Test system and test method for hydrophobic roadbed performance test

Abstract

The invention discloses a test system and method for hydrophobic roadbed performance testing, and relates to the technical field of hydrophobic roadbed performance testing, the test system comprises: a transparent test cylinder, the transparent test cylinder is filled with soil containing a hydrophobic material for simulating a hydrophobic roadbed; the environment loading module comprises a pressurizing device and a heating device; the water inlet module comprises a water distribution plate connected with the water tank; the data acquisition module comprises a temperature sensor, a humidity sensor and a displacement sensor; a permeable stone is arranged at the bottom of the transparent test cylinder, whether a hydrophobic material in the hydrophobic roadbed is damaged or not is judged according to the color change of the permeable stone, and related data are recorded to determine the performance of the hydrophobic roadbed; according to the invention, the performance of different hydrophobic roadbeds can be tested, and the water inlet pressure can be changed through the arranged water inlet device, so that the performance of the hydrophobic roadbeds under different water inlet pressures can be tested.

Description

Technical Field

[0001] The invention relates to the technical field of hydrophobic roadbed testing, and in particular to a testing system and a testing method for hydrophobic roadbed performance testing. Background Art

[0002] Under the effects of dry-wet, freeze-thaw cycles and traffic loads, the roadbed is often in an over-humid state during its service life, and the stiffness and strength of the roadbed decay quickly, resulting in the road surface life being far lower than the design life, causing serious economic losses. Hydrophobic materials have excellent hydrophobic properties and are easy to construct, low cost, high durability and environmentally friendly. The application of hydrophobic materials in roadbed waterproof layers belongs to the use of emerging materials, which helps to improve highway quality, save traditional materials, reduce engineering workload, and reduce engineering costs.

[0003] However, the current research on the application of hydrophobic materials in roadbed waterproof layers is still relatively limited and needs to be further developed. Since it is difficult to conduct a large number of field tests on the field service performance of hydrophobic roadbeds, the test costs are too high, the test time is long and the error is large, resulting in the application of hydrophobic materials in roadbed waterproof layers mainly relying on experience and lacking theoretical guidance, making it difficult to give full play to the advantages of hydrophobic materials, and thus making it difficult to guarantee the performance of roadbed waterproof layers using hydrophobic materials. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a test system and a test method for testing the performance of a hydrophobic roadbed, which can realize the testing of the performance of different hydrophobic roadbeds and provide guidance for the application of hydrophobic materials in the roadbed waterproof layer.

[0005] The technical solution of the present invention is as follows:

[0006] In a first aspect of the present invention, a test system for testing the performance of a hydrophobic roadbed is provided, comprising:

[0007] A transparent test cylinder filled with soil containing hydrophobic material to simulate a hydrophobic roadbed;

[0008] The environmental loading module includes a pressurizing device and a heating device, which are used to apply pressure and temperature to the hydrophobic roadbed respectively;

[0009] A water inlet module, comprising a water tank connected to a transparent test cylinder through a water pipe, for providing water inlet of a set height to the hydrophobic roadbed, wherein the water tank stores water dyed with a dye;

[0010] A data acquisition module, including a temperature sensor, a humidity sensor, and a displacement sensor, is used to monitor the temperature, humidity, and displacement of the hydrophobic roadbed during the test;

[0011] A permeable stone is arranged at the bottom of the transparent test cylinder, and whether the hydrophobic material in the hydrophobic roadbed is damaged is judged according to the color change of the permeable stone, and the relevant data is recorded to determine the performance of the hydrophobic roadbed.

[0012] In some embodiments of the present invention, the side wall of the transparent test tube is made of a transparent acrylic plate, the bottom of the transparent test tube is made of a thermal conductive plate, and the acrylic plate and the thermal conductive plate are sealed with a rubber sealing ring.

[0013] In some embodiments of the present invention, the heat conduction plate is made of a material selected from the group consisting of ceramic, copper, ceramic, aluminum and graphite, and the permeable stone is located above the heat conduction plate.

