Device and method for testing high-temperature stability of ceramic fiber modified asphalt mixture

Abstract

The invention discloses a ceramic fiber modified asphalt mixture high-temperature stability testing device and method, and relates to the technical field of asphalt test.The ceramic fiber modified asphalt mixture high-temperature stability testing device comprises a testing machine box, the four corners of the bottom of the testing machine box are each in threaded connection with a base, two door plates are rotationally connected to the testing machine box, and an oil cylinder is fixedly connected to the top of an inner cavity of the testing machine box; a movable module is fixedly connected to a bottom telescopic shaft of the oil cylinder, a movable frame is slidably connected to the bottom of the movable module, and an adjusting assembly is arranged at the bottom of the movable frame. By adjusting the position of the loading wheel, different positions of an asphalt mixture in the asphalt mold can be rolled, the rolling effect of a vehicle in different areas of a road surface can be simulated, the test is closer to an actual road use scene, the load action point can be changed by adjusting the position of the loading wheel, and the test efficiency is improved. Local excessive deformation of the asphalt mixture caused by repeated rolling at a single position is reduced, so that the anti-rutting capacity distribution characteristic of the asphalt mixture is more comprehensively reflected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt testing, in particular to a device and method for testing high-temperature stability of ceramic fiber modified asphalt mixture. BACKGROUND

[0002] The asphalt pavement in cold regions will experience periodic freeze-thaw cycles, and this geographical environment poses a great challenge to the construction and maintenance of asphalt pavement. To overcome the influence of harsh natural conditions in cold regions on the performance of asphalt pavement, ceramic fibers are applied to asphalt mixture. Therefore, the asphalt mixture is a material made by mixing asphalt, aggregate (gravel, sand), ceramic fiber and mineral powder in proportion. Before application, the ceramic fiber modified asphalt mixture needs to be tested for high-temperature rutting, low-temperature splitting, immersion Marshall, freeze-thaw splitting and beam four-point bending fatigue. The high-temperature rutting test mainly involves repeatedly rolling the asphalt mixture with a reciprocating loading wheel to observe the deformation state of the asphalt sample after rolling.

[0003] However, the existing high-temperature rutting tester can only repeatedly roll the asphalt mixture at a single position during the test, which cannot simulate the lateral distribution of vehicle load on the actual pavement. Repeatedly rolling at a single position can cause local excessive deformation of the asphalt sample, thus failing to reflect the anti-rutting capacity distribution characteristics of the asphalt mixture under real conditions. In addition, before the experiment, the asphalt mixture is manually laid on the test sample mold after mixing. In most cases, the asphalt mixture is not fully cooled, so part of the asphalt on the asphalt mixture has not completely solidified. As a result, when the loading wheel rolls, some asphalt or aggregate particles will adhere to the loading wheel. Over time, a thickened cushion or local protrusion will form on the loading wheel, causing stress concentration and increasing the pressure exerted by the loading wheel on the asphalt sample, which will affect the accuracy of the asphalt mixture test. SUMMARY

[0004] To solve the above technical problems, the present application provides a device and method for testing the high-temperature stability of ceramic fiber modified asphalt mixture.

[0005] The technical solution is as follows: The device for testing the high-temperature stability of ceramic fiber modified asphalt mixture comprises a testing machine box, a base fixedly connected to the bottom of the testing machine box, two door plates rotatably connected to the testing machine box, an oil cylinder fixedly connected to the top of the inner cavity of the testing machine box, a moving module fixedly connected to the telescopic shaft of the oil cylinder, a movable frame slidably connected to the bottom of the moving module, a mounting seat fixedly connected to the inside of the testing machine box, an asphalt mold fixedly connected to the top of the mounting seat, and an adjusting assembly provided at the bottom of the movable frame. The adjusting assembly comprises an adjusting frame fixedly connected to the bottom of the movable frame, an adjusting slot is formed in the bottom of the adjusting frame, an adjusting rod is slidably connected inside the adjusting slot, a loading wheel is detachably connected to the bottom of the adjusting rod, a threaded rod is rotatably connected inside the adjusting slot, the threaded rod extends out of the adjusting slot and is rotatably connected to a rotating rod outside the adjusting frame, a handle is rotatably connected to the end of the rotating rod away from the threaded rod, a locking ring is fixedly connected to the end of the adjusting frame close to the rotating rod, a plurality of notches are uniformly formed in the outer edge of the locking ring, the handle can be embedded in the notches of the locking ring, and the handle is tightly fitted with the notches after being embedded.

