Testing device and method for evaluating salt corrosion damage of asphalt mixture

Abstract

The invention discloses a test device and method for evaluating salt corrosion damage of an asphalt mixture, and relates to the technical field of asphalt mixture test devices.The technical scheme includes that the test device comprises a test box, a test box door is rotatably connected to the front end of the test box, a supply shell is fixedly connected to the upper portion of the test box, and a mixing cavity is formed in the supply shell; a first motor is arranged on the upper portion of the mixing cavity, mixing fan blades are arranged at the output end of the first motor, a pressure pump is arranged on the left side of the mixing cavity, a conveying pipe is fixedly connected to the left side of the pressure pump, and a telescopic pipe is fixedly connected to the lower portion of the conveying pipe. After being filtered by multiple filter membranes in the conveying pipe, the salt solution can be filtered, and the high-pressure salt solution can generate an oscillation effect through the oscillation cavity arranged in the oscillation shell, so that the salt solution is refined into smaller fog drops, and continuous and uniform salt mist can be sprayed out by the spray head.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt mixture test devices, and particularly relates to a test device and method for evaluating the salt corrosion damage of asphalt mixtures. Background Art

[0002] In vast salt lake and saline soil areas, the water on highway asphalt pavements often exists in the form of salt solutions. These salt solutions will reduce the durability of asphalt pavements under the action of vehicle loads. Traditional evaluation methods for water damage of asphalt mixtures, such as the immersion Marshall test and freeze-thaw splitting test, mainly evaluate the action of static water erosion, and there is relatively little research on dynamic water erosion. Therefore, in order to more accurately simulate actual pavement conditions and evaluate the salt corrosion damage of asphalt mixtures, a special test device has been developed. This device can simulate different salt corrosion conditions and comprehensively evaluate the road performance of asphalt mixtures, providing an important means for improving the water damage resistance of asphalt mixtures and the durability of pavement structures.

[0003] However, in the actual use process of existing devices, most of them conduct tests by spraying salt solutions through nozzles to make them contact with asphalt mixtures. However, for salt solutions with relatively high concentrations, due to their excessive viscosity, it is difficult to maintain a stable salt mist posture continuously, resulting in the salt solutions being difficult to act uniformly on the surface of asphalt mixtures and reducing the accuracy of test results. Therefore, a test device and method for evaluating the salt corrosion damage of asphalt mixtures are proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings in the prior art that most tests are conducted by spraying salt solutions through nozzles to make them contact with asphalt mixtures, but for salt solutions with relatively high concentrations, due to their excessive viscosity, it is difficult to maintain a stable salt mist posture continuously, resulting in the salt solutions being difficult to act uniformly on the surface of asphalt mixtures and reducing the accuracy of test results, and to propose a test device and method for evaluating the salt corrosion damage of asphalt mixtures.

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

[0006] An experimental device and method for evaluating the salt corrosion damage of asphalt mixtures, including a test chamber. A test chamber door is rotatably connected to the front end of the test chamber. A supply housing is fixedly connected to the upper part of the test chamber. A mixing chamber is provided inside the supply housing. A first motor is arranged above the mixing chamber. A mixing fan blade is arranged at the output end of the first motor. A pressure pump is arranged on the left side of the mixing chamber. A conveying pipe is fixedly connected to the left side of the pressure pump. A telescopic pipe is fixedly connected to the lower part of the conveying pipe. A vibration housing is fixedly connected to the lower part of the telescopic pipe. A vibration chamber is arranged inside the vibration housing. Two rectifying blocks are fixedly connected inside the vibration chamber. A spray head is fixedly connected to the lower part of the vibration housing. A regulating valve is arranged inside the spray head. A feeding port is arranged above the mixing chamber. Multiple filter membranes are arranged inside the conveying pipe. The material of the test chamber door is transparent.

