An apparatus and method for evaluating the aging depth of asphalt pavement

Abstract

A device and method for evaluating the aging depth of asphalt pavement includes: a joint sealing tape disposed at the top of an evaluation box, with one end of the tape connected to a driving component, allowing the tape to move or stop selectively relative to the evaluation box via the driving component; an evaluation component disposed at the bottom of the evaluation box, including a support member slidably connected to the evaluation box, positioned in the direction of tape movement, with an asphalt pavement test specimen detachably connected to its top, the test specimen contacting or not contacting the tape; an adhesive component disposed at the top of the evaluation box, including a pressing roller movably connected to the evaluation box, positioned above the tape, the pressing roller rolling into contact with the tape when the test specimen contacts it; and a camera disposed on one side of the bottom of the evaluation box, used to capture images of the tape after it has passed the support member and contacted the test specimen. This invention can effectively improve the detection accuracy of asphalt pavement aging evaluation.

Description

Technical Field

[0001] This invention belongs to the field of pavement testing technology, and in particular relates to a device and method for evaluating the aging depth of asphalt pavement. Background Technology

[0002] During the service life of asphalt pavements, the surface asphalt is affected by ultraviolet radiation and high temperatures, leading to aging and damage such as cracking and potholes. Currently, pavement recycling often involves recycling the entire surface layer (4cm) or the surface layer and intermediate layer (4+6cm), without fully considering the extent of aging. Aging often occurs within the surface 1-2cm, resulting in the recycling of parts of the intermediate or surface layer that do not require recycling due to a lack of assessment, thus wasting resources. By effectively evaluating and testing the aging depth, the extent of pavement aging can be determined, and recycling can be carried out only within the aging depth range. This can save maintenance costs and make maintenance construction more environmentally friendly. Summary of the Invention

[0003] The purpose of this invention is to provide an asphalt pavement aging depth evaluation device and method to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention provides the following solution: an asphalt pavement aging depth evaluation device, comprising:

[0005] An evaluation box, with a seam sealing tape installed at the top inside the evaluation box. One end of the seam sealing tape is connected to a driving component, and the seam sealing tape can be selectively moved or stopped relative to the evaluation box by the driving component.

[0006] An evaluation component is disposed at the bottom of the evaluation box. The evaluation component includes a support member that slides with the evaluation box. The support member is disposed in the moving direction of the joint sealing tape. An asphalt pavement test specimen is detachably connected to the top of the support member. The asphalt pavement test specimen selectively abuts against or does not contact the joint sealing tape.

[0007] An adhesive component is disposed at the top of the evaluation box. The adhesive component includes a pressing roller that is movably connected to the evaluation box and is located above the sealing strip. When the asphalt pavement test specimen abuts against the sealing strip, the pressing roller and the sealing strip roll into contact.

[0008] A camera is installed on one side of the bottom of the evaluation box. The camera is used to capture images of the joint tape after it passes through the support and comes into contact with the asphalt pavement test piece.

[0009] Preferably, one end of a support plate is fixedly connected to the inner wall of the bottom of the evaluation box, and a gap is provided between the other end of the support plate and the evaluation box. The camera and the support member are respectively arranged on both sides of the support plate. The support member includes a movable slide rail with one end fixedly connected to the support plate and the other end of the movable slide rail fixedly connected to the evaluation box. A lifting member is drivenly connected to the movable slide rail, and the asphalt pavement test piece is raised and lowered relative to the joint sealing tape through the lifting member.

[0010] Preferably, the lifting component includes a connecting seat slidably mounted on the movable slide rail. The top end of the connecting seat has a groove. A first motor is fixedly connected to the outer wall of the connecting seat. One end of a first screw is fixedly connected to the output shaft of the first motor. The other end of the first screw extends into the groove and is rotatably connected to the connecting seat. A slider is threaded onto the first screw. One end of a scissor lift is hinged to the slider. A fixing block is hinged to the other end of the scissor lift. One end of the fixing block extends into the groove and is fixedly connected to the connecting seat. A support seat is provided at the top end of the scissor lift. The asphalt pavement test piece is detachably connected to the support seat.