[0006] Further, the moving module comprises a frame plate, a guide rod and a reciprocating mechanism, the frame plate is fixedly connected to the telescopic shaft of the oil cylinder, the guide rod is fixedly connected to the frame plate, the reciprocating mechanism drives the movable frame to move horizontally on the guide rod, the inside of the test case is provided with a radiation lamp and a temperature sensor, and the wheel is composed of a wheel frame and a roller.

[0007] Further, the adjusting slot is T-shaped, the adjusting rod is H-shaped, a threaded hole is formed in one end of the adjusting rod inside the adjusting slot, the threaded rod is threadedly connected with the threaded hole of the adjusting rod, and the inner wall of the notch of the locking ring is provided with rubber.

[0008] Further, the loading wheel is provided with a quick release assembly, the quick release assembly comprises a mounting slot and two movable slots formed in the wheel frame of the loading wheel, the two movable slots are respectively located on the two sides of the mounting slot and are in communication with the inside of the mounting slot, one spring is fixedly connected to the inside of each movable slot, one clamping block is fixedly connected to the end of each spring away from the movable slot, and the clamping blocks are slidably connected in the two movable slots.

[0009] Further, the mounting slot is T-shaped, the ends of the two clamping blocks inside the mounting slot are provided with inclined surfaces, a lever is fixedly connected to each clamping block, and the levers of the two clamping blocks extend to the outside of the movable slots.

[0010] Further, the adjusting frame is provided with a cleaning assembly, the cleaning assembly comprises a fixed frame fixedly connected to the adjusting frame, two sliding grooves are formed in the bottom of the fixed frame, a collecting box is slidably connected between the two sliding grooves, a handle is fixedly connected to the side of the collecting box away from the adjusting frame, a scraper is rotatably connected to the side of the collecting box close to the adjusting frame, the top of the scraper abuts against the roller of the loading wheel, a torsion spring is arranged at the rotatable connection between the scraper and the collecting box, and a collecting interface is fixedly connected to the test case.

[0011] Further, the collecting box is composed of a box body and a sliding strip, the sliding strip is slidably connected in the sliding groove, the sliding strip of the collecting box is made of rubber, a through hole corresponding to the position of the collecting interface is formed in the test case, the collecting interface is in communication with the inside of the test case through the through hole, and a sealing plate is rotatably connected to the side opening of the collecting interface.

[0012] Further, the ceramic fiber modified asphalt mixture high temperature stability test device is applied, and the test method comprises the following steps: Step one: clean the mounting seat in the test box, ensure that there is no residual asphalt or sundries, confirm that the loading wheel is in the locked state, confirm that the scraper is tightly attached to the rolling surface of the loading wheel, and check whether the collection box is installed in place; Step two: pour the prepared ceramic fiber modified asphalt mixture into the asphalt mold, flatten it to the standard thickness, check the sealing performance of the edge of the asphalt mold to avoid overflow of the mixture during the test, open the door plate of the test box, loosen the fixing bolts of the mounting seat and the asphalt mold, take out the old asphalt mold, put the new asphalt mold containing the mixture into the mounting seat and fix it, ensure that the mold is stable and does not shake, close the door plate, check the sealing performance of the test box to prevent temperature loss during heating; Step three: start the device, the telescopic shaft of the oil cylinder drives the moving module and the movable frame to move downward, so that the loading wheel contacts the surface of the mixture and applies pressure to the mixture, and the radiant lamp heats the mixture, after the temperature is stable to the target value, start the reciprocating mechanism of the moving module to drive the movable frame and the loading wheel to reciprocally roll in the horizontal direction; Step four: the loading wheel reciprocally rolls at the initial position for a set number of times, and the rut depth and deformation rate are recorded in real time; Step five: when the set number of times is completed, rotate the handle to unlock the threaded rod, then rotate the rotating rod, the rotating rod drives the threaded rod to rotate, drives the adjusting rod to slide in the adjusting groove to adjust the position of the loading wheel, then reset and lock the rotating rod; Step six: repeat steps three and four to repeat the rolling test at a new position to simulate different regional stress conditions and record the rut data at multiple positions; Step seven: if it is necessary to simulate the influence of different tire widths on the rut, push the push plates on the loading wheel to the two sides, so that the clamping blocks are withdrawn from the movable groove, then slide the loading wheel along the mounting groove, remove the loading wheel, align the mounting groove of the new loading wheel with the bottom of the adjusting rod and insert it, the clamping blocks are automatically locked under the action of the spring, repeat steps three and four to complete the rolling test under different tire widths and study the influence of tire width on the rut; Step eight: during the rolling process, when the loading wheel rotates counterclockwise, the scraper automatically scrapes the asphalt adhered to the rolling surface, and the scraped material falls into the collection box; Step nine: after the test is completed, stop the loading wheel at the collection interface side, open the sealing plate, pull out the collection box, clean the asphalt residues in the collection box, then reset the collection box, close the door plate, and clean the entire device.

