CN114383960B - Asphalt mixture rut resistance test device and application method thereof - Google Patents
Asphalt mixture rut resistance test device and application method thereof Download PDFInfo
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- CN114383960B CN114383960B CN202210067757.7A CN202210067757A CN114383960B CN 114383960 B CN114383960 B CN 114383960B CN 202210067757 A CN202210067757 A CN 202210067757A CN 114383960 B CN114383960 B CN 114383960B
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- 238000012360 testing method Methods 0.000 title claims abstract description 177
- 239000010426 asphalt Substances 0.000 title claims abstract description 120
- 239000000203 mixture Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 25
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 238000001556 precipitation Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 230000001808 coupling effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/0242—With circulation of a fluid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a testing device for rut resistance of an asphalt mixture and a using method thereof, wherein the testing device comprises a box body, and a testing platform is fixedly connected in the box body; a sample assembly is fixedly arranged on the test platform; two upright posts are symmetrically arranged on two sides of the sample assembly, and a test module is connected between the two upright posts in a sliding manner; the test module comprises a cross beam which is connected between the two upright posts in a sliding way; the bottom end of the cross beam is fixedly connected with a slide bar; the bottom end of the sliding rod is fixedly connected with a limit frame; the slide bar is sleeved with a sliding connection test assembly; the side wall of the test assembly is abutted with the inner wall of the limit frame; the bottom end of the test assembly is abutted with the top end of the sample assembly; an environment simulation assembly is arranged in the box body; the environment simulation assembly is electrically connected with a control panel. The invention has simple structure and convenient use, can simulate the anti-rutting capability of the asphalt pavement under various external environment coupling states to test, provides data for reducing the generation of rutting of the asphalt pavement, and provides an improvement direction.
Description
Technical Field
The invention relates to the technical field of pavement design, in particular to a rut resistance test device for asphalt mixtures and a use method thereof.
Background
Along with the large-scale construction of highways in China, the service performance of asphalt pavements is more and more emphasized, and the functional design of asphalt pavements mainly aims at structural functions such as rut resistance, fatigue resistance and the like and use functions such as skid resistance, drainage, wear resistance and the like. Rutting affects the flatness of the road surface, so that the travelling comfort is reduced, the service life of the road surface is reduced, the travelling safety is seriously affected, the road section of a larger rutting is difficult to control, the road surface is not smooth in drainage in rainy days, the vehicle is easy to float and slide to affect the safety of high-speed travelling, the rutting is a main disease of the highway asphalt road surface, the rutting is mainly generated in permanent deformation of asphalt mixture at high temperature, a rutting test is a simple and easy method for evaluating the high-mixing deformation of the asphalt mixture, and the rutting test is listed into standard specifications in China at present.
However, the conventional rutting tester generally only can test the rutting resistance of the asphalt mixture under a single high-temperature condition, but cannot test the rutting resistance of the asphalt pavement under rainfall and windy weather, so that the obtained data are inconsistent with the use condition of the highway asphalt pavement in the actual environment, and the obtained parameter reference effect is low; therefore, a test device for testing the rut resistance of asphalt mixtures under various coupling conditions is needed.
Disclosure of Invention
The invention aims to provide a rut resistance test device for asphalt mixtures and a use method thereof, so as to solve the problems in the prior art.
In order to achieve the above object, the present invention provides the following solutions: the invention provides an asphalt mixture rut resistance test device, which comprises a box body, wherein a test platform is fixedly connected in the box body; the test platform is fixedly provided with a sample assembly;
two upright posts are symmetrically arranged on two sides of the sample assembly, and a test module is connected between the two upright posts in a sliding manner;
the test module comprises a cross beam which is connected between the two upright posts in a sliding way; a sliding rod is fixedly connected to the bottom end of the cross beam; a limiting frame is fixedly connected to the bottom end of the sliding rod; the slide bar is sleeved with a test assembly in a sliding way; the side wall of the test assembly is abutted with the inner wall of the limit frame; the bottom end of the test assembly is abutted with the top end of the sample assembly;
an environment simulation assembly is arranged in the box body; the environment simulation assembly is electrically connected with a control panel.
Preferably, the sample assembly comprises a sample die, and an asphalt sample is fixedly connected in an inner cavity of the sample die; the sample die is fixedly connected with the top surface of the test platform through a plurality of locking components.