[0014] In some embodiments of the present invention, the pressurizing device includes a servo hydraulic press, a loading rod and a loading cap. The output end of the servo hydraulic press is connected to the loading cap through the loading rod. The loading cap also serves as a heating plate, and the side of the heating plate is wrapped by a rubber ring.

[0015] In some embodiments of the present invention, the heating device adopts electric heating, the heating plate is connected to the power supply through a wire, and the temperature is controlled by a temperature controller.

[0016] In some embodiments of the present invention, a water injection space is reserved between the loading cap and the filled hydrophobic roadbed sample, and a water pipe is connected to the transparent test cylinder corresponding to the water injection space.

[0017] In some embodiments of the present invention, the water distribution plate is connected to the water tank via a water pipe, and a water pump, a pressure gauge and a flow regulating valve are provided on the water pipe.

[0018] In some embodiments of the present invention, a plurality of the temperature sensors, humidity sensors and displacement sensors are provided and are evenly distributed in the height direction within the hydrophobic roadbed.

[0019] In a second aspect of the present invention, a test method for testing water inlet pressure of a hydrophobic roadbed is provided, comprising the following steps:

[0020] Fill the hydrophobic roadbed sample into a transparent test cylinder and perform compaction treatment;

[0021] The hydrophobic roadbed sample is heated to a set temperature by a heating device to simulate a real temperature environment;

[0022] Inject water of a set height into the transparent test cylinder through the water inlet module, and apply pressure through the pressure device until the color of the permeable stone changes;

[0023] The performance of the hydrophobic roadbed sample is obtained based on the collected test data.

[0024] In some embodiments of the present invention, according to the pressure applied by the pressurizing device, the temperature applied by the heating device, and the time when the color changes during water permeation, a fitting formula describing the hydrophobic performance of the hydrophobic roadbed sample can be obtained, as follows:

[0025] According to the pressure applied by the pressurizing device, the temperature applied by the heating device, and the time when the color changes during water permeation, a fitting formula describing the hydrophobic performance of the hydrophobic roadbed sample can be obtained as follows:

[0026] BP=asin(bT)+cln(1+t)+dh e

[0027] Wherein, BP represents breakthrough pressure, that is, the pressure applied by the pressurizing device that can make water break through the hydrophobic material in the hydrophobic roadbed sample, in kPa; T is the heating temperature of the heating device, in °C; t is the time for the permeable stone to change color, in s; h is the thickness of the hydrophobic material, in cm; a, b, c, d, and e are all fitting constants.

[0028] One or more technical solutions of the present invention have the following beneficial effects:

[0029] (1) The visual precision test device suitable for intelligent testing of water inlet pressure of a hydrophobic roadbed provided by the present invention can realize the testing of the performance of different hydrophobic roadbeds. The water inlet pressure can be changed by the set pressurizing device, thereby testing the performance of the hydrophobic roadbed under different water inlet pressures. The real environment of different loads and different temperatures can be simulated by the set environmental loading module, thereby improving the accuracy of the test results.

[0030] (2) The visualized precision test device for intelligent testing of water inlet pressure of a hydrophobic roadbed provided by the present invention can realize the performance test of the hydrophobic roadbed under different working conditions. The water penetration during the test can be visualized by setting a transparent test tube. At the same time, the water penetration process inside the hydrophobic roadbed can be timely understood through the synergistic effect of the humidity sensor and the permeable stone. The water permeability of the permeable stone can be used to timely determine whether the hydrophobic roadbed sample is damaged, and then the hydrophobic performance of the hydrophobic roadbed can be evaluated by reading the pressure applied by the pressurizing device.

[0031] (3) The test method for testing the water inlet pressure of the hydrophobic roadbed provided by the present invention simulates the change of the water inlet pressure by first injecting water with a set water head and then using a pressurizing device to pressurize. Compared with the method of directly using water pressure for loading, the pressurizing method of the present invention can ensure the accuracy of pressure loading and pressure control, and improve the accuracy of the test results.

