Aggregate and asphalt interface self-healing evaluation device

Abstract

The utility model relates to the technical field of road engineering, in particular to an aggregate and asphalt interface self-healing evaluation device which comprises a dynamic shear rheometer, the top in the dynamic shear rheometer is detachably connected with a first clamp, and the bottom in the dynamic shear rheometer is detachably connected with a second clamp. According to the method, the corresponding materials can be effectively sorted, so that the combination between the materials and the asphalt is effectively realized, the materials are provided for self-healing evaluation, the quality of the materials during evaluation is ensured to meet the requirements, the quality of data obtained by evaluation is fully ensured, the difference of different lithologic aggregates on the self-healing performance of the asphalt interface can be accurately evaluated, and the self-healing performance of the asphalt interface is improved. The selection of aggregate and asphalt is optimized, and the overall fatigue resistance and durability of the asphalt pavement are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of road engineering, in particular to a device for evaluating the self-healing property of an aggregate and asphalt interface. Background Art

[0002] In recent years, with the rapid development of my country's road transportation industry, various forms of damage have occurred to a considerable extent on the road surface under the increasing traffic pressure. During their service life, roads not only have to withstand the repeated effects of tension, compression and shear of vehicle loads, but are also affected by changes in ambient temperature. Under the coupling effect of the above two factors, the asphalt pavement structure is easily damaged by cracking, which greatly reduces the service life of the asphalt pavement and seriously affects driving safety.

[0003] Asphalt, the primary material for asphalt pavements, has a strong healing capacity due to its diffusion and flow properties. Asphalt mixtures used in pavement construction also possess self-healing capabilities, and this ability is closely related to the self-healing properties of asphalt mixtures. Two common types of self-healing mechanisms in asphalt concrete are adhesion healing and cohesive healing. Cohesive healing is the healing process of microcracks within the asphalt, while adhesion healing occurs when the adhesive-aggregate interface debonds.

[0004] In recent years, domestic and foreign scholars have conducted a lot of research on the self-healing properties of asphalt, and verified it through tensile tests, dynamic shear rheology, and atomic force microscopy. For example, CN107422034B (an asphalt-aggregate interface fatigue test method based on ultrasonic method, published on 2020-03-31), CN114563284A (an asphalt-aggregate interface damage and self-repair effect evaluation method, published on 2022-05-31). However, these evaluation methods are to infer the self-healing properties of asphalt through macroscopic and microscopic methods. For example, the maximum bonding force of the asphalt-aggregate interface is obtained by ultrasonic method. The interface adhesion and fatigue characteristics are unified, and their internal relationship is studied and analyzed on the basis of obtaining the maximum interface adhesion, or the contact angles between distilled water, n-heptane, glycerol with known surface energy and asphalt and aggregate are measured, the surface energy of asphalt and aggregate is calculated, and then the Gibbs free energy of asphalt, water and aggregate is calculated to determine the degree to which the asphalt mixture is susceptible to water damage, and the surface energy parameters of asphalt and aggregate after heating and self-repair by the repair agent are measured to evaluate the self-repair effect. The influence of the aggregate-asphalt interface interaction on the self-healing property of the asphalt specimen is not considered, and the self-healing property of the aggregate-asphalt adhesion interface is ignored. Therefore, there is an urgent need for an aggregate and asphalt interface self-healing evaluation device. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings in the prior art and to propose a device for evaluating the self-healing property of the interface between aggregate and asphalt.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A device for evaluating the self-healing property of an aggregate-asphalt interface comprises a dynamic shear rheometer, wherein a first clamp is detachably connected to the top of the dynamic shear rheometer, and a second clamp is detachably connected to the bottom of the dynamic shear rheometer;

[0008] The first and second clamps are connected to opposite sides of the first and second clamps respectively. The first component is provided with a first connection base and a first aggregate specimen from top to bottom, and the second component is provided with a second connection base and a second aggregate specimen from bottom to top.

[0009] The first component and the second component have opposite sides that are in contact with an asphalt test piece.

[0010] Compared with the existing technology, the present application can effectively sort the corresponding materials to effectively realize the combination between materials and asphalt, so as to provide materials for self-healing evaluation, ensure that the material quality meets the requirements during the evaluation, and fully guarantee the quality of the data obtained from the evaluation. It can accurately evaluate the differences in the self-healing performance of asphalt interfaces with different lithologic aggregates, optimize the selection of aggregates and asphalt, and improve the overall fatigue resistance and durability of asphalt pavements.

