Method and device for testing the performance of a concrete waterproofing coating

Abstract

This invention discloses a method and apparatus for testing the performance of concrete waterproof coatings, belonging to the field of waterproof material performance testing technology. Based on the conventional water pressure penetration test principle, it improves and optimizes the sample testing mode and method. Specifically, the outer fixed cylinder, the testing cylinder, and the inner rotating cylinder are arranged coaxially to facilitate the placement of the ring-shaped sample inside the testing cylinder. Multiple sets of waterproof coatings on the sample correspond one-to-one with multiple testing chambers, providing simultaneous testing of multiple samples. A forward water pressure test is conducted first from the outside to the inside, followed by a reverse water pressure test from the inside to the outside. The testing process does not require sample replacement. Furthermore, it is important to emphasize that during the successive pressurization intervals of the forward and reverse water pressure tests, a heating plate is used to repeatedly dry the waterproof coating, simulating the repeated waterproofing environment of the waterproof coating in actual engineering, thus improving testing accuracy.

Description

Technical Field

[0001] This invention relates to the field of waterproof material performance testing technology, and more specifically, to a method and apparatus for testing the performance of concrete waterproof coatings. Background Technology

[0002] DPS Permanent Waterproofing Liquid is a water-based concrete waterproofing material containing proprietary catalysts and active chemicals. It can quickly and effectively react with calcium hydroxide, calcium aluminide, calcium silicate, etc. in the concrete structural layer to form inert crystals that embed into the capillaries of the concrete, sealing micro-cracks. This greatly enhances the density and compressive strength of the concrete surface. When the concrete is dry, the crystalline substances are dormant. When exposed to water, the crystals expand again and fill the capillaries of the concrete, preventing water penetration. This cycle can be repeated whenever water is encountered, thus waterproofing and sealing the concrete.

[0003] The permeability test of concrete waterproof coating is one of the important indicators for measuring the waterproof performance of materials. According to the search, CN109540760B discloses a test method for the permeability of polyurea coating materials. This test method can simulate the low temperature and humid environment in tunnels for the detailed structure of "polyurea coating material + construction joint", and realize the forward and reverse water pressure test.

[0004] However, during the forward test, the scenario of water seeping from the inside of the concrete to the surface of the coating is simulated. The pressure is increased step by step until the high-pressure water breaks through the polyurea coating. When the polyurea coating is broken, on the one hand, the specimen needs to be replaced in order to conduct an effective reverse water pressure test. Otherwise, the reverse test is performed on the damaged coating, which affects the test results and makes the process complicated. On the other hand, if the forward and reverse tests are not performed on the same specimen at the same time, the accuracy of the test will also be affected.

[0005] Furthermore, in actual use, concrete waterproof coatings are subjected to repeated waterproofing environments, meaning they undergo repeated cycles of water exposure and drying. This solution fails to simulate the water pressure resistance of the waterproof coating under these repeated water exposure and drying cycles. Summary of the Invention

[0006] The purpose of this invention is to solve the existing problems and provide a method and apparatus for testing the performance of concrete waterproof coatings compared with the prior art.

[0007] The objective of this invention can be achieved through the following technical solution: a concrete waterproof coating performance testing device, comprising an outer fixed cylinder and a testing cylinder coaxially fixedly installed on a testing platform, an inner rotating cylinder installed inside the testing cylinder, and a placement cavity for placing the sample between the inner rotating cylinder and the testing cylinder, the sample being surrounded by a waterproof coating coated on the outside of the crack, and a plurality of testing cavities corresponding to the positions of the waterproof coating and open at the top being circumferentially opened on the end wall of the testing cylinder.

[0008] The inner wall of the outer fixed cylinder is equipped with multiple external water inlet spray components corresponding to the positions of the detection chambers via a rotating structure. A heating plate is installed on one side of each external water inlet spray component. Multiple detection layers corresponding to the positions of the detection chambers are embedded in the end wall of the inner rotating cylinder. An internal water inlet spray component is installed inside the inner rotating cylinder. Spray slots corresponding to the positions of the internal water inlet spray components are opened on the end wall of the inner rotating cylinder.

[0009] Furthermore, the sample is a cylindrical concrete sample structure composed of multiple fan-shaped concrete blocks joined end to end, with cracks formed between adjacent concrete blocks. A waterproof coating is applied to the outer ring gap between adjacent concrete blocks, and a sealing plate is embedded in the top of the test cylinder to seal the upper part of the sample.

