Industrial factory building cement floor crack repairing construction method

Abstract

The invention relates to a construction method for repairing cracking of a cement floor of an industrial factory building. The construction method comprises the steps of base surface pretreatment, cement mortar laying, three-dimensional elastomer grid implanting, anti-cracking mortar laying, nano adsorption layer hot-pressing compounding, post-treatment maintenance and the like. Wherein the surface and the two sides of the V-shaped groove are coated with the cement mortar and the interface agent within the range of 0.5 m, the three-dimensional elastomer grid is implanted, the anti-cracking mortar is laid, the nanometer adsorption layer is subjected to hot pressing when the hardness of the cement mortar reaches 70%, and finally post-treatment maintenance is conducted, so that the structural strength and durability of the box girder are effectively enhanced. The method is mainly used for repairing and reinforcing the cement floor, and the crack resistance and the service life of the cement floor can be remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of repairing cement floors in industrial plants. More specifically, this invention relates to a construction method for repairing cracks in cement floors in industrial plants. Background Technology

[0002] Industrial plant concrete floors, frequently subjected to high-load equipment pressure, are typically reinforced with steel bars. However, due to factors such as equipment loads, vehicle traffic, environmental erosion, and construction quality, their structural performance gradually declines. Common problems include surface sanding, cracking, and surface peeling. These issues not only affect the convenience of factory operations but, more importantly, reduce their load-bearing capacity and durability.

[0003] Traditional repair methods have several shortcomings. For example, while directly injecting ordinary mortar is simple, its overall repair effect on large-area or deep cracks is limited. Applying waterproof membranes or epoxy coatings improves surface protection, but its structural reinforcement of cracks is weak and requires high design and construction precision. Furthermore, traditional repair methods often neglect the importance of substrate pretreatment, leading to poor adhesion between the repair material and the substrate, and problems such as hollow areas and detachment.

[0004] In terms of material application, traditional grouting materials have certain limitations in their adhesion to cement floor surfaces. Due to the water absorption and roughness of the cement floor surface, the grouting adhesive may not be able to fully wet and adhere to the substrate, resulting in insufficient bond strength. Especially in humid environments, the adhesion performance of the grouting adhesive will further decline.

[0005] In summary, existing technologies for repairing cracked cement floors in industrial plants still have many shortcomings in terms of material performance, construction techniques, and overall repair effects. An effective repair method is needed to address these issues. Summary of the Invention

[0006] To achieve these objectives and other advantages according to the present invention, a preferred embodiment of the present invention provides a method for repairing cracks in cement floors of industrial plants, comprising the following steps: S1, Base surface pretreatment Pre-treat the surface of the cement floor crack in the industrial plant by chiseling away the loose concrete down to the bottom layer along the crack direction to form a V-shaped groove and then cleaning it. S2, Cement mortar laying Apply another layer of cement mortar to the surface of the V-groove and within a 0.5m range on both sides of the V-groove; after the cement mortar has hardened, apply interface agent B to the surface of the V-groove and within a 0.5m range on both sides of the V-groove. S3, 3D elastomer mesh implantation When the cement mortar reaches 70% hardness, a three-dimensional elastomer mesh made of thermoplastic elastomer is pressed and embedded into the cement mortar, and the three-dimensional elastomer mesh is partially embedded in the cement mortar. S4. Crack-resistant mortar laying A layer of crack-resistant mortar is applied to the surface of the V-groove and within 0.5m on both sides of the V-groove, and the three-dimensional elastomer mesh is embedded in the crack-resistant mortar. S5, nano-adsorption layer hot-pressed composite When the cement mortar reaches 70% hardness, a nano-adsorption material is evenly spread on its surface using a high-frequency hot press at a temperature of 120-140℃ to form a nano-adsorption layer. S6, Post-treatment and Maintenance After construction, spray a penetrating rust inhibitor and cover with a moisturizing film for 72 hours at 20±2℃.

