Device and method for testing water penetration resistance of concrete expansion joint sealing material

Abstract

The invention discloses a device and a method for testing the water penetration resistance of a concrete expansion joint sealing material, and belongs to the technical field of sealing material performance testing. A device for testing water permeability resistance of a concrete expansion joint sealing material comprises a test bed, the test bed is provided with at least one group of test areas, the test areas are used for placing detection pieces, and fixing pieces used for fixing the detection pieces are arranged above the test areas; the liquid supply assembly is used for applying pressure liquid to the detection piece; the detection piece is arranged in the test bed and is tightly attached to the upper cover plate through a sealing ring and a limiting plate; according to the invention, the problem of impermeability detection of the concrete expansion joint sealing material is solved; the color-changing test paper can clearly display the position of a water seepage point and the water seepage degree; the test pieces with the sealing material stretching rate of 100% or below can be tested by the test device provided by the invention; the structure is simple, operation is convenient, and results are displayed clearly; water pressure is adjusted through compression of the air bag, and the air bag is simple and practical to operate.

Description

Technical Field

[0001] The invention relates to the technical field of sealing material performance testing, and in particular to a device and method for testing the water penetration resistance of a concrete expansion joint sealing material. Background Art

[0002] In order to prevent shrinkage and cracking of concrete on the slope of hydraulic water supply channels during construction, expansion joints need to be designed and sealing materials need to be inserted. Some channel concrete will be in contact with water for a long time and bear a certain amount of water pressure. However, there are no relevant standards and specifications for the sealing effect of sealing materials in water environment (i.e., waterproof penetration performance). The national standards GB / T13477.1-GB / T 13477.23 are about the test methods for building sealing materials, and there is no test method for the water penetration resistance of sealing materials. The test methods used in JC / T 483 "Polysulfide Building Sealant", JC / T 881 "Building Sealant for Concrete Joints" and JC / T976 "Sealant for Road and Bridge Caulking" are all implemented with reference to GB / T 13477, so there are no index requirements for the waterproof penetration performance of sealing materials.

[0003] In view of the above problems, the present invention provides a device and method for testing the water penetration resistance of concrete expansion joint sealing materials with simple structure and convenient operation. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that there is a lack of water penetration resistance test for sealing materials in the prior art, and to propose a device and method for testing the water penetration resistance of concrete expansion joint sealing materials.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for testing the water penetration resistance of a concrete expansion joint sealing material comprises a test bench, wherein the test bench is provided with at least one group of test areas, wherein the test areas are used to place a test piece, and a fixing piece for fixing the test piece is provided above the test area; the device also comprises: a liquid supply component, used to apply pressurized liquid to the test piece; and a color-changing test paper, which is arranged in the test bench and is tightly fitted to the table surface through a sealing ring and a limit plate.

[0007] Preferably, the test bench comprises an upper cover plate and a box body, wherein the upper cover plate is arranged at the top opening of the box body, and a water retaining edge is extended upward from the top surface of the upper cover plate around the upper cover plate, wherein a liquid inlet pipe and a liquid discharge pipe are arranged on the side wall of the box body, the liquid inlet pipe is connected with the liquid supply component, an overflow hole is arranged on the upper cover plate, and an overflow pipe connected with the overflow hole is arranged on the box body.

[0008] Furthermore, the liquid supply assembly includes: a water tank, wherein a first exhaust hole is provided on the top of the water tank, a liquid supply pipe is provided on the side wall of the water tank, and the liquid supply pipe is connected to the liquid inlet pipe; an air bag is provided inside the water tank, and an air supply pipe extending to the outside of the water tank is provided on the air bag.

[0009] Furthermore, it also includes: a sample water supply pipe extending to the test area, the sample water supply pipe is connected with the liquid inlet pipe and the liquid discharge pipe; a second exhaust hole and a pressure gauge connected with the water supply pipe.

[0010] Furthermore, valves are provided on the first exhaust hole, the second exhaust hole, the liquid inlet pipe, the liquid discharge pipe and the liquid supply pipe.