[0010] Furthermore, the rotating structure includes a pair of rotating gear sleeves rotatably mounted on the upper and lower inner walls of the outer fixed cylinder and used to fix the external water inlet spray assembly. External gears that mesh with the pair of rotating gear sleeves are rotatably mounted on the outer side of the outer fixed cylinder in the up and down direction. A drive motor for rotating the external gears is fixedly mounted at the lower end of the testing platform.

[0011] Furthermore, the external water inlet spray assembly includes an external spray box fixed between a pair of rotating gear sleeves. The external spray box has a slot with openings facing downwards and towards the detection chamber. A vertically arranged external spray pipe is inserted into the slot. Multiple external nozzles are distributed on the end wall of the external spray pipe located in the slot, which are perpendicular to the detection chamber.

[0012] Furthermore, the internal water injection assembly includes an internal injection cylinder fixedly inserted into the inner side of the internal rotating cylinder. The outer end wall of the internal injection cylinder has a plurality of injection channels that are staggered with the detection cavity and movably sealed to the inner wall of the internal rotating cylinder. An internal injection pipe is inserted inside the internal injection cylinder. The internal injection pipe has a plurality of internal injection nozzles that penetrate to the inside of the injection channels on the inner end wall of the internal injection cylinder.

[0013] Furthermore, the lower end of the heating plate is fixedly connected to a detection box that is movably and sealingly fitted to the outer wall of the lower end of the detection cylinder. The bottom end of the detection box is connected to a drain pipe, and a humidity sensor is installed inside the detection box.

[0014] This invention also proposes a method for testing the performance of concrete waterproof coatings, comprising the following steps:

[0015] S1. Sample pretreatment: Apply waterproof material to the vertical joint crack between two adjacent concrete blocks to form a waterproof coating, place the sample in the test tube, and cover it with a sealing plate.

[0016] S2. Positive water pressure test: Open the water source in the external spray pipe, pressurize upwards with a gradient of 1MPa as the initial pressurization value, and spray the pressurized water vertically onto the waterproof coating through multiple external nozzles to simulate the scenario of water penetrating from the surface of the coating into the concrete in actual engineering.

[0017] During the intervals between pressurizations, the heating plate is rotated to the outside of the waterproof coating to dry it, simulating the repeated waterproofing environment of the waterproof coating in actual engineering. The test layer is then inspected using a test camera to determine whether the waterproof coating meets the requirements of the positive pressure test.

[0018] S3. Reverse water pressure test: Rotate the test box to the outside of the crack. At the same time, rotate the inner rotating cylinder so that multiple sets of spray nozzles correspond one by one with the inside of the crack. Open the water source in the inner spray pipe and pressurize upwards in a gradient manner with 1MPa as the initial pressure value. Spray water into the crack to simulate the scenario of water flowing from the inside crack of concrete to the surface of the coating in actual engineering. This process will eliminate waterproof coatings that have failed the penetration test during the forward water pressure test.

[0019] During the intervals between pressurization, the heating plate is activated to dry the waterproof coating, simulating the repeated waterproofing environment of the waterproof coating in actual engineering. The detection box located below the heating plate, in conjunction with the humidity sensor, is used to detect whether there is reverse permeation in the waterproof coating and to determine whether the waterproof coating meets the reverse pressure test requirements.

[0020] Compared with the prior art, the advantages of this invention are:

[0021] 1. This solution is based on the conventional water pressure penetration test principle and improves and optimizes the sample testing mode and method. Specifically, by setting the coaxial positions of the outer fixed cylinder, the testing cylinder and the inner rotating cylinder, it is convenient to place the sample forming the ring structure inside the testing cylinder. Multiple sets of waterproof coatings on the sample correspond one-to-one with multiple testing chambers, providing multiple samples to be tested in the same group. The solution adopts a forward water pressure test from the outside to the inside and a reverse water pressure test from the inside to the outside. On the one hand, there is no need to change the sample during the test. On the other hand, after the forward test, the reverse test is performed on the qualified waterproof coating, which can better reflect the waterproof performance of the waterproof coating under the complex real-world use conditions, thereby improving the accuracy of the performance test.