[0032] (4) The test method for testing the water inlet pressure of the hydrophobic roadbed provided by the present invention can simulate the drainage process of the roadbed during rainfall, can effectively simulate the change of ambient temperature during rainfall, and quantify the relationship between different hydrophobic materials, material dosages and different soils, as well as the influence of different water accumulation amounts and different loads on the performance of the hydrophobic roadbed. It provides a scientific basis for the construction of the hydrophobic roadbed, can make full use of the experience of hydrophobic materials in other fields, and make appropriate adjustments and optimizations to achieve effective application in the roadbed waterproof layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of a visualized precision test device suitable for intelligent testing of water inlet pressure of a hydrophobic roadbed according to the present invention;

[0034] Figure 2 The present invention is a flow chart of the test method for testing the water inlet pressure of the hydrophobic roadbed.

[0035] In the figure: 1. loading rod; 2. flow regulating valve; 3. water tank; 4. water pipe; 5. servo hydraulic press; 6. loading cap; 7. data acquisition module; 8. data acquisition instrument; 9. support rod; 10. wire; 11. nut; 12. power supply; 13. base; 14. temperature conduction plate; 15. permeable stone; 16. hydrophobic roadbed sample; 17. transparent test cylinder; 18. temperature controller; 19. top plate; 20. cylinder cover; 21. water injection space. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Example 1

[0038] In a typical embodiment of the present invention, a test system for testing the performance of a hydrophobic roadbed is provided, such as Figure 1 As shown, including:

[0039] A transparent test cylinder 17, wherein the transparent test cylinder 17 is filled with soil containing hydrophobic material to simulate a hydrophobic roadbed;

[0040] The environmental loading module includes a pressurizing device and a heating device, which are used to apply pressure and temperature to the hydrophobic roadbed respectively;

[0041] A water inlet module, comprising a water tank 3 connected to a transparent test tube 17 via a water pipe 4, for providing water inlet of a set height to the hydrophobic roadbed, wherein the water tank stores water dyed with a dye;

[0042] Data acquisition module 7, including temperature sensor, humidity sensor and displacement sensor, used to monitor the temperature, humidity and displacement of the hydrophobic roadbed during the test;

[0043] A permeable stone 15 is arranged at the bottom of the transparent test tube. Whether the hydrophobic material in the hydrophobic roadbed is damaged is judged according to the color change of the permeable stone 15, and the performance of the hydrophobic roadbed is determined by recording relevant data.

[0044] In this embodiment, the side wall of the transparent test tube 17 is made of a transparent acrylic plate, and the bottom surface of the transparent test tube 17 is made of a thermal conductive plate 14. The acrylic plate and the thermal conductive plate 14 are sealed with a rubber sealing ring. By using a transparent acrylic plate, the phenomenon of water migration during the test can be observed. At the same time, the acrylic plate has a heat insulation effect, which prevents the internal simulated temperature from being transferred in multiple directions along the side wall of the acrylic plate. Furthermore, in order to prevent heat from being lost from the side wall of the transparent test tube 17 during the test and reduce the test accuracy, the outer wall of the transparent test tube 17 can be wrapped with a transparent insulation layer, and the material of the transparent insulation layer can be polyurethane. A tube cover 20 is also provided on the top of the transparent test tube 17 to seal the transparent test tube.

[0045] Furthermore, the thermal conductive plate 14 is made of a material selected from ceramic, copper, ceramic, aluminum and graphite, and the permeable stone 15 is located above the thermal conductive plate 14. When the temperature set during the test is higher than the room temperature, the heat is transferred from top to bottom, and the hot air goes back after touching the bottom, which leads to a large temperature difference at different positions of the hydrophobic roadbed sample to be tested, thereby affecting the accuracy of the test. After the thermal conductive plate is set, the excess heat can be discharged through the thermal conductive plate. Since the permeable stone has a heat conduction function, it is difficult to release the temperature outside the device. Therefore, the additionally set thermal conductive plate is used to discharge the continuous heat during the test outside the device.

[0046] In this embodiment, the pressurizing device includes a servo hydraulic machine 5, a loading rod 1 and a loading cap 6. The output end of the servo hydraulic machine 5 is connected to the loading cap 6 through the loading rod 1. The loading cap 6 is made of rubber. The loading cap 6 is located in the transparent test cylinder 17 and has an interference fit with the transparent test cylinder to achieve sealing and prevent water from flowing out of the gap between the loading cap 6 and the transparent test cylinder 17 during the pressurization process. The pressure adjustment accuracy of the servo hydraulic machine is 1Kpa.