Preferably, the locking assembly comprises an adjusting screw rod fixedly connected with the top surface of the test platform, and an adjusting nut is connected to the adjusting screw rod in a threaded manner; the top end of the adjusting screw is fixedly connected with a screw sleeve; the screw sleeve faces the side wall of the sample mold; the screw sleeve is internally and in threaded connection with a locking screw rod, and the locking screw rod is in threaded connection with a screw hole on the side wall of the sample die.
Preferably, the test assembly comprises a test wheel abutting the top surface of the asphalt sample; an output shaft of a test motor is fixedly connected to one end of a center shaft of the test wheel; a guard board is rotatably connected to the center shaft; the test motor is fixedly connected with the guard board; a connecting rod is fixedly connected to the top end of the guard plate; the top end of the connecting rod is fixedly connected with a sliding sleeve, the sliding sleeve is sleeved on the sliding rod, and the sliding sleeve is in sliding connection with the sliding rod; the side wall symmetry rigid coupling of connecting rod has two bracing pieces, two the bracing piece is kept away from the one end of connecting rod respectively with the inner wall sliding connection of spacing frame.
Preferably, a plurality of balls are arranged between the inner wall of the sliding sleeve and the outer wall of the sliding rod in an array manner; the ball is in rolling contact with the inner wall of the sliding sleeve and the outer wall of the sliding rod respectively.
Preferably, the limit frame comprises an outer frame, and the top surface of the outer frame is fixedly connected with the bottom end of the slide bar through symmetrically arranged limit rods; the motion trail of the connecting rod is positioned on the central axis of the outer frame; a limit groove is formed in the inner wall of the edge of the outer frame, which is parallel to the movement direction of the connecting rod; the tail end of the supporting rod is connected in the limiting groove in a sliding mode.
Preferably, a plurality of force application devices are symmetrically connected between the cross beam and the sliding rod, and the fixed ends of the force application devices are fixedly connected to the bottom end of the cross beam; the output end of the force application device is fixedly connected with the top surface of the sliding rod; the force application devices are electrically connected with the control panel.
Preferably, the environment simulation assembly comprises a heating device arranged in the top end of the inner cavity of the box body; the two side walls of the box body in the movement direction of the connecting rod are respectively provided with a wind simulation device; the top surface of the test platform is fixedly provided with a water pump, an inlet of the water pump stretches into a water tank below the test platform, an outlet of the water pump is communicated with a spray head, and the spray head faces the asphalt sample; the control panel is respectively and electrically connected with the heating device, the wind simulation device and the water suction pump.
The application method of the asphalt mixture rut resistance test device comprises the following application steps:
A. manufacturing an asphalt sample;
B. mounting an asphalt sample;
C. preheating a test device;
D. testing the rut resistance of the asphalt sample;
E. experimental data were recorded.
Preferably, in the step D, the asphalt sample anti-rutting test includes, but is not limited to, coupling of high temperature and precipitation, coupling of precipitation and wind, and coupling of high Wen Hefeng.
The invention discloses the following technical effects: the invention discloses an asphalt mixture rut resistance test device and a use method thereof, wherein a manufactured sample assembly is fixed on a test platform in a box body, the bottom end of the test assembly is rolled on the top end of the sample assembly, and the state that wheels are rolled on an asphalt pavement is simulated; the test assembly rolls on the top surface of the sample assembly to simulate the running state of the vehicle on the asphalt pavement; the environment simulation component is used for simulating the state of an actual environment, carrying out the coupling state in the aspects of temperature, wind speed, precipitation and the like, simulating the track generation speed of a vehicle in the actual use process of the asphalt pavement, overcoming the track generation speed, improving the track resistance of the asphalt pavement, prolonging the service life of the asphalt pavement, reducing the accident amount caused by the track and protecting the life safety of a driver; the crossbeam can exert different pressures to the slide bar fixed below the crossbeam, and the slide bar acts on the test assembly with pressure, simulates the influence that the vehicle of different loads produced to bituminous paving rut. The invention has simple structure and convenient use, can simulate the anti-rutting capability of the asphalt pavement in various external environment coupling states to test, provides data for reducing the generation of rutting of the asphalt pavement, and provides an improvement direction; the service life of the asphalt pavement is prolonged, the safety accidents caused by rutting of the asphalt pavement are reduced, and the life safety of drivers and passengers is protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a device for testing rut resistance of an asphalt mixture according to the invention;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is a schematic view of the structure of the test assembly of the present invention;