[0022] 2. This solution adds a heating plate to one side of each external spray box. During the pressurization intervals of the forward and reverse water pressure tests, the waterproof coating is repeatedly dried by the heating plate. That is, after each pressurization test, the waterproof coating is dried by the heating plate to restore it to its natural state, and then pressurization is performed again. This cycle is repeated to simulate the repeated waterproofing environment of the waterproof coating in actual engineering, thereby improving the accuracy of the test. In addition, a high-temperature environment can be provided during the forward and reverse pressure test to detect whether the waterproof coating is affected by high temperature during the waterproofing process, and to more directly reflect the actual use of the coating's waterproof performance. Attached Figure Description

[0023] Figure 1 This is a top view of the present invention;

[0024] Figure 2 This is a bottom view of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the sample before it is placed into the detection cylinder according to the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the present invention when the sample is placed in the detection cylinder and then sealed.

[0027] Figure 5 This is a schematic diagram of the structure of the detection cylinder and the outer fixing cylinder when they are separated.

[0028] Figure 6 This is a top view of the present invention after the sample has been placed in the detection cylinder;

[0029] Figure 7 This is a schematic diagram of the structure at the junction of the multiple sets of external water inlet jet components and the rotating structure of the present invention;

[0030] Figure 8 This is a cross-sectional view of the junction between the detection cylinder and the inner rotating cylinder of the present invention;

[0031] Figure 9 This is a cross-sectional view of the internal water inlet jet assembly of the present invention;

[0032] Figure 10 This is a partial cross-sectional view of the present invention during a positive hydrostatic test;

[0033] Figure 11 This is an overall cross-sectional view of the present invention during a positive hydrostatic test;

[0034] Figure 12 This is a schematic diagram showing the result of rotating the heating plate to the outside of the waterproof coating for heating according to the present invention;

[0035] Figure 13 This is a schematic diagram of the structure of the present invention during reverse water pressure testing.

[0036] Explanation of the labels in the diagram:

[0037] 1. Outer fixed cylinder; 2. Detection cylinder; 201. Detection chamber; 3. Inner rotating cylinder; 301. Spraying slot; 4. Sample; 401. Crack; 402. Waterproof coating; 5. Sealing plate; 6. Rotating gear sleeve; 7. Outer spray box; 8. Outer spray pipe; 801. Outer nozzle; 9. Heating plate; 10. Detection box; 11. Humidity sensor; 12. Detection layer; 13. Detection camera; 14. Inner spray cylinder; 15. Spraying channel; 16. Inner spray pipe; 161. Inner spray nozzle. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Example 1: To address the issue of needing to replace specimens during forward and reverse water pressure tests, the test method was optimized. Furthermore, to address the problem that conventional test environments fail to simulate the repeated water exposure and drying cycles of the waterproof coating, leading to inaccurate water pressure resistance test results, the following technical solution is proposed:

[0040] This invention discloses a testing device for the performance of concrete waterproof coatings. Please refer to [link / reference]. Figure 1 , Figure 2 The test tube includes an outer fixed cylinder 1 and a test cylinder 2, which are coaxially fixedly installed on the test platform. The lower ends of the outer fixed cylinder 1 and the test cylinder 2 extend to the bottom of the test platform. An inner rotating cylinder 3 is installed inside the test cylinder 2. The inner rotating cylinder 3 and the test cylinder 2 form a placement cavity for placing the sample 4. The sample 4 is a cylindrical concrete sample structure composed of multiple fan-shaped concrete blocks joined end to end. A crack 401 is formed between two adjacent concrete blocks. A waterproof coating 402 is applied to the outer ring gap where two adjacent concrete blocks are joined. Multiple test cavities 201 with open upper ends are circumferentially opened on the end wall of the test cylinder 2, corresponding to the position of the waterproof coating 402.

[0041] Please see Figure 3 , Figure 4A concrete block capable of simulating standard on-site construction processes is selected and made into a fan-shaped structure. Multiple fan-shaped concrete blocks are spliced ​​together to form a ring structure. Waterproof material is applied to the vertical joint cracks between two adjacent concrete blocks and cured to form a waterproof coating 402, thus forming a ring-shaped overall structure of the sample 4. Multiple waterproof coatings 402 are formed on the outer ring surface. The pretreated sample 4 is placed inside the test cylinder 2, and the waterproof coating 402 corresponds exactly to the test cavity 201.

