxyethylene ether, 3 parts of KH-550 aminopropyltriethoxysilane, 22 parts of active silica powder, and 18 parts of active calcium carbonate.

[0107] The density of the cured epoxy resin adhesive layer described above is approximately 1.05–1.30 g / cm³. 3 The tensile strength is ≥30MPa, the elastic modulus is ≥1500MPa, the elongation is ≥1.5%, the flexural strength is ≥40MPa and does not exhibit brittle failure, and the compressive strength is ≥70MPa, meeting the technical requirements of the "Code for Design of Strengthening Concrete Structures" GB50367-2011.

[0108] Comparative Example 1

[0109] The test specimens were C30P8 standard impermeability specimens, which met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard.

[0110] Comparative Example 2

[0111] The test specimens were C30P8 standard impermeability specimens, which met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard. Epoxy resin treatment was performed 7 days before the curing time, including the following steps:

[0112] Step 1:

[0113] Surface cleaning: Use an electric sprayer or similar equipment to blow air and clean the concrete surface to be treated; then use a brush to apply anhydrous ethanol with a mass fraction of ≥99.7% to the treated surface, applying at least two coats, and let it stand until it evaporates completely.

[0114] Step 2:

[0115] Surface curing involves mixing 20 parts by weight of epoxy resin A and 10 parts by weight of curing agent B to form an epoxy resin adhesive. This adhesive needs to be thoroughly stirred for about 10 minutes before being applied to the surface of the concrete impermeable specimen. Ensure that the pores and cracks are completely filled and allow it to cure until it is cured, forming a cured epoxy resin.

[0116] The anhydrous ethanol mentioned above has an ethanol mass fraction ≥99.7%, methanol ≤0.05%, isopropanol ≤0.01%, and water content ≤0.3%.

[0117] Epoxy resin A is white or slightly yellow. Its components, by weight fraction, include: 60 parts of bisphenol A type epoxy resin, 40 parts of bisphenol F type epoxy resin, 8 parts of alkylphenol polyoxyethylene ether, 3 parts of o-tolyl glycidyl ether, 8 parts of propylene oxide phenyl ether, 9 parts of liquid polysulfide rubber toughening agent, 6 parts of carboxyl-terminated liquid nitrile rubber toughening agent, and 37 parts of active silica powder.

[0118] The curing agent B is brown or light brown, and its components, by weight fraction, include: 15 parts of polyetheramine curing agent, 60 parts of polyamide curing agent, 23 parts of diethyltoluenediamine, 3 parts of DMP-30 tertiary amine accelerator, 7 parts of alkylphenol polyoxyethylene ether, 3 parts of KH-550 aminopropyltriethoxysilane, 22 parts of active silica powder, and 18 parts of active calcium carbonate.

[0119] The aforementioned cured epoxy resin has a density of approximately 1.05–1.30 g / cm³. 3 The tensile strength is ≥30MPa, the elastic modulus is ≥1500MPa, the elongation is ≥1.5%, the flexural strength is ≥40MPa and it shall not be brittle. The compressive strength is ≥70MPa, which meets the technical requirements of the "Code for Design of Strengthening Concrete Structures" GB50367-2011.

[0120] Comparative Example 3

[0121] Oriental Rainbow Cement-Based Penetrating Crystallizing Waterproof Coating (PCC-501), wherein the coating powder and water are mixed at a mass ratio of 1:0.35.

[0122] The test specimens were C30P8 standard impermeability specimens, which met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard.

[0123] Comparative Example 4

[0124] Patent application CN117264528A discloses a single-component polyurethane waterproof coating, comprising the following raw materials in parts by weight: DL-2000D, 100 parts by weight; EP330N, 55 parts by weight; SOLTER T-920A, 16 parts by weight; trioctyl phosphate, 124 parts by weight; butyl acetate, 18 parts by weight; talc, 70 parts by weight; heavy calcium carbonate, 135 parts by weight; toluene diisocyanate, 36 parts by weight; end-capping agent A, 12 parts by weight; defoamer, 1.8 parts by weight; dispersant, 0.3 parts by weight; and stannous octoate, 0.6 parts by weight. It is prepared according to the patent requirements.

[0125] The test specimens were C30P8 standard impermeability specimens, which met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard.