[0007] The above construction method ensures good adhesion of subsequent materials through substrate pretreatment, and the use of cement mortar and interface agent further improves surface density and adhesion. The embedding of a three-dimensional elastomer mesh enhances overall crack resistance and toughness, while the crack-resistant mortar further improves crack resistance. The hot-pressing composite of the nano-adsorption layer can adsorb harmful substances and extend service life. The final post-treatment curing ensures construction quality and makes the overall reinforcement effect more durable and stable.

[0008] Preferably, the pretreatment of S1 includes the following operations: chiseling away loose concrete along the crack direction down to the bottom layer to form a V-shaped groove, the groove depth being 2-3 times the maximum width of the crack and the groove width being 3-4 times the width of the crack; rinsing the V-shaped groove and the area within 0.05m on both sides of the V-shaped groove with high-pressure water; filling the V-shaped groove with injection adhesive; applying a layer of injection adhesive within 0.5m on both sides of the V-shaped groove; and further applying a layer of interface agent A on the surface of the V-shaped groove and within 0.5m on both sides of the V-shaped groove.

[0009] The aforementioned pretreatment method, by forming a V-shaped groove and precisely controlling its depth and width, can thoroughly remove loose concrete around the crack, providing a better bonding base for subsequent reinforcement materials. High-pressure water flushing ensures the cleanliness of the groove and surrounding areas, while the filling and coating of the injection adhesive further enhances the compactness and adhesion of the crack. The use of interface agent A further improves the bonding effect between subsequent materials and the substrate, effectively solving the problems existing in traditional pretreatment methods and greatly improving the quality and effect of reinforcement construction.

[0010] Interface agent A and interface agent B are both emulsion-type interface agents. Interface agent A is mainly used for pretreatment of the substrate after crack treatment of cement floors in industrial plants. Its purpose is to enhance the bond between new and old concrete, ensuring that subsequent reinforcement materials can firmly adhere to the substrate. It has good permeability and adhesion properties, effectively improving the water absorption rate and bonding effect of the concrete surface. Interface agent B is used for surface treatment after cement mortar has hardened. Its main function is to further improve the bond strength between cement mortar and subsequent reinforcement materials (such as crack-resistant mortar, nano-adsorbent materials, etc.). Interface agent B typically has excellent film-forming and impermeability properties, forming a dense protective film on the cement mortar surface, enhancing the crack resistance and durability of the interface.

[0011] Preferably, step S3 further includes the following operation: a pre-compressed waterstop strip is inserted longitudinally at the grid nodes of the three-dimensional grid, and the compression rate of the waterstop strip is controlled at 30%-40% to ensure an interference fit with the cement mortar in the dry state.

[0012] The aforementioned technical solution inserts pre-compressed waterstop strips at the nodes of the three-dimensional elastomer mesh and strictly controls the compression rate of the waterstop strips to ensure an interference fit with the cement mortar in a dry state. This effectively prevents moisture penetration and improves the waterproof performance of the structure. This design, without affecting the crack resistance of the three-dimensional elastomer mesh, prevents internal corrosion caused by moisture penetration, thereby extending the service life of the cement floor and enhancing its durability in complex environments.

[0013] Preferably, the pore size of the nano-adsorption layer is gradient-distributed, with the surface pore size being 50-100 nm and the bottom pore size being 200-500 nm.

[0014] The above technical solution uses a nano-adsorption layer with a gradient pore size distribution. The surface pores are smaller, which can effectively adsorb fine harmful substances and prevent them from entering the structure. The bottom pores are larger, which is conducive to air permeability and diffusion of internal substances, avoiding problems such as internal pressure changes caused by poor air permeability due to excessively small pore size.

[0015] Preferably, the nano-adsorbent material is laid in stages under pressure at 120-140℃ using a high-frequency hot press: the initial pressure is 0.5MPa and held for 2 minutes, then increased to 1.2MPa and held for 5 minutes, and finally cooled and shaped at 0.8MPa.

