Device and method for testing internal water permeability of porous asphalt pavement material

Abstract

This invention relates to the field of new material testing technology, specifically to a device and method for testing the internal permeability of porous asphalt pavement materials. The device includes a testing support, an inner cylinder, and a telescopic cylinder. The inner cylinder is disposed within the testing support, and the telescopic cylinder is installed within the testing support via a first elastic element. An inner cavity and an outer cavity are defined between the testing support, the inner cylinder, and the telescopic cylinder. This device for testing the internal permeability of porous asphalt pavement materials utilizes the testing support, inner cylinder, telescopic cylinder, and limiting ring in coordination. By leveraging the elastic pressure of the first elastic element and the mechanical force exerted when the testing support is pressed down, the sealing material is uniformly compressed and spread, reducing labor costs and operational difficulty. Furthermore, by using the wall of the telescopic cylinder as the boundary of the inner cavity, the device prevents the sealing material from permeating into the inner cavity during the application and pressure process, thus improving the accuracy of testing porous asphalt pavement materials.

Description

Technical Field

[0001] This invention relates to the field of new material testing technology, specifically to a device and method for testing the internal water permeability of porous asphalt pavement materials. Background Technology

[0002] As a new type of road surface material for highway construction, porous asphalt pavement material, with its unique porous structure, can quickly drain water from the road surface, reduce the risk of water film slippage, and effectively alleviate urban flooding and reduce traffic noise. It meets the construction needs of modern highways for greening and functionality, and has gradually become one of the mainstream new materials in highway construction.

[0003] For new porous asphalt pavement materials, accurate internal permeability testing is crucial for assessing pavement condition and promptly identifying early-stage permeability degradation and other defects. This provides data support for targeted maintenance measures, ultimately extending highway lifespan and ensuring traffic safety. Currently, testing of new porous asphalt pavement materials primarily relies on the principle of water infiltration, assessing permeability by measuring the depth or amount of water penetration over a specific time period. Before use, the testing device requires sealing the annular area outside the testing zone. Existing technologies typically employ manual application of sealant for this purpose. However, manual application makes it difficult to guarantee uniformity and sealing. Furthermore, if the sealant enters the testing area, it alters the physical properties of the area, interfering with the normal water penetration process and leading to data inaccuracies that fail to accurately reflect the true permeability of the pavement. Summary of the Invention

[0004] This invention provides a device and method for testing the internal water permeability of porous asphalt pavement materials, in order to solve the problem that existing testing devices often suffer from poor uniformity and sealing performance of manually applied sealing materials when sealing the annular area before testing porous asphalt pavement materials, which can easily lead to deviations in test data.

[0005] The present invention provides a device for testing the internal permeability of porous asphalt pavement materials, which adopts the following technical solution: A device for testing the internal permeability of porous asphalt pavement materials includes a testing support, an inner cylinder, and a telescopic cylinder. The testing support is arranged vertically, is hollow inside, and its lower end face can abut against the pavement. The inner cylinder is fixedly arranged inside the testing support and is coaxial with the testing support. The telescopic cylinder is installed inside the testing support through a first elastic element. The telescopic cylinder is sleeved with the inner cylinder and slides and seals with the inner cylinder. The first elastic element causes the telescopic cylinder to extend vertically out of the testing support in the initial state. An inner cavity and an outer cavity are defined between the testing support, the inner cylinder, and the telescopic cylinder. The inner cavity is located inside the outer cavity. A measuring cylinder is provided on the testing support and can communicate with the inner cavity. A limiting ring is provided in the outer cavity. The limiting ring is coaxially arranged and fixedly connected with the testing support and seals the outer cavity. An application area for applying sealing material is defined between the lower end face of the testing support, the lower end face of the limiting ring, and the outer peripheral wall of the telescopic cylinder.

[0006] Furthermore, the graduated cylinder is made of transparent plexiglass, has graduations, and is connected to the testing support via a support frame.

[0007] Furthermore, the measuring cylinder is connected to the inner cavity via a water inlet valve.

[0008] Furthermore, the testing support is equipped with an exhaust valve that can communicate with the inner cavity.

[0009] Furthermore, a device for testing the internal permeability of porous asphalt pavement materials also includes multiple counterweights, each of which can press down on the testing support.