[0126] Comparative Example 5

[0127] Patent application CN115433505A discloses a modified epoxy resin waterproof coating composition, a modified epoxy resin waterproof coating, its preparation method, and its application. 100 parts by weight of modified bisphenol A type epoxy resin T1 are mixed with 8 parts by weight of polypropylene glycol diglycidyl ether and 0.8 parts by weight of defoamer for 30 minutes to obtain an epoxy adhesive; then 24 parts by weight of cashew phenol type epoxy curing agent are mixed for 5 minutes.

[0128] The test specimens were C30P8 standard impermeability specimens, which met the requirements of the national standard GB50164-2011 Concrete Quality Control Standard.

[0129] The permeability grade of the specimens described in Examples 1-3 and Comparative Examples 1-5 was tested after 28 days of standard curing.

[0130] Table 1. Test results of impermeability grade of concrete using different seepage prevention treatments and untreated concrete.

[0131] The test results show that the seepage prevention treatment method described in this invention has significantly improved the seepage prevention performance.

[0132] In summary, the aforementioned seepage prevention treatment method for improving resin diffusion has excellent seepage and waterproofing effects, good weather resistance, and good wear resistance, and can maintain long-term waterproofing capabilities in complex environments. This invention not only eliminates leakage caused by seepage channels in concrete, but also seals and waterproofs discontinuous construction joints. Pretreatment enhances the affinity between concrete and epoxy resin, improving the diffusion effect and allowing the epoxy resin to better penetrate into the concrete, thereby improving the concrete's seepage resistance while reinforcing cracks. The application method is convenient; the epoxy resin adhesive layer changes with concrete creep without developing numerous micro-cracks, demonstrating excellent long-term working potential.

[0133] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for concrete seepage prevention and anti-seepage treatment, characterized in that, include: Clean the concrete surface; Prepare a lubricating solution, apply it evenly to the cleaned concrete surface, and place it in a well-ventilated environment. Prepare the epoxy resin adhesive, apply the epoxy resin adhesive to the concrete surface after the lubricating solution has been applied and the surface has been ventilated, and let it stand to cure until the epoxy resin adhesive is cured to form a dense epoxy resin adhesive layer.

2. The method for concrete seepage prevention and anti-seepage treatment according to claim 1, characterized in that, The lubricating solution comprises acetone solution and epoxy resin A solution.

3. The method for concrete seepage prevention and anti-seepage treatment according to claim 2, characterized in that, In the lubricating solution, by volume percentage, the acetone solution accounts for 40-60%, and the epoxy resin A adhesive accounts for 60-40%.

4. The concrete seepage prevention and anti-seepage treatment method according to claim 3, characterized in that, The acetone solution contains, by mass fraction, acetone ≥ 99.5%, methanol ≤ 0.05%, ethanol ≤ 0.05%, and water ≤ 0.3%, and the boiling point of the acetone solution is 56 ± 1 °C.

5. The method for concrete seepage prevention and anti-seepage treatment according to claim 1, characterized in that, The lubricating solution is applied evenly to the concrete surface at least twice.

6. The method for concrete seepage prevention and anti-seepage treatment according to claim 1, characterized in that, The epoxy resin adhesive comprises epoxy resin A and curing agent B.

7. The concrete seepage prevention and anti-seepage treatment method according to claim 6, characterized in that, In the epoxy resin adhesive, by weight, there are 18-22 parts of epoxy resin A and 8-12 parts of curing agent B.

8. The method for concrete seepage prevention and anti-seepage treatment according to claim 7, characterized in that, The epoxy resin adhesive layer has a density of 1.05–1.30 g / cm³. 3 Tensile strength ≥30MPa, elastic modulus ≥1500MPa, elongation ≥1.5%, flexural strength ≥40MPa, compressive strength ≥70MPa.

9. The method for concrete seepage prevention and anti-seepage treatment according to claim 1, characterized in that, The cleaning of the concrete surface includes: First, use a blower to clean the loose dust and debris from the concrete surface; Then use a brush to apply anhydrous ethanol to the concrete surface and let it stand until the anhydrous ethanol evaporates.

10. The method for concrete seepage prevention and anti-seepage treatment according to claim 9, characterized in that, The anhydrous ethanol contains, by mass fraction, ethanol ≥ 99.7%, methanol ≤ 0.05%, isopropanol ≤ 0.01%, and water ≤ 0.3%.

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