FIG. 4 is a schematic view of a limiting frame according to the present invention;
FIG. 5 is an enlarged view of a portion of B in FIG. 3;
wherein, 1, the box body; 2. a test platform; 3. a column; 4. a cross beam; 5. a slide bar; 6. a limit frame; 7. a control panel; 8. a sample mold; 9. an asphalt sample; 10. adjusting a screw; 11. an adjusting nut; 12. a screw sleeve; 13. locking the screw rod; 14. a screw hole; 15. a test wheel; 16. a center shaft; 17. testing a motor; 18. a guard board; 19. a connecting rod; 20. a sliding sleeve; 21. a support rod; 22. a ball; 23. an outer frame; 24. a limit rod; 25. a limit groove; 26. a heating device; 27. a wind simulation device; 28. a water pump; 29. a water tank; 30. a spray head; 31. a force application device; 32. a mounting plate; 33. a bearing; 34. an air duct; 35. a fan; 36. a hinged door; 37. a temperature sensor; 38. a humidity sensor; 39. an electric push rod; 40. a pressure sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-5, the invention provides a rut resistance test device of an asphalt mixture, which comprises a box body 1, wherein a test platform 2 is fixedly connected in the box body 1; a sample assembly is fixedly arranged on the test platform 2;
two upright posts 3 are symmetrically arranged on two sides of the sample assembly, and a test module is connected between the two upright posts 3 in a sliding manner;
the test module comprises a cross beam 4 which is connected between two upright posts 3 in a sliding way; the bottom end of the cross beam 4 is fixedly connected with a slide bar 5; the bottom end of the slide bar 5 is fixedly connected with a limit frame 6; the slide bar 5 is sleeved with a sliding connection test assembly; the side wall of the test assembly is abutted with the inner wall of the limit frame 6; the bottom end of the test assembly is abutted with the top end of the sample assembly;
an environment simulation assembly is arranged in the box body 1; the environment simulation component is electrically connected with a control panel 7.
The manufactured sample assembly is fixed on a test platform 2 in a box body 1, the bottom end of the test assembly is rolled on the top end of the sample assembly, and the state that wheels are rolled on an asphalt pavement is simulated; the test assembly rolls on the top surface of the sample assembly to simulate the running state of the vehicle on the asphalt pavement; the environment simulation component is used for simulating the state of an actual environment, carrying out the coupling state in the aspects of temperature, wind speed, precipitation and the like, simulating the track generation speed of a vehicle in the actual use process of the asphalt pavement, overcoming the track generation speed, improving the track resistance of the asphalt pavement, prolonging the service life of the asphalt pavement, reducing the accident amount caused by the track and protecting the life safety of a driver; the cross beam 4 can apply different pressures to the sliding rod 5 fixed below the cross beam, the sliding rod 5 acts the pressure on the test assembly, and the influence of vehicles with different loads on the rutting of the asphalt pavement is simulated.
Further, the upright post 3 is connected with a sliding block in a sliding way to form a longitudinal rodless cylinder; the side wall of the sliding block is fixedly connected with the end head of the cross beam 4; the slide block moves up and down on the upright post 3, and then drives the cross beam 4 to move, so that the slide rod 5 below the cross beam 4 and the test assembly below the slide rod 5 are lifted simultaneously, and the test assembly is convenient to install and detach.
In a further optimization scheme, the sample assembly comprises a sample die 8, and an asphalt sample 9 is fixedly embedded in the inner cavity of the sample die 8; the sample mould 8 is fixedly connected with the top surface of the test platform 2 through a plurality of locking components. The sample mold 8 is used for manufacturing a standard-size asphalt sample 9, when in use, mixed and stirred molten asphalt is poured into the inner cavity of the sample mold 8, then the top surface of the poured asphalt is smoothed, the top surface of the asphalt is 2cm-3cm higher than the top surface of the sample mold 8, and then the asphalt is left to stand until the molten asphalt becomes cool and hard, so that the asphalt sample 9 is formed; during the test, the asphalt sample 9 was not taken out of the sample mold 8. The top surface of the asphalt sample 9 is higher than the top surface of the sample mold 8, so that the test assembly is not influenced by the sample mold 8 and further influences the test result when the top surface of the asphalt sample 9 is rolled to generate ruts during the test.