[0047] In this embodiment, the heating device adopts electric heating, and the loading cap 6 also serves as a heating plate. The side of the heating plate is wrapped with a rubber ring. The heating plate is connected to the power supply 12 through a wire 10, and the temperature is controlled by a temperature controller 18. The upper surface of the loading plate is provided with a thermal insulation material, which can realize one-way heat conduction, that is, the temperature is conducted to the inside of the hydrophobic roadbed only through the bottom surface of the heating plate, which can avoid heat loss.

[0048] Furthermore, a water injection space 21 is reserved between the loading cap 6 and the filled hydrophobic roadbed sample, and a water pipe 4 is connected to the transparent test cylinder corresponding to the water injection space 21 .

[0049] In this embodiment, a water pump, a pressure gauge and a flow regulating valve 2 are arranged on the water pipe 4. Under the action of the water pump, the water in the water tank 3 is injected into the transparent test cylinder 17. The pressure gauge monitors the injected water pressure to ensure that the water pressure in the transparent test cylinder 17 remains consistent at the beginning of each test. A check valve is arranged at the position where the water pipe 4 is connected to the transparent test cylinder 1 to ensure that the water only flows along the water inlet and cannot flow back, because when the water flows back, the accuracy of the water pressure loading will be affected, and thus the accuracy of the experimental data is difficult to ensure.

[0050] In this embodiment, the temperature sensor, humidity sensor and displacement sensor are provided in multiple numbers and are evenly distributed in the height direction of the hydrophobic roadbed, and the data acquisition module 7 is connected to the data acquisition instrument 8 through a wire. Specifically, the temperature sensor, pressure sensor and displacement sensor are pre-buried in layers in the hydrophobic roadbed sample to be tested, that is, a temperature sensor, humidity sensor and displacement sensor are respectively provided at the same height in the hydrophobic roadbed. After the burying is completed, the wires of the sensors are uniformly led out close to the inner wall of the transparent test tube.

[0051] In this embodiment, the permeable stone can be made of natural colored permeable stone or adhesive. By utilizing its permeable characteristics, the results of water migration during the test can be observed (adding dye to the water to dye the water, and then injecting it into the transparent test tube through the water inlet module). When the water in the test tube migrates to the bottom of the sample with the gradually increasing water pressure, the water can be discharged through the permeable stone, effectively preventing water accumulation at the bottom of the sample, thereby improving the accuracy of the test data.

[0052] In this embodiment, the transparent test cylinder 17 is mounted on the base 13, a support rod 9 is mounted on the base 13 to support the top plate 19, the servo hydraulic machine 5 is fixed on the top plate 19, and the output end of the servo hydraulic machine 5 passes through the top plate and is connected to the loading rod 1 to achieve pressurization of the hydrophobic roadbed sample in the transparent test cylinder 17. Specifically, the support rod 9 can be a threaded rod, and the top plate 19 is fixed to the upper part of the support rod 9 through the upper and lower nuts 11.

[0053] In this embodiment, the hydrophobic roadbed sample 16 is various soils under different working conditions. Before the specific test, the original soil needs to be screened and dried, and the soil below 2 mm is taken as the test soil. According to the optimal moisture content and the test plan, the soil and the hydrophobic material are added to the soil, and it is stirred to be fully mixed. After the mixing is completed, the hydrophobic soil is added to the transparent test cylinder according to the on-site compaction design and compacted. After the sample is made, it needs to be left to stand for 24 hours to ensure that the materials are fully mixed.

[0054] The method of using the test system for testing the performance of hydrophobic roadbed provided in this embodiment is as follows:

[0055] Fill the hydrophobic roadbed sample to be tested into a transparent test cylinder and bury the sensor in advance, and connect the environmental loading module, water inlet module and data acquisition module;

[0056] During the test, the water inlet module is opened, and the water source flows into the transparent test cylinder along the water pipe through the flow regulating valve, and water is injected to a set height on the upper part of the hydrophobic roadbed sample after static maintenance. The flow regulating valve is closed to ensure that the water does not flow back. Among them, the height of the injected water is determined according to the height of the transparent test cylinder to ensure that the injected water is sufficient to reach the permeable stone of the transparent test cylinder.