[0011] Preferably, the connecting seat is further provided with a control component that is connected to the movable slide rail in a transmission manner. The control component includes a second motor fixedly connected to the bottom end of the connecting seat. The output shaft of the second motor is fixedly connected to a drive gear through a coupling. The side wall of the movable slide rail and the drive gear are provided with tooth grooves, and the drive gear meshes with the tooth grooves.

[0012] Preferably, the driving component includes a first take-up roller and a second take-up roller arranged opposite to each other, and both the first take-up roller and the second take-up roller are connected to the evaluation box. A buffer and a guide rod are arranged sequentially between the first take-up roller and the second take-up roller. The buffer is elastically slidably connected to the evaluation box, and the guide rod is fixedly connected to the evaluation box. A guide roller is connected to the bottom end of the guide rod. The buffer and the guide roller respectively abut against the seam sealing tape.

[0013] Preferably, the buffer includes a sleeve with one end fixed to the evaluation box, a movable rod slidably connected inside the sleeve, two ends of a shock-absorbing spring being fixedly connected to the top end of the movable rod and the inner wall of the top end of the sleeve, and a buffer roller being connected to the bottom end of the movable rod extending out of the sleeve, the buffer roller abutting against the seam sealing tape.

[0014] Preferably, the pressing roller is disposed between the guide rod and the buffer member, and one end of the pressing roller is drivenly connected to an adjusting member. The adjusting member includes a mounting seat fixedly connected to the inner wall of the top of the evaluation box. A sliding groove is opened at the bottom end of the mounting seat, and an adjusting seat is slidably connected in the sliding groove. One end of a lifting cylinder is fixedly connected to the bottom end of the adjusting seat, and the other end of the lifting cylinder is drivenly connected to the pressing roller. The pressing roller is interchangeable with the lifting cylinder.

[0015] Preferably, a third motor is fixedly connected to the end of the lifting cylinder away from the adjusting seat, and the output shaft of the third motor is fixedly connected to a rotating disk through a coupling. At least three pressing rollers are provided, and a plurality of pressing rollers are circumferentially and equally spaced on the rotating disk. The pressing rollers are rotatably connected to the rotating disk.

[0016] A method for evaluating the aging depth of asphalt pavement, based on the aforementioned asphalt pavement aging depth evaluation device, further includes the following steps:

[0017] S1, Indoor test preparation of asphalt pavement specimens with the same structure as the actual pavement layer;

[0018] S2, combined with meteorological data, calculates the total amount of ultraviolet radiation since the road surface entered service, and combines it with the unit ultraviolet radiation dose on the surface of the specimen in the indoor aging test, which is equivalent to the ultraviolet radiation duration of the ultraviolet aging test.

[0019] S3, investigate the highest monthly temperature of the road surface, and design the equivalent aging test aging temperature;

[0020] S4. Based on the aging parameters obtained in steps S2 and S3, an aging test is conducted on the asphalt pavement specimen to obtain the asphalt pavement surface specimen.

[0021] S5. After the aging test is completed, the surface crack depth H1 of the asphalt pavement test specimen is measured.

[0022] S6. Place the asphalt pavement test specimen in the asphalt pavement aging depth evaluation device and fix it on the support. Move the support to below the joint sealing tape so that the asphalt pavement test specimen comes into contact with the joint sealing tape.

[0023] S7, when the asphalt pavement test piece comes into contact with one side of the joint sealing tape, control the pressing roller to press and contact the other side of the joint sealing tape;

[0024] S8, control the asphalt pavement test piece to no longer contact the joint sealing tape, and then move the joint sealing tape above the camera;

[0025] S9 uses a camera to capture and record the falling of aging debris from asphalt pavement test pieces, serving as a basis for evaluating the degree of aging of asphalt pavement.