[0042] The top of the test cylinder 2 is fitted with a sealing plate 5 that seals the upper part of the sample 4. Both the sealing plate 5 and the sample 4 have slots for easy handling. The bottom of the sealing plate 5 has a mating block that engages with the slot on the sample 4. After the sample 4 to be tested is placed in the placement cavity, the sealing plate 5 is placed on the sample 4. The periphery of the sealing plate 5 is engaged with multiple test cavities 201, which seals the crack 401 formed on the upper part of the sample 4.

[0043] Please see Figures 4-9 The inner wall of the outer fixed cylinder 1 is equipped with a plurality of external water inlet spray components that are corresponding to the positions of the detection chamber 201 through a rotating structure. The rotating structure includes a pair of rotating toothed sleeves 6 that are rotatably installed on the upper and lower inner walls of the outer fixed cylinder 1 and used to fix the external water inlet spray components. External gears that mesh with the pair of rotating toothed sleeves 6 are rotatably installed on the outer side of the outer fixed cylinder 1 in the up and down direction. A drive motor for rotating the external gears is fixedly installed at the lower end of the detection table.

[0044] The external water inlet jet assembly includes an external jet box 7 fixed between a pair of rotating gear sleeves 6. The external jet box 7 has a slot with an opening facing downward and towards the detection chamber 201. A vertically arranged external jet pipe 8 is inserted into the slot. Multiple external nozzles 801 that are perpendicular to the detection chamber 201 are distributed on the end wall of the external jet pipe 8 located in the slot.

[0045] Multiple detection layers 12 corresponding to the positions of detection chamber 201 are embedded on the end wall of the inner rotating cylinder 3. A detection camera 13 is fixedly installed at the top of the inner rotating cylinder 3. An inner water inlet jet assembly is also fixedly installed inside the inner rotating cylinder 3, which is distributed at intervals and staggered with the positions of the detection layers 12. A jet slot 301 corresponding to the position of the inner water inlet jet assembly is opened on the end wall of the inner rotating cylinder 3. The lower end of the inner rotating cylinder 3 is rotatably installed on the bottom wall of the detection cylinder 2 through a connecting shaft. A second drive motor that drives the connecting shaft to rotate is fixedly installed on the bottom end wall of the detection cylinder 2. A drive gear that meshes with each other is fixedly installed on the drive end of the second drive motor and on the connecting shaft.

[0046] The internal water injection assembly includes an internal injection cylinder 14 fixedly inserted inside the inner rotating cylinder 3. Multiple injection channels 15 are arranged in a ring on the outer end wall of the internal injection cylinder 14, which are staggered with the detection chamber 201 and are movably sealed to the inner wall of the inner rotating cylinder 3. An internal injection pipe 16 is inserted inside the internal injection cylinder 14. Multiple internal injection nozzles 161 are distributed on the inner end wall of the internal injection cylinder 14, which penetrate to the inside of the injection channels 15.

[0047] Please see Figure 7 A heating plate 9 is installed on one side of the external water inlet spray assembly. The lower end of the heating plate 9 is fixedly connected to a detection box 10 that is movably and sealingly fitted to the lower outer wall of the detection cylinder 2. A drain pipe is connected to the bottom of the detection box 10, and a humidity sensor 11 is installed inside the detection box 10.

[0048] The basic principles include: Please refer to: Figure 1 , Figure 3 After placing sample 4 into the placement cavity inside detection cylinder 2, its upper end is sealed and covered using sealing plate 5. Please refer to [link / reference]. Figure 10 , Figure 11 During the positive pressure test, multiple sets of external spray boxes 7 are used to pressurize the detection chamber 201 one by one to simulate the scenario of water flowing from the coating surface to the concrete interior in actual engineering. The detection layer 12 located on the other side of the crack is used in conjunction with the detection camera 13 to detect whether there is a positive penetration phenomenon in the waterproof coating 402.

[0049] During the reverse pressure test, please refer to Figure 12 , Figure 13 Rotate the inner rotating cylinder 3 so that multiple spray slots 301 correspond one-to-one with the positions of the cracks 401 on the inner side of the sample 4. At this time, the internal water inlet spray assembly is used to spray the cracks 401 to simulate the scenario of water flow from the cracks inside the concrete to the surface of the coating in actual engineering. This process eliminates the waterproof coating 402 that has failed the penetration test during the positive water pressure test.