[0057] Turn on the servo motor and pressurize the sample step by step. After each loading pressure increase, stabilize it for 2 minutes to observe the sample phenomenon. If the sample and the permeable stone do not change, continue to increase the pressure until water enters the permeable stone, that is, the color of the permeable stone changes;

[0058] During the test, if the influence of temperature on the sample is taken into consideration, it is only necessary to set the corresponding temperature through the temperature controller 18 according to the simulated ambient temperature, and heat the hydrophobic roadbed sample 16 through the heating plate on the loading cap 6. After the hydrophobic roadbed sample is heated to the set temperature, the loading cap 6 is raised to reserve a certain water injection space 21 for water injection.

[0059] The data acquisition module collects relevant temperature data, humidity data and displacement data during the test, and records the water inflow time of the permeable stone and the pressure applied by the pressure device at this time, and analyzes the performance of the hydrophobic roadbed sample based on the above data. Since the hydrophobic material inside the hydrophobic roadbed is equivalent to a layer of waterproof membrane, if water is simply injected above the hydrophobic roadbed, the water will not penetrate. Therefore, a pressure is applied to the water by a pressure device to allow the water to break through the waterproof membrane. The pressure that breaks through the waterproof membrane is the breakthrough pressure, and the breakthrough pressure can evaluate the waterproof performance of the hydrophobic roadbed. In addition, the performance of the waterproof membrane has certain differences at different temperatures, so a temperature sensor is set to obtain the performance of the hydrophobic roadbed at different temperatures (or the influence of temperature on the waterproof performance of the hydrophobic roadbed). The humidity sensor is used to measure the change law of the moisture content in the sample (when water breaks through the waterproof membrane and penetrates, the moisture content in the sample will change, so that the moisture content change can be observed more accurately). The displacement sensor is used to measure the displacement change of the soil inside the sample during the pressurization process or after the water breaks through the waterproof membrane. The water migration rate of the hydrophobic roadbed sample can be calculated based on the height of the hydrophobic roadbed sample and the time it takes for water to flow through the sample and enter the permeable stone.

[0060] According to the pressure applied by the pressurizing device, the temperature applied by the heating device, and the time when the color changes during water permeation, a fitting formula describing the hydrophobic performance of the hydrophobic roadbed sample can be obtained as follows:

[0061] BP=asin(bT)+cln(1+t)+dh e

[0062] Wherein, BP represents breakthrough pressure, that is, the pressure applied by the pressurizing device that can make water break through the hydrophobic material in the hydrophobic roadbed sample, in kPa; T is the heating temperature of the heating device, in °C; t is the time for the permeable stone to change color, in s; h is the thickness of the hydrophobic material, in cm; a, b, c, d, and e are all fitting constants.

[0063] The test system for hydrophobic roadbed performance testing provided in this embodiment can realize the performance test of the hydrophobic roadbed under different working conditions, and can realize the performance test of the hydrophobic roadbed under different working conditions, such as constant head pressurization, constant pressure constant head temperature change, etc., thereby realizing a comprehensive performance test of the hydrophobic roadbed.

[0064] Example 2

[0065] In a typical embodiment of the present invention, a test method for testing water inlet pressure of a hydrophobic roadbed is provided, which is implemented by using the visual test system described in Example 1, such as Figure 2 As shown, the following steps are included:

[0066] Fill the hydrophobic roadbed sample into a transparent test cylinder and perform compaction treatment;

[0067] The hydrophobic roadbed sample is heated to a set temperature by a heating device to simulate a real temperature environment;

[0068] Inject water of a set height into the transparent test cylinder through the water inlet module, and apply pressure through the pressure device until the color of the permeable stone changes;

[0069] The performance of the hydrophobic roadbed sample is obtained based on the collected test data.