[0016] The above technical solution employs a high-frequency hot press to apply pressure in stages to lay the nano-adsorbent material, while strictly controlling temperature and pressure parameters. This ensures a tight bond between the nano-adsorbent material and the cement mortar, forming a strong overall structure. The staged pressurization method allows the nano-adsorbent material to fully adapt to the surface condition of the cement mortar at different stages, avoiding material damage or deformation caused by excessive pressure applied at once.

[0017] Preferably, the porous nano-adsorption layer is filled with sulfonated polystyrene loaded with lanthanum zirconate titanate, and its chloride ion exchange capacity is ≥1.8 mmol / g.

[0018] The above-mentioned technical solution uses sulfonated polystyrene loaded with lanthanum zirconate titanate, which has a high chloride ion exchange capacity and can efficiently adsorb harmful ions such as chloride ions, effectively preventing chloride ions from corroding the steel bars inside the ground.

[0019] Preferably, after step S6, the following step is also included: an embedded stress buffer strip is provided at the edge of the V-groove within a range of 0.5m on both sides, the buffer strip being woven from super-elastic nickel-titanium alloy wire.

[0020] The above technical solution effectively alleviates stress concentration by incorporating embedded stress buffer strips woven from highly elastic nickel-titanium alloy wires at the edges of the V-groove. The nickel-titanium alloy wires possess superelastic properties, enabling them to undergo elastic deformation under external force and return to their original shape after stress release, thereby effectively dispersing stress and improving the overall stability and durability of the structure.

[0021] Preferably, after applying cement mortar, fiber components are inserted into the surface of the cement mortar. The fiber components are partially embedded in the cement mortar and partially embedded in the subsequently applied crack-resistant mortar. The fiber components include carbon fiber cloth and steel fibers. The carbon fiber cloth is bent into a wavy shape, and the steel fibers are vertically inserted into the carbon fiber cloth. The two ends of the steel fibers are flush with the crests and troughs of the carbon fiber cloth waves, respectively. The crests and troughs of the carbon fiber cloth waves are embedded in the cement mortar and the crack-resistant mortar, respectively.

[0022] The aforementioned technical solution effectively improves the crack resistance and integrity of the cement mortar layer by inserting a fiber assembly composed of carbon fiber cloth and steel fibers into the surface of the cement mortar. The wavy design of the carbon fiber cloth increases its contact area with the cement mortar, improving bond strength, while the vertical insertion of the steel fibers further enhances the crack resistance of the structure. This composite fiber assembly design not only fully utilizes the advantages of carbon fiber and steel fiber but also achieves their synergistic effect, effectively preventing crack formation and improving the durability and stability of the reinforced structure. Moreover, this application uses a large-area wavy carbon fiber cloth, which provides a larger reinforcement area and higher structural continuity, reduces splicing points between carbon fiber cloths, and avoids stress concentration and weak bonding areas caused by splicing. The wavy carbon fiber cloth, through its continuous fiber structure, can more evenly distribute stress, thereby improving the stability and crack resistance of the entire reinforced structure.

[0023] Preferably, the potting adhesive is prepared from the following components in parts by weight: 200-220 parts epoxy resin, 10-15 parts mesoporous silica nanoparticles, 3-5 parts fixative, 3-5 parts toughening agent, 0.5-1.0 parts hydroxypropyl methylcellulose, and 0.5-1.0 parts γ-aminopropyltriethoxysilane.