[0011] Furthermore, the detection component includes a sealing material and a mortar block bonded to the sealing material, and an isolation pad block arranged on the side of the sealing material, the color-changing test paper is fitted with the mortar block and the sealing material, the limit plate is welded on the upper cover plate, and the sealing ring is arranged between the mortar block and the limit plate, wherein the sealing material is 50mm long and 12-24mm wide, the mortar block is 75mm long and 25mm wide, the side length of the isolation pad adjacent to the sealing material is 12-24mm, and the side length adjacent to the mortar block is 12.5mm, the limit plate is a U-shaped ring with a square inner hole, the inner hole size range is 77-79mm, the outer size is greater than or equal to 127mm, the thickness is 2-4mm, the ring width is greater than or equal to 25mm, the sealing ring is a U-shaped ring with a square inner hole, the inner hole side length is 39mm, the ring width is 18mm, the outer ring side length is 75mm, the thickness is 2-4mm, and the material is elastic rubber.

[0012] Furthermore, the fixing member includes a fixing strip, which is abutted against the mortar block, wherein bolt holes are provided at both ends of the fixing strip, and the bolts pass through the bolt holes and are connected to the upper cover plate.

[0013] A method for testing the water penetration resistance of a concrete expansion joint sealing material comprises the following steps:

[0014] Step 1: Sample treatment, seal the sample where the mortar block and the sealing material are bonded together: before the water resistance test of the specimen, use paraffin or paint to seal the surface of the mortar block in contact with water and wait for it to completely solidify; during the water resistance test, if it is in a tensile state, the isolation pad and the sealing material should fit tightly, and the joints should fit tightly with the sealing ring to prevent water seepage at the isolation pad. If water seepage is still possible at the isolation pad, 703 silicone sealant can be applied to the contact surface between the isolation pad and the mortar block and the sealing material before the test. The water resistance test can be carried out after the 703 glue is cured for 12 hours; before the water resistance test, the specimen should be placed in a glass desiccator for 24 hours or dried naturally for 48 hours under standard test conditions.

[0015] Step 2: Water injection test, applying a preset water pressure to the sealing material under standard test conditions;

[0016] Step 3: When the airbag in the water tank is in a state of a small amount of gas, open the liquid supply pipe and the first exhaust hole of the water tank to start filling water, and when water overflows from the first exhaust hole, close the liquid supply pipe;

[0017] Step 4: Open the liquid inlet pipe, close the liquid discharge pipe, open the second exhaust hole, open the gas storage tank, open the liquid supply pipe, and start to fill the water supply pipe of the test bench through the liquid inlet pipe. Stop filling water after a small amount of water overflows from the water inlet hole of the test bench;

[0018] Step 5: Wipe the moisture off the test area with a clean cloth or paper, install the sealing ring, test piece, and color-changing test paper in the test area, and then install the test piece fixing strip and fix it with bolts. The size of the isolation pad is determined by the elongation of the sealing material.

[0019] Step 6: Open the liquid supply pipe to connect it with the water storage tank, start filling water, and stop filling water after water overflows from the second exhaust hole and close the second exhaust hole, and wipe off the water marks on the test area;

[0020] Step 7: Use a manual or electric air pump to start inflating the airbag. When the pressure gauge reading reaches the preset pressure, stop inflating and maintain the pressure. Record the start time of the test. Observe the color change of the color-changing test paper every 2 hours. End the test after 12 hours and record the test results.

[0021] Step 8: When the airbag starts to deflate and the pressure gauge returns to zero, stop deflation, close the liquid supply pipe and the liquid inlet pipe, open the second exhaust hole, open the drain pipe, drain the water into a waste bucket or other container, remove the fixing strip, take out the test piece group and the sealing ring, and clean the table.

[0022] Step nine: Result determination. Observe the color change of the water-discoloration test papers of the three test piece groups. No judgment will be made on a small amount of color change in the isolation pad area. If the color change area is large and has affected the judgment of the sealing material area, re-testing is required and the isolation pad area must be sealed. If the isolation pad area is well sealed and there are no color change points in the sealing material areas of more than two of the three test piece groups, the anti-seepage performance of this group of test pieces is qualified. Otherwise, it is judged as unqualified.

[0023] Preferably, the standard test conditions in step 2 are: temperature 21° C. to 25° C., relative humidity 45% to 55%, preset pressure less than or equal to 0.3 MPa, and elongation of the sealing material less than or equal to 100%.