Further, the standard dimensions of the asphalt sample 9 were 300mm×300mm×50mm, according to the standard.
Further, after asphalt casting, standing is required for 24-48 hours, and maintenance is carried out according to a conventional asphalt pavement maintenance method during standing, so that the hardness of an asphalt sample 9 is ensured to be the same as that of a real asphalt pavement, and the test result is more accurate.
In a further optimized scheme, the locking assembly comprises an adjusting screw rod 10 fixedly connected with the top surface of the test platform 2, and an adjusting nut 11 is connected to the adjusting screw rod 10 in a threaded manner; the top end of the adjusting screw rod 10 is fixedly connected with a screw sleeve 12; the screw sleeve 12 faces the side wall of the sample mold 8; the screw sleeve 12 is internally and in threaded connection with a locking screw rod 13, and the locking screw rod 13 is in threaded connection with a screw hole 14 on the side wall of the sample die 8. The locking component aims at fixing the sample die 8 on the test platform 2 and preventing the asphalt sample 9 and the sample die 8 from being deviated to influence the test result when the test component rolls the asphalt sample 9; when the asphalt sample mold is used, firstly, the manufactured sample mold 8 with the asphalt sample 9 is placed on the top surface of the test platform 2, and the screw hole 14 on the side wall of the sample mold 8 and the screw sleeve 12 have the same direction; and (3) rotating the locking screw 13 to enable the locking screw 13 to move towards the sample die 8, and rotating the adjusting nut 11 to adjust the height of the screw sleeve 12 after the locking screw 13 abuts against the sample die 8 until the locking screw 13 is coaxial with the screw hole 14, and rotating the locking screw 13 again to load the locking screw 13 into the screw hole 14 so as to finish the fixation of the sample die 8.
Further, the locking assemblies are preferably four, and are respectively arranged at two sides of the sample mold 8 opposite to the movement direction of the test assembly, so that the test assembly is prevented from rolling the asphalt sample 9 to cause displacement.
Further, in order to further fix the sample mold 8, a groove adapted to the sample mold 8 is formed in the top surface of the test platform 2, and the adjusting screw 10 is disposed outside the groove and aligned with the screw hole 14 on the side wall of the sample mold 8.
Further, the adjusting screw 10 includes two short screws with opposite threads, the short screw at the lower end is fixed on the top surface of the test platform 2, and when the adjusting nut 11 is rotated, the adjusting nut 11 is screwed in or out simultaneously due to the opposite threads of the two short screws, so as to adjust the height of the screw sleeve 12.
Further optimizing scheme, the test assembly comprises a test wheel 15 which is abutted with the top surface of the asphalt sample 9; one end of a center shaft 16 of the test wheel 15 is fixedly connected with an output shaft of a test motor 17; the middle shaft 16 is rotatably connected with a guard plate 18; the test motor 17 is fixedly connected with the guard plate 18; the top end of the guard plate 18 is fixedly connected with a connecting rod 19; the top end of the connecting rod 19 is fixedly connected with a sliding sleeve 20, the sliding sleeve 20 is sleeved on the sliding rod 5, and the sliding sleeve 20 is in sliding connection with the sliding rod 5; the side wall symmetry rigid coupling of connecting rod 19 has two bracing pieces 21, and the one end that two bracing pieces 21 kept away from connecting rod 19 is connected with the inner wall sliding of spacing frame 6 respectively. Compared with the prior art, the invention sets the power of the test wheel 15 on the test wheel 15, and more truly simulates the running process of the vehicle. When the test motor 17 rotates, an output shaft of the test motor 17 drives the center shaft 16 to rotate, and the center shaft 16 drives the test wheels 15 to rotate, so that the vehicle is simulated to run on an asphalt pavement; when the test wheel 15 moves forwards, the connecting rod 19 is driven by the guard plate 18 to move together, the connecting rod 19 drives the sliding sleeve 20 to slide on the sliding rod 5, and the movement direction of the test wheel 15 is limited, so that the test wheel 15 keeps straight running; the supporting rods 21 on the side walls of the connecting rods 19 are supported to the inner edge of the limiting frame 6, so that the test wheels 15 are prevented from deflecting when the cross beam 4 applies force to the sliding rods 5.