[0010] Furthermore, a protrusion is provided on the outer peripheral wall of the telescopic cylinder. The protrusion is annular and can abut against the limiting ring.

[0011] Furthermore, the telescopic cylinder is equipped with a movable ring, which is located inside the outer cavity and slides and seals with the outer cavity. The movable ring can move up and down synchronously with the telescopic cylinder. In the initial state, the outer cavity is filled with water. Multiple valves are provided on the outer peripheral wall of the inner cylinder, and the outer cavity can communicate with the inner cavity through the valves.

[0012] Furthermore, the cross-sectional area of ​​the inner cavity perpendicular to the vertical direction is smaller than the cross-sectional area of ​​the outer cavity perpendicular to the vertical direction.

[0013] Furthermore, the movable ring is screwed to the telescopic cylinder.

[0014] This invention also provides a method for testing the internal permeability of porous asphalt pavement materials, utilizing the aforementioned device for testing the internal permeability of porous asphalt pavement materials, comprising the following steps:

[0015] S10, apply sealant to the application area;

[0016] S20, the telescopic cylinder is pressed against the road surface and the detection support is pressed down. The pressure of the detection support causes relative movement between the telescopic cylinder and the detection support, and the sealing material is compressed to fill the space between the coating area and the road surface.

[0017] S30 connects the measuring cylinder to the inner cavity and injects a measured amount of clean water into the measuring cylinder.

[0018] The beneficial effects of this invention are as follows: The internal permeability performance testing device for porous asphalt pavement materials of this invention, by setting up a testing support, an inner cylinder, a telescopic cylinder, and a limiting ring in cooperation, utilizes the elastic pressure of the first elastic element and the mechanical force when the testing support is pressed down to make the sealing material be evenly squeezed and spread, filling the gap between the application area and the pavement, thus reducing labor costs and operational difficulty; and by using the cylinder wall of the telescopic cylinder as the boundary of the inner cavity, it can effectively prevent the sealing material from penetrating into the inner cavity during the application and pressure process of the sealing material, ensuring that the test is not interfered with and improving the accuracy of the test of porous asphalt pavement materials.

[0019] Furthermore, by setting a protrusion on the outer peripheral wall of the telescopic cylinder, when the pressure testing support brings the telescopic cylinder and the limiting ring closer to each other in the vertical direction, the telescopic cylinder will stop moving after the protrusion on it abuts against the limiting ring. During this process, the sealing material will be compressed, filling the space between the coating area and the road surface to form a reliable sealing structure. Since the distance from the limiting ring to the protrusion in the vertical direction is constant, the degree to which the sealing material is pressed down during each test will tend to be consistent, thereby making the sealing effect of each test more consistent.

[0020] Furthermore, by setting up a moving ring, as the testing support is pressed down and the telescopic cylinder retracts to the testing support, the volume of the inner cavity gradually decreases, creating a positive pressure state for the gas inside the inner cavity. Simultaneously, the telescopic cylinder drives the moving ring to move synchronously, allowing water from the outer cavity to enter the inner cavity through the valve. Under the positive pressure within the inner cavity, the water is forced into the porous asphalt pavement, expelling the gas from the pores and filling them with water, thus preventing air bubbles from adversely affecting subsequent permeability testing. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a testing device for the internal permeability performance of porous asphalt pavement materials according to the present invention;

[0023] Figure 2 This is a schematic diagram of a partial structure of an embodiment of a testing device for the internal permeability performance of porous asphalt pavement materials according to the present invention;

[0024] Figure 3 This is a cross-sectional view of the telescopic cylinder extending out of the testing support in an embodiment of a porous asphalt pavement material internal permeability testing device of the present invention.

[0025] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 This is a cross-sectional view of the telescopic cylinder after retracting the testing support, according to an embodiment of the internal permeability testing device for porous asphalt pavement materials of the present invention.

[0027] Figure 6 for Figure 5 Enlarged view of point B in the middle;

[0028] Figure 7 This is a cross-sectional view of an embodiment of the internal permeability testing device for porous asphalt pavement materials of the present invention, showing the telescopic cylinder extending out of the testing support and the coating area being coated with sealant.

