Method and device for testing performance of concrete waterproof coating

Abstract

The invention discloses a concrete waterproof coating performance testing method and device, belongs to the technical field of waterproof material performance detection, and aims to improve and optimize a sample detection mode and a detection method based on a conventional water pressure penetration testing principle. Samples forming an annular structure can be conveniently placed in a detection cylinder, multiple groups of waterproof coatings on the samples correspond to multiple detection cavities in a one-to-one mode, multiple samples can be detected in the same group, forward water pressure testing from outside to inside and then reverse water pressure testing from inside to outside are adopted, and the samples do not need to be replaced in the testing process; in the successive pressurization gap of the positive and negative water pressure test, the waterproof coating is repeatedly dried through the heating plate, the repeated waterproof environment of the waterproof coating in the actual engineering is simulated, and the detection accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof material performance detection, and more specifically, to a method and device for testing the performance of a concrete waterproof coating. Background Art

[0002] DPS permanent setting liquid is a water-based concrete waterproof material containing proprietary catalysts and active chemicals. It can quickly and effectively react with calcium hydroxide, calcium aluminate, calcium silicate, etc. in the concrete structural layer to form inert crystals that embed in the capillary pores of the concrete, sealing fine cracks, thereby greatly enhancing the density and compressive strength of the concrete surface layer. In the dry state of the concrete, the crystalline substances are dormant. When exposed to water, the crystals expand again to fill the capillary pores of the concrete, blocking the infiltration of water. This cycle can be repeated as long as there is water, providing waterproof sealing for the concrete.

[0003] The detection of the permeability of a concrete waterproof coating is one of the important indicators for measuring the waterproof performance of materials. After retrieval, the patent with publication number CN109540760B discloses a method for testing the penetration performance of a polyurea coating material. This testing method can simulate the low-temperature and humid environmental characteristics in a tunnel for the detailed structure of "polyurea coating material + construction joint" and achieve forward and reverse water pressure tests.

[0004] However, during the forward test, simulating the scenario where water seeps out from the inside of the concrete to the surface of the coating, the pressure is gradually increased until high-pressure water breaks through the polyurea coating. When the polyurea coating is broken, on the one hand, it is necessary to replace the specimen to conduct an effective reverse water pressure test. Otherwise, conducting a reverse test on the damaged coating will affect the test results and lead to cumbersome process operations. On the other hand, when replacing the specimen, if the forward and reverse two-way tests do not act on the same specimen simultaneously, it will also affect the test accuracy.

[0005] In addition, during the actual use of the concrete waterproof coating, it is in a repeated waterproof environment, that is, the waterproof coating experiences a cycle of repeated water exposure and drying. This solution fails to simulate the water pressure resistance performance of the waterproof coating in the cycle of repeated water exposure and drying. Summary of the Invention

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

[0007] The object of the present invention can be achieved by the following technical solutions: A performance testing device for a concrete waterproof coating, comprising an outer fixed cylinder and a testing cylinder which are fixedly installed coaxially inside and outside on a testing table. An inner rotating cylinder is rotatably driven and installed inside the testing cylinder. A placement cavity for placing a specimen is formed between the inner rotating cylinder and the testing cylinder. A waterproof coating is applied around the specimen and on the outside of the crack. A plurality of testing cavities which are annularly arranged on the end wall of the testing cylinder and correspond to the position of the waterproof coating and have upper openings are provided.

[0008] On the inner side wall of the outer fixed cylinder, a plurality of outer water inlet spraying components corresponding to the positions of the testing cavities are annularly driven and installed through a rotating structure. A heating plate is installed on one side of the outer water inlet spraying component. On the end wall of the inner rotating cylinder, a plurality of testing layers corresponding to the positions of the testing cavities are embedded and installed. And an inner water inlet spraying component is installed inside the inner rotating cylinder. A spraying notch corresponding to the position of the inner water inlet spraying component is opened on the end wall of the inner rotating cylinder.

[0009] Further, the specimen is a cylindrical concrete specimen structure formed by butt-jointing a plurality of sector-shaped concrete blocks end to end. A crack is formed between adjacent two concrete blocks. The waterproof coating is applied to the outer ring gap where adjacent two concrete blocks are butted. A sealing plate which seals the upper part of the specimen is embedded and installed at the top of the testing cylinder.