[0024] The grouting adhesive of this invention, through optimized formulation and the introduction of mesoporous silica nanoparticles, toughening agents, and hydroxypropyl methylcellulose, significantly improves the adhesive's bonding strength and durability. Mesoporous silica nanoparticles improve the microstructure of the grouting adhesive, enhancing its adhesion to the concrete substrate; the toughening agent strengthens the adhesive's crack resistance; and the addition of hydroxypropyl methylcellulose and γ-aminopropyltriethoxysilane further improves the curing stability and durability of the grouting adhesive. This optimized formulation not only solves the performance deficiencies of traditional grouting adhesives but also improves construction efficiency and reinforcement quality. When γ-aminopropyltriethoxysilane and hydroxypropyl methylcellulose are used simultaneously, γ-aminopropyltriethoxysilane provides chemical bonding, while hydroxypropyl methylcellulose further enhances interfacial adhesion through physical action. This synergistic effect significantly improves the bond strength between the grouting adhesive and concrete, while also improving interfacial durability and impermeability.

[0025] This invention offers at least the following beneficial effects: The industrial plant cement floor crack repair method of this invention significantly improves the durability of cement floors through techniques such as stress buffer strips, fiber components, and optimized grout formulations. Stress buffer strips effectively alleviate stress concentration problems and enhance structural stability; fiber components improve the crack resistance and integrity of the cement mortar layer; and the optimized grout formulation improves bonding strength and durability. These measures work synergistically, not only addressing the shortcomings of traditional reinforcement methods but also improving construction efficiency and reinforcement quality.

[0026] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can implement it based on the description.

[0028] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0029] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0030] A preferred embodiment of the present invention provides a method for repairing cracks in cement floors of industrial plants, comprising the following steps: S1, Base surface pretreatment Pre-treatment of the surface where cracks are located in the cement floor of the industrial plant; The pretreatment of S1 includes the following operations: chiseling away loose concrete along the crack direction down to the bottom layer to form a V-shaped groove. The groove depth is 2-3 times the maximum width of the crack, and the groove width is 3-4 times the width of the crack. The V-shaped groove and the area within 0.05m on both sides of the V-shaped groove are rinsed with high-pressure water. The groove is filled with injection adhesive, and a layer of injection adhesive is applied within 0.5m on both sides of the V-shaped groove. An interface agent A is then applied to the surface of the V-shaped groove and within 0.5m on both sides of the V-shaped groove.

[0031] S2, Cement mortar laying Apply another layer of cement mortar to the surface of the V-groove and within a 0.5m range on both sides of the V-groove; after the cement mortar has hardened, apply interface agent B to the surface of the V-groove and within a 0.5m range on both sides of the V-groove. S3, 3D elastomer mesh implantation When the cement mortar reaches 70% hardness, a three-dimensional elastomer mesh made of thermoplastic elastomer is pressed and embedded into the cement mortar, and the three-dimensional elastomer mesh is partially embedded in the cement mortar. S3 also includes the following operation: a pre-compressed waterstop strip is inserted longitudinally at the grid node of the three-dimensional grid, and the compression rate of the waterstop strip is controlled at 30%-40% to ensure that it forms an interference fit with the cement mortar in the dry state.

[0032] The mesh nodes have openings. During the implantation of the 3D elastomer mesh, when the cement mortar reaches approximately 70% hardness, construction workers apply appropriate pressure to press the 3D elastomer mesh, made of thermoplastic elastomer, into the cement mortar, ensuring that the mesh portion is successfully embedded. The embedding of the 3D elastomer mesh significantly enhances the crack resistance and toughness of the structure. Simultaneously, pre-compressed waterstop strips are inserted longitudinally at the mesh nodes of the 3D elastomer mesh. The compression rate of the waterstop strips is strictly controlled between 30% and 40%. This compression rate setting ensures that, in a dry state, the waterstop strip can form an interference fit with the cement mortar, thereby achieving a good sealing effect.