[0013] As described above, the ceramic fiber modified asphalt mixture high temperature stability test device and method have the following beneficial effects: By adjusting the position of the loading wheel, the asphalt mixture in different positions in the asphalt mold can be rolled, the rolling effect of the vehicle in different areas of the road can be simulated, the test is closer to the actual road use scene, the position of the loading wheel is adjusted, the load acting point can be changed, the local excessive deformation of the asphalt mixture caused by repeated rolling at a single position is reduced, and the anti-rutting ability distribution characteristics of the asphalt mixture are more comprehensively reflected; By replacing the loading wheel with different tire widths, the influence of tire width on rutting can be studied, and by designing a quick release assembly, the loading wheel can be quickly replaced during testing, and the disassembly and assembly are more convenient. The asphalt adhered to the rolling surface of the loading wheel is removed by the scraper, which prevents the rolling wheel of the loading wheel from forming a thickened cushion or local protrusion due to the adhesion of too much asphalt, avoids affecting the test effect, and further avoids wearing the rubber tire surface of the loading wheel, thereby prolonging the service life of the loading wheel. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic view of the overall components of the present application; Figure 2 It is a three-dimensional schematic view of the oil cylinder, moving module, loading wheel and other components of the present application; Figure 3 It is a three-dimensional schematic view of the structure inside the test box of the present application; Figure 4 It is a three-dimensional schematic view of the adjusting frame, adjusting groove, adjusting rod, threaded rod and other components of the present application; Figure 5 It is a sectional three-dimensional schematic view of the overall components of the present application; Figure 6 It is a three-dimensional schematic view of the adjusting groove, adjusting rod, torsion spring and other components of the present application; Figure 7 It is a three-dimensional schematic view of the present application Figure 6 It is an enlarged schematic view of the component at A in the present application; Figure 8 It is a three-dimensional schematic view of the mounting groove, clamping block and other components of the present application; Figure 9 It is a three-dimensional schematic view of the fixing frame, sliding groove, collection box and other components of the present application.

[0015] In the present application, the reference signs are: 1, test box; 2, base; 3, door plate; 4, oil cylinder; 5, moving module; 6, movable frame; 8, loading wheel; 11, mounting seat; 12, asphalt mold; Adjusting assembly: 71, adjusting frame; 72, adjusting groove; 73, adjusting rod; 74, threaded rod; 75, rotating rod; 76, handle; 77, locking ring; Quick release assembly: 91, mounting groove; 92, movable slot; 93, spring; 94, clamping block; 95, push plate; Cleaning assembly: 101, fixing frame; 102, sliding groove; 103, collection box; 104, handle; 105, torsional spring; 106, scraper; 107, collection interface; 108, sealing plate. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] The embodiments provided by the present application will be described in detail below: As Figures 1 to 9 As shown in the ceramic fiber modified asphalt mixture high temperature stability test device, a test machine box 1, the bottom four corners of the test machine box 1 are all screw connected with a base 2, two door plates 3 are rotatably connected on the test machine box 1, an oil cylinder 4 is fixedly connected at the top of the inner cavity of the test machine box 1, a moving module 5 is fixedly connected on the bottom telescopic shaft of the oil cylinder 4, a movable frame 6 is slidably connected at the bottom of the moving module 5, an installation seat 11 is fixedly connected inside the test machine box 1, the installation seat 11 is located below the movable frame 6, an asphalt mold 12 is fixedly connected on the top of the installation seat 11 through bolts, the asphalt mold 12 can be replaced by disassembling the bolts, and an adjusting assembly for adjusting the rut test position is arranged at the bottom of the movable frame 6.

[0018] It should be noted that the moving module 5 is composed of a frame plate, a guide rod and a reciprocating mechanism, the frame plate is fixedly connected on the telescopic shaft of the oil cylinder 4, the guide rod is fixedly connected on the frame plate, the reciprocating mechanism can drive the movable frame 6 to move horizontally and reciprocally on the guide rod of the moving module 5, the reciprocating mechanism can adopt a motor + screw structure, the movable frame 6 is threadedly connected with the screw, and the motor drives the screw to rotate to drive the movable frame 6 to move horizontally. The inside of the test machine box 1 is provided with a radiation lamp and a temperature sensor, the radiation lamp is used to provide a high-temperature environment, and the temperature sensor is used to monitor and feed back temperature data.