[0026] S10. After completing one shooting process, repeat the above steps S1-S4 multiple times until there are no aging debris of asphalt pavement test specimens on the surface of the joint sealing tape. Take out the asphalt pavement test specimens and measure the cracks and pothole depths on their surfaces, and record the maximum depth H2.

[0027] S11, take the maximum values ​​of H1 and H2 as the maximum aging depth of the asphalt surface layer specimen.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects:

[0029] This invention utilizes a support member slidably connected to an evaluation box to first fix the asphalt pavement test specimen. Then, the movement of the sealing tape is stopped, and the top surface of the asphalt pavement test specimen adheres to the sealing tape through the action of the support member. At the same time, a pressing roller is used to press the adhered sealing tape to improve the adhesion of the sealing tape to aging debris. Then, the support member is used again to detach the asphalt pavement test specimen from the sealing tape, thereby removing the aging debris and adhering it to the sealing tape. The sealing tape is then moved by a drive member to move the area with aging debris above a camera, which captures and records the data. By repeatedly testing the aging degree of the asphalt pavement test specimen, detailed overall aging data is obtained, effectively improving the accuracy of asphalt pavement aging evaluation. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described 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.

[0031] Figure 1 This is a schematic diagram of the overall device.

[0032] Figure 2 for Figure 1 A magnified view of a section at point A;

[0033] Figure 3 This is a diagram showing the positional relationship between the mounting base and the adjusting base;

[0034] Figure 4 This is a diagram showing the positional relationship between the connecting seat and the movable slide rail;

[0035] Figure 5 A diagram showing the connection relationship between the asphalt pavement test specimen and the joint sealing tape;

[0036] The components include: 1. Evaluation box; 2. Sealing tape; 3. Camera; 4. Pressing roller; 5. Support plate; 6. Moving slide rail; 7. Connecting seat; 8. First motor; 9. First screw; 10. Slider; 11. Scissor lift; 12. Fixing block; 13. Limiting rod; 14. Support seat; 15. Clamping plate; 16. Clamping spring; 17. Second motor; 18. Drive gear; 19. Limiting groove; 20. First take-up roller; 21. Second take-up roller; 22. Guide rod; 23. Guide roller; 24. Sleeve; 25. Moving rod; 26. Shock-absorbing spring; 27. Buffer roller; 28. Mounting seat; 29. ​​Adjusting seat; 30. Lifting cylinder; 31. Fourth motor; 32. Second screw; 33. Third motor; 34. Rotating disk; 35. Rotating rod; 36. Lifting platform; 37. Asphalt pavement test piece. Detailed Implementation

[0037] 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.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example: Refer to Figures 1-5 An asphalt pavement aging depth evaluation device, comprising:

[0040] Evaluation box 1, with a seam sealing tape 2 installed at the top inside the evaluation box 1. One end of the seam sealing tape 2 is connected to a drive component, and the seam sealing tape 2 can be selectively moved or stopped relative to the evaluation box 1 by the drive component.

[0041] An evaluation component is set at the bottom of the evaluation box 1. The evaluation component includes a support member that slides with the evaluation box 1. The support member is set in the moving direction of the sealing tape 2. An asphalt pavement test piece 37 is detachably connected to the top of the support member. The asphalt pavement test piece 37 selectively abuts against or does not contact the sealing tape 2.

[0042] The bonding component is set at the top of the evaluation box 1. The bonding component includes a pressing roller 4 that is movably connected to the evaluation box 1. The pressing roller 4 is located above the sealing strip 2. When the asphalt pavement test piece 37 abuts against the sealing strip 2, the pressing roller 4 rolls and contacts the sealing strip 2.

[0043] Camera 3 is set on one side of the bottom of the evaluation box 1. Camera 3 is used to photograph the joint sealing tape 2 after it passes the support and comes into contact with the asphalt pavement test piece 37.

