Waterproof and impervious concrete crack repairing and testing device

Abstract

The utility model relates to a waterproof impervious concrete crack repair testing device, which is used for testing the crack repair degree of a concrete test piece, and comprises two clamping plates capable of movably clamping and fixing the two ends of the concrete test piece; the water injection assembly is arranged on the upper surface of the crack of the concrete test piece and comprises a water injection pipe located on the upper surface of the crack, a water inlet and a water outlet, the water inlet and the water outlet are formed in the side portion of the water injection pipe, and the water outlet is lower than the water inlet; and the water receiving container is arranged at the bottom of the crack of the concrete test piece and is used for receiving water flowing out of the crack. Compared with the prior art, the device has the advantages of complete functions, simplicity in operation, high test precision and the like.

Description

Technical Field

[0001] This utility model relates to the field of concrete material testing technology, and in particular to a testing device for repairing cracks in waterproof and impermeable concrete. Background Technology

[0002] In recent years, with the rapid development of construction engineering, concrete structures have been widely used in various buildings and infrastructures. However, during use, concrete structures often develop cracks due to environmental factors, material aging, and construction quality issues. Cracks not only affect the aesthetics of buildings but also reduce the durability and safety of the structure, and can even lead to serious engineering accidents. To prevent moisture and harmful substances from penetrating into the concrete through cracks, thereby corroding the reinforcing steel and reducing the concrete strength, waterproofing agents are typically used to repair the cracks. Waterproofing agents can effectively fill cracks, prevent moisture penetration, and improve the waterproof performance and durability of concrete structures. Currently, there are various types of waterproofing agents on the market, each with different properties and applicable ranges. To evaluate the repair effects of different waterproofing agents, performance testing is necessary.

[0003] However, existing crack testing devices are difficult to assess the repair effect of cracks. For example, patent publication number CN101858868A discloses a method and device for testing concrete cracks. For cracks that may have penetrated both sides of the concrete, the inlet head is attached to one end of the crack on one side of the concrete, and the outlet head is attached to one end of the crack on the other side. First, the outlet switch is opened, and an indicator solution is filled into the U-shaped tube. The liquefied gas cylinder is then opened, and the time is selected based on the crack width and thickness, i.e., crack depth. If bubbles are generated, it indicates that the crack has penetrated both sides of the concrete; if no bubbles are generated, it indicates that the crack has not penetrated. However, this testing method requires adjusting the position of the inlet / outlet head according to the gas density (e.g., hydrogen requires top inlet, butane requires bottom inlet), which is cumbersome and requires carrying multiple gases. Furthermore, it is greatly affected by environmental interference, such as temperature changes affecting gas volume and pressure, and wind speed interfering with bubble observation in the U-shaped tube, reducing the reliability of outdoor testing. Therefore, developing a testing device that is simple to operate, has high testing accuracy, and is less affected by environmental interference is of great significance for evaluating the repair performance of waterproofing agents and guiding engineering practice. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a waterproof and seepage-resistant concrete crack repair testing device that is simple to operate, has high testing accuracy, and is less affected by environmental interference.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] A testing device for repairing cracks in waterproof and impermeable concrete, the testing device being used to test the degree of crack repair in concrete specimens, the testing device comprising:

[0007] Two movable clamping plates are used to hold and fix both ends of the concrete specimen.

[0008] A water injection assembly is installed on the upper surface of the crack in the concrete specimen, including a water injection pipe located on the upper surface of the crack, an inlet and an outlet located on the side of the water injection pipe, wherein the height of the outlet is lower than the height of the inlet.

[0009] And a water-receiving container placed at the bottom of the crack in the concrete specimen to collect water flowing out of the crack.

[0010] Furthermore, the clamps are located on both sides of the crack in the concrete specimen.

[0011] Furthermore, the two clamping plates are moved by several screws passing through them.

[0012] Furthermore, the clamping plate has several threaded holes at its four corners for the screw to pass through.