Further, the outer wall of the guard plate 18 is vertically and fixedly connected with a mounting plate 32, and the test motor 17 is fixedly mounted on the mounting plate 32.
Further, bearings 33 are respectively arranged at two ends of the central shaft 16, an inner ring of each bearing 33 is fixedly connected with the central shaft 16, and an outer wall of each bearing 33 is fixedly connected with the bottom end of the guard plate 18.
In a further optimization scheme, a plurality of balls 22 are arranged between the inner wall of the sliding sleeve 20 and the outer wall of the sliding rod 5 in an array manner; the balls 22 are respectively in rolling contact with the inner wall of the sliding sleeve 20 and the outer wall of the sliding rod 5. The purpose of the ball 22 arranged between the sliding sleeve 20 and the sliding rod 5 is to change sliding friction between the sliding sleeve and the sliding rod into rolling friction, so that the power loss of friction force is reduced; the conversion of sliding friction into rolling friction to reduce friction is a common method for reducing power loss, which is the prior art and will not be described in detail.
In a further optimized scheme, the limit frame 6 comprises an outer frame 23, and the top surface of the outer frame 23 is fixedly connected with the bottom end of the slide bar 5 through limit rods 24 symmetrically arranged; the motion track of the connecting rod 19 is positioned on the central axis 16 of the outer frame 23; the inner wall of the side of the outer frame 23 parallel to the movement direction of the connecting rod 19 is provided with a limit groove 25; the tail end of the supporting rod 21 is connected in the limit groove 25 in a sliding way. The limiting rod 24 is fixed on the lower end face of the two ends of the slide rod 5, the other end of the limiting rod 24 is fixedly connected with the outer frame 23, limiting grooves 25 are formed in the inner walls of the two sides of the outer frame 23 parallel to the movement direction of the connecting rod 19, the tail end of the supporting rod 21 is inserted into the limiting grooves 25, and the supporting connecting rod 19 cannot deflect under the action of pressure.
Further, the end of the supporting rod 21 is also provided with a plurality of balls 22 for converting the sliding friction between the supporting rod 21 and the limiting groove 25 into rolling friction, which is a conventional technology and will not be described in detail.
In a further optimization scheme, a plurality of force application devices 31 are symmetrically connected between the cross beam 4 and the slide bar 5, and the fixed ends of the force application devices 31 are fixedly connected to the bottom end of the cross beam 4; the output end of the force application device 31 is fixedly connected with the top surface of the slide bar 5; the force applying devices 31 are electrically connected with the control panel 7. The force application device 31 includes, but is not limited to, a hydraulic rod and an electric rod, and applies pressure to the slide rod 5 under the action of the control panel 7, so that a certain pressure exists between the test wheel 15 and the asphalt sample 9, and the capacity of the vehicle with different loads to generate ruts is simulated.
Further, an electric push rod 39 is fixedly connected to one end of the slide rod 5 in the advancing direction of the test wheel 15, the fixed end of the electric push rod 39 is fixedly connected with the top surface of the slide rod 5, and the output end of the electric push rod 39 extends to the sliding sleeve 20 and is abutted to the end surface of the sliding sleeve 20; the electric push rod 39 is used for pushing the test assembly back to the starting point when the test wheel 15 moves to the tail end of the asphalt sample 9, and the test wheel 15 moves unidirectionally without reciprocating to crush the asphalt sample 9, so that the unidirectional running of vehicles on a road is simulated.
Further optimizing scheme, the environment simulation assembly comprises a heating device 26 arranged in the top end of the inner cavity of the box body 1; the two side walls of the box body 1 in the movement direction of the connecting rod 19 are respectively provided with a wind simulation device 27; the top surface of the test platform 2 is fixedly provided with a water suction pump 28, an inlet of the water suction pump 28 stretches into a water tank 29 under the test platform 2, an outlet of the water suction pump 28 is communicated with a spray head 30, and the spray head 30 faces the asphalt sample 9; the control panel 7 is electrically connected with the heating device 26, the wind simulation device 27 and the water suction pump 28 respectively. The electric heating device is used for adjusting the temperature of the inner cavity of the box body 1, the wind simulation device 27 is used for simulating the condition that wind exists in the nature, the water pump 28 pumps water in the water tank 29 to be sprayed on the asphalt sample 9 through the spray head 30, and the rainfall condition in the nature is simulated; under various condition coupling, the service condition of the asphalt pavement in nature is simulated more truly, and more real data is obtained.