[0029] Figure 8 This is a cross-sectional view of an embodiment of a testing device for the internal permeability performance of porous asphalt pavement materials according to the present invention, after the telescopic cylinder retracts to test the support and the sealing material in the coated area is compacted.

[0030] In the diagram: 100, detection support; 110, measuring cylinder; 120, limiting ring; 130, support frame; 200, inner cylinder; 210, valve; 300, telescopic cylinder; 310, first elastic element; 320, protrusion; 330, moving ring; 400, inner cavity; 500, outer cavity; 600, water valve; 700, air vent valve; 800, counterweight; 900, sealing material. Detailed Implementation

[0031] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] An embodiment of the present invention provides a device for testing the internal permeability of porous asphalt pavement materials, such as... Figures 1 to 8 As shown.

[0033] A device for testing the internal permeability of porous asphalt pavement materials includes a test support 100, an inner cylinder 200, and a telescopic cylinder 300. The test support 100 is vertically oriented, hollow inside, and its lower end face can abut against the pavement. The inner cylinder 200 is fixedly installed inside the test support 100 and coaxial with it. The inner cylinder 200 and the test support 100 are integrally formed. The telescopic cylinder 300 is installed inside the test support 100 via a first elastic element 310. The telescopic cylinder 300 is sleeved with the inner cylinder 200 and slides and seals with the inner cylinder 200. The first elastic element 310 causes the telescopic cylinder 300 to extend vertically out of the test support 100 in the initial state. The first elastic element 310 is vertically oriented and is a compression spring. An inner cavity 400 and an outer cavity 500 are defined between the detection support 100, the inner cylinder 200, and the telescopic cylinder 300, with the inner cavity 400 located within the outer cavity 500. A measuring cylinder 110 is mounted on the detection support 100 and communicates with the inner cavity 400. A limiting ring 120 is provided within the outer cavity 500, coaxially mounted and fixedly connected to the detection support 100, sealing the outer cavity 500. The lower end face of the limiting ring 120 is coplanar with the lower end face of the detection support 100, and the lower end face of the detection support 100, the lower end face of the limiting ring 120, and the outer peripheral wall of the telescopic cylinder 300 define an application area for applying the sealing material 900.

[0034] Specifically, the measuring cylinder 110 is made of transparent plexiglass, has graduations, and is connected to the testing support 100 via a support frame 130. The support frame 130 includes a support plate and multiple connecting rods, which are evenly distributed around the central axis of the testing support 100. The support plate is bolted to the connecting rods, and the measuring cylinder 110 is mounted on the support plate.

[0035] In this embodiment, by setting up a detection support 100, an inner cylinder 200, a telescopic cylinder 300, and a limiting ring 120 in cooperation, before testing, the entire testing device is laid down, and sealing material 900 is applied to the application area defined by the lower end face of the detection support 100, the lower end face of the limiting ring 120, and the outer peripheral wall of the telescopic cylinder 300. At this time, the telescopic cylinder 300 extends vertically from the detection support 100 under the action of the first elastic element 310, providing sufficient operating space for applying the sealing material 900. After applying the sealing material 900, the entire testing device is straightened and aligned with the position to be tested. Then, the telescopic cylinder 300 is pressed against the road surface and the detection support 100 is pressed down. During the pressing process, the telescopic cylinder 300 will move relative to the detection support 100, so that the telescopic cylinder 300 is gradually pressed into the detection support 100, and the first elastic element 310 is compressed. Furthermore, the relative movement between the telescopic cylinder 300 and the testing support 100 will also compress the sealing material 900, filling the space between the coated area and the road surface to form a reliable sealing structure. After sealing, the measuring cylinder 110 is connected to the inner cavity 400, and a measured amount of clean water is injected into the inner cavity 400 through the measuring cylinder 110. The scale of the measuring cylinder 110 is used to record the water level change or seepage volume in the inner cavity 400 at different time points in real time. Combined with the time parameters, the seepage rate or total seepage volume of the road surface is calculated to complete the internal seepage performance test of the porous asphalt pavement.