[0013] Furthermore, bolts for clamping and fixing the concrete specimen and the clamping plate are provided through the screw.

[0014] Furthermore, the water injection pipe is installed on the upper surface of the concrete specimen using conventional methods in the field, such as embedding, drilling and embedding, bolting or clamping, or gluing.

[0015] Furthermore, a sealing element is provided at the connection between the water injection pipe and the concrete specimen for sealing.

[0016] Furthermore, the sealing element includes a sealing layer formed by a sealing structure or sealing material. The sealing structure includes rubber sealing rings, silicone sealing rings, polytetrafluoroethylene (PTFE) raw material tape, metal sealing collars, and rubber gaskets. The sealing materials include thread sealant, polyurethane sealant, sulfur putty, epoxy resin mortar, paraffin wax, asphalt, silicone sealant, and sealant paste.

[0017] Furthermore, the diameter of the water injection pipe is greater than the length and width of the crack.

[0018] Furthermore, the inlet is connected to an inlet pipe, which is equipped with a pressure pump and a valve. The inlet pipe is connected to a water source, the valve is used to switch the water source on and off, and the pressure pump is used to control the size and flow rate of the water source. The water source is introduced into the injection pipe through the inlet pipe. The outlet is connected to an outlet pipe.

[0019] Furthermore, the height of the outlet is 0.5 to 2 times the height of the concrete specimen, which is used to discharge excess water to maintain the water level difference and thus maintain a constant water pressure.

[0020] Furthermore, the height of the inlet is higher than the height of the outlet, and is 1.1 to 2 times the height of the outlet, preferably 1.1 to 1.5 times.

[0021] Furthermore, the distance from the top of the water receiving container to the bottom surface of the concrete specimen is 4.5% to 25% of the height of the concrete specimen.

[0022] Furthermore, the water receiving container has graduation lines.

[0023] Furthermore, the concrete specimen has dimensions of 200–400 mm × 50–150 mm × 50–150 mm; the crack width is 0.01–20 mm, preferably 0.1–10 mm.

[0024] Furthermore, the water injection pipe is cylindrical, with an inner diameter of 30–120 mm, a thickness of 2–20 mm, and a height of 50–150 mm.

[0025] Furthermore, the size of the clamping plate is larger than the size of the end face of the concrete specimen it contacts, with its length being 1.1 to 2 times the length of the end face and its height being 1.1 to 2 times the height of the end face.

[0026] Furthermore, the diameter of the water inlet is 1 / 5 to 1 / 20 of the diameter of the water injection pipe, and the diameter of the water outlet is 1 / 5 to 1 / 20 of the diameter of the water injection pipe.

[0027] Furthermore, the diameter of the inlet is 5-20 mm, and the diameter of the outlet is 5-20 mm.

[0028] Furthermore, the testing process for assessing the degree of crack repair using a testing device is as follows:

[0029] S1. The concrete specimen is clamped and fixed using the clamping plate;

[0030] S2. Install the water injection pipe on the upper surface of the crack in the concrete specimen;

[0031] S3. Inject water into the water injection pipe from the water inlet so that the water level is always at the water outlet;

[0032] S4. Collect the water flowing from the bottom of the crack using a water-collecting container and measure the time to obtain the initial water flow of the concrete specimen;

[0033] S5. Repair the cracks in the concrete specimen, measure the water flow rate of the repaired concrete specimen, and calculate the degree of crack repair in the concrete specimen.

[0034] Furthermore, the degree of crack repair is expressed by the reduction rate of water flow, which is calculated as: Reduction rate of water flow = (1 - Water flow after repair / Initial water flow) × 100%.

[0035] Furthermore, the flow rate indicates the mass of water received from the receiving container per minute.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] (1) This invention uses only water as a medium, without the need for chemical tracers or complex instruments, reducing the potential pollution risk to the environment and structure, and avoiding inaccurate testing caused by the leakage error of chemical tracers. It is simple to operate, low in cost, and has high measurement accuracy. It is not affected by external interference and can be portable and applied to various occasions to measure the degree of crack repair in waterproof and seepage-proof concrete.