[0011] Preferably, the first connecting base, the first aggregate specimen, the asphalt specimen, the second aggregate specimen and the second connecting base have the same diameter, and the first connecting base, the first aggregate specimen, the asphalt specimen, the second aggregate specimen and the second connecting base are coaxially arranged.

[0012] Furthermore, it is ensured that the quality of material preparation is consistent with the quality of the corresponding pavement materials.

[0013] Preferably, a connecting frame is provided at the top of the dynamic shear rheometer, and grooves are provided at the lower end of the connecting frame and the lower end of the second connecting base. A connecting frame is fixed to the upper end of the first connecting base and the bottom of the dynamic shear rheometer. The connecting frame located at the upper end of the first connecting base extends into the groove at the lower end of the connecting frame, and the connecting frame located at the bottom of the dynamic shear rheometer extends into the groove at the lower end of the second connecting base. The first connecting base bolt-nut connection and the second connecting base bolt-nut connection are respectively installed on the connecting frame and the second connecting base, and connecting bolts are threaded in the first connecting base bolt-nut connection and the second connecting base bolt-nut connection, and the two connecting bolts respectively pass through the corresponding grooves and extend into the corresponding connecting frame.

[0014] Furthermore, it is easy to realize the rapid disassembly and installation of components, which can fully improve the efficiency and quality of material assembly.

[0015] Preferably, the first aggregate specimen and the second aggregate specimen are made of the same material, and the first aggregate specimen and the second aggregate specimen can be made of any one of granite, limestone and basalt.

[0016] Furthermore, the corresponding pavement materials are effectively simulated to improve the test quality of subsequent evaluation simulations.

[0017] Preferably, two epoxy resin layers are provided in the first component and the second component, the two epoxy resin layers located in the first component are respectively arranged between the first aggregate specimen and the first connecting base and the first connecting base and the first clamp, and the two epoxy resin layers located in the second component are respectively arranged between the second connecting base and the second clamp and the second aggregate specimen and the second connecting base.

[0018] Furthermore, the quality of the connection between materials is ensured.

[0019] The beneficial effects of the utility model are:

[0020] 1. The epoxy resin layer can fully ensure the quality of the connection between materials, effectively connect and fuse the materials, effectively simulate the corresponding pavement materials, and improve the test quality of subsequent evaluation simulations;

[0021] 2. At the same time, the components can be detachably connected for quick replacement, making it easy to simulate the effects of various materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram showing the internal structure of the first and second components of a device for evaluating the self-healing properties of the aggregate and asphalt interface proposed in the present invention;

[0023] Figure 2 This is a structural diagram of the first component and the second component of a device for evaluating the self-healing properties of the aggregate and asphalt interface proposed in the present invention;

[0024] Figure 3 This is a diagram showing the internal structure of a dynamic shear rheometer in a device for evaluating the self-healing properties of the aggregate and asphalt interface proposed in the present invention;

[0025] Figure 4 This is a structural diagram of the first connecting base, the second connecting base and the connecting frame in the aggregate and asphalt interface self-healing evaluation device proposed in the utility model;

[0026] Figure 5 This is a diagram showing the connection structure of the connecting frame and connecting bolts in a device for evaluating the self-healing properties of the aggregate and asphalt interface proposed in the present invention;

[0027] Figure 6This is a positional relationship diagram of the connecting jig and the first connecting base in the aggregate and asphalt interface self-healing evaluation device proposed in the utility model;

[0028] Figure 7 This is a structural diagram of a dynamic shear rheometer in a device for evaluating the self-healing properties of the aggregate and asphalt interface proposed in the present invention;

[0029] In the figure: 1 first clamp, 2 second clamp, 3 first component, 4 second component, 5 first connecting base, 6 second connecting base, 7 first aggregate test piece, 8 second aggregate test piece, 9 asphalt test piece, 10 first connecting base bolt and nut connection, 11 second connecting base bolt and nut connection, 12 connecting frame, 13 connecting jig, 14 connecting bolt, 15 dynamic shear rheometer. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Reference Figure 1-7 A device for evaluating the self-healing properties of an aggregate-asphalt interface includes a dynamic shear rheometer 15. A first fixture 1 is detachably connected to the top of the dynamic shear rheometer 15, and a second fixture 2 is detachably connected to the bottom of the dynamic shear rheometer 15, so as to facilitate rapid connection and fixation with corresponding components.