Further, the heating device 26 can be coupled with the water pump 28 and the spray head 30 to manufacture a test temperature of 5-75 ℃, and the annual temperature distribution in the south area is simulated by a change gradient of 1-2 ℃; meanwhile, the water pump 28 and the spray head 30 are matched, and the wind simulation device 27 fully simulates the influence of the rain-heat coupling effect of the windy and rainy climates in the south of China on the rut resistance of the road, so that the rut resistance of the asphalt road of the south road is tested more practically.
Further, a temperature sensor 37 and a humidity sensor 38 are installed in the case 1 for monitoring the temperature and humidity in the case 1.
Further, a through hole for communicating with the water tank 29 is formed in the test platform 2, and water sprayed from the spray head 30 wets the asphalt sample 9 and flows into the water tank 29 from the through hole.
Further, the wind simulation device 27 comprises an air duct 34 communicated with two sides of the box body 1, a fan 35 with a reversing function is fixedly installed in the air duct 34, and a hinged door 36 is installed at the tail end of the air duct 34, so that the air simulation device is convenient to open and close, ventilates the box body 1, and then enables wind to flow in the box body 1.
Further, the control panel 7 is provided with a display module and a PLC control module, the PLC control module controls each element electrically connected with the PLC control module to work through programming, and the display module is used for displaying each item of data in the box 1.
Further, a pressure sensor 40 is arranged between the sliding sleeve 20 and the sliding rod 5, and the pressure between the sliding sleeve 20 and the sliding rod 5 is the same as the pressure between the test wheel 15 and the asphalt sample 9; the pressure sensor 40 is electrically connected to the control panel 7 for detecting the pressure between the asphalt sample 9 and the test wheel 15.
The application method of the asphalt mixture rut resistance test device comprises the following application steps:
A. preparing an asphalt sample 9; cleaning the inner cavity of the sample die 8, pouring mixed and stirred molten asphalt into the inner cavity of the sample die 8, trowelling the top surface of the poured asphalt to make the top surface of the asphalt 2cm-3cm higher than the top surface of the sample die 8, and standing for 24-48 h until the molten asphalt becomes cool and hard to form an asphalt sample 9;
B. mounting an asphalt sample 9; the sample mould 8 and the asphalt sample 9 in the sample mould 8 are carried onto the test platform 2 together and placed into a groove of the test platform 2, so that screw holes 14 on the side wall of the sample mould 8 are aligned with the adjusting screw 10; rotating the locking screw rod 13 to enable the locking screw rod 13 to move towards the sample die 8, rotating the adjusting nut 11 to adjust the height of the screw sleeve 12 after the locking screw rod 13 abuts against the sample die 8 until the locking screw rod 13 is coaxial with the screw hole 14, and rotating the locking screw rod 13 again to screw the locking screw rod into the screw hole 14 to finish the fixation of the sample die 8;
C. preheating a test device; the heating device 26 is controlled to work through the control panel 7 until the temperature reaches the preset temperature, and then the asphalt sample 9 is kept stand for 1-2 h to make the internal and external temperatures the same;
D. testing the rut resistance of an asphalt sample 9; according to a preset test, the heating device 26 is controlled to keep the temperature in the box body 1, and then the operation of the water suction pump 28 and the fan 35 is controlled to form a preset coupling environment with wind blowing, rain blowing and wind and rain blowing; then starting a rodless cylinder, lowering the test wheel 15 to prop against the top surface of the asphalt sample 9, pressurizing by a force application device 31 according to the designed pressure, and controlling a test motor 17 to start after pressurizing, so as to drive a center shaft 16 of the test wheel 15 to rotate, and enabling the test wheel 15 to roll and advance on the top surface of the asphalt sample 9; when the device moves to the tail end of the asphalt sample 9, the rodless cylinder drives the test wheel 15 to lift away from the asphalt sample 9, and the electric push rod 39 stretches to push the sliding sleeve 20 away so that the sliding sleeve drives the test wheel 15 to move to the other end of the asphalt sample 9; then the test wheel 15 is controlled to descend again until the pressure in the test wheel 15 is the same as the designed pressure, and the test motor 17 drives the test wheel 15 to advance and reciprocate, so that the movement direction of the test wheel 15 is the same when the test wheel 15 contacts with the asphalt sample 9; the speed and the reciprocating frequency of the wheels are carried out according to preset test steps; until rutting of not less than 25mm appears on the surface of the asphalt sample 9 or the test is carried out for 1 hour. Reciprocating test, the annual temperature distribution in the south area is simulated by using a change gradient of 1-2 ℃ so as to fully simulate the influence of the rain-heat coupling effect in the south area on the rutting resistance of the road surface, and the test data is more authoritative.