[0019] The adjusting assembly comprises an adjusting frame 71 fixedly connected to the bottom of the movable frame 6 by bolts, the bottom of the adjusting frame 71 is provided with an adjusting groove 72, the inside of the adjusting groove 72 is slidably connected with an adjusting rod 73, the bottom of the adjusting rod 73 is fixedly connected with the loading wheel 8, the loading wheel 8 is composed of a wheel frame and a roller, the inside of the adjusting groove 72 is rotatably connected with a threaded rod 74, the threaded rod 74 extends to the outside of the adjusting frame 71 through the adjusting groove 72, the end of the threaded rod 74 penetrating out of the adjusting groove 72 is rotatably connected with a rotating rod 75, the end of the rotating rod 75 away from the threaded rod 74 is rotatably connected with a handle 76, and the end of the adjusting frame 71 close to the rotating rod 75 is fixedly connected with a locking ring 77 by bolts.

[0020] It should be noted that the adjusting groove 72 is provided in T shape, the adjusting rod 73 is provided in H shape, the end of the adjusting rod 73 located inside the adjusting groove 72 is provided with a threaded hole, the threaded rod 74 is threadedly connected with the threaded hole of the adjusting rod 73, the outer edge of the locking ring 77 is provided with a plurality of slot openings arranged in annular array, the inner side wall of the slot opening of the locking ring 77 is provided with rubber, the handle 76 can be embedded inside the slot opening of the locking ring 77, and the handle 76 is tightly matched with the slot opening after being embedded inside the slot opening of the locking ring 77.

[0021] Specifically, the operator opens the door plate 3, loosens the bolts at the connecting position between the asphalt mold 12 and the mounting seat 11, and then takes out the asphalt mold 12 from the inside of the test machine box 1, places the prepared ceramic fiber modified asphalt mixture in the inside of the asphalt mold 12, flattens the asphalt mixture placed in the asphalt mold 12, places the asphalt mold 12 containing the asphalt mixture on the mounting seat 11, then tightens the bolts to fix the asphalt mold 12 on the mounting seat 11, and finally closes the door plate 3. Then the device is started, the oil cylinder 4 is started, the telescopic shaft thereof is extended downward, the movable module 5 and the movable frame 6 are driven to move downward as a whole, the movable frame 6 drives the adjusting frame 71 to move downward, the adjusting frame 71 drives the adjusting rod 73 and the loading wheel 8 to move downward, when the roller of the loading wheel 8 contacts the surface of the asphalt mixture in the asphalt mold 12, the roller of the loading wheel 8 will press the asphalt mixture, at the same time, the reciprocating mechanism on the movable module 5 is started, so that the movable frame 6 reciprocally slides horizontally on the guide rod of the movable module 5, the movable frame 6 drives the adjusting frame 71 to move synchronously, at this time, the adjusting frame 71 drives the adjusting rod 73 and the loading wheel 8 to move synchronously, so that the roller of the loading wheel 8 reciprocally rolls on the asphalt mixture in the asphalt mold 12, and the roller of the loading wheel 8 reciprocally rolls on the asphalt mixture in the asphalt mold 12 to realize the simulation of the rolling of the asphalt mixture by the vehicle driving on the real road. At the same time, the radiation lamp is started to provide a high-temperature environment for the asphalt mixture on the asphalt mold 12, so that the high-temperature rut test of the asphalt mixture in the asphalt mold 12 is realized.

[0022] The existing rut tester is fixed in position during the reciprocating rolling process of the loading wheel 8, that is, the loading wheel 8 can only roll at a single position and cannot simulate the situation that the asphalt mixture at different positions is subjected to vehicle rolling after being laid on a conventional pavement. Therefore, the position of the loading wheel 8 can be adjusted to roll the asphalt mixture at different positions in the asphalt mold 12. If the asphalt mixture at different positions in the asphalt mold 12 needs to be rolled, the worker can rotate the rotating rod 75 so that the handle 76 is no longer tightly matched with the notch of the locking ring 77. When the rotating rod 75 is rotated by 180 degrees on the threaded rod 74, the handle 76 is located on the side of the rotating rod 75 away from the locking ring 77. Then the worker holds the handle 76 and rotates the rotating rod 75 to drive the threaded rod 74 to rotate. The rotating rod 75 and the handle 76 also rotate during the rotation of the rotating rod 75, so that the handle 76 does not rotate in the hand when the worker holds it, avoiding the discomfort caused by friction with the hand. The threaded rod 74 rotates to drive the adjusting rod 73 to slide horizontally in the adjusting groove 72. The sliding of the adjusting rod 73 drives the loading wheel 8 at the bottom to move synchronously, thereby adjusting the position of the loading wheel 8 horizontally, and rolling the asphalt mixture at different positions in the asphalt mold 12, thereby simulating the rolling effect of the vehicle at different areas of the pavement, making the test closer to the actual road use scene. Adjusting the position of the loading wheel 8 can change the load application point, reduce the local excessive deformation of the asphalt mixture caused by repeated rolling at a single position, and more comprehensively reflect the anti-rutting ability distribution characteristics of the asphalt mixture.