[0007] An adjusting mechanism is arranged on one side of the vibration housing. The adjusting mechanism includes an adjusting frame fixedly connected inside the test chamber. A second motor is arranged below the adjusting frame. A first gear is arranged at the output end of the second motor. The first gear is meshed with a second gear. A rotating shaft is fixedly connected to the side of the second gear close to the adjusting frame. A connecting plate is fixedly connected to the lower part of the rotating shaft. The connecting plate is fixedly connected with the vibration housing. The salt solution in the mixing chamber is pumped into the vibration housing by the pressure pump. After the salt solution vibrates in the vibration housing, it is sprayed out in the form of salt mist through the spray head. By starting the second motor to drive the connecting plate to rotate, the rotation of the connecting plate drives the vibration housing to rotate, thereby adjusting the spraying angle of the spray head. A temperature and humidity controller is arranged inside the test chamber. The temperature and humidity inside the test chamber are adjusted through the controller. A placing plate is also arranged inside the test chamber. A transmission mechanism is arranged below the placing plate. Rotating mechanisms are symmetrically arranged on both sides of the placing plate. Four fixing mechanisms are fixedly connected to the upper part of the placing plate.

[0008] The above technical solution further includes:

[0009] The transmission mechanism includes a test bench fixedly connected inside the test chamber. A transmission housing is fixedly connected to one side of the test bench. A third motor is arranged inside the transmission housing. A transmission component is arranged at the output end of the third motor.

[0010] The transmission component includes a lead screw arranged at the output end of the third motor. The lead screw is rotatably connected to the test bench. The lead screw is threadedly connected with a transmission plate.

[0011] The transmission plate is slidably connected to the test bench. Two rotating mechanisms are fixedly connected to the upper part of the transmission plate.

[0012] The rotating mechanism includes a rotating housing fixedly connected to the upper part of the transmission plate. A fourth motor is arranged inside the rotating housing. A rotating component is arranged at the output end of the fourth motor.

[0013] The rotating assembly includes a third gear disposed at the output end of a fourth motor. The third gear is meshed with a fourth gear, and the fourth gear is rotatably connected to a rotating housing. A placement plate is fixedly connected to the side of the fourth gear away from the rotating housing.

[0014] The fixing mechanism includes four fixing housings fixedly connected to the upper part of the placement plate. A fixing block is slidably connected to the upper part of the fixing housing.

[0015] A threaded rod is threadedly connected to the upper part of the fixing block. The bottom of the threaded rod is rotatably connected to the placement plate. A rotating rod is fixedly connected to the upper part of the threaded rod. An anti-slip layer is provided at the lower part of the fixing block.

[0016] A method for using a test device for evaluating the salt corrosion damage of asphalt mixtures includes the following steps:

[0017] Step 1: Stir and mix a salt solution with a specified concentration in the mixing chamber according to the experimental requirements. After preparation, place the asphalt mixture on the upper part of the placement plate and fix it through the fixing mechanism.

[0018] Step 2: Adjust and control the temperature and humidity during the test through the temperature and humidity controller inside the test chamber. Then, adjust the position and angle of the asphalt mixture fixed on the placement plate through the transmission mechanism and the rotating mechanism.

[0019] Step 3: Start the adjustment mechanism. Drive the oscillation housing to rotate through the adjustment mechanism, thereby adjusting the spraying angle of the nozzle so that the salt solution can be accurately sprayed onto the surface of the asphalt mixture.

[0020] Step 4: Close the door of the test chamber. Then start the pressure pump. Drive the salt solution in the mixing chamber into the oscillation housing through the pressure pump. The high-pressure salt solution generates an oscillation effect through the oscillation chamber provided in the oscillation housing, refining the salt solution into finer droplets, enabling the nozzle to spray a continuous and uniform salt mist. During the test process, regularly observe the changes in the color, cracks, spalling, etc. on the surface of the specimen.