[0050] Throughout the testing process, given the simultaneous testing of multiple sets of waterproof coating 402, the detection contrast is improved on the one hand, and on the other hand, the positive pressure test from the outside to the inside is carried out first, followed by the reverse pressure test from the inside to the outside. The test process does not require replacement of the sample due to severe damage, thus simplifying the testing procedure.

[0051] During the successive pressurization intervals of the positive and negative water pressure tests, the waterproof coating 402 is repeatedly dried by the heating plate 9 to simulate the repeated waterproofing environment of the waterproof coating in actual engineering, thereby improving the accuracy of the test.

[0052] Example 2: Based on the testing apparatus of Example 1, a method for testing the performance of concrete waterproof coatings is proposed. Please refer to [link / reference]. Figures 10-13 This includes the following steps:

[0053] S1. Sample pretreatment: Apply waterproof material to the vertical joint crack of two adjacent concrete blocks and cure it. Multiple waterproof coatings 402 are formed on the outer side of the sample 4, which forms a ring-shaped integral structure. Place the sample 4 in the test tube 2 and cover it with the sealing plate 5.

[0054] S2. Positive water pressure test: In the initial state, multiple external spray boxes 7 correspond one-to-one with multiple detection chambers 201. The water source is opened by opening the external spray pipe 8. The pressure is increased upward in a gradient with 1MPa as the initial pressure value. The pressurized water flow is vertically sprayed onto the waterproof coating 402 through multiple external nozzles 801 to simulate the scenario of water flow penetrating from the surface of the coating into the concrete in actual engineering.

[0055] During the intervals between pressurizations, the heating plate 9 is rotated to the outside of the waterproof coating 402 to dry it, simulating the repeated waterproofing environment of the waterproof coating in actual engineering. The detection layer 12 on the other side of the crack cooperates with the detection camera 13 to detect whether there is a positive penetration phenomenon in the waterproof coating 402. When the detection camera 13 detects that the detection layer 12 is penetrated and wetted, it indicates that the waterproof coating 402 has a penetration phenomenon under a certain spray pressure. Conversely, it indicates that the waterproof coating 402 has no penetration phenomenon under the preset maximum pressure.

[0056] S3, Reverse water pressure test: Multiple test boxes 10 are rotated synchronously to the outside of the waterproof coating 201. At the same time, the inner rotating cylinder 3 is rotated to make multiple spray nozzles 301 correspond one-to-one with the inside of the crack 401. The water source is opened in the inner spray pipe 16. The pressure is increased upward in a gradient with 1MPa as the initial pressure value. The pressurized water is sprayed vertically through multiple inner spray nozzles 161. The water is sprayed into the crack 401 through the spray channel 15 and the spray nozzles 301 to simulate the scenario of water penetrating from the crack inside the concrete to the surface of the coating in actual engineering.

[0057] During the intervals between pressurization, the heating plate 9 is activated to dry the waterproof coating 402, simulating the repeated waterproofing environment of the waterproof coating in actual engineering. The detection box 10 located below the heating plate 9, in conjunction with the humidity sensor 11, is used to detect whether there is reverse permeation in the waterproof coating 402. When the humidity sensor 11 detects humidity, it indicates that the waterproof coating 402 has permeated or been ruptured under a certain spray pressure. Conversely, it indicates that the waterproof coating 402 has not permeated even when pressurized to the preset maximum pressure.

[0058] This testing method employs a forward pressure test from the outside in and a reverse pressure test from the inside out, replacing the conventional testing procedures in the background technology.

[0059] First, a positive water pressure test is conducted, which is a test of water supply from the outside to the inside. During the positive water pressure test, the heating plate 9 is activated to dry the waterproof coating 402 during the intervals between pressurization, simulating the repeated waterproofing environment of the waterproof coating in actual engineering.