[0023] It should be noted that after adjusting the position of the loading wheel 8, the rotating rod 75 can be rotated by 180 degrees again, and the handle 76 can be tightly matched with the notch of the locking ring 77 again, thereby locking the threaded rod 74, so that the threaded rod 74 cannot rotate. The threaded rod 74 cannot rotate, so that the adjusting rod 73 is locked in the adjusting groove 72, so that the loading wheel 8 does not displace after adjusting the position. If the handle 76 does not accurately correspond to the notch of the locking ring 77 after the rotating rod 75 is rotated, the rotating rod 75 can be rotated by a small angle, so that the handle 76 can accurately correspond to the notch of the locking ring 77, so that the handle 76 can be tightly matched with the notch. Rotating the rotating rod 75 by a small angle can drive the threaded rod 74 to rotate synchronously. The threaded rod 74 drives the adjusting rod 73 and the loading wheel 8 to move a short distance, which can be ignored and will not affect the test.

[0024] As Figure 8As shown, the loading wheel 8 is provided with a quick release assembly for quickly disassembling the loading wheel 8, the quick release assembly comprises a mounting groove 91 opened on the wheel frame of the loading wheel 8, two movable grooves 92 symmetrically opened on the wheel frame of the loading wheel 8 relative to the mounting groove 91, the two movable grooves 92 are both communicated with the inside of the mounting groove 91, the inside of the two movable grooves 92 are both fixedly connected with a spring 93, the two springs 93 are both fixedly connected with a clamping block 94 away from the end connected with the movable groove 92, and the two clamping blocks 94 are respectively slidably connected in the inside of the two movable grooves 92.

[0025] It should be noted that the mounting groove 91 is provided in T shape, which can be matched with the bottom of the adjusting rod 73, and the end of the two clamping blocks 94 located in the inside of the mounting groove 91 is provided with an inclined surface, which is used to push the clamping block 94 to slide into the inside of the movable groove 92 when the adjusting rod 73 slides into the inside of the mounting groove 91, the two clamping blocks 94 are both fixedly connected with a push plate 95, and the push plate 95 on the two clamping blocks 94 extends to the outside of the movable groove 92, which is convenient for manually pushing the two clamping blocks 94 to move in the inside of the movable groove 92.

[0026] Specifically, at present, different tire widths of vehicles will be encountered on asphalt roads to roll the asphalt pavement, and different tire widths of tires will produce uneven contact pressure and rolling area on the pavement, thereby affecting the local stress distribution, so it may be necessary to replace the loading wheel 8 of different widths during the test. The loading wheel 8 of the existing high-temperature rut test machine is fixed on the device by bolts, which is not convenient to disassemble. In this embodiment, when the loading wheel 8 needs to be replaced, the worker first pushes the two push plates 95 to the two sides, the two push plates 95 drive the two clamping blocks 94 to move, so that the two clamping blocks 94 respectively move in the two movable grooves 92 to the side close to the spring 93, and the two clamping blocks 94 will compress the two springs 93, when the two clamping blocks 94 completely slide into the two movable grooves 92, the loading wheel 8 can be pushed at this time, so that the loading wheel 8 slides on the bottom of the adjusting rod 73, and then the loading wheel 8 can be quickly removed, and the two push plates 95 are released after the loading wheel 8 is removed. Then the operator takes a new loading wheel 8, at this time the spring 93 is not compressed, aligns the mounting groove 91 on the loading wheel 8 with the bottom of the adjusting rod 73, and pushes the loading wheel 8, so that the adjusting rod 73 is clamped into the mounting groove 91 on the loading wheel 8. In this process, the adjusting rod 73 will push the inclined surface of the clamping block 94, so that the two clamping blocks 94 move to the inside of the movable groove 92 and compress the spring 93, when the adjusting rod 73 completely enters the inside of the mounting groove 91, the two clamping blocks 94 move to the inside of the mounting groove 91 under the elastic reset action of the spring 93, thereby limiting the adjusting rod 73 in the inside of the mounting groove 91, at this time the quick replacement of the loading wheel 8 is completed. By replacing the loading wheel 8 of different widths, the influence of tire width on the rut can be studied, and by designing the quick release assembly, the loading wheel 8 can be quickly replaced during the test, and the disassembly and assembly are more convenient.

