Clamp for fracture healing of semicircular bending test piece of asphalt mixture

Abstract

The utility model discloses a clamp for fracture healing of an asphalt mixture semicircular bending test piece, which relates to the technical field of road engineering material testing equipment and comprises a clamping plate assembly and a measuring assembly. The clamping plate assembly comprises a front clamping plate, a rear clamping plate, a first side clamping plate and a second side clamping plate, one side of each of the first side clamping plate and the second side clamping plate is provided with an arc-shaped binding surface; the measuring assembly comprises a numerical value display, a first force measuring sheet and at least one second force measuring sheet; the first force measuring sheet is arranged on one side, attached to the front clamping plate or the rear clamping plate, of the semicircular bending test piece; each second force measuring sheet is used for being arranged on one side, attached to the arc-shaped attaching surface of the first side clamping plate and / or the second side clamping plate, of the semicircular bending test piece; the numerical value display is in communication connection with the first force measuring sheet and the second force measuring sheets. Fixing and clamping can be more accurate, adjustment is convenient, the fracture face of the fractured semicircular bending test piece can make close contact, and the self-healing effect is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of road engineering material testing equipment, and in particular to a clamp for fracture healing of asphalt mixture semi-circular bend specimens. Background Technology

[0002] Currently, semi-circular bend specimens are widely used in asphalt mixture performance research due to their advantages such as high material utilization, reasonable stress distribution, accurate assessment of crack resistance, good repeatability, and wide applicability. The self-healing performance of asphalt mixtures is a crucial factor affecting the service life of asphalt pavements. After cracking, the fracture surfaces of the asphalt mixture approach and come into contact, promoting the infiltration and diffusion of asphalt molecules on the fracture surface, which is one of the necessary conditions for the asphalt mixture to exhibit self-healing behavior.

[0003] In the study of the self-healing performance of asphalt mixtures, external constraints must be used to ensure that the fracture surfaces of the fractured specimens re-contact. Currently, for fracture healing tests on semi-circular bend specimens, most clamps suffer from problems such as unstable fixing and inconvenient adjustment, making it difficult to achieve close contact between the fracture surfaces, affecting the self-healing effect, and hindering the widespread application of semi-circular bend specimens in the study of the self-healing performance of asphalt mixtures. Utility Model Content

[0004] The purpose of this invention is to provide a clamp for fracture healing of asphalt mixture semi-circular bend specimens, in order to solve the problems existing in the prior art. It can fix and clamp more accurately and adjust more conveniently, and can make the fracture surfaces of the fractured semi-circular bend specimens in close contact, thereby improving the self-healing effect.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] This utility model provides a clamp for fracture healing of asphalt mixture semi-circular bend specimens, including a clamping plate assembly and a measuring assembly; the front-to-back direction of the semi-circular bend specimen is taken as the first direction, and the left-to-right direction of the semi-circular bend specimen is taken as the second direction; the clamping plate assembly includes a front clamping plate, a rear clamping plate, a first side clamping plate, and a second side clamping plate; the front clamping plate and the rear clamping plate are arranged parallel to each other in the first direction, and a first threaded rod is passed through each end of the front clamping plate and the corresponding end of the rear clamping plate, and a first nut is threaded at each end of the first threaded rod; the first side clamping plate and the second side clamping plate are arranged parallel to each other in the second direction, and at least one second threaded rod is passed through the corresponding end of the first side clamping plate and the second side clamping plate, and the second threaded rod... Each end of the device is threaded with a second nut; both the first and second side clamps have an arc-shaped contact surface on the side near the semi-circular bend specimen for contacting the side of the semi-circular bend specimen, and the width of the arc-shaped contact surface in the second direction is less than the width of the semi-circular bend specimen in the second direction; the measuring assembly includes a numerical display, a first force measuring plate, and at least one second force measuring plate; the first force measuring plate is used to be disposed on the side of the semi-circular bend specimen that contacts the front clamp or the rear clamp; each of the second force measuring plates is used to be disposed on the side of the semi-circular bend specimen that contacts the arc-shaped contact surface of the first side clamp and / or the second side clamp; the numerical display is communicatively connected to the first force measuring plate and each of the second force measuring plates.

