Concrete crack treatment method

Abstract

The invention relates to a concrete crack treatment method, and relates to the technical field of concrete crack treatment, and the concrete crack treatment method comprises the following steps: if a concrete crack with the width of less than 0.2 mm is treated in a surface sealing manner, after the surface treatment of the concrete crack, the concrete crack is brushed with a crack repairing material or is pressurized and smeared with a structural adhesive, and then the concrete crack is repaired. The surface crack material is uniform and flat after being cured, and cracks and falling are avoided; if the width of the concrete crack is larger than or equal to 0.2 mm, a method for sealing the crack through pouring epoxy slurry is adopted for treatment; according to the method, different treatment methods are adopted for treating concrete cracks with different sizes, it can be guaranteed that the treated concrete cracks are smooth in surface after being cured again, new cracks do not appear, and the falling phenomenon does not exist.

Description

Technical Field

[0001] This application relates to the technical field of concrete crack treatment, and particularly to a method for treating concrete cracks. Background Art

[0002] Concrete cracks are common problems in concrete structures. The existence of cracks will weaken the bearing capacity of the concrete structure, reduce the durability and impermeability of the structure. Under the action of long-term load, the cracks may further expand, leading to structural failure. Cracks will cause leakage in buildings, affecting their waterproof performance and further affecting the service functions of buildings. For example, cracks in the basement will cause groundwater infiltration, affecting the normal use of the basement; cracks on the roof will cause rainwater leakage, damaging the interior decoration and items.

[0003] There are many repair techniques for concrete cracks in the prior art. However, the inventor found the following problems in the process of implementing this application: During the construction process, the strength of the repaired concrete cracks is inconsistent with that of the original structure, resulting in the easy appearance of secondary cracks at the repaired part. At the same time, due to the air inside the cracks during the repair process, the strength of the repaired structure is reduced. Summary of the Invention

[0004] The purpose of this application is to provide a method for treating concrete cracks.

[0005] A method for treating concrete cracks provided by this application adopts the following technical solution: A method for treating concrete cracks, the method for treating concrete cracks includes: For concrete cracks with a width less than 0.2 mm, surface sealing is used for treatment. After the surface of the concrete cracks is treated, a crack repair material is applied by brushing or pressure-applied with a structural adhesive. After the surface crack material is cured, it should be uniform, flat, without cracks and without peeling. For concrete cracks with a width greater than or equal to 0.2 mm, the method of injecting epoxy slurry to seal the cracks is used for treatment.

[0006] By adopting the above technical solution, for concrete cracks of different sizes, we use different treatment methods for treatment, which can ensure that the surface of the treated concrete cracks is flat after re-curing, without new cracks and without peeling.

[0007] Furthermore, the specific steps of adopting the surface sealing method are as follows: S1. Use compressed air above 0.2 MPa to clean the periphery of the cracks; S2. Wash the surface of the cracks along the crack length with acetone; S3. Apply the prepared structural adhesive evenly and forcefully on the surface of the crack. S4. After the structural adhesive is completely cured, use a angle grinder to polish the surface of the crack to make the concrete surface flat.

[0008] Further, the structural adhesive uses modified epoxy putty.

[0009] By adopting the above technical solution, for concrete cracks with a width less than 0.2 mm, we use the surface sealing method for treatment, which is convenient and fast, and can quickly repair the concrete cracks. At the same time, the structural adhesive uses modified epoxy putty, which can increase the strength of the crack repair area.

[0010] Further, the specific steps of the epoxy grout injection method for sealing cracks are as follows: A1. Drill a through-crack hole on the surface of the concrete crack, and the obtained hole is used as a grouting guiding hole. A2. Use high-pressure air to blow and clean the hole to avoid ash and slag blocking the hole. Then, from top to bottom along the crack, clean the dust and floating slurry within a range of 3 cm - 4 cm on both sides with a small hammer, hand shovel, steel brush, sandpaper, and brush in turn. Level the surface of the concrete member, chisel off the protruding parts, and then wipe it with acetone to remove the oil stains around the crack. A3. Paste the grouting nozzle and seal the surface of the crack. Paste the grouting nozzle on the concrete crack through the hole, and then seal the surface of the concrete crack to form a sealing band. A4. After the sealing band hardens, conduct a pressure air test to check whether the sealing band is airtight. A5. Operation of injecting epoxy grout. Use the air pump injection method to inject epoxy grout into the concrete crack. A6. For the cracks that have been grouted, after the slurry polymerizes and cures, remove the grouting nozzles one by one, and level the paste grouting nozzle with epoxy resin putty. Finally, apply a layer of epoxy cement slurry on the surface of each crack to ensure airtight sealing and make its color consistent with the surface of the original concrete structure. After grouting, use compressed air to blow the residual liquid in the grouting tank and grouting pipe clean, and wash the pipeline and tools with acetone for future use.