[0024] Compared with the prior art, the present invention provides a device and method for testing the water penetration resistance of concrete expansion joint sealing materials, which has the following beneficial effects:

[0025] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention solves the problem of detecting the impermeability of concrete expansion joint sealing materials; the color-changing test paper can clearly display the location and degree of water seepage; the test pieces with a sealing material elongation of 100% or less can be tested using the test device of the present invention; the structure is simple, the operation is convenient, and the results are clearly displayed; the water pressure is adjusted by compressing the airbag, and the airbag operation is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The structure of the present invention is shown in FIG. Figure 1 ;

[0027] Figure 2 It is a schematic diagram of the test piece structure proposed by the present invention;

[0028] Figure 3 It is a schematic diagram of the side structure of the test piece proposed by the present invention;

[0029] Figure 4 The structure of the present invention is shown in FIG. Figure 2 .

[0030] In the figure: 1. Upper cover; 2. Water inlet; 3. Test area; 4. Limit plate; 5. Second exhaust hole; 6. Pressure gauge; 7. Fixed pressure strip; 8. Overflow hole; 9. Overflow pipe; 10. Box body; 11. Liquid inlet pipe; 12. Liquid discharge pipe; 13. Liquid supply pipe; 14. First exhaust hole; 15. Air bag; 16. Air supply pipe; 17. Water storage tank; 18. Mortar block; 19. Sealing material; 20. Isolation pad; 21. Sealing ring; 22. Bolt hole; 23. Color-changing test paper; 24. Water supply pipe. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Example:

[0034] Reference Figure 1-Figure 4, a device and method for testing the water penetration resistance of concrete expansion joint sealing materials, including a test bench, on which at least one group of test areas 3 are arranged. In this scheme, three groups are preferably arranged. Limiting plates 4 are welded around the test area 3. The limiting plates 4 are U-shaped rings with square inner holes. The inner hole size ranges from 77 to 79 mm, the outer size is greater than or equal to 127 mm, the thickness is 2 to 4 mm, and the ring width is greater than or equal to 25 mm. The limiting plates 4 are fixed in the test area 3 by full welding or bonding to prevent leakage. The test area 3 is used to place a detection piece, and a fixing piece for fixing the detection piece is arranged above the test area 3; it also includes: a liquid supply component for applying pressure liquid to the detection piece; a color-changing test paper 23, which is arranged in the test bench and is tightly fitted with the upper cover plate 1 through a sealing ring 21 and a limiting plate 4.

[0035] The test bench is rectangular as a whole and is made of stainless steel. The thickness of the spliced ​​plate is more than 3mm to ensure sufficient strength and no deformation during the test. It specifically includes an upper cover plate 1 and a box body 10. The upper cover plate 1 is arranged on the top opening of the box body 10, and a water retaining edge is extended upward on the top surface of the upper cover plate 1. The height of the water retaining edge is not less than 3cm. Three water inlet holes 2 are preferably equidistantly provided on the top surface. The diameter of the water inlet holes 2 is 3-5mm, and the distance between the water inlet holes 2 is not less than 16cm. Among them, the side wall of the box body 10 is provided with a liquid inlet pipe 11 and a liquid discharge pipe 12. The liquid inlet pipe 11 is connected to the liquid supply component. The upper cover plate 1 is provided with an overflow hole 8 with a diameter of 10mm, and the box body 10 is provided with an overflow pipe 9 connected to the overflow hole 8.

[0036] The liquid supply component includes: a water storage tank 17, which has a structure of a pressure-resistant cylinder (with a pressure resistance of not less than 1.0 MPa), a removable sealed arc-shaped cover is arranged on the upper part of the tank body, the water storage volume is not less than 10 liters, and the tank body is made of stainless steel or pressure-resistant plastic, wherein a first exhaust hole 14 is arranged on the top of the water storage tank 17, and a liquid supply pipe 13 is arranged on the side wall of the water storage tank 17, and the liquid supply pipe 13 is connected to the liquid inlet pipe 11; an air bag 15 is arranged inside the water storage tank 17, the volume of the air bag 15 is not less than 1.5 liters, and the pressure resistance level is not less than 0.8 MPa, and the air bag 15 is provided with an air supply pipe 16 extending to the outside of the water storage tank 17.