[0021] The present invention has the following beneficial effects:

[0022] 1. In the present invention, when the device is in use, the salt solution prepared in the mixing chamber can be pressurized and fed into the delivery pipe through the pressure pump. After being filtered by multiple filter membranes in the delivery pipe, the salt solution can be filtered. The high-pressure salt solution can generate an oscillation effect through the oscillation chamber provided in the oscillation housing, thereby refining the salt solution into finer droplets, ensuring that the nozzle can spray a continuous and uniform salt mist, effectively ensuring that the salt mist can act uniformly on the surface of the asphalt mixture during the test. Moreover, through the adjustment mechanism, it can also be adjusted correspondingly according to the inclination angle of the asphalt mixture, enabling the salt mist to accurately and uniformly cover the surface of the asphalt mixture, improving the accuracy of the test.

[0023] 2. In the present invention, before the test starts, the asphalt mixture can be placed on the surface of the placement plate, and then the position of the asphalt mixture is fixed by the fixing mechanism, effectively ensuring the stability of the asphalt mixture during the test. Moreover, through the transmission mechanism arranged under the placement plate and the rotation mechanisms arranged on both sides, the height and inclination angle of the placement plate can also be adjusted to ensure that the distance and angle between the asphalt mixture and the nozzle meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a test device for evaluating the salt corrosion damage of asphalt mixtures proposed by the present invention;

[0025] Figure 2 It is a front view of the overall structure of the device in the present invention;

[0026] Figure 3 It is a schematic diagram of the connection relationship of the oscillation housing in the present invention;

[0027] Figure 4 It is a schematic diagram of the internal structure of the oscillation housing in the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the adjustment mechanism in the present invention;

[0029] Figure 6 It is a schematic diagram of the internal structure of the transmission housing in the present invention;

[0030] Figure 7 It is a schematic diagram of the internal structure of the rotation housing in the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the fixing mechanism in the present invention.

[0032] In the figure: 1, test box; 2, test box door; 3, supply housing; 4, first motor; 5, mixing fan blade; 6, pressure pump; 7, delivery pipe; 8, oscillation housing; 9, test bench; 10, transmission housing; 11, placement plate; 12, rotation housing; 13, adjustment frame; 14, connecting plate; 15, telescopic pipe; 16, nozzle; 17, regulating valve; 18, oscillation cavity; 19, rectifying block; 20, second motor; 21, first gear; 22, second gear; 23, rotating shaft; 24, transmission plate; 25, lead screw; 26, third motor; 27, fixed housing; 28, fourth motor; 29, third gear; 30, fourth gear; 31, fixed block; 32, threaded rod; 33, rotating rod. DETAILED DESCRIPTION OF THE INVENTION

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] As Figures 1-8 shown, a test device and method for evaluating the salt corrosion damage of asphalt mixture proposed by the present invention includes a test chamber 1. A test chamber door 2 is rotatably connected to the front end of the test chamber 1. A supply housing 3 is fixedly connected to the upper part of the test chamber 1. A mixing chamber is provided inside the supply housing 3. A first motor 4 is provided above the mixing chamber. A mixing fan blade 5 is provided at the output end of the first motor 4. A pressure pump 6 is provided on the left side of the mixing chamber. A conveying pipe 7 is fixedly connected to the left side of the pressure pump 6. A telescopic pipe 15 is fixedly connected to the lower part of the conveying pipe 7. An oscillating housing 8 is fixedly connected to the lower part of the telescopic pipe 15. An oscillation chamber 18 is provided inside the oscillating housing 8. Two rectifying blocks 19 are fixedly connected inside the oscillation chamber 18. A spray head 16 is fixedly connected to the lower part of the oscillating housing 8. A regulating valve 17 is provided inside the spray head 16. A feeding port is provided above the mixing chamber. Multiple filter membranes are provided inside the conveying pipe 7. The material of the test chamber door 2 is transparent;