[0032] The first fixture 1 and the second fixture 2 are connected to the first component 3 and the second component 4 on opposite sides, respectively. The first component 3 is provided with a first connection base 5 and a first aggregate specimen 7 from top to bottom, and the second component 4 is provided with a second connection base 6 and a second aggregate specimen 8 from bottom to top.

[0033] The first component 3 and the second component 4 are in contact with an asphalt test piece 9 on one side thereof, so as to facilitate the connection operation with the asphalt and realize the preparation of the asphalt material.

[0034] Reference Figure 1-2 The diameters of the first connecting base 5, the first aggregate specimen 7, the asphalt specimen 9, the second aggregate specimen 8 and the second connecting base 6 are the same, and the first connecting base 5, the first aggregate specimen 7, the asphalt specimen 9, the second aggregate specimen 8 and the second connecting base 6 are coaxially arranged, which can ensure the quality of the connection between the materials.

[0035] Reference Figure 2-7A connecting frame 12 is provided at the top of the dynamic shear rheometer 15, and a groove is provided at the lower end of the connecting frame 12 and the lower end of the second connecting base 6. A connecting frame 13 is fixed to the upper end of the first connecting base 5 and the bottom of the dynamic shear rheometer 15. The connecting frame 13 located at the upper end of the first connecting base 5 extends into the groove at the lower end of the connecting frame 12, and the connecting frame 13 located at the bottom of the dynamic shear rheometer 15 extends into the groove at the lower end of the second connecting base 6. The first connecting base bolt and nut connection 10 and the second connecting base bolt and nut connection 11 are respectively installed on the connecting frame 12 and the second connecting base 6. Connecting bolts 14 are threaded in the first connecting base bolt and nut connection 10 and the second connecting base bolt and nut connection 11. The two connecting bolts 14 respectively pass through the corresponding grooves and extend into the corresponding connecting frame 13, which can be quickly disassembled and assembled according to needs, which is convenient for rapid simulation operations of materials of different materials.

[0036] Reference Figure 1 The first aggregate specimen 7 and the second aggregate specimen 8 are made of the same material. The first aggregate specimen 7 and the second aggregate specimen 8 can be made of any one of granite, limestone and basalt; the range of material selection is expanded to effectively simulate various situations and improve the accuracy of subsequent evaluation.

[0037] Reference Figure 1 Two epoxy resin layers are provided in the first component 3 and the second component 4. The two epoxy resin layers located in the first component 3 are respectively arranged between the first aggregate specimen 7 and the first connecting base 5 and the first connecting base 5 and the first clamp 1. The two epoxy resin layers located in the second component 4 are respectively arranged between the second connecting base 6 and the second clamp 2 and the second aggregate specimen 8 and the second connecting base 6, which can effectively ensure that the materials can be connected.

[0038] In the present invention, an aggregate specimen is prepared, and the aggregate specimen includes a first aggregate specimen 7 and a second aggregate specimen 8 that are completely identical;

[0039] Specifically, when preparing the first and second aggregate specimens 7 and 8, the required aggregate plates are first provided and initially ground using a grinder until the surface is smooth. Next, the aggregate plates are polished using a polishing machine to ensure a mirror finish, eliminating any surface roughness and ensuring accuracy in subsequent tests.

[0040] In some embodiments of the present application, the aggregate plate is prepared using three different lithologic rocks: granite, limestone, and basalt;

[0041] Next, use a cutting machine to cut the polished aggregate plate. When cutting, ensure that the aggregate plate has a uniform thickness and smooth edges. Fix the cut aggregate plate to the coring machine to ensure that it is firmly fixed to prevent deviation during the drilling process. Drill on the aggregate plate. During the drilling process, the vertical angle of the drill bit should be maintained to avoid angular deviation affecting the shape accuracy of the specimen. For example, this application refers to the thickness of the aggregate plate after cutting as 2mm, and the bottom diameter of the cylindrical aggregate specimen is 8mm. The thickness and bottom diameter can be set and adjusted by the operator according to actual needs. This is an example.