[0037] It also includes: a sample water supply pipe 24 extending to the test area 3, the water supply pipe 24 is made of stainless steel or a pressure-resistant plastic pipe or other pressure-resistant and corrosion-resistant materials, and the sample water supply pipe 24 is connected to the liquid inlet pipe 11 and the liquid discharge pipe 12; a second exhaust hole 5 and a pressure gauge 6 connected to the water supply pipe 24, the pressure gauge 6 has a range of not higher than 0.6MPa, and an accuracy level of not lower than 0.4, and can be a mechanical pressure gauge or a digital pressure gauge, and the digital pressure gauge can be battery-powered or externally powered.

[0038] Valves are provided on the first exhaust hole 14 , the second exhaust hole 5 , the liquid inlet pipe 11 , the liquid discharge pipe 12 and the liquid supply pipe 13 .

[0039] The detection part includes a sealing material 19 and a mortar block 18 bonded to the sealing material 19. Specifically, the width of the sealing material 19 is 12 mm when not stretched and 24 mm when stretched 100%, and the stretching range is not higher than 100%. There is also an isolation pad 20 arranged on the side of the sealing material 19. The material of the isolation pad 20 can be wood, steel, stainless steel, aluminum, plastic or other materials. The color-changing test paper 23 is in contact with the mortar block 18 and the sealing material 19. A sealing ring 21 is arranged between the mortar block 18 and the limiting plate 4, mainly to prevent water from seeping out from the bottom during the test. The sealing ring 21 is a U-shaped ring with a square inner hole. The side length of the inner hole is 39 mm, the ring width is 18 mm, the side length of the outer ring is 75 mm, the ring thickness is 2-4 mm, and the material is an elastic rubber sealing material, such as silicone rubber, chloroprene rubber and styrene-butadiene rubber.

[0040] Here, the sealing material 19 is 50 mm long and 12-24 mm wide, the mortar block 18 is 75 mm long and 25 mm wide, the side length of the isolation pad 20 adjacent to the sealing material 19 is 12-24 mm, and the side length and width adjacent to the mortar block 18 is 12.5 mm.

[0041] The color-changing test paper 23 may also be a water-changing color indicator. When a water-changing test paper is used, it is preferably in the form of a self-adhesive paper on one side so that it can be pasted on the surface of the test piece.

[0042] The fixing part includes a fixing strip 7, which is abutted against the mortar block 18, wherein bolt holes 22 are provided at both ends of the fixing strip 7, and the bolts are connected to the upper cover plate 1 through the bolt holes 22. The fixing strip 7 is a rectangular plate-like structure as a whole, with a width not greater than 25 mm, a length not less than 127 mm, and a thickness not less than 3 mm (based on the screw being tightened without deformation), and the material can be steel, aluminum or stainless steel, etc.

[0043] The specific test method for the water penetration resistance of concrete expansion joint sealing materials includes the following steps:

[0044] Step 1: Sample treatment, seal the test piece where the mortar block 18 and the sealing material 19 are bonded together: before the test piece's water resistance test, the surface of the mortar block 18 that contacts water should be sealed with paraffin or paint and wait for it to completely solidify; during the water resistance test, if it is in a tensile state, the isolation pad 20 and the sealing material 19 should fit tightly, and the joint should fit tightly with the sealing ring 21 to prevent water seepage from the isolation pad 20. If water seepage is still possible at the isolation pad 20, 703 silicone sealant can be applied to the contact surface (3 sides) of the isolation pad 20, the mortar block 18 and the sealing material 19 before the test (other sealants that are easy to remove can also be used on the surface of the isolation pad 20 after the test), and the water resistance test can be carried out after the 703 glue is cured for 12 hours; before the water resistance test, the test piece should be placed in a glass desiccator for 24 hours or dried naturally under a standard test environment for 48 hours (the dryness of the test piece can be judged by the fact that the water-discoloring test paper does not change color after being pasted).

[0045] Before sample processing, select test equipment and materials in the following ways:

[0046] A: Test substrate: The sealant test substrate shall be a cement mortar substrate that complies with GB / T 13477.1. There shall be no pores on the bonding surface of the substrate. When the substrate needs to be coated with an interface agent, it shall be applied according to the manufacturer's requirements.