[0060] The detection layer 12 located on the other side of the crack, in conjunction with the detection camera 13, is used to detect whether there is a positive penetration phenomenon in the waterproof coating 402. The detection layer 12 is made of a water-absorbing material, and a highly absorbent water-absorbing material can be selected according to actual needs, such as a sheet structure made of hydrogel, which quickly swells and changes its shape when it comes into contact with water. When the detection camera 13 detects that the detection layer 12 is penetrated and wetted, it indicates that the waterproof coating 402 has a penetration phenomenon under a certain spray pressure. In addition, a hydrogel sensor can be set on the inner side of the detection layer 12 to replace the visual detection of the detection camera 13. The detection of this penetration phenomenon can be selected according to actual needs. Conversely, if the waterproof coating 402 does not show any penetration phenomenon after each pressurization, it indicates that the waterproof coating 402 can resist the positive water pressure test under the preset maximum pressure, and it is a qualified coating.

[0061] The positive pressure test, which is performed from the outside to the outside, can test the water barrier ability of the waterproof coating 402 and its sealing performance with the concrete substrate. If the waterproof coating 402 can effectively prevent water penetration under positive water pressure, it indicates that the coating has good performance in normal waterproofing. Setting up multiple sets of waterproof coatings 402 allows for simultaneous pressure testing to improve the accuracy of the test.

[0062] After the positive water pressure test is completed, the waterproof coating 402 in many places can resist the positive water pressure test. If a few waterproof coatings 402 show signs of penetration, the test object will be removed in the subsequent reverse water pressure test.

[0063] During the reverse water pressure test, which is a water supply test from the inside to the outside, the waterproof coating 402 that has passed the forward water pressure test from the outside to the inside is subjected to a subsequent reverse test. In this process, multiple test boxes 10 are rotated synchronously to the bottom of multiple test chambers 201, while the inner rotating cylinder 3 is rotated to align multiple spray channels 15 with the inner side of the crack 401 for the reverse water pressure test. During the intervals between each pressurization, the heating plate 9 is activated to dry the waterproof coating 402, simulating the repeated waterproofing environment of the waterproof coating in actual engineering.

[0064] During the successive compression reverse test, the detection box 10 and the humidity sensor 11 are used to detect the reverse pressure resistance of the waterproof coating 402. When the humidity sensor 11 inside the detection box 10 detects humidity, it indicates that the waterproof coating 402 has a reverse permeation phenomenon under a certain spray pressure. Conversely, if the waterproof coating 402 does not permeate after each pressurization, it indicates that the waterproof coating 402 can resist the reverse water pressure test when pressurized to the preset maximum pressure, and it passes the forward and reverse bidirectional detection.

[0065] This test is of great significance for evaluating the bond strength between the coating and concrete and whether there are defects in the coating itself. When reverse water pressure is applied, if the bond strength between the coating and concrete is insufficient, or if the coating itself has defects such as cracks or holes, water may seep out from these weak points, thus reflecting the coating's performance in preventing reverse water penetration.

[0066] In summary: Based on the conventional water pressure penetration test principle, the sample testing mode and method are improved and optimized. Specifically, by setting the coaxial positions of the outer fixed cylinder 1, the testing cylinder 2 and the inner rotating cylinder 3, it is convenient to place the sample 4, which forms a ring structure, into the testing cylinder 2. The multiple sets of waterproof coatings 402 on the sample 4 correspond one-to-one with multiple testing chambers 201, providing multiple samples to be tested in the same group. The test adopts a forward water pressure test from the outside to the inside and a reverse water pressure test from the inside to the outside. The test process does not require the sample to be replaced.

[0067] Furthermore, it should be emphasized that during the successive pressurization intervals of the forward and reverse water pressure tests, the waterproof coating 402 is repeatedly dried by the heating plate 9, simulating the repeated waterproofing environment of the waterproof coating in actual engineering, thereby improving the accuracy of the test. The heating plate 9 can also provide a high-temperature environment during the forward and reverse pressure test, allowing the test to detect whether the waterproof coating is affected by high temperature during the waterproofing process, and more directly reflecting the actual use of the coating's waterproof performance.