[0036] The entire testing device utilizes the elastic pressure of the first elastic element 310 and the mechanical force when the test support 100 is pressed down to make the sealing material 900 be evenly squeezed and spread, filling the gap between the application area and the road surface, thus reducing labor costs and operational difficulty. Furthermore, by using the wall of the telescopic cylinder 300 as the boundary of the inner cavity 400, the device can effectively prevent the sealing material 900 from penetrating into the inner cavity 400 during the application and pressure process, ensuring that the test is not interfered with and improving the accuracy of the test of porous asphalt pavement materials.

[0037] In a further embodiment, the measuring cylinder 110 is connected to the inner cavity 400 via a water valve 600, which is screwed to the support plate of the support frame 130 and the detection support 100 respectively.

[0038] Furthermore, the testing support 100 is equipped with an exhaust valve 700, which can communicate with the inner cavity 400.

[0039] By setting a water inlet valve 600, water inlet valve 600 is opened when it is necessary for water in measuring cylinder 110 to enter inner cavity 400, and closed otherwise, water in measuring cylinder 110 is restricted from entering inner cavity 400. By setting an air vent valve 700, air in inner cavity 400 can be discharged during use.

[0040] In a further embodiment, a device for testing the internal permeability of porous asphalt pavement materials also includes multiple counterweights 800, each of which can press down on the test support 100.

[0041] By setting a counterweight 800, the pressure on the sealing material 900 can be increased, ensuring the quality of the seal.

[0042] In a further embodiment, a protrusion 320 is provided on the outer peripheral wall of the telescopic cylinder 300. The protrusion 320 is annular and can abut against the limiting ring 120.

[0043] By setting a protrusion 320 on the outer peripheral wall of the telescopic cylinder 300, when the pressure testing support 100 brings the telescopic cylinder 300 and the limiting ring 120 closer to each other in the vertical direction, the telescopic cylinder 300 will stop moving after the protrusion 320 on it abuts against the limiting ring 120. During this process, the sealing material 900 will be compressed, filling the gap between the coating area and the road surface to form a reliable sealing structure. Since the distance from the limiting ring 120 to the protrusion 320 in the vertical direction is constant, the degree to which the sealing material 900 is pressed down during each test will tend to be consistent, thereby making the sealing effect of each test tend to be consistent.

[0044] In a further embodiment, a movable ring 330 is provided on the telescopic cylinder 300. The movable ring 330 is located inside the outer cavity 500 and slides and seals with the outer cavity 500. In the initial state, the movable ring 330 abuts against the limiting ring 120, and the movable ring 330 can move up and down synchronously with the telescopic cylinder 300. In the initial state, the outer cavity 500 is filled with water. Multiple valves 210 are provided on the outer peripheral wall of the inner cylinder 200, and the outer cavity 500 can communicate with the inner cavity 400 through the valves 210. Among them, the valves 210 are prior art, and can only open to connect the inner cavity 400 and the outer cavity 500 when subjected to a certain pressure.

[0045] Furthermore, the cross-sectional area of ​​the inner cavity 400 perpendicular to the vertical direction is smaller than the cross-sectional area of ​​the outer cavity 500 perpendicular to the vertical direction.

[0046] In this embodiment, by setting up a moving ring 330, as the detection support 100 is pressed down and the telescopic cylinder 300 retracts into the detection support 100, the volume of the inner cavity 400 gradually decreases, creating a positive pressure state for the gas in the inner cavity 400. Simultaneously, the telescopic cylinder 300 drives the moving ring 330 to move synchronously, allowing water from the outer cavity 500 to enter the inner cavity 400 through the valve 210. Under the positive pressure in the inner cavity 400, the water is forced into the porous asphalt pavement, expelling the gas from the pores and filling them with water, thus preventing air bubbles from adversely affecting subsequent water permeability testing. By making the cross-sectional area of ​​the inner cavity 400 perpendicular to the vertical direction smaller than the cross-sectional area of ​​the outer cavity 500 perpendicular to the vertical direction, when the telescopic cylinder 300 moves a unit distance, the amount of water entering the inner cavity 400 from the outer cavity 500 will be greater than the amount of gas volume compressed in the inner cavity 400. As a result, even under positive pressure, some water will remain on the asphalt pavement and will not seep into the pavement completely, so that water can always fill the holes in the asphalt pavement and prevent gas from returning to the holes.

[0047] Specifically, the movable ring 330 is fixedly connected to the telescopic cylinder 300. By fixing the movable ring 330 to the telescopic cylinder 300, the telescopic cylinder 300 can drive the movable ring 330 to move synchronously.