[0042] After preparation, the first aggregate specimen 7 and the second aggregate specimen 8 are numbered and stored so as to be distinguished in subsequent experimental operations;

[0043] Install the first aggregate specimen 7 and the second aggregate specimen 8 in the dynamic shear rheometer 15, and perform fine position adjustment in the zero calibration mode so that the center points of the first aggregate specimen 7 and the second aggregate specimen 8 are located on the same center extension line;

[0044] The first connecting base 5 and the second connecting base 6 are fixedly connected to the first clamp 1 and the first clamp 2 of the dynamic shear rheometer 15 respectively;

[0045] The first connecting base 5 and the second connecting base 6 are respectively installed in the first fixture 1 and the first fixture 2 of the dynamic shear rheometer 15, and then the first connecting base 5 and the second connecting base 6 are respectively fixed in the first fixture 1 and the first fixture 2 by fasteners; illustratively, the first connecting base 5 and the second connecting base 6 have exactly the same cylindrical structure, and are adjusted to maintain coaxiality after installation to ensure consistency and accuracy of measurement;

[0046] The first aggregate is fixedly connected to the first connection base 5 by applying epoxy resin to form the first component 3, and the second aggregate is fixedly connected to the second connection base 6 by applying epoxy resin to form the second component 4;

[0047] When the dynamic shear rheometer 15 is in zero calibration mode, the aggregate specimens are installed on the connection base. The specific installation process is to evenly apply an appropriate amount of epoxy resin on the bottom surface of the first aggregate specimen 7, and align and connect it with the first connection base 5 to ensure coaxial alignment, thereby forming the first component 3; similarly, apply epoxy resin on the bottom surface of the second aggregate specimen 8, and align and connect it with the second connection base 6 to ensure coaxial alignment, thereby forming the second component 4. During alignment, the position is fine-tuned by setting the zero gap to ensure that the aggregate specimen and the connection base are concentric and coaxial, thereby ensuring that the aggregate specimen will not produce errors due to eccentricity in subsequent tests;

[0048] In actual operation, it is preferred to use a connection base with the same diameter as the bottom surface of the aggregate specimen, that is, the bottom surface diameters of the first connection base 5 and the second connection base 6 are respectively equal to the bottom surface diameters of the first aggregate specimen 7 and the second aggregate specimen 8. This design can ensure that the base and the specimen are completely aligned, reducing test errors. Furthermore, the bottom surface diameter of the connection base can also be slightly larger than the bottom surface diameter of the aggregate specimen to ensure the stability of the connection.

[0049] The first component 3 and the second component 4 are left to solidify for a time set by the operator;

[0050] The static curing time is set by the operator according to actual needs. In actual implementation, after the epoxy resin is initially hardened, the first component 3 and the second component 4 are removed from the dynamic shear rheometer 15 and placed on a horizontal work surface. They are kept still for 24 hours until the epoxy resin is completely cured. During the curing process, any external force interference is avoided to ensure the integrity and firmness of the epoxy resin connection.

[0051] Adjust the cured first component 3 and the second component 4 to be coaxial and install the first component 3 and the second component 4 into the dynamic shear rheometer 15;

[0052] After the epoxy resin is completely cured, the connected first component 3 and second component 4 are reinstalled into the first fixture 1 and first fixture 2 of the dynamic shear rheometer 15, and the first component 3 and second component 4 are re-adjusted to be coaxial with the first fixture 1 and first fixture 2 respectively to reduce the test error;

[0053] Preheating the first aggregate specimen 7 and the second aggregate specimen 8 to a preset temperature and placing the asphalt sample between the first aggregate specimen 7 and the second aggregate specimen 8, thereby pressing the target film thickness and forming an asphalt mixture with the first aggregate specimen 7 and the second aggregate specimen 8, and leaving it for a first preset time;

[0054] Perform a comprehensive calibration of the dynamic shear rheometer 15, including inertia calibration, motor calibration, and zero calibration, to ensure the accuracy of the instrument during the test and avoid equipment errors affecting the test results;

[0055] After the calibration is completed, the installed first aggregate specimen 7 and second aggregate specimen 8 are heated using the heating device provided with the dynamic shear rheometer 15. The heating temperature is set according to the high temperature grade of the asphalt. In this embodiment, No. 70 base asphalt is used, and the heating temperature is selected to be 45°C to ensure uniform temperature on the aggregate surface.