[0011] By adopting the above technical solution, for concrete cracks with a width greater than or equal to 0.2 mm, this method is used to repair them, which can make the strength and durability after repair exceed the performance of the original concrete. At the same time, the surface treatment of the repaired concrete crack is relatively delicate, which will not affect the surface appearance. The repaired crack can effectively prevent water from seeping into the interior of the main structure, ensuring the durability of the main structure.

[0012] Further, in the above step A1, when concrete cracks appear on the web, top plate or bottom plate, holes shall be drilled along the crack direction, with a hole depth of 5 cm, a hole diameter of 8 mm, and a hole spacing of 35 cm. At the intersection of cracks, holes shall be drilled at the intersection.

[0013] By adopting the above technical solution, it is ensured that during grouting, the epoxy grout can be fully poured into the inside of the holes, and such hole setting ensures the strength around the cracks and after crack repair.

[0014] Further, in the above step A3, when pasting the grouting nozzle, the rust on the bottom plate of the grouting nozzle shall be removed completely and wiped clean with acetone. Then, epoxy mastic shall be evenly applied around the bottom plate of the grouting nozzle with a thickness of 1 - 2 mm. The grouting nozzle shall be aligned with the hole and pasted on the crack. The spacing of the grouting nozzles is 35 - 40 cm, and each crack shall have at least one inlet hole and one exhaust hole. The grouting nozzle shall be pasted firmly, and the surrounding shall be plastered into a fish - ridge shape for sealing.

[0015] By adopting the above technical solution, first, the cleanliness of the grouting nozzle is ensured, which avoids the pollution of the concrete cracks by the used instruments. At the same time, the epoxy mastic plays a bonding role, which is beneficial to the repair of the concrete cracks. The setting of the exhaust hole is to prevent air from remaining in the repaired cracks due to insufficient exhaust during the grouting operation, which affects the repair effect.

[0016] Further, in the above step A3, along the concrete crack, a "V" - shaped groove is chiseled manually or with a pneumatic pick, blown clean with high - pressure air, then wiped with acetone to remove the oil stain around the crack, and then epoxy mortar is stuffed into the groove with a putty knife to form a sealing band.

[0017] By adopting the above technical solution, the concrete crack and its surrounding area are cleaned, avoiding the influence of impurities and dust on the repaired part of the concrete crack, and enhancing the strength of the repaired crack.

[0018] Further, in the above step A4, the specific steps for checking whether the sealing band is sealed tightly are as follows: Pass compressed gas through the grouting nozzle, and control the air pressure at 0.2 - 0.4 MPa. At this time, apply soapy water on the sealing band and around the grouting nozzle. If no bubbles appear on the sealing band after air passage, the sealing band is sealed tightly; if bubbles appear on the sealing band after air passage, the sealing band is not sealed tightly and needs to be sealed again.

[0019] By adopting the above technical solution, it is ensured whether the sealing band is sealed tightly by checking the sealing strength of the sealing band.

[0020] Further, in the above step A5, the specific steps of the air - pump pressure - injection method are as follows: The grouting tank is tightly connected to the grouting nozzle with a high - pressure transparent polyvinyl chloride pipe, and the pressure is controlled at 0.2 MPa - 0.4 MPa during the grouting process; The perfusion sequence is as follows: For horizontal cracks, gradually press from the low end to the high end; For vertical web cracks, gradually inject from the bottom up; After starting to grout from one end, when the slurry sprayed out from the grouting nozzle at the other end has the same concentration as the injected slurry after discharging the gas in the crack, the grouting can be stopped, and the grouting nozzle can be sealed while maintaining the pressure; When grouting through cracks, if no slurry appears on the other side after single-sided grouting, grouting can be carried out on the other side once. For non-through web cracks, spraying slurry is required near the grouting nozzle. If foam appears, it indicates air leakage at that part, and the air leakage part needs to be sealed again.

[0021] Furthermore, when performing crack grouting treatment, high-quality Class A solvent-free modified epoxy resin-based crack injection adhesive is used, and the viscosity of the injection adhesive is less than 200 MPa·s.