[0010] Further, the rotating structure includes a pair of rotating tooth sleeves which are rotatably installed on the upper and lower inner walls of the outer fixed cylinder and are used for fixing the outer water inlet spraying component. An outer gear which meshes and connects with the pair of rotating tooth sleeves respectively is rotatably installed in the up and down direction on the outside of the outer fixed cylinder. And a driving motor I for rotating and driving the outer gear is fixedly installed at the lower end of the testing table.

[0011] Further, the outer water inlet spraying component includes an outer spraying box fixed between the pair of rotating tooth sleeves. An empty slot which opens downward and toward one side of the testing cavity is opened inside the outer spraying box. A vertically arranged outer spraying pipe is inserted into the empty slot. A plurality of outer nozzles which are vertically arranged corresponding to the testing cavity are distributed on the end wall of the outer spraying pipe located in the empty slot.

[0012] Further, the inner water inlet spraying component includes an inner spraying cylinder fixedly inserted inside the inner rotating cylinder. A plurality of spraying channels which are annularly distributed on the outer end wall of the inner spraying cylinder and are staggered with the testing cavities and are movably and sealingly attached to the inner wall of the inner rotating cylinder are provided. An inner spraying pipe penetrates through the inside of the inner spraying cylinder. A plurality of inner nozzles which penetrate to the inside of the spraying channels are distributed on the inner side end wall of the inner spraying pipe located inside the inner spraying cylinder.

[0013] Further, the lower end of the heating plate is fixedly connected with a testing box which is movably and sealingly attached to the outer wall of the lower end of the testing cylinder. A drain pipe is externally connected to the bottom end of the testing box. And a humidity sensor is installed inside the testing box.

[0014] The present invention also provides a method for testing the performance of a concrete waterproof coating, which includes the following steps:

[0015] S1. Specimen pretreatment: Apply a waterproof material to the vertical butt joint cracks of two adjacent concrete blocks to form a waterproof coating, place the specimen in a detection cylinder, and cover it with a sealing plate;

[0016] S2. Forward water pressure test: Open the water source of the outer spray pipe, start pressurizing upward with a gradient increase starting from 1 MPa, and the pressurized water flow is vertically sprayed on the waterproof coating through multiple outer nozzles to simulate the scenario of water seeping from the coating surface into the concrete in actual engineering;

[0017] During the intermittent pressurization, rotate the heating plate to the outside of the waterproof coating to dry it, simulate the repeated waterproof environment of the waterproof coating in actual engineering, use a detection camera to detect the detection layer, and judge whether the waterproof coating meets the forward pressure test requirements;

[0018] S3. Reverse water pressure test: Rotate the detection box to the outside of the crack. At the same time, rotate the driving inner rotating cylinder so that multiple groups of spray slots correspond to the inside of the crack one by one. Open the water source of the inner spray pipe, and also start pressurizing upward with a gradient increase starting from 1 MPa to spray water into the crack, simulating the scenario of water seeping from the internal crack of the concrete to the coating surface in actual engineering. During this process, eliminate the waterproof coatings that have failed in the forward water pressure test;

[0019] During the intermittent pressurization, start the heating plate to dry the waterproof coating, simulate the repeated waterproof environment of the waterproof coating in actual engineering, and the cooperation between the detection box and the humidity sensor below the heating plate is used to detect whether there is reverse penetration in the waterproof coating and judge whether the waterproof coating meets the reverse pressure test requirements.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] 1. This solution is based on the conventional water pressure penetration test principle, improves and optimizes the specimen detection mode and detection method. Specifically, through the coaxial setting of the outer fixed cylinder, detection cylinder and inner rotating cylinder, it is convenient to place the specimen forming an annular structure in the detection cylinder. Multiple groups of waterproof coatings on the specimen correspond to multiple detection cavities respectively, providing multi-specimen same-group detection. And it adopts the forward water pressure test from outside to inside first and then the reverse water pressure test from inside to outside. On the one hand, there is no need to replace the specimen during the test process. On the other hand, after the forward test, the reverse test is carried out for the qualified waterproof coatings, which can better reflect the waterproof performance of the waterproof coating under the realistic and complex usage conditions, so as to improve the accuracy of performance testing;