[0056] A pre-prepared asphalt specimen 9 was placed on the surface of the second aggregate specimen 8. Specifically, No. 70 base asphalt was first placed in an oven and heated at 150°C until it became fluid. The fluidized asphalt was then poured into a silicone mold and cooled to form a cylindrical asphalt specimen 9. To ensure test consistency, the diameters of the upper and lower ends of the asphalt specimen 9 were the same as the bottom diameter of the aggregate specimen.

[0057] After the asphalt test piece 9 is placed on the second aggregate test piece 8, the first aggregate test piece 7 is adjusted to press the asphalt test piece 9 downward, performing preliminary shaping and scraping to the desired film thickness. The first aggregate test piece 7 is then adjusted and further squeezed to achieve the preset target thickness of the asphalt test piece 9; in this embodiment, the target thickness is 2 mm. During this process, the first and second aggregate test pieces 7, 8, and the asphalt test piece 9 are in close contact, forming an asphalt mixture.

[0058] After forming, the asphalt mixture needs to be cooled to the set test temperature. After closing the door of the environmental chamber, the mixture is cured at the test temperature for 15 minutes. The test temperature selected in this example is 25°C, but depending on the test conditions, the temperature can be selected from 25°C, 35°C, 45°C, or 55°C. At medium temperatures (25°C to 45°C), 8mm diameter aggregate specimens are used; at high temperatures (55°C), 25mm diameter aggregate specimens are used instead. In this experiment, 25°C was used as the test temperature to facilitate subsequent dynamic shear rheology testing. Schematic diagram of the formation of the aggregate-asphalt-aggregate interlayer.

[0059] The self-healing performance of the asphalt-aggregate interface of the asphalt mixture was evaluated based on the dynamic shear modulus-load number and dynamic shear modulus-time curves generated by scanning the asphalt mixture using a dynamic shear rheometer 15 and combined with the self-healing index.

[0060] Specifically, before conducting a time sweep test, it is first necessary to perform a stress or strain sweep on the asphalt mixture using a dynamic shear rheometer 15 to determine the appropriate strain and stress application parameters and provide accurate experimental conditions for subsequent time sweep tests, thereby ensuring the reliability and repeatability of the test data.

[0061] After determining the appropriate strain and stress parameters, a time sweep test of the asphalt mixture was performed using the dynamic shear rheometer 15. In this embodiment, the strain was controlled to 6% and the frequency was set to 10 Hz. Under these conditions, a time sweep test of the complex shear modulus G∗ of the asphalt mixture was performed, and a G∗−t curve was recorded and plotted to reflect the trend of the complex shear modulus of different aggregate-asphalt mixtures over time.

[0062] After the test, the self-healing index of the aggregate-asphalt interface was calculated based on the G∗−t curve. The self-healing index can be calculated using the self-healing index formula, specifically reflecting the self-healing performance of the asphalt-aggregate interface for different lithologic aggregates. This example compares the self-healing performance of different aggregates and asphalt to assess the impact of aggregates on the self-healing of the asphalt interface.

[0063] The obtained self-healing index is combined with the damage degree to draw a self-healing index-damage degree curve. Through this curve, the self-healing performance of different aggregate-asphalt interfaces under the same damage state can be intuitively judged. By evaluating three aggregates (limestone, basalt, and granite) with damage degrees of 20%, 40%, and 60% at 25°C, it was found that the self-healing performance of the limestone-asphalt interface was the best, followed by basalt, and granite was relatively poor.

[0064] The self-healing properties of the aggregate-asphalt interface vary under different temperature conditions. At a medium temperature of 25°C, a damage degree of 20%, and an interval time of 60 minutes, the self-healing properties of the limestone-asphalt interface are superior to those of the granite and basalt interfaces. As the temperature increases, the self-healing properties of the basalt and granite interfaces gradually become superior to those of the limestone interface. This is related to the mineral composition and surface roughness of the aggregate. Strong polar minerals such as CaCO3 in limestone improve their adhesion to asphalt through chemical adsorption at medium temperatures, exhibiting better self-healing properties.