[0027] As Figure 2 , Figure 5 , Figure 6 and Figure 9 shown, the adjusting frame 71 is provided with a cleaning assembly for removing the asphalt adhered on the loading wheel 8, the cleaning assembly comprising a fixed frame 101 fixedly connected on the adjusting frame 71, the bottom of the fixed frame 101 being provided with two sliding grooves 102, a collecting box 103 being slidingly connected between the two sliding grooves 102, the collecting box 103 being composed of a box body and a sliding strip, the sliding strip being slidingly connected in the sliding groove 102, the side of the collecting box 103 away from the adjusting frame 71 being fixedly connected with a handle 104. The side of the collecting box 103 close to the adjusting frame 71 is rotatably connected with a scraper 106, the scraper 106 being obliquely arranged, the top of the scraper 106 being in contact with the roller of the loading wheel 8, the rotatable connection between the scraper 106 and the collecting box 103 being provided with a torsional spring 105, the torsional spring 105 being used to make the scraper 106 always in contact with the roller of the loading wheel 8, the testing machine box 1 being fixedly connected with a collecting interface 107 corresponding in position to the collecting box 103.

[0028] It should be noted that the sliding strip of the collecting box 103 is made of rubber material, which is used to increase the friction between the sliding strip of the collecting box 103 and the sliding groove 102, and improve the stability of the collecting box 103 between the two sliding grooves 102. The testing machine box 1 is provided with a through hole corresponding in position to the collecting interface 107, the collecting interface 107 being connected in communication with the inside of the testing machine box 1 through the through hole, and a sealing plate 108 being rotatably connected at the opening on the side of the collecting interface 107, which is used to seal the collecting interface 107.

[0029] Specifically, at present, after the asphalt mixture is placed on the asphalt mold 12, it is directly subjected to high-temperature rutting test after being flattened. In this process, the asphalt on the asphalt mixture has not completely solidified, which causes part of the asphalt to adhere to the rolling surface of the loading wheel 8 in the process of repeated rolling. If the asphalt on the rolling surface of the loading wheel 8 accumulates more and more, a thickened cushion layer or a local protrusion will be formed, which will cause the pressure applied by the loading wheel 8 to the asphalt mixture in the asphalt mold 12 to increase, and thus will affect the accuracy of the asphalt mixture test. Therefore, the cleaning assembly is designed to ensure that the rolling surface of the loading wheel 8 does not adhere too much asphalt. In the process of rolling the asphalt mixture in the asphalt mold 12 by the roller of the loading wheel 8, the roller of the loading wheel 8 will rotate constantly. When the loading wheel 8 moves towards the side close to the collecting interface 107, i.e. at this time the roller of the loading wheel 8 rotates counterclockwise, the roller of the loading wheel 8 will push the scraper 106 to rotate, and the roller of the loading wheel 8 will be in contact with the collecting box 103 through the scraper 106. At this time, the roller of the loading wheel 8 will push the asphalt adhered on the rolling surface of the loading wheel 8 to the collecting box 103, and the asphalt will be collected in the collecting box 103. Figure 5As shown, the rollers of the loading wheel 8 are in counterclockwise rotation, and the scraper 106 is in contact with the rollers of the loading wheel 8, so that the scraper 106 scrapes off the asphalt adhered to the rollers of the loading wheel 8, and the scraped asphalt slides into the inside of the collecting box 103 under the guidance of the scraper 106, so that the asphalt adhered to the rolling surface of the loading wheel 8 is scraped off by the scraper 106, so as to prevent the rollers of the loading wheel 8 from forming a thickened cushion or a local protrusion due to too much asphalt adhered, and to avoid affecting the test effect, and to avoid wearing the rubber tire of the loading wheel 8, and to improve the service life of the loading wheel 8.