[0038] (2) The water flux of this invention directly quantifies the seepage prevention capability after crack repair. By measuring the change in water flow before and after repair, the repair efficiency (such as the percentage reduction in flow) can be calculated, providing clear numerical indicators to facilitate comparison of the performance of different repair schemes or materials and reduce subjective judgment errors. It is especially suitable for water conservancy projects, underground structures, or waterproof facilities (such as dams, tunnels, basements, etc.). One of the core objectives of repair is to prevent leakage, and water flux testing can intuitively verify whether the repair materials or processes effectively reduce permeability.

[0039] (3) The detection device of the present invention can provide real-time feedback and dynamic monitoring. During the repair process, it can monitor the change of water flux in real time and effectively measure the change law of crack water flux over time, thereby effectively verifying the repair effect of crack repair material on crack and helping to adjust parameters such as grouting pressure and material dosage. After repair, it can also be tracked for a long time to evaluate the durability and the impact of environment (such as freeze-thaw and load) on the repair effect.

[0040] (4) The present invention can ensure a constant water source during the experiment by using the water inlet component, and always ensure constant water pressure, avoiding the need to add pressure measuring devices and solving the error in the comparison experiment of water flow caused by inconsistent water pressure. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the test device shown in Example 1 (without a water receiving container);

[0042] Figure 2 This is a schematic diagram of the test device shown in Example 1 (with a water receiving container).

[0043] Explanation of markings in the diagram:

[0044] 1-Concrete specimen;

[0045] 2-Clamping plate;

[0046] 3-Water injection assembly, 31-Water injection pipe, 32-Water inlet, 33-Water outlet;

[0047] 4-Water receiving container;

[0048] 5-Screw;

[0049] 6- Bolts;

[0050] 7-Inlet pipe, 71-Pressure pump, 72-Valve;

[0051] 8-Water outlet pipe. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. In the following embodiments or examples, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0053] It should be noted that in the description of this utility model, the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] Example 1

[0056] A testing device for repairing cracks in waterproof and seepage-resistant concrete, the testing device being used to test the degree of crack repair in concrete specimen 1, such as... Figure 1 and 2 As shown, the testing apparatus includes:

[0057] Two movable clamping plates 2 are used to clamp and fix both ends of the concrete specimen 1.

[0058] The water injection assembly 3, which is installed on the upper surface of the crack in the concrete specimen 1, includes a water injection pipe 31 located on the upper surface of the crack, an inlet 32 ​​and an outlet 33 located on the side of the water injection pipe 31, wherein the height of the outlet 33 is lower than the height of the inlet 32.

[0059] And a water-receiving container 4 is placed at the bottom of the crack in the concrete specimen 1 to collect water flowing out of the crack.

[0060] In this embodiment, the clamping plates 2 are located on both sides of the crack in the concrete specimen 1.

[0061] In this embodiment, the two clamping plates 2 are moved by a number of screws 5 passing through the two clamping plates 2.

[0062] In this embodiment, the clamping plate 2 has four threaded holes at its four corners for the screw 5 to pass through.

[0063] In this embodiment, a bolt 6 is provided through the screw 5 for clamping and fixing the concrete specimen 1 and the clamping plate 2.

[0064] In this embodiment, a sealing element is provided at the connection between the water injection pipe 31 and the concrete specimen 1 for sealing.

[0065] In this embodiment, an interface is provided at the bottom of the water injection pipe 31, and a gasket is placed on the concrete specimen 1. The interface and gasket are fixed with bolts, thereby installing the water injection pipe 31 on the upper surface of the concrete specimen 1. Silicone sealant is applied to the interface and the edges of the bolts to enhance sealing and waterproofing. This step uses conventional techniques in the art to connect and seal the water injection pipe 31 and the concrete specimen 1, avoiding testing errors.