[0044] Reference Figures 1-5 This invention utilizes a support member slidably connected to the evaluation box 1 to first fix the asphalt pavement test specimen 37, then stops moving the sealing tape 2. Through the action of the support member, the top surface of the asphalt pavement test specimen 37 adheres to the sealing tape 2. At the same time, the pressing roller 4 presses the adhered sealing tape 2 to increase the adhesion force of the sealing tape 2 to the aging debris. Then, through the action of the support member, the asphalt pavement test specimen 37 is detached from the sealing tape 2, thereby removing the aging debris and adhering it to the sealing tape 2. The sealing tape 2 is then moved by the drive member to move the area with the aging debris above the camera 3, where the camera 3 captures and records the data. By repeatedly testing the aging degree of the asphalt pavement test specimen 37, detailed overall aging data is obtained, effectively improving the accuracy of the asphalt pavement aging evaluation.

[0045] Furthermore, due to the aging and cracking of traditional asphalt pavements, when new debris is formed from the cracks, the new debris will continue to cause aging and cracking. Therefore, common cracked debris often exists in a multi-layered structure. This patent can achieve repeated adhesion of aging debris through a cyclically moving joint sealing tape 2. Not only is the recording and comparison done by the camera 3, but the amount of debris adhering to the joint sealing tape 2 is used to determine the number of layers of new debris generated by the aging debris itself, thereby obtaining a detailed evaluation result of the aging condition of the asphalt pavement test specimen 37. At the same time, through the repeated adhesion of the joint sealing tape 2, the cracked potholes of the entire asphalt pavement test specimen 37 are cleaned. When there is no aging debris on the joint sealing tape 2, the cleaned asphalt pavement test specimen 37 is removed from the support, and the depth of the aging cracked potholes is measured by ultrasonic waves, lasers, etc., thereby obtaining an accurate and effective aging and cracking condition of the asphalt pavement. The measured aging condition is compared with the amount of debris falling observed by the camera 3, which greatly improves the accuracy of the aging evaluation of the asphalt pavement.

[0046] In this technical solution, the asphalt pavement test specimen 37 is selected from asphalt sample blocks with the same usage conditions, environment, and aging as the pavement to be evaluated, so as to improve the accuracy of aging evaluation of asphalt pavement by using asphalt samples that closely match actual road conditions.

[0047] In one embodiment of the present invention, an asphalt pavement test specimen 37 is treated with the highest summer temperature and ultraviolet light on the pavement to be evaluated within a unit time. The crack depth on the surface of the asphalt pavement test specimen 37 is measured at this time. Then, the treated asphalt pavement test specimen 37 is placed in the evaluation device and adhered by the joint sealing tape 2. After observing no debris peeling off on the camera 3, the asphalt pavement test specimen 37 is taken out and its crack depth is measured. By comparing the change in crack depth before and after, the degree of asphalt aging on the pavement to be evaluated within a unit time is obtained, thereby improving the applicability of the detection and evaluation data.

[0048] In another embodiment of the present invention, the camera 3 is fixedly attached to the top of the lifting platform 36. The lifting platform 36 is a common PT-GD404 electric lifting platform 36, which provides the camera 3 with three-axis movement within the evaluation box 1, thereby enhancing the shooting angle of the camera 3.

[0049] Furthermore, one end of a support plate 5 is fixedly connected to the inner wall of the bottom of the evaluation box 1, and a gap is provided between the other end of the support plate 5 and the evaluation box 1. The camera 3 and the support are respectively set on both sides of the support plate 5. The support includes a movable slide rail 6 with one end fixedly connected to the support plate 5, and the other end of the movable slide rail 6 is fixedly connected to the evaluation box 1. A lifting component is connected to the movable slide rail 6, and the asphalt pavement test piece 37 is raised and lowered relative to the joint sealing tape 2 through the lifting component.