[0022] 2. In this solution, a heating plate is added to each side of the outer spraying box. During the intermittent pressurization process of the positive and negative water pressure tests, the waterproof coating is repeatedly dried by the heating plate. That is, after a pressurization test is completed, the heating plate is used to dry the waterproof coating to restore its natural state, and then another pressurization is carried out. This cycle simulates the repeated waterproof environment of the waterproof coating in the actual project and improves the detection accuracy. In addition, during the positive and negative pressure test detections, a high-temperature environment can be provided to detect whether the waterproof coating is affected by high temperature during the waterproof process, more directly reflecting the actual use situation of the coating's waterproof performance. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0025] Figure 3 is a schematic structural diagram of the present invention before the sample is placed in the detection cylinder;

[0026] Figure 4 is a schematic structural diagram of the present invention when the sample is placed in the detection cylinder and sealed;

[0027] Figure 5 is a schematic structural diagram of the present invention when the detection cylinder is detached from the outer fixing cylinder;

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

[0029] Figure 7 is a schematic structural diagram of the combination of multiple groups of outer water inlet spraying components and the rotating structure of the present invention;

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

[0031] Figure 9 is a cross-sectional view of the inner water inlet spraying component of the present invention;

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

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

[0034] Figure 12 is a schematic diagram of the result when the heating plate of the present invention is rotated to the outside of the waterproof coating for heating;

[0035] Figure 13 is a schematic structural diagram of the present invention during the reverse water pressure test.

[0036] Description of reference numerals in the figure:

[0037] 1. External fixing cylinder; 2. Detection cylinder; 201. Detection cavity; 3. Inner rotating cylinder; 301. Injection notch; 4. Specimen; 401. Crack; 402. Waterproof coating; 5. Sealing plate; 6. Rotating gear sleeve; 7. External injection box; 8. External injection pipe; 801. External nozzle; 9. Heating plate; 10. Detection box; 11. Humidity sensor; 12. Detection layer; 13. Detection camera; 14. Inner injection cylinder; 15. Injection channel; 16. Inner injection pipe; 161. Inner injection nozzle. Specific embodiments

[0038] The following will combine the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0039] Embodiment 1: In view of the problem of replacing specimens during the positive and reverse water pressure tests, the test method is optimized. At the same time, in view of the problem that the conventional test environment fails to simulate the cyclic state of the waterproof coating when repeatedly encountering water and drying, resulting in inaccurate water pressure resistance performance obtained by the test, the following technical solutions are proposed:

[0040] The present invention discloses a device for testing the performance of a concrete waterproof coating. Please refer to Figure 1 、 Figure 2 It includes an external fixing cylinder 1 and a detection cylinder 2 that are coaxially and fixedly installed inside and outside on the detection table. The lower ends of the external fixing cylinder 1 and the detection cylinder 2 both penetrate to the bottom of the detection table. An inner rotating cylinder 3 is rotatably driven inside the detection cylinder 2. A placement cavity for placing the specimen 4 is formed between the inner rotating cylinder 3 and the detection cylinder 2. The specimen 4 is a cylindrical concrete specimen structure formed by butt-jointing multiple fan-shaped concrete blocks end to end. A crack 401 is formed between adjacent two concrete blocks, and a waterproof coating 402 is coated on the outer ring gap where adjacent two concrete blocks are butted. A plurality of detection cavities 201 that are annularly opened on the end wall of the detection cylinder 2 and correspond to the position of the waterproof coating 402 and have upper openings are provided;

[0041] Please refer to Figure 3 、 Figure 4, select concrete blocks that can simulate the on-site standard construction process, make them into fan-shaped structures, splice the concrete blocks with multiple fan-shaped structures into an annular structure, apply waterproof materials at the vertical butt joints of adjacent two concrete blocks, and cure to form a waterproof coating 402, constituting a specimen 4 of an annular integral structure, with multiple waterproof coatings 402 formed on its outer annular surface. Place the pretreated specimen 4 into the detection cylinder 2, and the waterproof coating 402 just corresponds to the detection cavity 201.