[0066] In this embodiment, the diameter of the water injection pipe 31 is greater than the length and width of the crack.

[0067] In this embodiment, the water inlet 32 ​​is connected to the water inlet pipe 7, and the water inlet pipe 7 is equipped with a pressure pump 71 and a valve 72. The water inlet pipe 7 is connected to a water source, the valve 72 is used to switch the water source on and off, and the pressure pump 71 is used to control the size and flow rate of the water source. The water source is introduced into the water injection pipe 31 through the water inlet pipe 7; the water outlet 33 is connected to the water outlet pipe 8.

[0068] In this embodiment, the concrete specimen 1 has dimensions of 300mm × 100mm × 100mm. An artificial crack with a width of 0.3mm, a depth of 100mm, and a length of 60mm is located in the center of the upper surface of the specimen. The concrete specimen 1 comprises, by weight, 500 parts cement, 15 parts waterproofing agent, 650 parts manufactured sand, 645 parts river sand, and 240 parts water. It is waterproof and seepage-proof, and the raw materials are conventional materials selected in the art to ensure its waterproof and seepage-proof properties and avoid errors caused by water seepage in the concrete specimen 1 itself.

[0069] In this embodiment, the water injection pipe 31 is a polyvinyl chloride (PVC) round pipe with an inner diameter of 70 mm and a height of 120 mm. It is installed on the upper surface of the crack in the concrete specimen 1, completely covering the crack. The water outlet 33 is located 80 mm above the water injection pipe 31 to maintain a constant water pressure of 0.8 kPa with a water level difference of 80 mm. The water outlet 33 has an inner diameter of 10 mm. The water outlet 33 is connected to the water outlet pipe 8 to drain excess water. The water outlet pipe 8 is a flexible hose with a diameter of 10 mm and a length of 300 mm. The water inlet 32 ​​is located 30 mm above the water outlet 33. The water inlet 32 ​​has an inner diameter of 10 mm, and the water inlet pipe 32 is a flexible hose with a diameter of 10 mm.

[0070] In this embodiment, the clamping plate 2 is made of steel, with dimensions of 200mm × 200mm × 6mm, and the inner diameter of the threaded hole is 8mm. The screw 5 is made of steel, with a length of 700mm and a diameter of 8mm.

[0071] In this embodiment, the water receiving container 4 has graduations (not shown in the figure).

[0072] In this embodiment, the testing process for testing the degree of crack repair using a testing device is as follows:

[0073] S1. Rotate the bolt 6 to move the clamping plate 2 on the screw 5 and position it at both ends of the concrete specimen 1. Adjust the bolt 6 to clamp and fix the clamping plate 2 to the concrete specimen 1.

[0074] S2. An interface is set at the bottom of the water injection pipe 31, and a gasket is placed on the concrete specimen 1. The interface and gasket are fixed with bolts to install the water injection pipe 31 on the upper surface of the concrete specimen 1. Silicone sealant is applied to the interface and the edges of the bolts for further sealing to prevent water leakage. After installation, the specimen is placed in a 20°C environment and left to stand for 24 hours to allow the sealant on the sides and surface of the concrete specimen 1 to cure.

[0075] S3. After standing for 24 hours, conduct a water flow test. Open the pressure pump 71 and valve 72, and keep water flowing into the water injection pipe 31 through the water inlet pipe 7. Maintain the water level difference in the water injection pipe 31 at 80mm (water pressure about 0.8kPa). To maintain this water level difference, use the water outlet pipe 8, which is connected to the water outlet 33 at a distance of 80mm from the top of the concrete specimen 1, to drain excess water.