[0033] By inserting pre-compressed waterstop strips at the nodes of a three-dimensional elastomeric mesh and precisely controlling the compression rate of these strips, this ingenious design effectively prevents water penetration. This further enhances the waterproofing of the cement floor without compromising the crack resistance of the elastomeric mesh itself. This reinforcement method, combining a three-dimensional elastomeric mesh and pre-compressed waterstop strips, fully leverages the advantages of both materials. The three-dimensional elastomeric mesh provides strong crack resistance for the structure, while the waterstop strip plays a crucial role in waterproofing. Together, they enable the reinforced cement floor to exhibit greater resistance to environmental erosion.

[0034] S4. Crack-resistant mortar laying A layer of crack-resistant mortar is applied to the surface of the V-groove and within 0.5m on both sides of the V-groove, and the three-dimensional elastomer mesh is embedded in the crack-resistant mortar. S5, nano-adsorption layer hot-pressed composite When the cement mortar reaches 70% hardness, a nano-adsorption material is evenly spread on its surface using a high-frequency hot press at a temperature of 120-140℃ to form a nano-adsorption layer. The nano-adsorbent material is laid in stages under pressure at 120-140℃ using a high-frequency hot press: the initial pressure is 0.5MPa and held for 2 minutes, then increased to 1.2MPa and held for 5 minutes, and finally cooled and shaped at 0.8MPa.

[0035] By applying nano-adsorbent materials under segmented pressure using a high-frequency hot press and strictly controlling temperature and pressure parameters, this process ensures a tight bond between the nano-adsorbent materials and the cement mortar, forming a strong overall structure. In actual construction, the segmented pressurization method avoids material damage or deformation caused by excessive pressure applied at once. Precise control of the holding time and cooling / setting pressure further guarantees the quality and performance of the nano-adsorbent layer.

[0036] The pore size of the nano-adsorption layer is distributed in a gradient, with the surface pore size being 50-100 nm and the bottom pore size being 200-500 nm.

[0037] A unique gradient pore size distribution structure was employed in the fabrication of the nano-adsorption layer. This structure is designed to maintain the surface pore size between 50 and 100 nanometers, while the bottom pore size is relatively larger, ranging from 200 to 500 nanometers. The smaller surface pores efficiently adsorb tiny harmful substances, effectively preventing them from further penetrating into the structure. The larger bottom pores, on the other hand, maintain good air permeability and facilitate the diffusion of internal substances. This design avoids problems such as poor air permeability due to excessively small pore sizes, which could lead to internal pressure variations.

[0038] The gradient pore size distribution of the nano-adsorption layer achieves both high adsorption efficiency and excellent air permeability. This design allows the nano-adsorption layer to better fulfill its protective function. In practical applications, this nano-adsorption layer effectively adsorbs harmful substances from the external environment, preventing them from eroding and damaging cement floors. Simultaneously, the excellent air permeability ensures the stability of the internal structure, avoiding structural problems that may arise from changes in internal pressure. This scientifically sound structural design significantly improves the durability and protective performance of the entire reinforced structure. Compared to traditional single-pore structures, this gradient pore size distribution structure has clear advantages in both adsorption efficiency and air permeability.

[0039] The porous nano-adsorption layer is filled with sulfonated polystyrene loaded with lanthanum zirconate titanate, and its chloride ion exchange capacity is ≥1.8 mmol / g.

[0040] Chloride ions, a common harmful ion, are highly corrosive to steel reinforcement bars embedded in the ground. Sulfonated polystyrene loaded with lanthanum zirconate titanate, however, possesses a high chloride ion exchange capacity, enabling it to efficiently adsorb chloride ions and effectively prevent chloride corrosion of the steel reinforcement bars.

[0041] After being filled with this special material, the porous nano-adsorption layer can better protect the steel reinforcement in the ground from corrosion by harmful external substances. In practical applications, this material can continuously exert its adsorption effect, adsorbing and fixing harmful ions such as chloride ions in the environment within the nano-adsorption layer, thereby preventing these harmful ions from further penetrating into the ground and improving the durability and protective performance of the entire reinforced structure.