[0022] By adopting the above technical solution, using high-quality Class A solvent-free modified epoxy resin-based crack injection adhesive to grout the cracks can enhance the strength and durability of the repaired structure.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. For concrete cracks of different sizes, we adopt different treatment methods, which can ensure that the surface of the treated concrete cracks is flat after re-curing, no new cracks appear, and there is no peeling phenomenon. For concrete cracks with a width greater than or equal to 0.2 mm, this method is used for repair, which can make the strength and durability after repair exceed the performance of the original concrete. At the same time, the surface treatment of the repaired concrete cracks is relatively delicate, which will not affect the surface appearance, and the repaired cracks can effectively prevent water from penetrating into the interior of the main structure, ensuring the durability of the main structure; 2. For concrete cracks with a width less than 0.2 mm, the surface sealing method is adopted for treatment, which is convenient and fast, and can quickly repair the concrete cracks. At the same time, the structural adhesive uses modified epoxy putty, which can increase the strength of the crack repair area. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flowchart of the concrete crack treatment method in Embodiment 1 of the present application; Figure 2 is a flowchart of the concrete crack treatment method in Embodiment 2 of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will further describe the present application in detail in conjunction with the attached Figure 1 - Figure 2 , to make a further detailed description of the present application.

[0026] Example 1: Please refer to Figure 1 , a method for treating concrete cracks. For concrete cracks with a width less than 0.2 mm, surface sealing is adopted for treatment. After the surface of the concrete cracks is treated, the crack repair material is brushed or pressure-applied with structural adhesive, and after the surface crack material is cured, it should be uniform, flat, without cracks and without peeling; The specific steps of adopting the surface sealing method are as follows: S1. Use compressed air above 0.2 MPa to clean the periphery of the crack; S2. Wash the surface of the crack along the crack length with acetone; S3. Scrape the prepared structural adhesive evenly on the surface of the crack. The structural adhesive uses modified epoxy putty; [[ID=X]] S4. After the structural adhesive is completely cured, grind the surface of the crack with a angle grinder to make the concrete surface flat.

[0027] For concrete cracks with a width less than 0.2 mm, we adopt the surface sealing method for treatment, which is convenient and fast, and can quickly repair the concrete cracks. At the same time, the structural adhesive uses modified epoxy putty, which can increase the strength of the crack repair area.