[0042] A sealing plate 5 that is hermetically installed at the top of the detection cylinder 2 and seals the upper part of the specimen 4 is embedded and installed. Buckle grooves are provided on both the sealing plate 5 and the specimen 4 for convenient taking. And a docking block that is docked with the buckle groove on the specimen 4 is provided at the bottom end of the sealing plate 5. After placing the specimen 4 to be detected into the placement cavity, then cover the sealing plate 5 on the specimen 4. The periphery of the sealing plate 5 is clamped with multiple detection cavities 201, playing a sealing role in the cracks 401 formed in the upper part of the specimen 4.

[0043] Please refer to Figures 4 - 9 , on the inner side wall of the outer fixing cylinder 1, a plurality of outer water inlet spraying components corresponding to the positions of the detection cavities 201 are annularly driven and installed through a rotating structure. Among them, the rotating structure includes a pair of rotating tooth sleeves 6 that are rotatably installed on the upper and lower inner walls of the outer fixing cylinder 1 and are used for fixing the outer water inlet spraying components. An outer gear that is respectively meshed and connected with the pair of rotating tooth sleeves 6 is rotatably installed in the up and down direction on the outside of the outer fixing cylinder 1, and a driving motor one for rotating and driving the outer gear is fixedly installed at the lower end of the detection table;

[0044] The outer water inlet spraying component includes an outer spraying box 7 fixed between a pair of rotating tooth sleeves 6. An empty groove that opens downward and toward the side of the detection cavity 201 is opened inside the outer spraying box 7. A vertically arranged outer spraying pipe 8 is inserted into the empty groove. A plurality of outer nozzles 801 that are perpendicular to the detection cavity 201 are distributed on the end wall of the outer spraying pipe 8 located in the empty groove;

[0045] On the end wall of the inner rotating cylinder 3, a plurality of detection layers 12 corresponding to the positions of the detection cavities 201 are embedded and installed. A detection camera 13 is fixedly installed at the top end of the inner rotating cylinder 3, and an inner water inlet spraying component that is spaced and staggered with the positions of the detection layers 12 is also fixedly installed inside the inner rotating cylinder 3. Spraying notch openings 301 corresponding to the positions of the inner water inlet spraying component are 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 driving motor two for rotating and driving the connecting shaft is fixedly installed on the bottom end wall of the detection cylinder 2. Driving gears that are meshed with each other are fixedly installed on both the driving end of the driving motor two and the connecting shaft;

[0046] The inner water injection assembly includes an inner injection cylinder 14 fixedly inserted inside the inner rotating cylinder 3. A plurality of injection channels 15 are annularly distributed on the outer end wall of the inner injection cylinder 14, which are arranged alternately with the detection chamber 201 and are movably and sealingly attached to the inner wall of the inner rotating cylinder 3. An inner injection pipe 16 is inserted through the inside of the inner injection cylinder 14. A plurality of inner injection nozzles 161 penetrating to the inside of the injection channels 15 are distributed on the inner end wall of the inner injection cylinder 14 where the inner injection pipe 16 is located.

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

[0048] The basic principle includes: Please refer to Figure 1 , Figure 3 , after placing the specimen 4 in the placement chamber inside the detection cylinder 2, it is sealed and covered at its upper end using a sealing plate 5. Please refer to Figure 10 , Figure 11 , during the process of positive pressure test, multiple external injection boxes 7 are used to gradually pressurize the detection chamber 201, simulating the scenario of water flow penetrating from the coating surface into the concrete interior in actual engineering. The cooperation between the detection layer 12 and the detection camera 13 on the other side of the crack is used to detect whether there is a positive penetration phenomenon in the waterproof coating 402;

[0049] During the process of reverse pressure test, please refer to Figure 12 , Figure 13 , rotate the inner rotating cylinder 3 so that the multiple injection slots 301 correspond to the positions of the inner cracks 401 of the specimen 4 one by one. At this time, use the internal inner water injection assembly to inject into the cracks 401, simulating the scenario of water flow penetrating from the internal cracks of the concrete to the coating surface in actual engineering. During this process, the waterproof coatings 402 that have failed in penetration during the positive water pressure test are excluded;

[0050] During the entire test process, considering the synchronous test of multiple waterproof coatings 402, on the one hand, it improves the detection contrast. On the other hand, by first performing the positive pressure test from the outside to the inside and then the reverse pressure test from the inside to the outside, the test process will not require replacing the specimen due to severe damage to the specimen, simplifying the test process.