[0076] S4. The water in the water injection pipe 31 will flow down along the crack. When the water is observed to flow through the crack in the lower half of the concrete specimen 1 and water droplets are seen flowing out, time is 1 minute. Then, the water flowing out from the crack is collected in the water receiving container 4 and timed for 1 minute. Then, the mass of the water flowing out from the bottom of the specimen within 1 minute is measured and recorded to obtain the initial water flow of the concrete specimen 1. The measurement is repeated 3 times and the average value is taken.

[0077] S5. Measurements were taken on days 1, 3, 7, 14, 21, 28, 42, 49, and 56 after the initial water flow test of concrete specimen 1. The water flow of the repaired specimen was then calculated to determine the degree of crack repair. The degree of crack repair was expressed as the water flow reduction rate: Water flow reduction rate = (1 - Water flow after repair / Initial water flow) × 100%. After measurement, all concrete specimens were placed in water at 20°C for curing. They were removed before measurement and then placed back in water afterward to promote the formation of hydrates and facilitate crack repair.

[0078] S6. When the specimen stops dripping water, maintain an 80mm water level difference and observe for 8 hours. If no water droplets are found in the measuring cylinder below, conduct the same water flow test again the next day and observe for 24 hours. If no water seepage occurs, the specimen has stopped leaking, and the test is terminated.

[0079] This embodiment uses three concrete specimens (1) for testing. The test results on day 1, day 3, and day 7 are shown in Table 1 below.

[0080] Table 1. Results of Repair Degree of Concrete Specimens

[0081]

[0082] The water flux of this invention directly quantifies the seepage prevention capacity after crack repair. By measuring the change in water flow before and after repair, the repair efficiency (such as the percentage reduction in flow) can be calculated, providing a clear numerical indicator. This facilitates the comparison of the performance of different repair schemes or materials and reduces subjective judgment errors. During the repair process, changes in water flux can be monitored in real time, effectively measuring the change in crack water flow over time, thereby effectively verifying the repair effect of crack repair materials.

[0083] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A test device for repairing cracks in waterproof, impermeable concrete, characterized in that The test device is used for testing the crack repair degree of a concrete test piece (1), and comprises: Two clamping plates (2) movably clamping and fixing two ends of the concrete test piece (1); A water injection assembly (3) arranged on the upper surface of the crack of the concrete test piece (1) comprises a water injection pipe (31) located on the upper surface of the crack, a water inlet (32) and a water outlet (33) arranged on the side of the water injection pipe (31), and the height of the water outlet (33) is lower than that of the water inlet (32); And a water receiving container (4) arranged at the bottom of the crack of the concrete test piece (1) for receiving water flowing out of the crack.

2. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 1, characterized in that, The clamping plates (2) are respectively arranged on the two sides of the crack of the concrete test piece (1).

3. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 1, characterized in that, The two clamping plates (2) are moved by a plurality of screw rods (5) penetrating through the two clamping plates (2).

4. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 3, characterized in that A plurality of threaded holes for the screw rods (5) to penetrate through are arranged at four top corners of the clamping plate (2).

5. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 3, characterized in that, A bolt (6) for clamping and fixing the concrete test piece (1) and the clamping plate (2) is arranged through the screw rod (5).

6. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 1, characterized in that, A sealing member for sealing is arranged at the connection between the water injection pipe (31) and the concrete test piece (1).

7. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 1, characterized in that, The diameter of the water injection pipe (31) is greater than the length and width of the crack.

8. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 1, characterized in that, The water inlet (32) is connected with a water inlet pipe (7), the water inlet pipe (7) is provided with a pressure pump (71) and a valve (72); and the water outlet (33) is connected with a water outlet pipe (8).

9. A device for testing the repair of cracks in waterproof, impermeable concrete according to claim 1, characterized in that, The height of the water outlet (33) is 0.5-2 times the height of the concrete test piece (1).

10. The waterproof, impermeable concrete crack repair testing device of claim 1, wherein, The distance from the top of the water receiving container (4) to the bottom surface of the concrete test piece (1) is 4.5%-25% of the height of the concrete test piece (1).

Images