[0042] S6, Post-treatment and Maintenance After construction, spray a penetrating rust inhibitor and cover with a moisturizing film for 72 hours at 20±2℃.

[0043] In the above technical solution, the first step is to pre-treat the substrate. Construction workers carefully chisel away loose concrete along the crack's direction down to the bottom layer, forming a V-shaped groove. The depth of this groove is 2 to 3 times the maximum width of the crack, and its width is 3 to 4 times the crack's width. Next, the V-shaped groove and the area within 0.05 meters on both sides of the groove are rinsed with high-pressure water to ensure the surface is clean and free of impurities. Then, injection adhesive is filled into the V-shaped groove, and a layer of injection adhesive is applied within 0.5 meters on both sides of the groove. Simultaneously, a layer of interface agent A is applied to the surface of the V-shaped groove and within 0.5 meters on both sides, laying a good foundation for the adhesion of subsequent materials.

[0044] The cement mortar laying stage then begins. A layer of cement mortar is evenly applied to the surface of the V-groove and within a 0.5-meter radius on both sides. After the cement mortar hardens, interface agent B is applied to the same area to further enhance surface density and adhesion. When the cement mortar reaches approximately 70% hardness, the crucial three-dimensional elastomer mesh implantation stage begins. Using appropriate pressure, the construction workers press the three-dimensional elastomer mesh, made of thermoplastic elastomer, into the cement mortar, embedding the mesh portion within the mortar to enhance overall crack resistance and toughness. Next, a layer of crack-resistant mortar is applied to the surface of the V-groove and within a 0.5-meter radius on both sides, embedding the three-dimensional elastomer mesh portion within the crack-resistant mortar to further improve crack resistance. While the cement mortar reaches approximately 70% hardness, the nano-adsorption layer hot-pressing composite process is initiated. Using a high-frequency hot press, nano-adsorbent material is evenly spread on the surface of cement mortar at a temperature of 120 to 140 degrees Celsius, forming a nano-adsorbent layer. This layer can adsorb harmful substances, providing additional protection for the structure. Finally, post-treatment curing is performed. After construction, a penetrating rust inhibitor is sprayed, followed by covering with a moisturizing film. Curing is then carried out for 72 hours at approximately 20 degrees Celsius (fluctuating by 2 degrees Celsius) to ensure the long-lasting stability of the reinforcement effect.

[0045] Through the above construction steps, the structural strength and durability of the cement floor were significantly improved. Cracks were effectively controlled, crack resistance was greatly enhanced, and service life was significantly extended.

[0046] In another technical solution, after step S6, the following steps are also included: an embedded stress buffer strip is provided at the edge of the V-groove within a range of 0.5m on both sides, and the buffer strip is woven from super-elastic nickel-titanium alloy wire.

[0047] Nickel-titanium alloy wire possesses unique superelastic properties, enabling it to undergo elastic deformation under external force and return to its original shape after stress release. This characteristic allows stress buffer strips to effectively disperse stress and alleviate stress concentration during the use of concrete floors. By incorporating embedded stress buffer strips woven from superelastic nickel-titanium alloy wires along the edges of the V-groove, the overall stability and durability of the structure can be significantly improved. In practical applications, these stress buffer strips effectively disperse stress, preventing structural damage caused by stress concentration.

[0048] In another technical solution, after applying cement mortar, fiber components are inserted into the surface of the cement mortar. The fiber components are partially embedded in the cement mortar and partially embedded in the subsequently applied crack-resistant mortar. The fiber components include carbon fiber cloth and steel fibers. The carbon fiber cloth is bent into a wavy shape, and the steel fibers are vertically inserted into the carbon fiber cloth. The two ends of the steel fibers are flush with the crests and troughs of the carbon fiber cloth waves, respectively. The crests and troughs of the carbon fiber cloth waves are embedded in the cement mortar and the crack-resistant mortar, respectively.