[0051] And during the intermittent periods of successive pressurization in the positive and reverse water pressure tests, the waterproof coating 402 is repeatedly dried through the heating plate 9, simulating the repeated waterproof environment of the waterproof coating in actual engineering and improving the detection accuracy.

[0052] Embodiment 2: For the test device of Embodiment 1, a method for testing the performance of a concrete waterproof coating is proposed. Please refer to Figures 10 - 13 , which includes the following steps:

[0053] S1. Specimen pretreatment: Apply waterproof material at the vertical butt joints of two adjacent concrete blocks, cure them, and multiple waterproof coatings 402 are formed on the outer side of the specimen 4 that constitutes an annular integral structure. Place the specimen 4 in the test cylinder 2 and cover it with the sealing plate 5;

[0054] S2. Forward water pressure test: In the initial state, multiple outer spray boxes 7 correspond to multiple detection cavities 201 one by one. Open the water source of the outer spray pipe 8, start pressurizing upward with a gradient increase starting from 1 MPa. The pressurized water flow is vertically sprayed at the waterproof coating 402 through multiple outer nozzles 801 to simulate the scenario of water seeping from the coating surface into the concrete in actual engineering;

[0055] During the intervals of successive pressurizations, rotate the heating plate 9 to the outside of the waterproof coating 402 to dry it, simulating the repeated waterproof environment of the waterproof coating in actual engineering. The cooperation between the detection layer 12 on the other side of the crack and the detection camera 13 is used to detect whether there is a forward penetration phenomenon in the waterproof coating 402. When the detection camera 13 detects that the detection layer 12 is penetrated and soaked, it indicates that at a certain spraying pressure, the waterproof coating 402 has an infiltration phenomenon. Otherwise, it indicates that under the condition of pressurizing to the preset maximum pressure, the waterproof coating 402 has no infiltration phenomenon;

[0056] S3. Reverse water pressure test: Synchronously rotate multiple groups of detection boxes 10 to the outside of the waterproof coating 201. At the same time, rotate the driving inner rotating cylinder 3 so that multiple groups of spraying slots 301 correspond to the inside of the crack 401 one by one. Open the water source of the inner spray pipe 16, and also start pressurizing upward with a gradient increase starting from 1 MPa. The pressurized water flow is vertically sprayed through multiple inner spray nozzles 161, and the water flow is sprayed into the crack 401 through the spray channel 15 and the spraying slots 301 to simulate the scenario of water seeping from the internal crack of the concrete to the coating surface in actual engineering;

[0057] During the intervals of successive pressurizations, start the heating plate 9 to dry the waterproof coating 402, simulating the repeated waterproof environment of the waterproof coating in actual engineering. The cooperation between the detection box 10 under the heating plate 9 and the humidity sensor 11 is used to detect whether there is a reverse penetration phenomenon in the waterproof coating 402. When the humidity sensor 11 detects humidity, it indicates that at a certain spraying pressure, the waterproof coating 402 has an infiltration or breakthrough phenomenon. Otherwise, it indicates that under the condition of pressurizing to the preset maximum pressure, the waterproof coating 402 has no infiltration phenomenon.

[0058] This test method uses a forward pressure test from the outside to the inside and a reverse pressure test from the inside to the outside, swapping the conventional test procedures in the background technology;

[0059] First, a forward water pressure test is carried out. This forward water pressure test is a test of supplying water from the outside to the inside. When conducting the forward water pressure test, during the intervals of successive pressurization, the heating plate 9 is started to dry the waterproof coating 402, simulating the repeated waterproof environment of the waterproof coating in actual projects;