[0007] Preferably, a second force-measuring sheet is provided between the arc-shaped contact surface of the first side clamp and the semi-circular curved specimen, and between the arc-shaped contact surface of the second side clamp and the semi-circular curved specimen.

[0008] Preferably, the front clamp and the rear clamp have the same structure; the first side clamp and the second side clamp have a symmetrical structure; the front clamp has a protrusion fixedly provided at the middle of both ends in the second direction; the first side clamp has a clearance groove at both ends in the first direction; the protrusion at one end of the front clamp is located in the clearance groove of the first side clamp, and the protrusion at the other end of the front clamp is located in the clearance groove of the second side clamp; a first through hole is provided on the protrusion of the front clamp, and the first threaded rod is inserted through the first through hole; the first side clamp has a second through hole on both sides of the clearance groove at its end, and the second threaded rod is inserted through the second through hole.

[0009] Preferably, a first support plate is fixedly provided at the bottom of the first side clamping plate, and a second support plate is fixedly provided at the bottom of the second side clamping plate; both the first support plate and the second support plate are located below the semi-circular curved specimen.

[0010] Preferably, the front clamping plate, the rear clamping plate, and each of the arc-shaped bonding surfaces are provided with anti-slip textures or have an anti-slip layer pasted on at the bonding positions with the semi-circular curved specimen.

[0011] Preferably, the anti-slip layer used to adhere the front clamp, the rear clamp, and each of the arc-shaped bonding surfaces to the bonding position with the semi-circular curved specimen is a rubber pad.

[0012] Preferably, the first force-measuring sheet and each of the second force-measuring sheets are force sensors of the same type.

[0013] Preferably, the first force-measuring sheet is a flexible thin-film pressure sensor.

[0014] Preferably, an arc-shaped retainer is fixedly provided on the side of the first side clamping plate near the semi-circular bend specimen, and the arc-shaped retainer is provided on the side of the semi-circular bend specimen near the arc-shaped retainer; at least one through hole is provided on the first side clamping plate, and at least one internal threaded hole is provided on the arc-shaped retainer, and the threaded end of a connecting bolt passes through one of the through holes and is threadedly connected to one of the internal threaded holes on the arc-shaped retainer.

[0015] Preferably, the first side clamp is provided with a plurality of through holes along the vertical direction.

[0016] The present invention achieves the following technical advantages over the prior art:

[0017] This utility model provides a clamp for fracture healing of asphalt mixture semi-circular bend specimens. The clamping plate assembly design effectively fixes the semi-circular bend specimen: in the first direction, the front and rear clamping plates clamp the specimen through the cooperation of the first threaded rod and the first nut. This parallel and relative arrangement ensures uniform pressure is applied to the specimen in the front-rear direction, making the specimen stable and fixed in this direction; in the second direction, the first and second side clamping plates are clamped by the second threaded rod and the second nut; the numerical display is communicatively connected to the first force measuring plate and each of the second force measuring plates, which allows the operator to easily read the force values ​​of the specimen in different directions, accurately... Accurate monitoring of the stress on the specimen in all directions during the healing process provides precise data support for studying the fracture healing characteristics of asphalt mixture semi-circular bend specimens, ensuring close contact between the fracture surfaces of the fractured semi-circular bend specimens for better self-healing. This precise clamping mechanism ensures that the fracture surfaces are fully aligned with uniform pressure distribution, effectively promoting the wetting and diffusion of asphalt molecules in the asphalt mixture. Fine adjustment is achieved through the interaction of the first threaded rod with the first nuts at both ends and the second threaded rod with the second nuts at both ends, along with the setting of the measuring components, ensuring balanced force application, reducing human error, and enhancing the controllability of the test process and the accuracy of the data.