[0050] Furthermore, the lifting component includes a connecting seat 7 that slides on the movable slide rail 6. The top of the connecting seat 7 has a groove. A first motor 8 is fixedly connected to the outer wall of the connecting seat 7. One end of a first screw 9 is fixedly connected to the output shaft of the first motor 8. The other end of the first screw 9 extends into the groove and is connected to the connecting seat 7. A slider 10 is threadedly connected to the first screw 9. One end of a scissor lift 11 is hinged to the slider 10. A fixing block 12 is hinged to the other end of the scissor lift 11. One end of the fixing block 12 extends into the groove and is fixedly connected to the connecting seat 7. A support seat 14 is provided at the top of the scissor lift 11. The asphalt pavement test piece 37 is detachably connected to the support seat 14.

[0051] Furthermore, the connecting seat 7 is also provided with a control component that is connected to the moving slide rail 6 in a transmission manner. The control component includes a second motor 17 fixedly connected to the bottom end of the connecting seat 7. The output shaft of the second motor 17 is fixedly connected to a drive gear 18 through a coupling. The side wall of the moving slide rail 6 and the drive gear 18 are provided with tooth grooves, and the drive gear 18 meshes with the tooth grooves.

[0052] Reference Figures 1-2A movable slide rail 6 is provided corresponding to the sealing tape 2. The second motor 17 is started, driving the drive gear 18 to rotate. The drive gear 18 meshes with the teeth on the movable slide rail 6, causing the connecting seat 7 to move. Simultaneously, the first motor 8 is started, driving the first screw 9 to rotate. The first screw 9 moves the slider 10 to press against the scissor lift 11. A limit rod 13 is hinged to one side of the top of the scissor lift 11, sliding against the support seat 14. The other side of the top of the scissor lift 11 is also hinged to the support seat 14. This allows the scissor lift 11 to raise the support seat 14, causing the asphalt pavement test piece 37 to come into contact with the sealing tape 2. The pressing roller 4 then... The aged debris is adhered to the joint sealing tape 2. In this technical solution, two clamping plates 15 are slidably connected to each other at the top of the support base 14. A clamping spring 16 is fixed between the clamping plates 15 and the support base 14, so that the two clamping plates 15 clamp and fix the asphalt pavement test piece 37, realizing disassembly and connection. Alternatively, a bidirectional screw (not shown in the figure) can be passed through the bottom of the two clamping plates 15. One end of the bidirectional screw is fixed to the output shaft of the servo motor. The servo motor causes the clamping plates 15 to move towards each other to fix the asphalt pavement test piece 37, avoiding the inconvenience of peeling the joint sealing tape 2 due to excessive adhesion between the joint sealing tape 2 and the asphalt surface.

[0053] Furthermore, the driving component includes a first take-up roller 20 and a second take-up roller 21 arranged opposite to each other, and both the first take-up roller 20 and the second take-up roller 21 are connected to the evaluation box 1. A buffer and a guide rod 22 are arranged sequentially between the first take-up roller 20 and the second take-up roller 21. The buffer is elastically slidably connected to the evaluation box 1, and the guide rod 22 is fixedly connected to the evaluation box 1. A guide roller 23 is connected to the bottom end of the guide rod 22. The buffer and the guide roller 23 respectively abut against the seam sealing tape 2.

[0054] In this technical solution, the first take-up roller 20 and the second take-up roller 21 are both fixedly connected to the evaluation box 1 via connecting rods, and a rotating motor (not shown in the figure) is fixedly connected to the connecting rods. The rotating motors drive the first take-up roller 20 and the second take-up roller 21 to take up and down in coordination, thereby driving the sealing tape 2 to be stably conveyed and stopped in the evaluation box 1. During the conveying process of the sealing tape 2, it passes through the buffer and the guide rod 22 in sequence. The guide roller 23 is flush with the bottom end of the second take-up roller 21, ensuring that the sealing tape 2 provides a shooting plane for the camera 3. The buffer can effectively alleviate the strong force on the sealing tape 2 when the asphalt pavement test piece 37 is lifted, effectively preventing the sealing tape 2 from breaking under the action of external force.