E. Recording experimental data; experimental data including the depth of rutting, the number of movements of the test wheel 15, the temperature in the tank 1, humidity, wind speed, and the pressure at which the test wheel 15 can be applied to the asphalt sample 9 are recorded.
The invention has simple structure and convenient use, can simulate the anti-rutting capability of the asphalt pavement in various external environment coupling states to test, provides data for reducing the generation of rutting of the asphalt pavement, and provides an improvement direction; the service life of the asphalt pavement is prolonged, the safety accidents caused by rutting of the asphalt pavement are reduced, and the life safety of drivers and passengers is protected.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The foregoing embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but various modifications and improvements made by those skilled in the art to which the present invention pertains are made without departing from the spirit of the present invention, and all changes and modifications and improvements fall within the scope of the present invention as defined in the appended claims.
Claims (5)
1. An asphalt mixture anti-rutting capability test device is characterized in that: the test device comprises a box body (1), wherein a test platform (2) is fixedly connected in the box body (1); a sample assembly is fixedly arranged on the test platform (2);
two upright posts (3) are symmetrically arranged on two sides of the sample assembly, and a test module is connected between the two upright posts (3) in a sliding manner;
the test module comprises a cross beam (4) which is connected between the two upright posts (3) in a sliding way; a sliding rod (5) is fixedly connected to the bottom end of the cross beam (4); a limiting frame (6) is fixedly connected to the bottom end of the sliding rod (5); the slide bar (5) is sleeved with a test assembly in a sliding way; the side wall of the test assembly is abutted with the inner wall of the limit frame (6); the bottom end of the test assembly is abutted with the top end of the sample assembly;
an environment simulation assembly is arranged in the box body (1); the environment simulation assembly is electrically connected with a control panel (7);
the sample assembly comprises a sample die (8), and an asphalt sample (9) is fixedly embedded in the inner cavity of the sample die (8); the sample die (8) is fixedly connected with the top surface of the test platform (2) through a plurality of locking components;
the test assembly comprises a test wheel (15) which is abutted with the top surface of the asphalt sample (9); one end of a center shaft (16) of the test wheel (15) is fixedly connected with an output shaft of a test motor (17); a guard board (18) is rotatably connected to the center shaft (16); the test motor (17) is fixedly connected with the guard plate (18); a connecting rod (19) is fixedly connected to the top end of the guard plate (18); a sliding sleeve (20) is fixedly connected to the top end of the connecting rod (19), the sliding sleeve (20) is sleeved on the sliding rod (5), and the sliding sleeve (20) is in sliding connection with the sliding rod (5); two support rods (21) are symmetrically and fixedly connected to the side wall of the connecting rod (19), and one ends, far away from the connecting rod (19), of the two support rods (21) are respectively connected with the inner wall of the limiting frame (6) in a sliding manner;
an electric push rod (39) is fixedly connected to one end of the slide rod (5) in the advancing direction of the test wheel (15), the fixed end of the electric push rod (39) is fixedly connected with the top surface of the slide rod (5), and the output end of the electric push rod (39) extends to the sliding sleeve (20) and is abutted to the end surface of the sliding sleeve (20);
a plurality of force application devices (31) are symmetrically connected between the cross beam (4) and the sliding rod (5), and the fixed ends of the force application devices (31) are fixedly connected to the bottom end of the cross beam (4); the output end of the force application device (31) is fixedly connected with the top surface of the sliding rod (5); the force application devices (31) are electrically connected with the control panel (7);
the environment simulation assembly comprises a heating device (26) arranged in the top end of the inner cavity of the box body (1); the two side walls of the box body (1) in the movement direction of the connecting rod (19) are respectively provided with a wind simulation device (27); the top surface of the test platform (2) is fixedly provided with a water suction pump (28), an inlet of the water suction pump (28) stretches into a water tank (29) below the test platform (2), an outlet of the water suction pump (28) is communicated with a spray head (30), and the spray head (30) faces the asphalt sample (9); the control panel (7) is respectively and electrically connected with the heating device (26), the wind simulation device (27) and the water suction pump (28);