[0018] Furthermore, by setting force measuring plates on both sides, the force on both sides can be measured separately, and this dual-sided measurement can better take into account the unevenness of the force on the specimen in the left and right directions.

[0019] Furthermore, the front and rear clamps have identical structures, and the first and second side clamps are symmetrical. This symmetrical design makes the overall force distribution of the clamp more uniform. When fixing the semi-circular curved specimen, each clamp can evenly distribute the pressure, avoiding local stress concentration caused by structural asymmetry, which would affect the fixing effect of the specimen. The symmetrical structure of the clamps also makes the installation process more intuitive. Whether it is the installation of the front and rear clamps or the installation of the first and second side clamps, the operation method is basically the same, reducing installation errors caused by structural complexity or asymmetry and improving installation efficiency. The protrusion set in the middle of the end of the front clamp cooperates with the clearance groove at the end of the first and second side clamps, thereby achieving a uniform clamping and fixing effect of the front, rear, first, and second side clamps.

[0020] Furthermore, the first support plate and the second support plate are respectively fixed to the bottom of the first side clamp and the second side clamp, and are located below the semi-circular bend specimen. They can provide additional support for the semi-circular bend specimen. During the fracture healing test of the specimen, especially when the specimen is subjected to vertical force or its own weight, the support plate can effectively prevent the specimen from sinking or displacing in the vertical direction.

[0021] Furthermore, the added anti-slip texture or adhesive anti-slip layer can greatly enhance the clamping effect on the semi-circular bend specimen, preventing the semi-circular bend specimen from sliding or falling off during the test.

[0022] Furthermore, the rubber pad has good fit and provides good friction, and as an anti-slip layer, it can play a role in cushioning and shock absorption.

[0023] Furthermore, using the same type of force sensor can reduce costs and facilitate management.

[0024] Furthermore, the flexible thin-film pressure sensor can fit this curved surface very well. Because of its good flexibility, it can bend with the curvature of the specimen surface, ensuring a tight and uniform contact with the specimen.

[0025] Furthermore, the arc-shaped retainer is connected to the first side clamping plate by connecting bolts, which allows the arc-shaped retainer located on the arc-shaped mating surface to be easily disassembled and installed.

[0026] Furthermore, multiple through holes are provided along the vertical direction on the first side clamp, which can flexibly adjust the height of the arc-shaped fixture. This allows the arc-shaped mating surface to better fit with the side of the semi-circular curved specimen, ensuring that a uniform and appropriate clamping force can be applied to the side of the specimen, effectively fixing the specimen. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the clamp for fracture healing of asphalt mixture semi-circular bend specimens provided by this utility model.

[0029] Figure 2 for Figure 1 Top view;

[0030] Figure 3 for Figure 1 The main view;

[0031] Figure 4 for Figure 1 Side view;

[0032] Figure 5 A schematic diagram showing the positions of the first and second force-measuring plates on the semi-circular bending specimen in the fixture for fracture healing of asphalt mixture semi-circular bending specimens provided by this utility model.

[0033] Figure 6 A schematic diagram of the fit between the clamp for fracture healing of asphalt mixture semi-circular bend specimens and the semi-circular bend specimens provided by this utility model.

[0034] Figure 7 A schematic diagram of the structure of the first screw and the first nut or the second screw and the second nut in the fixture for fracture healing of asphalt mixture semi-circular bend specimens provided by this utility model;

[0035] Figure 8 This is a schematic diagram of the connection structure between the arc-shaped retainer and the first side clamp or the second side clamp in the clamp for fracture healing of asphalt mixture semi-circular bending specimens provided by this utility model.