[0055] Furthermore, the buffer includes a sleeve 24 with one end fixed to the evaluation box 1. A movable rod 25 is slidably connected inside the sleeve 24. The top end of the movable rod 25 and the inner wall of the top end of the sleeve 24 are respectively fixed to the two ends of the shock-absorbing spring 26. The bottom end of the movable rod 25 extends out of the sleeve 24 and is connected to a buffer roller 27. The buffer roller 27 abuts against the seam sealing tape 2.

[0056] Furthermore, the pressing roller 4 is positioned between the guide rod 22 and the buffer component. One end of the pressing roller 4 is connected to an adjusting component, which includes a mounting base 28 fixedly connected to the inner wall of the top of the evaluation box 1. The bottom end of the mounting base 28 has a sliding groove, in which an adjusting seat 29 is slidably connected. One end of a lifting cylinder 30 is fixedly connected to the bottom end of the adjusting seat 29, and the other end of the lifting cylinder 30 is connected to the pressing roller 4. The pressing roller 4 is interchangeable with the lifting cylinder 30.

[0057] Furthermore, a third motor 33 is fixedly connected to the end of the lifting cylinder 30 away from the adjusting seat 29. The output shaft of the third motor 33 is fixedly connected to the rotating disk 34 through a coupling. At least three pressing rollers 4 are provided, and several pressing rollers 4 are arranged circumferentially at equal intervals on the rotating disk 34. The pressing rollers 4 are connected to the rotating disk 34.

[0058] Reference Figure 1 , Figure 3 In this technical solution, a sliding telescopic slide rod (not marked in the figure) is provided on the opposite side of the lifting cylinder 30. The pressing roller 4 is mounted between the telescopic slide rod and the lifting cylinder 30, and the two are fixed together by a connecting rod to ensure stability during the lifting process. The third motor 33 is fixed to the movable end of the lifting cylinder 30, and the output shaft of the third motor 33 is fixed to one end of the rotating rod 35 through a coupling. The rotating rod 35 passes through the rotating disk 34 and is fixed to the rotating disk 34. The other end of the rotating rod 35 is rotatably connected to the movable end of the telescopic rod. By starting the third motor 33, the rotating disk 34 drives several pressing rollers 4 to rotate, so that the asphalt pavement test piece 37 that abuts against the sealing tape 2 is fully adhered.

[0059] A method for evaluating the aging depth of asphalt pavement, based on the aforementioned asphalt pavement aging depth evaluation device, further includes the following steps:

[0060] S1, Indoor test preparation of asphalt pavement specimens with the same structure as the actual pavement layer;

[0061] S2, combined with meteorological data, calculates the total amount of ultraviolet radiation since the road surface entered service, and combines it with the unit ultraviolet radiation dose on the surface of the specimen in the indoor aging test, which is equivalent to the ultraviolet radiation duration of the ultraviolet aging test.

[0062] S3, investigate the highest monthly temperature of the road surface, and design the equivalent aging test aging temperature;

[0063] S4. Based on the aging parameters obtained in steps S2 and S3, an aging test is conducted on the asphalt pavement specimen to obtain asphalt pavement specimen 37.

[0064] S5. After the aging test is completed, the surface crack depth H1 of the asphalt pavement test specimen 37 is measured.

[0065] S6, fix the asphalt pavement test piece 37 on the support, move the support to below the joint sealing tape 2, so that the asphalt pavement test piece 37 abuts against the joint sealing tape 2;

[0066] S7, when the asphalt pavement test piece 37 comes into contact with one side of the joint sealing tape 2, control the pressing roller 4 to press the other side of the joint sealing tape 2;

[0067] S8, control the asphalt pavement test piece 37 to no longer contact the joint sealing tape 2, and then move the joint sealing tape 2 above the camera 3;

[0068] S9, using camera 3 to photograph and record the falling of aging debris from asphalt pavement test specimen 37, as a basis for evaluating the degree of aging of asphalt pavement;

[0069] S10. After completing one shooting process, repeat the above steps S1-S4 multiple times until there are no aged debris of asphalt pavement test piece 37 on the surface of the joint sealing tape 2. Take out the asphalt pavement test piece 37 and measure the cracks and potholes on its surface, and record the maximum depth.