[0036] An adjusting mechanism is provided on one side of the oscillating housing 8. The adjusting mechanism includes an adjusting frame 13 fixedly connected inside the test chamber 1. A second motor 20 is provided below the adjusting frame 13. A first gear 21 is provided at the output end of the second motor 20. The first gear 21 is meshed with a second gear 22. A rotating shaft 23 is fixedly connected to the side of the second gear 22 close to the adjusting frame 13. A connecting plate 14 is fixedly connected to the lower part of the rotating shaft 23. The connecting plate 14 is fixedly connected to the oscillating housing 8. The salt solution in the mixing chamber is pumped into the oscillating housing 8 by the pressure pump 6. After the salt solution oscillates in the oscillating housing 8, it is sprayed out in the form of salt mist through the spray head 16. By starting the second motor 20 to drive the connecting plate 14 to rotate, the rotation of the connecting plate 14 drives the oscillating housing 8 to rotate, thereby adjusting the spraying angle of the spray head 16. A temperature and humidity controller is provided inside the test chamber 1. The temperature and humidity inside the test chamber 1 are adjusted through the controller. A placing plate 11 is also provided inside the test chamber 1. A transmission mechanism is provided below the placing plate 11. Rotating mechanisms are symmetrically provided on both sides of the placing plate 11. Four fixing mechanisms are fixedly connected to the upper part of the placing plate 11.

[0037] In this embodiment, when the device is in use, the raw material of the salt solution can be put into the mixing chamber through the feeding port arranged at the upper part of the mixing chamber. Then, the first motor 4 is started. By driving the mixing fan blade 5 to rotate through the first motor 4, the raw materials can be effectively mixed to form a salt solution. Subsequently, after fixing and adjusting the position of the asphalt mixture, the test chamber door 2 is closed. The temperature and humidity controller arranged inside the test chamber 1 is started, and the temperature and humidity inside the test chamber 1 are adjusted through the controller. Then, the second motor 20 is started. By driving the first gear 21 to rotate through the second motor 20, the rotation of the first gear 21 drives the meshing-connected second gear 22 to rotate. The rotation of the second gear 22 can drive the fixedly connected rotating shaft 23 to rotate. By the rotation of the rotating shaft 23, the fixedly connected connecting plate 14 is driven to rotate, and further drives the oscillating housing 8 fixedly connected to the connecting plate 14 to rotate. Finally, the spraying angle of the nozzle 16 is adjusted so that the nozzle 16 can be correspondingly adjusted according to the inclination angle of the asphalt mixture, ensuring that the salt mist can accurately and evenly cover the surface of the asphalt mixture, and improving the accuracy of the test.

[0038] During the test, when the pressure pump 6 is started, the salt solution configured in the mixing chamber can be pressurized and fed into the delivery pipe 7. After being filtered by multiple filters in the delivery pipe 7, the salt solution can be filtered. The high-pressure salt solution can generate an oscillation effect through the oscillation chamber 18 arranged in the oscillating housing 8, thereby refining the salt solution into finer droplets, ensuring that the nozzle 16 can spray a continuous and uniform salt mist, and effectively ensuring that the salt mist can act evenly on the surface of the asphalt mixture during the test. During the test process, the changes in the color, cracks, peeling, etc. of the specimen surface can be observed regularly. The mass loss rate can be measured by measuring the mass change of the specimen before and after the experiment. The mass loss rate directly reflects the mass loss of the asphalt mixture under salt fog erosion. The volume change rate can evaluate its volume stability. The change in surface morphology can visually reflect the surface damage under salt fog erosion by observing the phenomena such as the color, cracks, peeling, etc. of the specimen surface.

[0039] Embodiment 2

[0040] As Figures 1-8 shown, based on Embodiment 1, the transmission mechanism includes a test bench 9 fixedly connected inside the test chamber 1. One side of the test bench 9 is fixedly connected with a transmission housing 10. A third motor 26 is arranged inside the transmission housing 10. A transmission component is arranged at the output end of the third motor 26. The transmission component includes a lead screw 25 arranged at the output end of the third motor 26. The lead screw 25 is rotatably connected to the test bench 9, and a transmission plate 24 is threadedly connected to the lead screw 25.