[0036] In the picture:

[0037] 10-Front plate; 11-Protrusion;

[0038] 20-Rear clamp;

[0039] 30-First side clamping plate; 31-Allowing groove; 32-First support plate; 33-Through hole;

[0040] 40 - Second side clamp; 41 - Second support plate;

[0041] 50 - Arc-shaped retainer; 51 - Arc-shaped mating surface; 52 - Connecting bolt;

[0042] 60 - First threaded rod; 61 - First nut;

[0043] 70 - Second threaded rod; 71 - Second nut;

[0044] 80-Semicircular bend specimen;

[0045] 90 - First force measuring plate; 91 - Second force measuring plate; 93 - Numerical display. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] The purpose of this invention is to provide a clamp for fracture healing of asphalt mixture semi-circular bend specimens, in order to solve the problems existing in the prior art. It can fix and clamp more accurately and is easy to adjust, and can make the fracture surfaces of the fractured semi-circular bend specimens in close contact, thereby improving the self-healing effect.

[0048] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Example 1

[0050] This embodiment provides a fixture for fracture healing of asphalt mixture semi-circular bend specimens, such as... Figures 1 to 8As shown, the device includes a clamping assembly and a measuring assembly; the front-to-back direction of the semi-circular bend specimen 80 is taken as the first direction, and the left-to-right direction of the semi-circular bend specimen 80 is taken as the second direction; the clamping assembly includes a front clamping plate 10, a rear clamping plate 20, a first side clamping plate 30, and a second side clamping plate 40; the front clamping plate 10 and the rear clamping plate 20 are arranged parallel to each other in the first direction, and a first threaded rod 60 is threaded through both ends of the front clamping plate 10 and the corresponding ends of the rear clamping plate 20, and a first nut 61 is threaded through both ends of the first threaded rod 60; the first side clamping plate 30 and the second side clamping plate 40 are arranged parallel to each other in the second direction, and at least one second threaded rod 70 is threaded through the corresponding ends of the first side clamping plate 30 and the second side clamping plate 40, and a second nut 61 is threaded through both ends of the second threaded rod 70. Nut 71; the first side clamp 30 and the second side clamp 40 both have an arc-shaped contact surface 51 on the side near the semi-circular bend specimen 80 for contacting the side of the semi-circular bend specimen 80, and the width of the arc-shaped contact surface 51 in the second direction is less than the width of the semi-circular bend specimen 80 in the second direction; the measuring assembly includes a numerical display 93, a first force measuring plate 90 and at least one second force measuring plate 91; the first force measuring plate 90 is used to be disposed on the side of the semi-circular bend specimen 80 that is in contact with the front clamp 10 or the rear clamp 20; each of the second force measuring plates 91 is used to be disposed on the side of the semi-circular bend specimen 80 that is in contact with the arc-shaped contact surface 51 of the first side clamp 30 and / or the second side clamp 40; the numerical display 93 is communicatively connected to the first force measuring plate 90 and each of the second force measuring plates 91.

[0051] The clamping assembly is designed to effectively fix the semi-circular bend specimen 80: In the first direction, the front clamping plate 10 and the rear clamping plate 20 clamp the specimen through the cooperation of the first threaded rod 60 and the first nut 61. This parallel and relative arrangement ensures that uniform pressure is applied to the specimen in the front-rear direction, making the specimen stable and fixed in this direction; in the second direction, the first side clamping plate 30 and the second side clamping plate 40 are clamped by the second threaded rod 70 and the second nut 71; the numerical display 93 is communicatively connected to the first force measuring plate 90 and each of the second force measuring plates 91, which allows the operator to easily read the force values ​​of the specimen in different directions and accurately monitor the specimen's bending motion. The stress conditions in various directions during the clamping process provide accurate data support for studying the fracture healing characteristics of the asphalt mixture semi-circular bend specimen 80, ensuring close contact between the fracture surfaces of the fractured semi-circular bend specimen 80 for better self-healing. This precise clamping mechanism ensures that the fracture surfaces are fully aligned with uniform pressure distribution, effectively promoting the wetting and diffusion of asphalt molecules in the asphalt mixture. Through the interaction of the first threaded rod 60 with the first nuts 61 at both ends and the second threaded rod 70 with the second nuts 71 at both ends, along with the setting of the measuring components, fine adjustment is achieved, ensuring the balance of applied force, reducing human error, and enhancing the controllability of the test process and the accuracy of the data.