[0030] When the high-temperature rut test of the asphalt mixture is completed, the loading wheel 8 needs to be stopped near the collecting interface 107, the handle 104 on the collecting box 103 is just inserted into the through hole of the test machine box 1, then the sealing plate 108 on the collecting interface 107 is opened, i.e. the sealing plate 108 is turned up, then the worker holds the handle 104 and pulls the handle 104, so that the collecting box 103 is separated from the fixed frame 101, i.e. the collecting box 103 slides in the sliding groove 102 to the side near the collecting interface 107, and then the collecting box 103 is taken out of the collecting interface 107, so that the asphalt in the collecting box 103 can be cleaned, and then the collecting box 103 is horizontally placed into the inside of the test machine box 1 from the collecting interface 107, so that the collecting box 103 is again connected with the sliding groove 102, and the asphalt adhered to the loading wheel 8 can be cleaned for the next high-temperature rut test.

[0031] It should be noted that when the loading wheel 8 moves away from the collecting interface 107, the rollers of the loading wheel 8 rotate in the clockwise direction, and the scraper 106 does not scrape off the asphalt adhered to the rolling surface of the loading wheel 8.

[0032] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-temperature stability test device for ceramic fiber modified asphalt mixture, comprising a test case (1), wherein the four corners of the bottom of the test case (1) are fixedly connected to a base (2), two door panels (3) are rotatably connected to the test case (1), an oil cylinder (4) is fixedly connected to the top of the inner cavity of the test case (1), a mobile module (5) is fixedly connected to the telescopic shaft of the oil cylinder (4), a movable frame (6) is slidably connected to the bottom of the mobile module (5), a mounting seat (11) is fixedly connected to the inside of the test case (1), and an asphalt mold (12) is fixedly connected to the top of the mounting seat (11), characterized in that: An adjustment component is provided at the bottom of the movable frame (6); The adjustment assembly includes an adjustment frame (71) fixedly connected to the bottom of the movable frame (6), an adjustment slot (72) is provided at the bottom of the adjustment frame (71), an adjustment rod (73) is slidably connected inside the adjustment slot (72), and a loading wheel (8) is detachably connected to the bottom of the adjustment rod (73), and a threaded rod (74) is rotatably connected inside the adjustment slot (72), and the threaded rod (74) passes through the adjustment slot (72) and extends to the outside of the adjustment frame (71) and is rotatably connected to the rotating rod (75), and the end of the rotating rod (75) away from the threaded rod (74) is rotatably connected to the turning handle (76), and the end of the adjustment frame (71) close to the turning rod (75) is fixedly connected to a locking ring (77), and a plurality of notches are evenly provided on the outer edge of the locking ring (77), and the turning handle (76) can be embedded in the notch of the locking ring (77), and the turning handle (76) is tightly matched with the notch after being embedded in the notch.

2. The high temperature stability testing device for ceramic fiber modified asphalt mixture according to claim 1, characterized in that: The mobile module (5) includes a frame plate, a guide rod and a reciprocating mechanism. The frame plate is fixedly connected to the telescopic shaft of the oil cylinder (4). The guide rod is fixedly connected to the frame plate. The reciprocating mechanism drives the movable frame (6) to perform horizontal reciprocating motion on the guide rod. A radiation lamp and a temperature sensor are provided inside the test box (1). The wheel (8) consists of a wheel frame and a roller.

3. The high temperature stability testing device for ceramic fiber modified asphalt mixture according to claim 2, characterized in that: The adjusting groove (72) is set to be T-shaped, the adjusting rod (73) is set to be I-shaped, a threaded hole is opened at one end of the adjusting rod (73) located inside the adjusting groove (72), the threaded rod (74) is threadedly connected to the threaded hole of the adjusting rod (73), and the inner side wall of the notch of the locking ring (77) is provided with rubber.

4. The high temperature stability testing device for ceramic fiber modified asphalt mixture according to claim 3, characterized in that: The loading wheel (8) is provided with a quick-release assembly, which includes a mounting groove (91) and two movable grooves (92) provided on the wheel frame of the loading wheel (8). The two movable grooves (92) are respectively located on both sides of the mounting groove (91) and are both connected to the interior of the mounting groove (91). A spring (93) is fixedly connected to the interior of each of the two movable grooves (92). One end of each of the two springs (93) away from the end connected to the movable groove (92) is fixedly connected to a clamping block (94). The two clamping blocks (94) are respectively slidably connected to the interior of the two movable grooves (92).

5. The high temperature stability testing device for ceramic fiber modified asphalt mixture according to claim 4, characterized in that: The mounting groove (91) is set to be T-shaped, and one end of the two clamping blocks (94) located inside the mounting groove (91) is provided with an inclined surface, and the two clamping blocks (94) are fixedly connected to a dial plate (95), and the dial plates (95) on the two clamping blocks (94) extend to the outside of the movable groove (92).