[0060] The cooperation between the detection layer 12 on the other side of the crack and the detection camera 13 is used to detect whether there is a forward penetration phenomenon in the waterproof coating 402. The detection layer 12 is made of a water-absorbing material, and a water-absorbing material with strong water absorption can be selected according to actual needs. For example, a sheet structure made of hydrogel is used, which rapidly swells and changes its shape when encountering water. When the detection camera 13 detects that the detection layer 12 is penetrated and soaked, it indicates that at a certain injection pressure, the waterproof coating 402 has an infiltration phenomenon. 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 infiltration phenomenon can be selected according to actual needs. On the contrary, after successive pressurization, if the waterproof coating 402 does not show an infiltration phenomenon, it indicates that under the condition of pressurizing to the preset maximum pressure, the waterproof coating 402 can resist the forward water pressure test and is a qualified coating;

[0061] That is, the forward pressure test from the outside to the outside can detect the water barrier ability of the waterproof coating 402 and its sealing performance with the concrete base layer. If the waterproof coating 402 can effectively prevent water penetration under the forward water pressure, it indicates that the coating has good performance in normal waterproofing. Multiple groups of waterproof coatings 402 can be set for synchronous pressurization tests to improve the test accuracy.

[0062] After the forward water pressure test is completed, multiple waterproof coatings 402 can resist the forward water pressure test. If there are a few waterproof coatings 402 that show an infiltration phenomenon, then this test object will be excluded during the subsequent reverse water pressure test;

[0063] During the reverse water pressure test, this reverse water pressure test is a test of supplying water from the inside to the outside. For the waterproof coating 402 that has passed the forward water pressure test from the outside to the inside, subsequent reverse tests are carried out. During this process, multiple groups of detection boxes 10 are synchronously rotated to the bottom ends of multiple detection cavities 201 one by one, and at the same time, the inner rotating cylinder 3 is rotated by the driving force, so that multiple groups of injection channels 15 are respectively corresponding to the inner side positions of the cracks 401 to conduct the reverse water pressure test. During the intervals of successive pressurization, the heating plate 9 is started to dry the waterproof coating 402, simulating the repeated waterproof environment of the waterproof coating in actual projects.

[0064] During the successive extrusion reverse test, the cooperation between the detection box 10 and the humidity sensor 11 is 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 at a certain spraying pressure, the waterproof coating 402 has a reverse penetration phenomenon. On the contrary, after successive pressurization, the waterproof coating 402 does not show any penetration phenomenon, indicating that under the condition of pressurizing to the preset maximum pressure, the waterproof coating 402 can resist the reverse water pressure test, and it passes the positive and negative two-way detection.

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

[0066] To sum up: Based on the principle of conventional water pressure penetration test, the detection mode and method of the specimen are improved and optimized. Specifically, by setting the coaxial positions of the outer fixed cylinder 1, the detection cylinder 2 and the inner rotating cylinder 3, it is convenient to place the specimen 4 forming an annular structure in the detection cylinder 2. Multiple groups of waterproof coatings 402 on the specimen 4 correspond to multiple detection cavities 201 one by one, providing multi-specimen same-group detection, and adopting the positive water pressure test from outside to inside first and then the reverse water pressure test from inside to outside. The specimen does not need to be replaced during the test process;

[0067] In addition, it should be emphasized that during the successive pressurization intervals of the positive and reverse water pressure tests, the waterproof coating 402 is repeatedly dried by the heating plate 9 to simulate the repeated waterproof environment of the waterproof coating in actual engineering and improve the detection accuracy. The setting of the heating plate 9 can also provide a high-temperature environment during the positive and reverse pressure test detections to detect whether the waterproof coating is affected by high temperature during the waterproof process, and more directly reflect the actual use situation of the waterproof performance of the coating.

