Test device for salt erosion of coastal asphalt pavement under simulated hot and humid environment

Abstract

The utility model discloses a kind of test devices of simulating salt erosion of coastal asphalt pavement under hot and humid environment, belong to road engineering detection technical field.The device includes test box, control box and spraying system;The spraying system is provided with multiple spray nozzles, and the spray nozzle is located at the top of test box;UV lamp tube, salinity sensor, air heater and sample placing table are arranged in the test box, the UV lamp tube is evenly arranged below spray nozzle, and is parallel and staggered with spray nozzle arrangement.Said sample placing table is located at 20 cm~30 cm from the bottom in test box, the salinity sensor is fixed to 10 cm from the bottom in test box, and the air heater is arranged on the inner side wall of test box and above sample placing table;The control box includes power switch, spraying controller, temperature regulator, ultraviolet irradiation regulator, salinity concentration display screen and cycle number setter.

Description

Technical Field

[0001] This utility model belongs to the field of road engineering testing technology, and relates to a test device for simulating salt erosion of coastal asphalt pavement under humid and hot conditions. Background Technology

[0002] Sea salt erosion is a key contributing factor to early-stage defects such as rutting and loosening in coastal asphalt pavements. This erosion process is influenced by a combination of factors, including temperature, sunlight, and rainfall, with the most significant damage induced by wet-dry cycles: rainwater infiltration promotes salt penetration into the pavement structure, while high temperatures and ultraviolet radiation trigger salt crystal expansion and chemical erosion, inducing microcracks and accelerating interlayer delamination. This cyclical effect accelerates structural damage and exacerbates material aging, leading to a decline in mechanical properties. Therefore, simulating the multi-factor cyclic effects of saltwater erosion and high-temperature-ultraviolet radiation under wet-dry conditions can realistically reproduce the damage mechanisms of the natural environment, providing theoretical support for optimizing salt-resistant pavement materials.

[0003] Existing technologies, such as the patent with publication number CN209167044U entitled "A Simulation Device for Salt Erosion and Dynamic Water Erosion of Asphalt Mixture," apply the erosion medium to the specimen by setting up an alternating stress loading device, a solution circulation pipe, and a drainage pipe to simulate salt erosion and dynamic erosion of asphalt pavement. However, it lacks the simulation and control of other factors such as high temperature and ultraviolet radiation during the salt erosion process. The patent with publication number CN119246285A entitled "Test Device and Test Method for Simulating Actual Dynamic Water Erosion Behavior of Asphalt Pavement" simulates the dynamic water erosion behavior of asphalt pavement by setting up an erosion unit and a power control box, but it is not specifically designed for salt erosion and lacks the simulation and control of other factors such as high temperature and ultraviolet radiation.

[0004] Existing devices simulate the influencing factors of salt corrosion on asphalt pavements, including water and temperature. Therefore, the structural design of the test device mainly includes a dynamic water scouring unit and a heating unit. However, actual salt corrosion is also affected by other factors such as ultraviolet radiation. The existing device's structural design for salt corrosion simulation tests is not comprehensive enough. Utility Model Content

[0005] To address the shortcomings of existing technologies and better simulate the multi-factor environmental effects experienced by coastal asphalt pavements during actual service, a test device was designed and developed that can realistically simulate the multi-factor cycle of dynamic water, salt corrosion, and photothermal effects on coastal asphalt pavements by introducing three environmental factors: salt water, temperature, and ultraviolet radiation. This solves the problem that the existing devices are not comprehensive enough in their structural design for salt corrosion simulation tests.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a test device for simulating salt erosion of coastal asphalt pavement under humid and hot conditions, including a test chamber, a control box, and a spraying system;

[0007] The spray system is equipped with multiple spray nozzles, which are located on the top of the test chamber;

[0008] The test chamber is equipped with UV lamps, a salinity sensor, an air heater, and a sample placement platform. The UV lamps are evenly arranged below the spray nozzles, parallel to and staggered from them. The sample placement platform is located 20 cm to 30 cm from the bottom of the test chamber. The salinity sensor is fixed 10 cm from the bottom of the test chamber. The air heater is located on the inner side wall of the test chamber and above the sample placement platform.

[0009] The control box includes a power switch, a spray controller, a temperature regulator, an ultraviolet radiation regulator, a salinity concentration display screen, and a cycle number setting device.