[0049] During construction, after the cement mortar is applied, a special fiber assembly is inserted into its surface. This assembly consists of carbon fiber cloth and steel fibers. The carbon fiber cloth is cleverly bent into a wave shape, while the steel fibers are vertically inserted into it. Specifically, the two ends of the steel fibers are flush with the crests and troughs of the carbon fiber cloth waves, respectively. In practice, the crests and troughs of the carbon fiber cloth waves are partially embedded in the cement mortar and the subsequently applied crack-resistant mortar, respectively. This design fully leverages the advantages of both carbon fiber and steel fiber, achieving a synergistic effect between the two.

[0050] The wavy design of the carbon fiber fabric significantly increases its contact area with cement mortar, thereby substantially improving the bond strength between the two. Simultaneously, the vertical insertion of steel fibers further enhances the structure's crack resistance. This composite fiber assembly design not only effectively prevents crack formation but also improves the durability and stability of the reinforced structure. The large-area wavy carbon fiber fabric provides a larger reinforcement area and greater structural continuity, reducing the number of splicing points between carbon fiber fabrics. This avoids stress concentration and weak bonding areas caused by splicing, resulting in a more uniform and stable reinforced structure.

[0051] In another technical solution, the potting adhesive is prepared from the following components in parts by weight: 200-220 parts epoxy resin, 10-15 parts mesoporous silica nanoparticles, 3-5 parts fixative, 3-5 parts toughening agent, 0.5-1.0 parts hydroxypropyl methylcellulose, and 0.5-1.0 parts γ-aminopropyltriethoxysilane. The fixative can be aniline, ethylenediamine, or a mixture of both. The toughening agent can be tung oil-based glyceryl monobutyl ester dibutyrate.

[0052] In actual construction, this optimized grout formula allows for precise control of sag, ensuring moderate fluidity. It avoids sagging while effectively filling cracks, especially those at the bottom of concrete box girders, where it provides excellent filling results. Compared to conventional grouts, this grout performs exceptionally well in filling surface cracks, without the problem of dripping. The use of this grout significantly improves the quality and efficiency of crack treatment in industrial plant concrete floors, providing a solid foundation for subsequent reinforcement work.

[0053] Before reinforcement, the crack widths in the bottom slab and web of the box girder were generally between 0.05 and 0.4 mm. After reinforcement, the crack width was effectively controlled, with most cracks reduced to below 0.02 mm, and the crack opening and closing phenomenon disappeared. Before reinforcement, there was a certain degree of deflection at the mid-span of the box girder, and the deflection verification coefficient in the static load test was 15%-20% higher than normal. After reinforcement, the measured deflection value and verification coefficient of the box girder were significantly improved, with the deflection verification coefficient dropping to a level comparable to that of a box girder without defects. After reinforcement, the tensile stress and principal tensile stress in each section of the box girder were significantly reduced, and the stress verification coefficient decreased by approximately 20% compared to before reinforcement. This indicates that the reinforcement measures effectively improved the stress state of the box girder, bringing it closer to the design requirements.

[0054] When using this grout during application, the sag can be precisely controlled (0.5 mm), ensuring that the grout has moderate fluidity, preventing sagging and fully filling cracks. It is particularly effective for filling cracks at the bottom of concrete box girders. Conventional grouts have higher fluidity and are suitable for filling cracks on the upper surface, but are not suitable for cracks on the lower surface, which can cause the grout to drip.