[0052] The following are the settings instructions for the clamping plate assembly:

[0053] Among the optional solutions in this embodiment, the more preferred one is as follows: Figures 1-4 As shown, the front clamping plate 10 and the rear clamping plate 20 have the same structure; the first side clamping plate 30 and the second side clamping plate 40 have a symmetrical structure; the front clamping plate 10 has a protrusion 11 fixedly provided at the middle of both ends in the second direction; the first side clamping plate 30 has a relief groove 31 at both ends in the first direction; the protrusion 11 at one end of the front clamping plate 10 is located in the relief groove 31 of the first side clamping plate 30, and the protrusion 11 at the other end of the front clamping plate 10 is located in the relief groove 31 of the second side clamping plate 40; a first through hole is provided on the protrusion 11 of the front clamping plate 10, and a first threaded rod 60 is inserted in the first through hole; a second through hole is provided on both sides of the relief groove 31 at the end of the first side clamping plate 30, and a second threaded rod 70 is inserted in the second through hole. The front clamping plate 10 and the rear clamping plate 20 have the same structure. The first side clamping plate 30 and the second side clamping plate 40 have a symmetrical structure. This symmetrical design makes the overall force of the clamp more uniform. When fixing the semi-circular curved specimen 80, each clamping plate can evenly distribute the pressure, avoiding the local stress concentration caused by structural asymmetry, which would affect the fixing effect of the specimen. The symmetrical structure of the clamping plates also makes the installation process more intuitive. Whether it is the installation of the front clamping plate 10 and the rear clamping plate 20, or the installation of the first side clamping plate 30 and the second side clamping plate 40, the operation method is basically the same, reducing installation errors caused by structural complexity or asymmetry and improving installation efficiency. The protrusion 11 set in the middle of the end of the front clamping plate 10 cooperates with the clearance groove 31 at the end of the first side clamping plate 30 and the second side clamping plate 40, thereby achieving a uniform clamping and fixing effect of the front clamping plate 10, the rear clamping plate 20, the first side clamping plate 30 and the second side clamping plate 40.

[0054] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 , Figure 2 , Figure 6 and Figure 8 As shown, an arc-shaped retainer 50 is fixedly installed on the side of the first side clamping plate 30 near the semi-circular curved specimen 80, and an arc-shaped contact surface 51 is provided on the side of the arc-shaped retainer 50 near the semi-circular curved specimen 80. At least one through hole 33 is provided on the first side clamping plate 30, and at least one internally threaded hole is provided on the arc-shaped retainer 50. The threaded end of a connecting bolt 52 passes through one of the through holes 33 and is threadedly connected to one of the internally threaded holes on the arc-shaped retainer 50. The arc-shaped retainer 50 is connected to the first side clamping plate 30 by the connecting bolt 52, which allows for easy disassembly and installation of the arc-shaped retainer 50 where the arc-shaped contact surface 51 is located.

[0055] Specifically, the structure of the arc-shaped retainer 50 can be as follows: Figure 8 As shown.

[0056] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 8 As shown, the first side clamping plate 30 has multiple through holes 33 along the vertical direction. The arc-shaped retainer 50 is connected to the first side clamping plate 30 by connecting bolts 52, which allows the arc-shaped retainer 50, where the arc-shaped mating surface 51 is located, to be easily disassembled and installed.

[0057] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 , Figure 3 , Figure 4 , Figure 6 and Figure 8 As shown, a first support plate 32 is fixedly installed at the bottom of the first side clamping plate 30, and a second support plate 41 is fixedly installed at the bottom of the second side clamping plate 40; both the first support plate 32 and the second support plate 41 are located below the semi-circular bend specimen 80. The first support plate 32 and the second support plate 41 are respectively fixed to the bottom of the first side clamping plate 30 and the second side clamping plate 40, and are located below the semi-circular bend specimen 80. They can provide additional support for the semi-circular bend specimen 80. During the fracture healing test of the specimen, especially when the specimen is subjected to vertical force or its own weight, the support plate can effectively prevent the specimen from sinking or displacing in the vertical direction.