[0010] The test chamber is equipped with a lid on top.

[0011] The spraying system also includes an inlet pipe, an outlet pipe, and a circulating water pump. One end of the inlet pipe extends into the bottom of the test chamber, and the other end is connected to the circulating water pump outside the test chamber. One end of the outlet pipe is connected to the circulating water pump, and the other end is located at the top of the test chamber. The top of the test chamber has evenly distributed outlet branch pipes that are connected to the outlet pipe, and the bottom of the outlet branch pipes has evenly distributed spray nozzles.

[0012] Both the inlet pipe and the outlet pipe are made of DN32 type pipe.

[0013] The lid is made of transparent acrylic impact-resistant sheet with a thickness of 5 mm.

[0014] The test chamber uses PVA board with a thickness of 5 mm.

[0015] This utility model has the following beneficial effects:

[0016] 1. In specific operation, the test device of this application can precisely control the spray flow rate and time of the asphalt specimen to be tested by the spray controller; through the UV lamp and its controller, the air heater and its controller, the ultraviolet irradiation intensity, temperature effect and time can be accurately controlled; through the cycle number controller, the number of cycles of dynamic water-salt erosion-photothermal action can be precisely controlled, which can simulate the salt erosion behavior of coastal asphalt pavement under humid and hot conditions.

[0017] 2. The test device of this application, through the spray system, UV lamps and air heater, simulates the multi-factor coupling effect of salt water erosion and high temperature-ultraviolet radiation under dry and wet cycle conditions. It can more realistically simulate the damage process of road surface under natural environment, thus providing a more comprehensive test basis for studying the salt erosion damage characteristics of asphalt mixture under complex environmental conditions, and also providing a scientific basis for the design and improvement of road materials. Its structural design is more comprehensive and reasonable, and the test results are more realistic. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the experimental device described in this utility model;

[0019] Figure 2 This is a side view of the experimental device described in this utility model;

[0020] Figure 3 This is a top view of the test apparatus described in this utility model;

[0021] In the diagram: 1. Test chamber, 2. Sample placement platform, 3. Salinity sensor, 4. Air heater, 5. UV lamp, 6. Spray nozzle, 7. Chamber lid, 8. Specimen, 9. Circulating water pump, 10. Inlet pipe, 11. Outlet pipe, 12. Control box, 13. Power switch, 14. Spray controller, 15. Salinity concentration display screen, 16. Temperature controller, 17. UV irradiation controller, 18. Cycle number setting device, 19. Outlet branch pipe. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] like Figures 1 to 3 As shown, this application provides a test device for simulating salt erosion of coastal asphalt pavement under humid and hot conditions, including a test chamber 1, a control box 12 and a spraying system;

[0024] The spray system is equipped with multiple spray nozzles 6, which are located on the top of the test chamber 1;

[0025] The test chamber 1 is equipped with UV lamps 5, a salinity sensor 3, an air heater 4, and a sample placement platform 2. The UV lamps 5 are evenly arranged below the spray nozzles 6, parallel to and staggered from the spray nozzles 6. The sample placement platform 2 is located 20 cm to 30 cm from the bottom of the test chamber 1. The salinity sensor 3 is fixed 10 cm from the bottom of the test chamber 1. The air heater 4 is located on the inner side wall of the test chamber 1 and above the sample placement platform 2. The top of the test chamber 1 is equipped with a lid 7. The test chamber 1 is made of PVA board with a thickness of 5 mm, which can withstand large loads and impacts and has good corrosion resistance. The lid 7 is made of transparent acrylic impact-resistant board with a thickness of 5 mm, which can seal and insulate the test chamber 1.

[0026] The control box 12 includes a power switch 13, a spray controller 14, a temperature regulator 16, an ultraviolet irradiation regulator 17, a salinity concentration display screen 15, and a cycle number setting device 18. The spray controller 14 can adjust the spray water pressure and time of the spray system. The temperature regulator 16 controls the air heater 4 and can set the temperature range of 30℃ to 60℃ and the temperature control time. The ultraviolet irradiation regulator 17 can adjust the irradiation intensity and time of the UV lamp tube 5. The salinity concentration display screen 15 can monitor the concentration of the brine solution in real time. The cycle number setting device 18 can set the cycle number of the air heater 4, the UV lamp tube 5, and the spray system.