[0028] Example 2: Please refer to Figure 2 , a method for treating concrete cracks. For concrete cracks with a width greater than or equal to 0.2 mm, the method of injecting epoxy slurry to seal the cracks is adopted for treatment: The specific steps of the method of injecting epoxy slurry to seal the cracks are as follows: A1. Drill a through-crack hole on the surface of the concrete crack. The drilled hole is used as a grouting guiding hole; when the concrete crack appears on the web, top plate or bottom plate, drill holes along the crack direction. The hole depth is 5 cm, the hole diameter is 8 mm, and the hole spacing is 35 cm. At the intersection of the cracks, holes should be drilled to ensure that when grouting, the epoxy slurry can be fully poured into the holes. Such hole setting ensures the strength around the crack and after crack repair. A2. Use high-pressure air to blow and wash the holes clean to avoid ash and slag blocking the holes. Then, along the crack from top to bottom, use a small hammer, hand shovel, steel brush, sandpaper, and brush to clean the dust and floating slurry within 3 cm - 4 cm on both sides in turn. Level the surface of the concrete member, chisel off the protruding parts, and then wipe with acetone to remove the oil stains around the crack; A3. Paste the grouting nozzle and seal the surface of the crack. Paste the grouting nozzle on the concrete crack through the hole, and then seal the surface of the concrete crack to form a sealing band; When pasting the grouting nozzles, the rust on the bottom plate of the grouting nozzles shall be removed completely and wiped clean with acetone. Then, epoxy mortar shall be evenly smeared around the bottom plate of the grouting nozzles with a thickness of 1-2 mm. Align the grouting nozzles with the holes and paste them on the cracks. The spacing between the grouting nozzles is 35-40 cm, and there shall be at least one slurry inlet hole and one air vent for each crack. The grouting nozzles shall be firmly pasted, and the surrounding shall be smeared into a fish-back shape for sealing. First, ensure the cleanliness of the grouting nozzles to avoid pollution of the concrete cracks by the used instruments. At the same time, the epoxy mortar plays a bonding role, which is beneficial to the repair of the concrete cracks. The setting of the air vents is to prevent air from remaining in the repaired cracks due to insufficient air exhaust during the grouting operation, which affects the repair effect; Chisel a "V"-shaped groove along the concrete crack manually or with a pneumatic pick, blow it clean with high-pressure air, then wipe it with acetone to remove the oil stain around the crack, and then use a putty knife to embed epoxy mortar into the groove to form a sealing band. Clean the concrete crack and its surroundings to avoid the influence of impurities and dust on the repaired part of the concrete crack and enhance the strength of the repaired crack A4. After the sealing band hardens, conduct a compressed air test to check whether the sealing band is airtight; The specific steps to check whether the sealing band is airtight are as follows: Pass compressed air through the grouting nozzle, and control the air pressure at 0.2-0.4 MPa. At this time, apply soapy water on the sealing band and around the grouting nozzle. If no bubbles appear on the sealing band after ventilation, the sealing band is airtight; if bubbles appear on the sealing band after ventilation, the sealing band is not airtight and needs to be sealed again. Check whether the sealing band is airtight by checking the sealing strength of the sealing band; A5. Operate the epoxy slurry injection, and use an air pump injection method to inject epoxy slurry into the concrete crack; A6. For the cracks that have been grouted, after the slurry polymerizes and cures, remove the grouting nozzles one by one, and level the place where the grouting nozzles are pasted with epoxy resin mortar. Finally, apply another layer of epoxy cement slurry on the surface of each crack to ensure tight sealing and make its color consistent with the surface of the original concrete structure; The specific steps of the air pump injection method are as follows: Connect the grouting tank and the grouting nozzle tightly with a high-pressure transparent polyvinyl chloride pipe, and control the pressure at 0.2 MPa-0.4 MPa during the grouting process; [[ID=ID=16]]The injection sequence is as follows: For horizontal cracks, gradually press from the low end to the high end; For vertical web cracks, gradually inject from the bottom up; After starting to press the slurry from one end, when the slurry sprayed out from the grouting nozzle at the other end has the same concentration as the injected slurry after discharging the gas in the crack, the slurry injection can be stopped, and the grouting nozzle can be sealed while maintaining the pressure; When grouting through cracks, if slurry does not come out on the other side after grouting on one side, grouting can be carried out under pressure on the other side. For non-through web cracks, spraying slurry is required near the grouting nozzle. If foam appears, it indicates air leakage at that part, and the air leakage part needs to be sealed again. When carrying out crack grouting treatment, high-quality Class A solvent-free modified epoxy resin-based crack grouting adhesive is used. The viscosity of the grouting adhesive is less than 200 MPa·s. Using high-quality Class A solvent-free modified epoxy resin-based crack grouting adhesive to carry out grouting treatment on cracks can enhance the strength and durability of the repaired structure. After grouting is completed, use compressed air to blow the residual liquid in the grouting tank and grouting pipe clean, and flush the pipeline and tools with acetone for future use.

[0029] For concrete cracks with a width greater than or equal to 0.2 mm, using this method to repair them can make the strength and durability after repair exceed the performance of the original concrete. At the same time, the surface treatment of the repaired concrete cracks is relatively delicate and will not affect the surface appearance. The repaired cracks can effectively prevent water from seeping into the interior of the main structure, ensuring the durability of the main structure.

[0030] The implementation principle of the embodiments of this application is as follows: For concrete cracks with a width less than 0.2 mm, surface sealing is used for treatment. After the surface of the concrete cracks is treated, use crack repair materials to brush or apply structural adhesive under pressure. After the surface crack materials are cured, they should be uniform, flat, without cracks and without peeling; For concrete cracks with a width greater than or equal to 0.2 mm, the method of grouting epoxy slurry to seal the cracks is used for treatment. For concrete cracks of different sizes, we use different treatment methods for treatment, which can ensure that the surface of the treated concrete cracks is flat after re-curing, without new cracks and without peeling.

[0031] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A method for treating concrete cracks, characterized in that, The concrete crack treatment method includes the following: For concrete cracks with a width less than 0.2 mm, surface sealing is adopted for treatment. After the surface of the concrete cracks is treated, a crack repair material is painted or a structural adhesive is applied under pressure to smear. After the surface crack material is cured, it should be uniform, flat, without cracks and without peeling off. For concrete cracks with a width greater than or equal to 0.2 mm, the method of injecting epoxy slurry to seal the cracks is adopted for treatment.

2. The method for treating concrete cracks according to claim 1, characterized in that: The specific steps of adopting the surface sealing method are as follows: S1. Use compressed air above 0.2 MPa to clean the periphery of the crack clearly. S2. Wash the surface of the crack along the crack length with acetone. S3. Apply the prepared structural adhesive evenly and forcefully on the surface of the crack. S4. After the structural adhesive is completely cured, use a angle grinder to polish the surface of the crack to make the concrete surface flat.