[0048] Alternatively, the movable ring 330 can be screwed onto the telescopic cylinder 300. By screwing the movable ring 330 onto the telescopic cylinder 300, the telescopic cylinder 300 can be rotated relative to the movable ring 330 before use, adjusting the distance between the protrusion 320 and the limiting ring 120, thereby changing the application thickness of the sealing material 900 and the final formed thickness of the sealing material 900, and adjusting the amount of sealing material 900 used. When testing the water permeability of the same asphalt pavement, after several tests to roughly assess the water permeability of the section, if the water permeability of the section is good, water will not easily overflow. At this time, the telescopic cylinder 300 can be rotated to change the amount of sealing material 900 needed and adjust the amount of water entering the inner cavity 400 from the outer cavity 500, achieving the goal of saving sealing material 900 while still enabling normal testing.

[0049] Based on the above embodiments, the specific working process is as follows:

[0050] Before testing, the entire testing device is laid down, and the sealing material 900 is applied to the application area defined by the lower end face of the testing support 100, the lower end face of the limiting ring 120, and the outer peripheral wall of the telescopic cylinder 300. The telescopic cylinder 300 will extend vertically out of the testing support 100 under the action of the first elastic element 310, providing sufficient operating space for the application of the sealing material 900. At this time, the water valve 600 and the air valve 700 are both closed.

[0051] After applying the sealant 900, align the entire testing device with the area to be tested. Then, press the telescopic cylinder 300 against the road surface and down onto the testing support 100. During this pressing process, the telescopic cylinder 300 will move relative to the testing support 100, gradually being pressed into the testing support 100 and compressing the first elastic element 310. The telescopic cylinder 300 will stop moving after its protrusion 320 abuts against the limiting ring 120. During this process, the sealant 900 will be compressed, filling the space between the applied area and the road surface to form a reliable sealing structure.

[0052] Furthermore, as the testing support 100 is pressed down and the telescopic cylinder 300 retracts into the testing support 100, the volume of the inner cavity 400 gradually decreases, creating a positive pressure state for the gas within the inner cavity 400. Simultaneously, the telescopic cylinder 300 drives the moving ring 330 to move synchronously, allowing water from the outer cavity 500 to enter the inner cavity 400 through the valve 210. Under the positive pressure within the inner cavity 400, the water is forced into the porous asphalt pavement, expelling the gas from the pores of the asphalt pavement and filling the pores with water, thus preventing the presence of air bubbles from adversely affecting subsequent water permeability testing. By making the cross-sectional area of ​​the inner cavity 400 perpendicular to the vertical direction smaller than that of the outer cavity 500 perpendicular to the vertical direction, the amount of water entering the inner cavity 400 from the outer cavity 500 will be greater than the amount of gas compressed in the inner cavity 400 when the telescopic cylinder 300 moves a unit distance. This ensures that even under positive pressure, some water will remain on the asphalt pavement and will not completely seep into the pavement, thus keeping the water in the pores of the asphalt pavement and preventing gas from returning to the pores. This completes the sealing process.

[0053] After sealing, water is injected into the measuring cylinder 110, and the water inlet valve 600 and the air outlet valve 700 are opened. The water in the measuring cylinder 110 can enter the inner cavity 400 through the water inlet valve 600, and the gas in the inner cavity 400 will be discharged through the air outlet valve 700. When the inner cavity 400 is full of water and water is escaping from the air outlet valve 700, it is considered that all the gas in the inner cavity 400 has been discharged. The air outlet valve 700 is then closed, and the counterweight 800 is pressed onto the test support 100. The water level change or seepage volume in the inner cavity 400 at different time points is recorded in real time using the scale of the measuring cylinder 110. Combined with the time parameters, the seepage rate or total seepage volume of the pavement is calculated to complete the internal seepage performance test of the porous asphalt pavement.

[0054] After the test is completed, keep the water valve 600 open, then lift the test support 100. The telescopic cylinder 300 is always in contact with the road surface under the action of the first elastic element 310, that is, the telescopic cylinder 300 extends relative to the test support 100. At this time, the volume of the outer cavity 500 increases, and the water in the inner cavity 400 is drawn back to the outer cavity 500 through the valve 210, so as to store water for the next test.