6. The high temperature stability testing device for ceramic fiber modified asphalt mixture according to claim 5, characterized in that: A cleaning component is provided on the adjustment frame (71), and the cleaning component includes a fixed frame (101) fixedly connected to the adjustment frame (71), two slide grooves (102) are provided at the bottom of the fixed frame (101), and a collection box (103) is slidably connected between the two slide grooves (102), and a handle (104) is fixedly connected to the side of the collection box (103) away from the adjustment frame (71), and a scraper (106) is rotatably connected to the side of the collection box (103) close to the adjustment frame (71), and the top of the scraper (106) contacts the roller of the loading wheel (8), and a torsion spring (105) is provided at the rotation connection between the scraper (106) and the collection box (103), and a collection interface (107) is fixedly connected to the test chassis (1).

7. The high temperature stability testing device for ceramic fiber modified asphalt mixture according to claim 6, characterized in that: The collection box (103) is composed of a box body and a slide bar, the slide bar is slidably connected in the slide groove (102), the slide bar of the collection box (103) is set to a rubber material, a through hole corresponding to the position of the collection interface (107) is opened on the test chassis (1), the collection interface (107) is connected to the interior of the test chassis (1) through the through hole, and a sealing plate (108) is rotatably connected to the side opening of the collection interface (107).

8. The high temperature stability test method of ceramic fiber modified asphalt mixture is characterized by: Using the ceramic fiber modified asphalt mixture high temperature stability testing device as claimed in claim 7, the testing method comprises the following steps: Step 1: Clean the mounting seat (11) in the test chassis (1) to ensure that there is no residual asphalt or debris, confirm that the loading wheel (8) is in a locked state, confirm that the scraper (106) is tightly fitted to the rolling surface of the loading wheel (8), and check whether the collection box (103) is installed in place; Step 2: Pour the prepared ceramic fiber modified asphalt mixture into the asphalt mold (12), flatten it to the standard thickness, check the sealing performance of the edge of the asphalt mold (12) to prevent the mixture from overflowing during the test, open the door panel (3), loosen the fixing bolts of the mounting seat (11) and the asphalt mold (12), remove the old asphalt mold (12), place the new asphalt mold (12) filled with the mixture into the mounting seat (11) and install it firmly, ensure that the mold is stable and without shaking, close the door panel (3), check the sealing performance of the test chassis (1) to prevent temperature loss during the heating process; Step 3: Start the device, the telescopic shaft of the oil cylinder (4) drives the movable module (5) and the movable frame (6) to move downward, so that the loading wheel (8) contacts the surface of the mixture, applies pressure to the mixture, and at the same time, the radiation lamp heats the mixture. After the temperature stabilizes to the target value, the reciprocating mechanism of the movable module (5) is started to drive the movable frame (6) and the loading wheel (8) to roll back and forth in the horizontal direction; Step 4: The loading wheel (8) rolls back and forth at the initial position for a set number of times, and records the rutting depth and deformation rate in real time; Step 5: When the set number of times is completed, the turning handle (76) is turned to unlock the threaded rod (74), and then the rotating rod (75) is turned. The rotating rod (75) drives the threaded rod (74) to rotate, driving the adjusting rod (73) to slide in the adjusting groove (72) to adjust the position of the loading wheel (8), and then the rotating rod (75) is reset and locked; Step 6: Repeat steps 3 and 4, repeat the rolling test at the new location, simulate the stress conditions in different areas, and record the rutting data at multiple locations; Step 7: If it is necessary to simulate the effect of different tire widths on rutting, push the dial plate (95) on the loading wheel (8) to both sides so that the block (94) is retracted into the movable groove (92), and then the loading wheel (8) is removed by sliding along the mounting groove (91). The mounting groove (91) of the new loading wheel (8) is aligned with the bottom of the adjustment rod (73) and inserted. The block (94) is automatically locked under the action of the spring (93). Repeat steps 3 and 4 to complete the rolling test under different tire widths and study the effect of tire width on rutting. Step 8: During the rolling process, when the loading wheel (8) rotates counterclockwise, the scraper (106) automatically scrapes off the asphalt adhering to the rolling surface, and the scraped material slides into the collection box (103); Step 9: After the test is completed, the loading wheel (8) is stopped at the side of the collection interface (107), the sealing plate (108) is opened, the handle (104) is pulled out to extract the collection box (103), the asphalt residue inside the collection box (103) is cleaned, and then the collection box (103) is reset, the door panel (3) is closed, and the entire device is cleaned.

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