3. A method for treating concrete cracks according to claim 2, characterized in that: The structural adhesive adopts modified epoxy putty.

4. A method for treating concrete cracks according to claim 1, characterized in that: The specific steps of the method of injecting epoxy slurry to seal the cracks are as follows: A1. Drill a through-crack hole on the surface of the concrete crack, and the obtained hole is used as a grouting guiding hole. A2. Blow and wash the hole with high-pressure air to avoid ash blocking the hole. Then, from top to bottom along the crack, clean the dust and floating slurry within the range of 3 cm - 4 cm on both sides with a small hammer, hand shovel, steel brush, sandpaper, and brush in turn. Level the surface of the concrete member, chisel off the protruding part, and then wipe it with acetone to remove the oil stain around the crack. A3. Paste the grouting nozzle and seal the surface of the crack. Paste the grouting nozzle on the concrete crack through the hole, and then seal the surface of the concrete crack to form a sealing belt. A4. After the sealing belt is hardened, conduct a air pressure test to check whether the sealing belt is sealed tightly. A5. Operate the injection of epoxy slurry, and use an air pump injection method to inject epoxy slurry into the concrete crack. A6. For the cracks that have been grouted, after the slurry polymerizes and cures, remove the grouting nozzles one by one, and level the place where the grouting nozzle is pasted with epoxy resin putty. Finally, apply a layer of epoxy cement slurry on the surface of each crack to ensure tight sealing and make its color consistent with the surface of the original concrete structure. After the grouting is completed, use compressed air to blow the residual liquid in the grouting tank and the grouting pipe clean, and wash the pipeline and tools with acetone for future use.

5. A method for treating concrete cracks according to claim 4, characterized in that: In the above step A1, when the concrete crack appears on the web, top plate or bottom plate, drill holes along the crack direction, with a hole depth of 5 cm, a hole diameter of 8 mm, and a hole spacing of 35 cm. Where the cracks cross, drill holes at the crossing place.

6. A method for treating concrete cracks according to claim 4, characterized in that: In the above step A3, when pasting the grouting nozzle, remove the rust on the chassis of the grouting nozzle and wipe it clean with acetone. Then, evenly smear the epoxy putty around the chassis of the grouting nozzle with a thickness of 1 - 2 mm. Align the grouting nozzle with the hole and paste it on the crack. The spacing of the grouting nozzles is 35 - 40 cm, and each crack must have at least one slurry inlet hole and one exhaust hole. The grouting nozzle should be pasted firmly, and the periphery should be smeared into a fish ridge shape for sealing.

7. A method for treating concrete cracks according to claim 6, characterized in that: In the above step A3, chisel a "V" - shaped groove along the concrete crack manually or with a pneumatic pick, blow and wash it clean with high - pressure air, then wipe it with acetone to remove the oil stain around the crack, and then use a putty knife to plug epoxy mortar into the groove to form a sealing belt.

8. A method for treating concrete cracks according to claim 4, characterized in that: In the above step A4, the specific steps for checking whether the sealing tape is airtight are as follows: Pass compressed gas through the grouting nozzle, and control the air pressure at 0.2 - 0.4 MPa. At this time, apply soapy water on the sealing tape and around the grouting nozzle. If no bubbles are generated on the sealing tape after ventilation, the sealing tape is airtight; if bubbles are generated on the sealing tape after ventilation, the sealing tape is not airtight and needs secondary sealing.

9. A method for treating concrete cracks according to claim 4, characterized in that: In the above step A5, the specific steps of the air pump injection method are as follows: The grouting tank and the grouting nozzle are tightly connected with a high-pressure transparent polyvinyl chloride pipe, and the pressure is controlled at 0.2 MPa - 0.4 MPa during the grouting process; The pouring sequence is: For horizontal cracks, gradually press from the low end to the high end; For vertical web cracks, gradually inject from bottom to top; After starting grouting from one end, when the grouting nozzle at the other end sprays out slurry with the same concentration as the injected slurry after discharging the gas in the crack, the grouting can be stopped, and the grouting nozzle is blocked while maintaining the pressure; When pouring through cracks, if no slurry appears on the other side after single-sided pouring, the other side can be pressure-grouted once. For non-through web cracks, spraying slurry is required near the grouting nozzle. If foam appears, it indicates that the part is air-leaking and the air-leaking part needs to be sealed again.

10. A method for treating concrete cracks according to claim 9, characterized in that: When performing crack grouting treatment, a high-quality Class A solvent-free modified epoxy resin-based crack injection adhesive is used, and the viscosity of the injection adhesive is less than 200 MPa·s.

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