[0055] This invention also provides a method for testing the internal permeability of porous asphalt pavement materials, utilizing the aforementioned device for testing the internal permeability of porous asphalt pavement materials, comprising the following steps:

[0056] S10, apply sealant 900 to the application area.

[0057] S20, the telescopic cylinder 300 is pressed against the road surface and the detection support 100 is pressed down. The pressure of the detection support 100 causes the telescopic cylinder 300 and the detection support 100 to move relative to each other, and the sealing material 900 is pressed to fill the space between the coating area and the road surface.

[0058] S30, connect the measuring cylinder 110 to the inner cavity 400 and inject a certain amount of clean water into the measuring cylinder 110. Use the scale of the measuring cylinder 110 to record the water level change or seepage volume in the inner cavity 400 at different time points in real time, and combine the time parameters to calculate the seepage rate or total seepage volume of the road surface, and complete the internal seepage performance test of the porous asphalt pavement.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for testing the internal permeability of porous asphalt pavement materials, characterized in that: The system includes a detection support, an inner cylinder, and a telescopic cylinder. The detection support is vertically oriented, hollow inside, and its lower end face can abut against the road surface. The inner cylinder is fixedly installed inside the detection support and coaxial with it. The telescopic cylinder is installed inside the detection support via a first elastic element. The telescopic cylinder is sleeved with the inner cylinder and slides and seals with the inner cylinder. The first elastic element allows the telescopic cylinder to extend vertically out of the detection support in its initial state. An inner cavity and an outer cavity are defined between the detection support, the inner cylinder, and the telescopic cylinder. The inner cavity is located within the outer cavity. A measuring cylinder is installed on the detection support and can communicate with the inner cavity. A limit switch is provided within the outer cavity. The ring, the limiting ring, and the detection support are coaxially arranged and fixedly connected. The limiting ring seals the outer cavity. The lower end face of the detection support, the lower end face of the limiting ring, and the outer peripheral wall of the telescopic cylinder define an area for applying sealing material. A movable ring is provided on the telescopic cylinder. The movable ring is located inside the outer cavity and slides and seals with the outer cavity. The movable ring can move up and down synchronously with the telescopic cylinder. Initially, the outer cavity is filled with water. Multiple valves are provided on the outer peripheral wall of the inner cylinder. The outer cavity can communicate with the inner cavity through the valves. The cross-sectional area of ​​the inner cavity perpendicular to the vertical direction is smaller than the cross-sectional area of ​​the outer cavity perpendicular to the vertical direction.

2. The device for testing the internal permeability of porous asphalt pavement materials according to claim 1, characterized in that: The graduated cylinder is made of transparent plexiglass, has graduations, and is connected to the testing support via a support frame.

3. The device for testing the internal permeability of porous asphalt pavement materials according to claim 1, characterized in that: The graduated cylinder is connected to the inner cavity via a water inlet valve.

4. The device for testing the internal permeability of porous asphalt pavement materials according to claim 1, characterized in that: The testing support is equipped with an exhaust valve, which can communicate with the inner cavity.

5. The device for testing the internal permeability of porous asphalt pavement materials according to claim 1, characterized in that: It also includes multiple counterweights, all of which can press down on the testing support.

6. The device for testing the internal permeability of porous asphalt pavement materials according to claim 1, characterized in that: The outer peripheral wall of the telescopic cylinder is provided with a protrusion, which is annular and can abut against the limiting ring.

7. The device for testing the internal permeability of porous asphalt pavement materials according to claim 1, characterized in that: The movable ring is screwed to the telescopic cylinder.

8. A method for testing the internal permeability of porous asphalt pavement materials, utilizing the internal permeability testing device for porous asphalt pavement materials as described in any one of claims 1 to 7, characterized in that: Includes the following steps: S10, apply sealant to the application area; S20, the telescopic cylinder is pressed against the road surface and the detection support is pressed down. The pressure of the detection support causes relative movement between the telescopic cylinder and the detection support, and the sealing material is compressed to fill the space between the coating area and the road surface. S30 connects the measuring cylinder to the inner cavity and injects a measured amount of clean water into the measuring cylinder.

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