[0041] The transmission plate 24 is slidably connected to the test bench 9. Two rotating mechanisms are fixedly connected to the upper part of the transmission plate 24. The rotating mechanism includes a rotating housing 12 fixedly connected to the upper part of the transmission plate 24. A fourth motor 28 is arranged inside the rotating housing 12. A rotating assembly is arranged at the output end of the fourth motor 28. The rotating assembly includes a third gear 29 arranged at the output end of the fourth motor 28. The third gear 29 is meshed and connected with a fourth gear 30. The fourth gear 30 is rotatably connected to the rotating housing 12. A placing plate 11 is fixedly connected to the side of the fourth gear 30 away from the rotating housing 12.

[0042] The fixing mechanism includes four fixing housings 27 fixedly connected to the upper part of the placing plate 11. A fixing block 31 is slidably connected to the upper part of the fixing housing 27. A threaded rod 32 is threadedly connected to the upper part of the fixing block 31. The bottom of the threaded rod 32 is rotatably connected to the placing plate 11. A rotating rod 33 is fixedly connected to the upper part of the threaded rod 32. An anti-slip layer is arranged at the lower part of the fixing block 31.

[0043] In this embodiment, before the test starts, the asphalt mixture can be placed on the surface of the placing plate 11. Subsequently, rotate the rotating rod 33. The rotation of the rotating rod 33 can drive the fixedly connected threaded rod 32 to rotate. The rotation of the threaded rod 32 can drive the threadedly connected fixing block 31 to move downward, thereby fixing the position of the asphalt mixture, effectively ensuring the stability of the asphalt mixture during the test. Moreover, by starting the third motor 26, the lead screw 25 can be driven to rotate. The rotation of the lead screw 25 can drive the threadedly connected transmission plate 24 to move up and down, thereby adjusting the height of the placing plate 11. By starting the fourth motor 28, the third gear 29 can be driven to rotate. The rotation of the third gear 29 drives the meshed fourth gear 30 to rotate. The rotation of the fourth gear 30 can drive the fixedly connected placing plate 11 to rotate, thereby adjusting the inclination angle of the placing plate 11 to ensure that the distance and angle between the asphalt mixture and the nozzle 16 meet the requirements.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An experimental device for evaluating the salt corrosion damage of asphalt mixtures, comprising a test box (1), characterized in that, A test chamber door (2) is rotatably connected to the front end of the test chamber (1). A supply housing (3) is fixedly connected to the upper part of the test chamber (1). A mixing chamber is provided inside the supply housing (3). A first motor (4) is provided above the mixing chamber. A mixing fan blade (5) is provided at the output end of the first motor (4). A pressure pump (6) is provided on the left side of the mixing chamber. A delivery pipe (7) is fixedly connected to the left side of the pressure pump (6). A telescopic pipe (15) is fixedly connected to the lower part of the delivery pipe (7). A shock housing (8) is fixedly connected to the lower part of the telescopic pipe (15). A shock chamber (18) is provided inside the shock housing (8). Two rectifying blocks (19) are fixedly connected inside the shock chamber (18). A spray head (16) is fixedly connected to the lower part of the shock housing (8). A regulating valve (17) is provided inside the spray head (16). An adjusting mechanism is provided on one side of the shock housing (8). The adjusting mechanism includes an adjusting frame (13) fixedly connected inside the test chamber (1). A second motor (20) is provided below the adjusting frame (13). A first gear (21) is provided at the output end of the second motor (20). The first gear (21) is meshed with a second gear (22). A rotating shaft (23) is fixedly connected to the side of the second gear (22) close to the adjusting frame (13). A connecting plate (14) is fixedly connected to the lower part of the rotating shaft (23). The connecting plate (14) is fixedly connected to the shock housing (8). The salt solution in the mixing chamber is pumped into the shock housing (8) by the pressure pump (6). After the salt solution oscillates in the shock housing (8), it is sprayed out in the form of salt mist through the spray head (16). By starting the second motor (20) to drive the connecting plate (14) to rotate, the connecting plate (14) rotates to drive the shock housing (8) to rotate, thereby adjusting the spraying angle of the spray head (16). A temperature and humidity controller is provided inside the test chamber (1). The temperature and humidity inside the test chamber (1) are adjusted through the controller. A placement plate (11) is also provided inside the test chamber (1). A transmission mechanism is provided below the placement plate (11). Rotating mechanisms are symmetrically provided on both sides of the placement plate (11). Four fixing mechanisms are fixedly connected to the upper part of the placement plate (11).

2. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 1, characterized in that, The transmission mechanism includes a test bench (9) fixedly connected inside the test chamber (1). A transmission housing (10) is fixedly connected to one side of the test bench (9). A third motor (26) is provided inside the transmission housing (10). A transmission component is provided at the output end of the third motor (26).

3. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 2, characterized in that, The transmission component includes a lead screw (25) provided at the output end of the third motor (26). The lead screw (25) is rotatably connected to the test bench (9). The lead screw (25) is threadedly connected to a transmission plate (24).

4. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 3, characterized in that, The transmission plate (24) is slidably connected to the test bench (9). Two rotating mechanisms are fixedly connected to the upper part of the transmission plate (24).

5. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 1, wherein, The rotating mechanism includes a rotating housing (12) fixedly connected to the upper part of the transmission plate (24). A fourth motor (28) is arranged inside the rotating housing (12), and a rotating assembly is arranged at the output end of the fourth motor (28).

6. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 5, characterized in that, The rotating assembly includes a third gear (29) arranged at the output end of the fourth motor (28). The third gear (29) is meshed with a fourth gear (30). The fourth gear (30) is rotatably connected to the rotating housing (12). A placement plate (11) is fixedly connected to the side of the fourth gear (30) away from the rotating housing (12).

7. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 1, characterized in that, The fixing mechanism includes four fixing housings (27) fixedly connected to the upper part of the placement plate (11). A fixing block (31) is slidably connected to the upper part of the fixing housing (27).

8. The test device for evaluating the salt corrosion damage of asphalt mixture according to claim 7, characterized in that, A threaded rod (32) is threadedly connected to the upper part of the fixing block (31). The bottom of the threaded rod (32) is rotatably connected to the placement plate (11). A rotating rod (33) is fixedly connected to the upper part of the threaded rod (32).

9. The method of using a test device for evaluating the salt corrosion damage of asphalt mixture according to claim 1, characterized in that, It includes the following steps: Step 1: Stir and mix a salt solution with a specified concentration in the mixing chamber according to the experimental requirements. After completion of the preparation, place the asphalt mixture on the upper part of the placement plate (11) and fix it through the fixing mechanism. Step 2: Adjust and control the temperature and humidity during the test through the temperature and humidity controller inside the test chamber (1). Then, adjust the position and angle of the asphalt mixture fixed on the placement plate (11) through the transmission mechanism and the rotating mechanism. Step 3: Start the adjustment mechanism, drive the oscillation housing (8) to rotate through the adjustment mechanism, so as to adjust the spraying angle of the spray head (16), so that the salt solution can be accurately sprayed onto the surface of the asphalt mixture. Step 4: Close the test chamber door (2), and then start the pressure pump (6). Drive the salt solution in the mixing chamber into the oscillation housing (8) through the pressure pump (6). The high-pressure salt solution generates an oscillation effect through the oscillation housing (8), and the salt solution is refined into finer droplets, so that the spray head (16) can spray a continuous and uniform salt mist. During the test process, regularly observe the changes in the color, cracks, peeling, etc. on the surface of the specimen.

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