[0068] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto; any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A concrete waterproof coating performance testing device, comprising an outer fixing cylinder (1) and a detection cylinder (2) coaxially fixedly mounted on a detection platform, characterized in that: The detection cylinder (2) is internally driven to rotate and install an inner rotating cylinder (3), a placement cavity for placing a sample (4) is formed between the inner rotating cylinder (3) and the detection cylinder (2), a waterproof coating coated on the outside of the crack (401) is provided around the sample (4), and a plurality of detection cavities (201) corresponding to the positions of the waterproof coating (402) and open at the upper ends are provided in an annular manner on the end wall of the detection cylinder (2); The inner side wall of the outer fixed cylinder (1) is driven in a circular manner by a rotating structure to be provided with a plurality of outer water inlet injection assemblies arranged corresponding to the position of the detection cavity (201); a heating plate (9) is installed on one side of the outer water inlet injection assembly; a plurality of detection layers (12) corresponding to the position of the detection cavity (201) are embedded and installed on the end wall of the inner rotating cylinder (3); an inner water inlet injection assembly is installed inside the inner rotating cylinder (3); and an injection slot (301) corresponding to the position of the inner water inlet injection assembly is opened on the end wall of the inner rotating cylinder (3).

2. A concrete waterproof coating performance testing device according to claim 1, characterized in that: The sample (4) is a cylindrical concrete sample structure formed by a plurality of fan-shaped concrete blocks butted end to end, a crack (401) is formed between two adjacent concrete blocks, a waterproof coating (402) is applied to the outer ring gap between the two adjacent concrete blocks, and a sealing plate (5) sealed to the upper part of the sample (4) is embedded and installed on the top of the detection tube (2).

3. A concrete waterproof coating performance testing device according to claim 1, characterized in that: The rotating structure comprises a pair of rotating gear sleeves (6) rotatably mounted on the upper and lower inner walls of the external fixed cylinder (1) and used to fix the external water inlet spray assembly, an external gear respectively meshing with the pair of rotating gear sleeves (6) is rotatably mounted on the outer side of the external fixed cylinder (1) in the upper and lower directions, and a driving motor 1 for driving the external gear is fixedly mounted at the lower end of the detection platform.

4. A concrete waterproof coating performance testing device according to claim 3, characterized in that: The external water inlet spray assembly comprises an external spray box (7) fixed between a pair of rotating gear sleeves (6), a vertically arranged external spray pipe (8) is provided inside the external spray box (7), and a plurality of external nozzles (801) arranged vertically with respect to the detection cavity (201) are distributed on the end wall of the external spray pipe (8) located in the hollow groove.

5. A concrete waterproof coating performance testing device according to claim 1, characterized in that: The inner water injection assembly comprises an inner injection cylinder (14) fixedly inserted inside the inner rotating cylinder (3), a plurality of injection channels (15) arranged in an annular manner and staggered with the detection cavity (201) are arranged on the outer end wall of the inner injection cylinder (14), an inner injection pipe (16) is passed through the inner part of the inner injection cylinder (14), and the inner injection pipe (16) has a plurality of injection nozzles (161) arranged toward the injection channels (15).

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

7. A method for testing the performance of a concrete waterproof coating, using a device for testing the performance of a concrete waterproof coating as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1. Sample pretreatment: Apply waterproof material to the vertical joint cracks of two adjacent concrete blocks to form a waterproof coating (402), place the sample (4) in the detection tube (2), and cover it with a sealing plate (5); S2, positive water pressure test: open the water inlet of the external spray pipe (8), and pressurize with a gradient upward from 1 MPa as the starting value, and spray the pressurized water vertically on the waterproof coating (402), simulating the water flow penetrating from the coating surface to the concrete in the actual project; In the gaps between successive 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 projects, and the detection layer (12) is detected using a detection camera (13) to determine whether the waterproof coating (402) meets the requirements of a positive pressure test; S3, reverse water pressure test: the detection box (10) is rotated to the outside of the detection chamber (201), and at the same time, the inner rotating cylinder (3) is rotated to make the multiple groups of injection slots (301) correspond to the inner side of the crack (401) one by one, and the water inlet source of the inner injection pipe (16) is opened. The pressure is increased in a gradient upward with 1 MPa as the starting value, and water is injected into the crack (401) to simulate the scene of water flow penetrating from the internal cracks of concrete to the surface of the coating in actual engineering. In this process, the waterproof coating (402) that has failed the penetration during the forward water pressure test is eliminated; In the gaps between successive pressurizations, the heating plate (9) is started 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) cooperates with the humidity sensor (11) to detect whether there is reverse penetration in the waterproof coating (402) and determine whether the waterproof coating (402) meets the requirements of reverse pressure test.

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