[0070] S11, take the maximum values ​​of H1 and H2 as the maximum aging depth of the asphalt surface layer specimen.

[0071] By comparing the initial depth value and the maximum depth value, the aging and cracking of the asphalt pavement specimen 37 can be accurately determined. Combined with the information on the falling of several aging debris captured by camera 3, the detection accuracy can be improved.

[0072] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0073] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for evaluating the aging depth of asphalt pavement, characterized in that, include: Evaluation box (1), the top of the evaluation box (1) is provided with a seam sealing tape (2), one end of the seam sealing tape (2) is connected to a driving component, and the seam sealing tape (2) can be selectively moved or stopped relative to the evaluation box (1) by the driving component; An evaluation component is provided at the bottom of the evaluation box (1). The evaluation component includes a support member that slides with the evaluation box (1). The support member is provided in the moving direction of the joint sealing tape (2). An asphalt pavement test piece (37) is detachably connected to the top of the support member. The asphalt pavement test piece (37) selectively abuts against or does not contact the joint sealing tape (2). An adhesive component is provided at the top of the evaluation box (1). The adhesive component includes a pressing roller (4) that is movably connected to the evaluation box (1). The pressing roller (4) is located above the sealing strip (2). When the asphalt pavement test piece (37) abuts against the sealing strip (2), the pressing roller (4) rolls in contact with the sealing strip (2). A camera (3) is set on one side of the bottom of the evaluation box (1). The camera (3) is used to photograph the joint tape (2) after it passes through the support and comes into contact with the asphalt pavement test piece (37). One end of a support plate (5) is fixed to the inner wall of the bottom of the evaluation box (1). A gap is provided between the other end of the support plate (5) and the evaluation box (1). The camera (3) and the support member are respectively arranged on both sides of the support plate (5). The support member includes a movable slide rail (6) with one end fixed to the support plate (5). The other end of the movable slide rail (6) is fixed to the evaluation box (1). A lifting member is connected to the movable slide rail (6). The asphalt pavement test piece (37) is raised and lowered relative to the joint sealing strip (2) through the lifting member. The driving component includes a first take-up roller (20) and a second take-up roller (21) arranged opposite to each other, and both the first take-up roller (20) and the second take-up roller (21) are connected to the evaluation box (1). A buffer and a guide rod (22) are arranged sequentially between the first take-up roller (20) and the second take-up roller (21). The buffer is elastically slidably connected to the evaluation box (1), and the guide rod (22) is fixedly connected to the evaluation box (1). A guide roller (23) is connected to the bottom end of the guide rod (22). The buffer and the guide roller (23) respectively abut against the seam tape (2). The pressing roller (4) is disposed between the guide rod (22) and the buffer. One end of the pressing roller (4) is connected to an adjusting component. The adjusting component includes a mounting base (28) fixedly connected to the inner wall of the top of the evaluation box (1). The bottom end of the mounting base (28) is provided with a sliding groove. An adjusting seat (29) is slidably connected in the sliding groove. One end of a lifting cylinder (30) is fixedly connected to the bottom end of the adjusting seat (29). The other end of the lifting cylinder (30) is connected to the pressing roller (4). The pressing roller (4) is rotatably connected to the lifting cylinder (30).