[0027] The spray system also includes an inlet pipe 10, an outlet pipe 11, and a circulating water pump 9. One end of the inlet pipe 10 extends into the bottom of the test chamber 1, and the other end is connected to the circulating water pump 9 outside the test chamber 1. One end of the outlet pipe 11 is connected to the circulating water pump 9, and the other end is located at the top of the test chamber 1. 5 cm below the top of the test chamber 1, there are evenly distributed outlet branch pipes 19 that communicate with the outlet pipe 11. Spray nozzles 6 are evenly distributed at the bottom of the outlet branch pipes 19. Both the inlet pipe 10 and the outlet pipe 11 are DN32 type pipes.

[0028] The specific operating procedure for the experimental setup in this application is as follows:

[0029] (1) Fix the pre-prepared asphalt mixture specimen 8 on the sample placement platform 2 inside the test chamber 1, ensuring that the distance between specimens 8 is not less than 2 cm. Then inject the prepared salt water solution into the bottom of the test chamber 1. The solution height is controlled to be 3 cm below the sample placement platform 2 and above the salinity sensor 3. Cover the test chamber 7 and prepare for the test.

[0030] (2) Set the required spray flow rate and spray time for the test through the spray controller 14, and select an appropriate spray nozzle 6 to ensure the required spray pressure for the test;

[0031] (3) Set the required temperature and duration of the experiment using the temperature controller 16; (4) Set the required UV intensity and UV irradiation time using the UV irradiation controller 17.

[0032] (5) Set the required number of cycles for the experiment using the cycle number setter 18;

[0033] (6) To begin the test, the asphalt mixture specimen 8 is first sprayed. After the set spraying time is reached, the spraying system automatically stops. Then, the air heater 4 and UV lamp 5 are turned on until the set action time is reached, completing one test cycle. Repeat the above cycle process until the set number of cycles is reached, then turn off the test device.

[0034] The embodiments of this utility model are merely preferred examples and are not intended to limit its scope of protection; therefore, all equivalent modifications based on the structure, shape and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A test apparatus for simulating salt erosion of coastal asphalt pavements under humid and hot conditions, characterized in that: Includes a test chamber, control box, and spray system; The spray system is equipped with multiple spray nozzles, which are located on the top of the test chamber; The test chamber is equipped with UV lamps, a salinity sensor, an air heater, and a sample placement platform. The UV lamps are evenly arranged below the spray nozzles, parallel to and staggered from the spray nozzles. The sample placement platform is located 20 cm to 30 cm from the bottom of the test chamber. The salinity sensor is fixed 10 cm from the bottom of the test chamber. The air heater is located on the inner side wall of the test chamber and above the sample placement platform. The control box includes a power switch, a spray controller, a temperature regulator, an ultraviolet radiation regulator, a salinity concentration display screen, and a cycle number setting device.

2. The experimental apparatus for simulating salt erosion of coastal asphalt pavement under humid and hot conditions according to claim 1, characterized in that: The test chamber is equipped with a lid on top.

3. The experimental apparatus for simulating salt erosion of coastal asphalt pavement under humid and hot conditions according to claim 1, characterized in that: The spraying system also includes an inlet pipe, an outlet pipe, and a circulating water pump. One end of the inlet pipe extends into the bottom of the test chamber, and the other end is connected to the circulating water pump outside the test chamber. One end of the outlet pipe is connected to the circulating water pump, and the other end is located at the top of the test chamber. The top of the test chamber has evenly distributed outlet branch pipes that are connected to the outlet pipe, and the bottom of the outlet branch pipes has evenly distributed spray nozzles.

4. The experimental apparatus for simulating salt erosion of coastal asphalt pavement under humid and hot conditions according to claim 3, characterized in that: Both the inlet pipe and the outlet pipe are made of DN32 type pipe.

5. The experimental apparatus for simulating salt erosion of coastal asphalt pavement under humid and hot conditions according to claim 1, characterized in that: The lid is made of transparent acrylic impact-resistant sheet with a thickness of 5 mm.

6. The experimental apparatus for simulating salt erosion of coastal asphalt pavement under humid and hot conditions according to claim 1, characterized in that: The test chamber is made of PVA board with a thickness of 5 mm.

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