[0047] B: The test equipment, specimen preparation and test methods required for the following tests of sealing materials shall refer to the corresponding standards: tensile adhesion (GB / T13477.8), tensile adhesion after immersion in water (GB / T13477.9), fixed stretch adhesion (GB / T13477.10), fixed stretch adhesion after immersion in water (GB / T13477.11), adhesion after tension-compression cycle at the same temperature (GB / T13477.12), adhesion after cold drawing-hot pressing (GB / T13477.13), cold drawing-hot pressing adhesion after immersion in water (GB / T13477.14), elastic recovery rate (GB / T13477.17);

[0048] C: After the above tests (GB / T13477.8 to GB / T13477.14 and GB / T13477.17), the test pieces that are evaluated as qualified can be used for the test device of the present invention to measure the sealing material anti-permeability test, and the number of test pieces is preferably 3 groups;

[0049] Step 2: water injection test, applying a preset water pressure to the sealing material 19 under standard test conditions of a temperature of 21°C to 25°C, a relative humidity of 45% to 55%, a preset pressure less than or equal to 0.3Mpa, and a tensile rate of the sealing material 19 less than or equal to 100%;

[0050] Step 3: The air bag 15 in the water tank 17 is in a state of a small amount of gas, and the water tank supply pipe 13 and the first exhaust hole 14 are opened to start water injection. When water overflows from the first exhaust hole 14, the supply pipe 13 is closed;

[0051] Step 4: Open the liquid inlet pipe 11, close the liquid discharge pipe 12, open the second exhaust hole 5, open the gas storage tank 17, open the liquid supply pipe 13, start to inject water into the water supply pipe 24 of the test bench through the liquid inlet pipe 11, and stop injecting water after a small amount of water overflows from the water inlet hole 2 of the test bench;

[0052] Step 5: Wipe the moisture off the surface of the test area 3 with a clean cloth or paper, install the sealing ring 21, the test piece group (mortar block 18, sealing material 19 and isolation pad 20), and the color-changing test paper 23 in the test area 3, and then install the test piece fixing strip 7, and fix it with bolts. The size of the isolation pad 20 is determined by the elongation rate of the sealing material 19;

[0053] Step 6: Open the liquid supply pipe 13 to connect it with the water storage tank 17, start water injection, stop water injection and close the second exhaust hole 5 after water overflows from the second exhaust hole 5, and wipe off the water marks on the test area 3;

[0054] Step 7: Use a manual or electric air pump to start inflating the airbag 15, and stop inflating when the reading of the pressure gauge 6 reaches the preset pressure, maintain the pressure, record the start time of the test, observe the color change of the color-changing test paper 23 every 2 hours, and end the test after 12 hours, and record the test results;

[0055] Step 8: The airbag 15 starts to deflate. After the pressure gauge 6 returns to zero, stop deflation, close the liquid supply pipe 13 and the liquid inlet pipe 11, open the second exhaust hole 5, open the drain pipe 12, drain the water into a waste water bucket or other container, remove the fixing pressure strip 7, take out the test piece group and the sealing ring 21, and clean the table.

[0056] Step nine: Determine the results. Observe the color change of the water-discoloration test paper 23 of the three test piece groups. If there is a small amount of color change in the isolation pad 20 area, no judgment will be made. If the color change area is large and has affected the judgment of the sealing material 19 area, it is necessary to re-test and seal the isolation pad 20 area. If the isolation pad 20 area is well sealed and there are no color change points in the sealing material 19 area of ​​more than two of the three test piece groups, the anti-seepage performance of this group of test pieces is qualified. Otherwise, it is judged as unqualified.

[0057] According to the above experimental method, the following table shows examples under different preset pressure and stretching rate combinations (such as Example 3 is an example when the preset pressure is 0.15 MPa and the stretching rate is 50%). The actual test is not limited to the examples in the table:

[0058] Example 1 2 3 4 5 6 Preset water pressure / Mpa 0.05 0.10 0.15 0.20 0.25 0.30 Sealing material elongation / % 0 20 50 60 100 0

[0059] In the present invention, a certain water pressure is applied at the interface between the sealing material 19 and the concrete. If there is a bonding defect between the sealing material 19 and the concrete surface, water may penetrate, and the water-changing test paper 23 will change color at the water seepage location. If the sealing material 19 is tightly bonded to the concrete surface, it can resist water penetration. The maximum water pressure of this test is set to a water depth of 30 meters (i.e., 0.3MPa).