2. The asphalt pavement aging depth evaluation device according to claim 1, characterized in that: The lifting component includes a connecting seat (7) slidably connected to the movable slide rail (6). The top end of the connecting seat (7) is provided with a groove. A first motor (8) is fixedly connected to the outer wall of the connecting seat (7). One end of a first screw (9) is fixedly connected to the output shaft of the first motor (8). The other end of the first screw (9) extends into the groove and is rotated with the connecting seat (7). A slider (10) is threadedly connected to the first screw (9). One end of a scissor lift (11) is hinged to the slider (10). A fixing block (12) is hinged to the other end of the scissor lift (11). One end of the fixing block (12) extends into the groove and is fixedly connected with the connecting seat (7). A support seat (14) is provided at the top end of the scissor lift (11). The asphalt pavement test piece (37) is detachably connected to the support seat (14).

3. The asphalt pavement aging depth evaluation device according to claim 2, characterized in that: The connecting seat (7) is also provided with a control component that is connected to the movable slide rail (6) in a transmission manner. The control component includes a second motor (17) fixedly connected to the bottom end of the connecting seat (7). The output shaft of the second motor (17) is fixedly connected to a drive gear (18) through a coupling. The side wall of the movable slide rail (6) and the drive gear (18) are provided with tooth grooves, and the drive gear (18) meshes with the tooth grooves.

4. The asphalt pavement aging depth evaluation device according to claim 1, characterized in that: The buffer component includes a sleeve (24) with one end fixed to the evaluation box (1). A movable rod (25) is slidably connected inside the sleeve (24). The top end of the movable rod (25) and the inner wall of the top end of the sleeve (24) are respectively fixed to the two ends of a shock-absorbing spring (26). The bottom end of the movable rod (25) extends out of the sleeve (24) and is connected to a buffer roller (27). The buffer roller (27) abuts against the seam tape (2).

5. The asphalt pavement aging depth evaluation device according to claim 1, characterized in that: The lifting cylinder (30) is fixedly connected to a third motor (33) at one end away from the adjusting seat (29). The output shaft of the third motor (33) is fixedly connected to a rotating disk (34) via a coupling. At least three pressing rollers (4) are provided. Several pressing rollers (4) are circumferentially and equally spaced on the rotating disk (34). The pressing rollers (4) are rotatably connected to the rotating disk (34).

6. A method for evaluating the aging depth of asphalt pavement, based on the asphalt pavement aging depth evaluation device according to claim 1, characterized in that, It also includes the following steps: S1, Indoor test preparation of asphalt pavement specimens with the same structure as the actual pavement layer; S2, combined with meteorological data, calculates the total amount of ultraviolet radiation since the road surface entered service, and combines it with the unit ultraviolet radiation dose on the surface of the specimen in the indoor aging test, which is equivalent to the ultraviolet radiation duration of the ultraviolet aging test. S3, investigate the highest monthly temperature of the road surface, and design the equivalent aging temperature for the aging test. S4. Based on the aging parameters obtained in steps S2 and S3, an aging test is conducted on the asphalt pavement specimen to obtain the asphalt pavement specimen (37). S5. After the aging test is completed, the surface crack depth H1 of the asphalt pavement test piece (37) is measured. S6, place the asphalt pavement test specimen (37) in the asphalt pavement aging depth evaluation device and fix it on the support. Move the support to below the joint sealing tape (2) so that the asphalt pavement test specimen (37) abuts against the joint sealing tape (2). S7, when the asphalt pavement test piece (37) comes into contact with one side of the joint sealing tape (2), control the pressing roller (4) to press the other side of the joint sealing tape (2); S8, control the asphalt pavement test piece (37) to no longer contact the joint sealing tape (2), and then move the joint sealing tape (2) above the camera (3); S9, use camera (3) to photograph and record the falling of aging debris from asphalt pavement test specimen (37) as a basis for evaluating the aging degree of asphalt pavement; S10. After completing one shooting process, repeat the above steps S1-S4 multiple times until there are no aging debris of asphalt pavement test piece (37) on the surface of the joint sealing tape (2). Take out the asphalt pavement test piece (37) and measure the cracks and potholes on its surface, and record the maximum depth H2. S11, take the maximum values ​​of H1 and H2 as the maximum aging depth of the asphalt pavement test specimen (37).

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