[0055] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A method for repairing cracks in a cement floor of an industrial plant, characterized in that, The method comprises the following steps: S1, base surface pretreatment The surface of the cement floor crack of the industrial plant is pretreated, the loose concrete along the crack direction is chiseled to the bottom layer, a V-shaped groove is formed and cleaned; S2, cement mortar laying A layer of cement mortar is continuously coated on the surface of the V-shaped groove and the surface within 0.5 m on both sides of the V-shaped groove; after the cement mortar hardens, an interface agent B is continuously coated on the surface of the V-shaped groove and the surface within 0.5 m on both sides of the V-shaped groove; S3, three-dimensional elastomer grid implantation When the hardness of the cement mortar reaches 70%, a three-dimensional elastomer grid made of thermoplastic elastomer is pressed and embedded into the cement mortar by pressure, and part of the three-dimensional elastomer grid is embedded into the cement mortar; S4, anti-cracking mortar laying A layer of anti-cracking mortar is continuously coated on the surface of the V-shaped groove and the surface within 0.5 m on both sides of the V-shaped groove, and part of the three-dimensional elastomer grid is embedded into the anti-cracking mortar; S5, nano adsorption layer hot pressing When the hardness of the cement mortar reaches 70%, a nano adsorption material is uniformly laid on the surface of the cement mortar by a high-frequency hot press at a temperature of 120-140°C to form a nano adsorption layer; S6, post-treatment and maintenance After the construction is completed, a permeable rust inhibitor is sprayed, and a moisture-retaining film is covered for maintenance for 72 hours in an environment of 20±2°C.

2. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, The pretreatment of S1 comprises the following operations: The loose concrete along the crack direction is chiseled to the bottom layer to form a V-shaped groove, the groove depth is 2-3 times the maximum width of the crack, the groove width is 3-4 times the width of the crack, the V-shaped groove and the positions within 0.05 m on both sides of the V-shaped groove are washed with high-pressure water, the V-shaped groove is filled with injection glue, a layer of injection glue is coated within 0.5 m on both sides of the V-shaped groove, and an interface agent A is continuously coated on the surface of the V-shaped groove and the surface within 0.5 m on both sides of the V-shaped groove.

3. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, In S3, the following operations are further included: A water stop strip in a pre-compressed state is longitudinally inserted at the grid nodes of the three-dimensional grid, and the compression rate of the water stop strip is controlled at 30%-40% to ensure interference fit with the cement mortar in a dry state.

4. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, The porous nano adsorption layer adopts a gradient pore size distribution structure, the surface layer has a pore size of 50-100 nm, and the bottom layer has a pore size of 200-500 nm.

5. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, The nano adsorption material is laid by a high-frequency hot press at a temperature of 120-140°C through segmented pressure: initial pressure 0.5 MPa for 2 minutes, pressure increased to 1.2 MPa for 5 minutes, and finally 0.8 MPa for cooling and shaping.

6. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, The porous nano adsorption layer is filled with sulfonated polystyrene loaded with zirconium titanate lanthanum, and the chloride ion exchange capacity is ≥1.8 mmol / g.

7. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, After step S6, the following step is further included: an embedded stress buffer belt is provided at the edge positions within 0.5 m on both sides of the V-shaped groove, and the buffer belt is woven by super-elastic nickel-titanium alloy wire.

8. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, After the cement mortar is applied, a fiber assembly is inserted into the surface of the cement mortar, the fiber assembly is partially embedded in the cement mortar and partially embedded in the anti-cracking mortar applied subsequently, the fiber assembly comprises a carbon fiber cloth and steel fibers, the carbon fiber cloth is bent in a wave shape, the steel fibers are vertically inserted on the carbon fiber cloth, and the two ends of the steel fibers are flush with the wave peaks and wave troughs of the carbon fiber cloth respectively, and the wave peaks and wave troughs of the carbon fiber cloth are embedded in the cement mortar and the anti-cracking mortar respectively.

9. The industrial plant concrete floor crack repair construction method according to claim 1, characterized by, The pouring adhesive is prepared from the following components by weight: 200-220 parts of epoxy resin, 10-15 parts of mesoporous silica nanoparticles, 3-5 parts of a fixing agent, 3-5 parts of a toughening agent, 0.5-1.0 parts of hydroxypropyl methyl cellulose, and 0.5-1.0 parts of gamma-aminopropyl triethoxysilane.