[0068] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A concrete waterproof coating performance testing device, comprising an outer fixing cylinder (1) and a testing cylinder (2) coaxially fixedly mounted on a testing platform, characterized in that: The inner rotating cylinder (3) is installed inside the detection cylinder (2) and the inner rotating cylinder (3) and the detection cylinder (2) form a placement cavity for placing the sample (4). The sample (4) is surrounded by a waterproof coating applied to the outside of the crack (401). Multiple detection cavities (201) are circumferentially opened on the end wall of the detection cylinder (2) and are corresponding to the positions of the waterproof coating (402) and open at the top. The inner wall of the outer fixed cylinder (1) is equipped with multiple external water inlet spray components that correspond to the positions of the detection chamber (201) through a rotating structure ring drive. A heating plate (9) is installed on one side of the external water inlet spray components. Multiple detection layers (12) corresponding to the positions of the detection chamber (201) are embedded on the end wall of the inner rotating cylinder (3). An internal water inlet spray component is installed inside the inner rotating cylinder (3). A spray slot (301) corresponding to the position of the internal water inlet spray component is opened on the end wall of the inner rotating cylinder (3). The sample (4) is a cylindrical concrete sample structure consisting of multiple fan-shaped concrete blocks joined end to end. A crack (401) is formed between two adjacent concrete blocks. A waterproof coating (402) is applied to the outer ring gap where the two adjacent concrete blocks are joined. A sealing plate (5) is installed on the top of the test cylinder (2) and sealed to the upper part of the sample (4). The rotating structure includes a pair of rotating toothed sleeves (6) rotatably mounted on the upper and lower inner walls of the outer fixed cylinder (1) and used to fix the external water inlet spray assembly. The outer fixed cylinder (1) is rotatably mounted in the upper and lower directions with external gears that mesh with the pair of rotating toothed sleeves (6) respectively. A drive motor for driving the external gears is fixedly mounted at the lower end of the test platform. The external water injection assembly includes an external injection box (7) fixed between a pair of rotating toothed sleeves (6). The external injection box (7) is provided with a vertically arranged external injection pipe (8). Multiple external nozzles (801) are distributed on the end wall of the external injection pipe (8) located in the empty slot, which are perpendicular to the detection chamber (201). The internal water injection assembly includes an internal injection cylinder (14) fixedly inserted inside the internal rotating cylinder (3). Multiple injection channels (15) are arranged in a ring on the outer end wall of the internal injection cylinder (14) and are interposed with the detection chamber (201). An internal injection pipe (16) is inserted inside the internal injection cylinder (14). The internal injection pipe (16) has multiple injection nozzles (161) facing the injection channels (15).

2. The concrete waterproof coating performance testing device according to claim 1, characterized in that: The heating plate (9) is fixedly connected to a detection box (10) that is movably and sealed to the outer wall of the lower end of the detection cylinder (2), and a humidity sensor (11) is installed inside the detection box (10).

3. A method for testing the performance of a concrete waterproof coating, using the concrete waterproof coating performance testing device as described in any one of claims 1-2, characterized in that, Includes the following steps: S1. Sample pretreatment: Apply waterproof material to the vertical joint crack of two adjacent concrete blocks to form a waterproof coating (402), place the sample (4) in the test tube (2), and cover it with a sealing plate (5). S2, Positive water pressure test: Open the water source of the external spray pipe (8), pressurize upward with a gradient increase of 1MPa as the initial pressurization value, and spray the pressurized water vertically onto the waterproof coating (402) to simulate the scenario of water flow penetrating from the surface of the coating into the concrete in actual engineering. During the interval between pressurizations, the heating plate (9) is rotated to the outside of the waterproof coating (402) and dried to simulate the repeated waterproofing environment of the waterproof coating in actual engineering. The detection camera (13) is used to detect the detection layer (12) to determine whether the waterproof coating (402) meets the positive pressure test requirements. S3, Reverse water pressure test: Rotate the test box (10) to the outside of the test chamber (201), and at the same time, rotate the inner rotating cylinder (3) so that multiple sets of spray slots (301) correspond one by one with the inside of the crack (401). Open the water source of the inner spray pipe (16), and pressurize upwards in a gradient manner with 1MPa as the initial pressure value, and spray water into the crack (401) to simulate the scenario of water flow from the crack inside the concrete to the surface of the coating in actual engineering. In this process, the waterproof coating (402) that has failed the penetration test during the forward water pressure test is eliminated. During the interval between pressurizations, the heating plate (9) is activated to dry the waterproof coating (402), simulating the repeated waterproofing environment of the waterproof coating in actual engineering. The detection box (10) located below the heating plate (9) and the humidity sensor (11) are used to detect whether there is reverse permeation in the waterproof coating (402) and to determine whether the waterproof coating (402) meets the reverse pressure test requirements.

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