the application method of the asphalt mixture rut resistance test device comprises the following application steps:
A. preparing an asphalt sample (9);
B. an asphalt sample (9) is installed;
C. preheating a test device;
D. testing the rut resistance of the asphalt sample (9); according to a preset test, controlling the heating device (26) to keep the temperature in the box body (1), and then controlling the water suction pump (28) and the wind simulation device (27) to work so as to form a preset coupling environment with wind blowing, rain blowing and wind and rain blowing; then starting a rodless cylinder, descending the test wheel (15) to prop against the top surface of the asphalt sample (9), pressurizing through the force application device (31) according to the designed pressure, and controlling the test motor (17) to start after pressurizing, so as to drive the center shaft (16) of the test wheel (15) to rotate, and enabling the test wheel (15) to roll and advance on the top surface of the asphalt sample (9); when the device moves to the tail end of the asphalt sample (9), the rodless cylinder drives the test wheel (15) to lift away from the asphalt sample (9), and the electric push rod (39) stretches to push the sliding sleeve (20) away so as to drive the test wheel (15) to move to the other end of the asphalt sample (9); then the test wheel (15) is controlled to descend again until the pressure in the test wheel (15) is the same as the designed pressure, and the test motor (17) drives the test wheel (15) to advance again for reciprocating circulation, so that the movement direction of the test wheel (15) is the same when the test wheel is in contact with the asphalt sample (9); the speed and the reciprocation frequency of the test wheel (15) are carried out according to preset test steps; until rutting of not less than 25mm appears on the surface of the asphalt sample (9) or the test is carried out for 1 h; reciprocating test, simulating annual temperature distribution in the south area by using a change gradient of 1-2 ℃ to fully simulate the influence of the rain-heat coupling effect in the south area of China on the rutting resistance of the road surface, so that test data are more authoritative;
E. experimental data were recorded.
2. The asphalt mixture rut resistance test apparatus according to claim 1, wherein: the locking assembly comprises an adjusting screw (10) fixedly connected with the top surface of the test platform (2), and an adjusting nut (11) is connected to the adjusting screw (10) in a threaded manner; the top end of the adjusting screw (10) is fixedly connected with a screw sleeve (12); the screw sleeve (12) faces the side wall of the sample mould (8); the screw sleeve (12) is internally connected with a locking screw rod (13) in a threaded manner, and the locking screw rod (13) is in threaded connection with a screw hole (14) on the side wall of the sample die (8).
3. The asphalt mixture rut resistance test apparatus according to claim 1, wherein: a plurality of balls (22) are arranged between the inner wall of the sliding sleeve (20) and the outer wall of the sliding rod (5) in an array manner; the ball (22) is in rolling contact with the inner wall of the sliding sleeve (20) and the outer wall of the sliding rod (5) respectively.
4. The asphalt mixture rut resistance test apparatus according to claim 1, wherein: the limiting frame (6) comprises an outer frame (23), and the top surface of the outer frame (23) is fixedly connected with the bottom end of the sliding rod (5) through symmetrically arranged limiting rods (24); the motion track of the connecting rod (19) is positioned on the line of a center shaft (16) of the outer frame (23); limit grooves (25) are formed in the inner walls of the edges of the outer frame (23) parallel to the movement direction of the connecting rod (19); the tail end of the supporting rod (21) is connected in the limiting groove (25) in a sliding mode.
5. The asphalt mixture rut resistance test apparatus according to claim 1, wherein: in step D, the asphalt sample (9) anti-rutting test includes, but is not limited to, coupling of high temperature and precipitation, coupling of precipitation and wind, and coupling of high Wen Hefeng.
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| CN114965238A (en) * | 2022-05-24 | 2022-08-30 | 广西北投交通养护科技集团有限公司 | Leaching device for harmful components of road materials and leaching method for simulating rainwater environment |
| CN116930470B (en) * | 2023-04-24 | 2025-12-30 | 嘉兴市卓越交通建设检测有限公司 | A device for testing the performance of asphalt mixtures |
| CN118424861B (en) * | 2024-03-28 | 2024-12-03 | 应急管理部国家自然灾害防治研究院 | Coarse-grained soil dynamic humidification test device |
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