[0070] Furthermore, the temperature distribution of the hydrophobic roadbed samples during the test was obtained through the collected temperature data, the water flow state in the hydrophobic roadbed samples during the test was obtained through the collected humidity data, and the deformation process of the hydrophobic roadbed samples during the test was obtained through the collected displacement data; the migration rate of water was obtained according to the time when the permeable stone changed color and the sample height.

[0071] In a specific embodiment, the transparent test cylinder is a cylindrical structure with a diameter of 60 cm and a height of 120 cm and has a temperature insulation effect.

[0072] Before the test begins, the filling sample needs to be prepared first. The soil is obtained from the engineering site, and then the soil is dried and sieved to retain soil with a particle size of less than 2 mm as the test material. This embodiment takes the silt in the Yellow River flooding area of ​​Shandong as an example for illustration. The moisture content of the silt on site is tested and it can be found that the moisture content is 12.1%, so the test sample also uses this moisture content. According to the test plan design, the compaction degree of the roadbed can be not compacted.

[0073] The hydrophobic material used is the hydrophobic material independently developed by the research group, and its components are sodium methyl silicate solution, heptadecafluorodecyltrimethoxysilane, dimethyldichlorosilane, ethylene glycol and nano-silica sol solution in a mass ratio of 5:3:3:1:100, which are evenly mixed and stirred to obtain a hydrophobic improved roadbed raw material; the hydrophobic material: soil: water = is configured in a mass ratio of 1:200:24.2, and it is sealed for 24 hours to ensure that the materials are evenly mixed.

[0074] Subsequently, it is filled into the transparent test cylinder in layers. During the filling process, various sensors are arranged according to the test design. Then it is compacted. The sensor wires are uniformly led out close to the inner wall of the loading barrel. Finally, the loading cap is installed on the top of the transparent loading cylinder.

[0075] During the test, the water inlet device is opened, and the water source flows into the interior of the acrylic plate cylinder along the water pipe through the flow regulating valve, and then water is added to the upper part of the sample after static curing to a height of 5 cm, and the flow regulating valve is closed to ensure that the water does not flow back under the action of the one-way valve;

[0076] During the test, the servo motor is turned on and the sample is pressurized step by step. After each loading pressure increase, the sample phenomenon is observed after stabilization for 2 minutes. If the sample and the permeable stone do not change, the pressure continues to be increased until water enters the permeable stone.

[0077] The following test data were obtained:

[0078] When the thickness of the hydrophobic roadbed sample material is 20 cm, the pressure device is pressurized to 500 KPa, and the sample temperature is 30 ° C, water enters the permeable stone after 600 s;

[0079] When the thickness of the hydrophobic roadbed sample material is 5 cm, the pressure device is pressurized to 200 KPa, and the sample temperature is 30 ° C, water enters the permeable stone after 600 s;

[0080] When the thickness of the hydrophobic roadbed sample material is 15 cm, the pressure device is pressurized to 500 KPa, and the sample temperature is 10 °C, water enters the permeable stone after 600 s;

[0081] When the thickness of the hydrophobic roadbed sample material is 30 cm, the pressure device is pressurized to 500 KPa, and the sample temperature is 30 ° C, water enters the permeable stone after 1200 s;

[0082] When the thickness of the hydrophobic roadbed sample material is 20 cm, the pressure device is pressurized to 400 KPa, and the sample temperature is 20°C, water enters the permeable stone after 800 seconds.

[0083] According to the pressure applied by the pressurizing device, the temperature applied by the heating device, and the time when the color changes during water permeation, a fitting formula describing the hydrophobic performance of the hydrophobic roadbed sample can be obtained as follows:

[0084] BP=-377.9563sin(0.0718T)-143.1261ln(1+t)+1147.7114h 0.1373

[0085] Wherein, BP represents breakthrough pressure, that is, the pressure applied by the pressure device to make water break through the hydrophobic material in the hydrophobic roadbed sample, in kPa; T is the heating temperature of the heating device, in °C; t is the time for the permeable stone to change color, in s; h is the thickness of the hydrophobic material, in cm.