[0065] Under high temperature conditions, as hot asphalt flows into the pores and textures on the aggregate surface, the contact area with the aggregate surface increases and the adhesion is enhanced, making the self-healing performance of the basalt and granite interface surpass that of limestone under high temperature conditions. This shows that the mineral composition and surface characteristics of different rock types have a significant impact on the self-healing performance of the aggregate-asphalt interface at different temperatures.

[0066] Therefore, the present application prepared three aggregate specimens of limestone, granite, and basalt, respectively, and constructed a dynamic shear rheological test platform. The dynamic shear rheometer 15 was used to test the self-healing properties of asphalt interfaces of different lithologies. According to the fatigue-interval-fatigue loading mode, the dynamic shear modulus and the number of load actions can be measured at intervals, and the asphalt self-healing index is used for evaluation to determine the influence of the self-healing properties of asphalt under different lithological conditions. The dynamic shear platform constructed by the present invention can not only determine the influence of aggregates of different lithologies on the aggregate-asphalt interface interaction, but also accurately determine the self-healing properties of asphalt under different adhesion conditions and the self-healing properties under different stress states, temperatures, and damage states, thereby obtaining the optimal self-healing temperature under the influence of different lithologies and the best-suited aggregate under different temperature conditions. In addition, the aggregate specimens used in the present application can be applied to the rheological properties of different types of asphalt and aggregate specimens of different lithologies, and can determine the self-healing properties of asphalt mixtures under different damage states, and can screen the optimal asphalt mixtures for different traffic volumes and vehicle load environments.

[0067] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for evaluating the self-healing property of the aggregate and asphalt interface, characterized in that: It comprises a dynamic shear rheometer (15), wherein the top of the dynamic shear rheometer (15) is detachably connected to a first clamp (1), and the bottom of the dynamic shear rheometer (15) is detachably connected to a second clamp (2); A first component (3) and a second component (4) are connected to opposite sides of the first fixture (1) and the second fixture (2), respectively; a first connection base (5) and a first aggregate specimen (7) are provided in the first component (3) from top to bottom; and a second connection base (6) and a second aggregate specimen (8) are provided in the second component (4) from bottom to top; The first component (3) and the second component (4) have opposite sides that are in contact with an asphalt test piece (9).

2. The device for evaluating the self-healing properties of the aggregate-asphalt interface according to claim 1, characterized in that: The first connecting base (5), the first aggregate test piece (7), the asphalt test piece (9), the second aggregate test piece (8) and the second connecting base (6) have the same diameter, and the first connecting base (5), the first aggregate test piece (7), the asphalt test piece (9), the second aggregate test piece (8) and the second connecting base (6) are coaxially arranged.

3. The device for evaluating the self-healing property of the aggregate-asphalt interface according to claim 1, characterized in that: A connecting frame (12) is provided at the top of the dynamic shear rheometer (15), and a groove is provided at the lower end of the connecting frame (12) and the lower end of the second connecting base (6). A connecting frame (13) is fixed to the upper end of the first connecting base (5) and the bottom of the dynamic shear rheometer (15). The connecting frame (13) located at the upper end of the first connecting base (5) extends into the groove at the lower end of the connecting frame (12), and the connecting frame (13) located at the bottom of the dynamic shear rheometer (15) extends into the groove at the lower end of the second connecting base (6). A first connecting base bolt-nut connection (10) and a second connecting base bolt-nut connection (11) are respectively installed on the connecting frame (12) and the second connecting base (6). Connecting bolts (14) are screwed into the first connecting base bolt-nut connection (10) and the second connecting base bolt-nut connection (11). The two connecting bolts (14) respectively pass through the corresponding grooves and extend into the corresponding connecting frame (13).

4. The device for evaluating the self-healing properties of the aggregate-asphalt interface according to claim 1, characterized in that: The first aggregate specimen (7) and the second aggregate specimen (8) are made of the same material, and the first aggregate specimen (7) and the second aggregate specimen (8) are made of any one of granite, limestone and basalt.

5. The device for evaluating the self-healing property of the aggregate-asphalt interface according to claim 1, characterized in that: Two epoxy resin layers are provided in each of the first component (3) and the second component (4). The two epoxy resin layers in the first component (3) are respectively arranged between the first aggregate specimen (7) and the first connection base (5) and between the first connection base (5) and the first fixture (1). The two epoxy resin layers in the second component (4) are respectively arranged between the second connection base (6) and the second fixture (2) and between the second aggregate specimen (8) and the second connection base (6).

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