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for testing the water penetration resistance of concrete expansion joint sealing materials, comprising a test bench, characterized in that: The test bench is provided with at least one set of test areas (3). The test area (3) is used to place the test piece, and a fixing piece for fixing the test piece is arranged above the test area (3); Also includes: A liquid supply assembly, used for applying pressurized liquid to the detection element; The color-changing test paper (23) is arranged in the test bench and is tightly fitted to the upper cover plate (1) via a sealing ring (21) and a limiting plate (4).

2. A device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 1, characterized in that: The test bench comprises an upper cover plate (1) and a box body (10), wherein the upper cover plate (1) is arranged to cover the top opening of the box body (10), and a water retaining edge is extended upward from the top surface of the upper cover plate (1) on all four sides. The side wall of the box body (10) is provided with a liquid inlet pipe (11) and a liquid discharge pipe (12), the liquid inlet pipe (11) is connected to the liquid supply assembly, the upper cover plate (1) is provided with an overflow hole (8), and the box body (10) is provided with an overflow pipe (9) connected to the overflow hole (8).

3. A device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 2, characterized in that: The liquid supply assembly comprises: Water storage tank (17), The top of the water storage tank (17) is provided with a first exhaust hole (14), the side wall of the water storage tank (17) is provided with a liquid supply pipe (13), and the liquid supply pipe (13) is connected to the liquid inlet pipe (11); An air bag (15) is arranged inside a water storage tank (17), and an air supply pipe (16) extending to the outside of the water storage tank (17) is arranged on the air bag (15).

4. A device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 3, characterized in that: Also includes: A sample water supply pipe (24) extending to the test area (3), wherein the sample water supply pipe (24) is connected to the liquid inlet pipe (11) and the liquid discharge pipe (12); A second exhaust hole (5) and a pressure gauge (6) are connected to the water supply pipe (24).

5. A device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 4, characterized in that: Valves are provided on the first exhaust hole (14), the second exhaust hole (5), the liquid inlet pipe (11), the liquid discharge pipe (12) and the liquid supply pipe (13).

6. A device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 2, characterized in that: The detection member comprises a sealing material (19) and a mortar block (18) bonded to the sealing material (19); and An isolation pad (20) is arranged on the side of the sealing material (19), the color change test paper (23) is fitted with the mortar block (18) and the sealing material (19), the limit plate (4) is welded to the upper cover plate (1), and the sealing ring (21) is arranged between the mortar block (18) and the limit plate (4). The sealing material (19) is 50 mm long and 12-24 mm wide, the mortar block (18) is 75 mm long and 25 mm wide, the side length of the isolation pad (20) adjacent to the sealing material (19) is 12-24 mm, and the side length adjacent to the mortar block (18) is 12.5 mm, the limiting plate (4) is a U-shaped ring with a square inner hole, the inner hole size range is 77-79 mm, the outer size is greater than or equal to 127 mm, the thickness is 2-4 mm, the ring width is greater than or equal to 25 mm, the sealing ring (21) is a U-shaped ring with a square inner hole, the inner hole side length is 39 mm, the ring width is 18 mm, the outer ring side length is 75 mm, the thickness is 2-4 mm, and the material is elastic rubber.

7. A device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 6, characterized in that: The fixing member comprises a fixing strip (7), the fixing strip (7) abuts against the mortar block (18), Wherein, both ends of the fixed pressure strip (7) are provided with bolt holes (22), and the bolts pass through the bolt holes (22) and are connected to the upper cover plate (1).

8. A method for testing the water penetration resistance of concrete expansion joint sealing materials, comprising the device for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 7, characterized in that: The following steps are also included: Step 1: Sample processing, sealing the sample in which the mortar block (18) and the sealing material (19) are bonded together; Step 2: Water injection test, applying preset water pressure to the sample under standard test conditions; Step 3: Observe the color-changing test paper (23) and obtain the test result.

9. A method for testing the water penetration resistance of concrete expansion joint sealing materials according to claim 8, characterized in that: The standard test conditions in step 2 are: temperature 21°C to 25°C, relative humidity 45% to 55%, preset pressure less than or equal to 0.3Mpa, and elongation of the sealing material (19) less than or equal to 100%.

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