[0086] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A test system for testing the performance of a hydrophobic roadbed, characterized in that: include: A transparent test cylinder filled with soil containing hydrophobic material to simulate a hydrophobic roadbed; The environmental loading module includes a pressurizing device and a heating device, which are used to apply pressure and temperature to the hydrophobic roadbed respectively; A water inlet module, comprising a water tank connected to a transparent test cylinder through a water pipe, for providing water inlet of a set height to the hydrophobic roadbed, wherein the water tank stores water dyed with a dye; A data acquisition module, including a temperature sensor, a humidity sensor, and a displacement sensor, is used to monitor the temperature, humidity, and displacement of the hydrophobic roadbed during the test; A permeable stone is arranged at the bottom of the transparent test cylinder, and whether the hydrophobic material in the hydrophobic roadbed is damaged is judged according to the color change of the permeable stone, and the relevant data is recorded to determine the performance of the hydrophobic roadbed.

2. The test system for testing the performance of a hydrophobic roadbed according to claim 1, characterized in that: The side wall of the transparent test tube is made of a transparent acrylic plate, the bottom surface of the transparent test tube is made of a thermal conductive plate, and the positions of the acrylic plate and the thermal conductive plate are sealed with a rubber sealing ring.

3. The test system for testing the performance of a hydrophobic roadbed according to claim 2, characterized in that: The heat conduction plate is made of a material selected from the group consisting of ceramic, copper, ceramic, aluminum and graphite, and the permeable stone is located above the heat conduction plate.

4. The test system for testing the performance of a hydrophobic roadbed according to claim 1, characterized in that: The pressurizing device comprises a servo hydraulic machine, a loading rod and a loading cap. The output end of the servo hydraulic machine is connected to the loading cap through the loading rod. The loading cap also serves as a heating plate. The side of the heating plate is wrapped by a rubber ring.

5. The test system for testing the performance of a hydrophobic roadbed according to claim 4, characterized in that: The heating plate is connected to a power source via a wire, and the temperature is controlled by a temperature controller.

6. The test system for testing the performance of a hydrophobic roadbed according to claim 4, characterized in that: A water injection space is reserved between the loading cap and the filled hydrophobic roadbed sample, and a water pipe is connected to the transparent test cylinder corresponding to the water injection space.

7. The test system for testing the performance of a hydrophobic roadbed according to claim 6, characterized in that: A water pump, a pressure gauge and a flow regulating valve are arranged on the water pipe.

8. The test system for testing the performance of a hydrophobic roadbed according to claim 1, characterized in that: The temperature sensors, humidity sensors and displacement sensors are all provided in plurality and are evenly distributed in the height direction within the hydrophobic roadbed.

9. A test method for testing water inlet pressure of a hydrophobic roadbed, using a test system as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Fill the hydrophobic roadbed sample into a transparent test cylinder and perform compaction treatment; The hydrophobic roadbed sample is heated to a set temperature by a heating device to simulate a real temperature environment; Inject water of a set height into the transparent test cylinder through the water inlet module, and apply pressure through the pressure device until the color of the permeable stone changes; The performance of the hydrophobic roadbed sample is obtained based on the collected test data.

10. The test method for testing water inlet pressure of a hydrophobic roadbed according to claim 9, characterized in that: The temperature distribution of the hydrophobic roadbed samples during the test was obtained through the collected temperature data, the water flow state in the hydrophobic roadbed samples during the test was obtained through the collected humidity data, and the deformation process of the hydrophobic roadbed samples during the test was obtained through the collected displacement data; the migration rate of water was obtained according to the time when the permeable stone color changed and the sample height; According to the pressure applied by the pressurizing device, the temperature applied by the heating device, and the time when the color changes during water permeation, a fitting formula describing the hydrophobic performance of the hydrophobic roadbed sample can be obtained as follows: BP=asin(bT)+cln(1+t)+dh e Wherein, BP represents breakthrough pressure, that is, the pressure applied by the pressurizing device that can make water break through the hydrophobic material in the hydrophobic roadbed sample, in kPa; T is the heating temperature of the heating device, in °C; t is the time for the permeable stone to change color, in s; h is the thickness of the hydrophobic material, in cm; a, b, c, d, and e are all fitting constants.

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