[0058] In the optional embodiments of this example, a preferred embodiment is that the front clamping plate 10, the rear clamping plate 20, and each arc-shaped contact surface 51 are provided with anti-slip textures or have an anti-slip layer pasted on at the contact points with the semi-circular curved specimen 80. The provided anti-slip textures or pasted anti-slip layers can greatly enhance the fixing effect of the clamps on the semi-circular curved specimen 80, preventing the semi-circular curved specimen 80 from sliding or falling off during the test.

[0059] In the optional embodiments of this example, a preferred method is to use rubber pads as the anti-slip layer for the front clamping plate 10, the rear clamping plate 20, and each arc-shaped bonding surface 51 at the bonding position with the semi-circular curved specimen 80. Rubber pads offer good adhesion and provide good friction, and as an anti-slip layer, they can also provide cushioning and shock absorption.

[0060] The following are the settings instructions for the measurement components:

[0061] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 5 As shown, a second force-measuring plate 91 is provided between the arc-shaped mating surface 51 of the first side clamping plate 30 and the semi-circular curved specimen 80, and between the arc-shaped mating surface 51 of the second side clamping plate 40 and the semi-circular curved specimen 80. By providing force-measuring plates on both sides, the force conditions on both sides can be measured separately, and this dual-sided measurement can better take into account the unevenness of the force on the specimen in the left and right directions.

[0062] In the optional solutions of this embodiment, it is more preferred that the first force-measuring sheet 90 and each of the second force-measuring sheets 91 are force sensors of the same type. Using the same type of force sensor can reduce costs and facilitate management.

[0063] In the optional embodiments of this example, a preferred option is that the first force-measuring sheet 90 is a flexible thin-film pressure sensor. The flexible thin-film pressure sensor can conform well to this curved surface. Because of its good flexibility, it can bend with the curvature of the specimen surface, ensuring close and uniform contact with the specimen.

[0064] Specifically, the specimen mentioned above refers to the semi-circular bend specimen 80.

[0065] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A fixture for fracture healing of asphalt mixture semi-circular bend specimens, characterized in that: Includes clamping plate assembly and measuring assembly; The front-to-back direction of the semicircular bend specimen is taken as the first direction, and the left-to-right direction of the semicircular bend specimen is taken as the second direction. The clamping assembly includes a front clamping plate, a rear clamping plate, a first side clamping plate, and a second side clamping plate. The front clamping plate and the rear clamping plate are arranged parallel to each other in the first direction, and a first threaded rod is threaded through both ends of the front clamping plate and the corresponding end of the rear clamping plate. A first nut is threaded through both ends of the first threaded rod. The first side clamping plate and the second side clamping plate are arranged parallel to each other in the second direction, and at least one second threaded rod is threaded through the corresponding end of the first side clamping plate and the second side clamping plate. A second nut is threaded through both ends of the second threaded rod. The side of the first side clamping plate and the second side clamping plate near the semi-circular bending specimen has an arc-shaped contact surface for contacting the side of the semi-circular bending specimen, and the width of the arc-shaped contact surface in the second direction is smaller than the width of the semi-circular bending specimen in the second direction. The measuring assembly includes a numerical display, a first force measuring plate, and at least one second force measuring plate; the first force measuring plate is disposed on the side of the semi-circular bending specimen that is in contact with the front clamp or the rear clamp; each of the second force measuring plates is disposed on the side of the semi-circular bending specimen that is in contact with the arcuate contact surface of the first side clamp and / or the second side clamp; the numerical display is communicatively connected to the first force measuring plate and each of the second force measuring plates.

2. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 1, characterized in that: A second force-measuring sheet is provided between the arc-shaped contact surface of the first side clamp and the semi-circular bending specimen, and between the arc-shaped contact surface of the second side clamp and the semi-circular bending specimen.

3. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 1, characterized in that: The front clamp and the rear clamp have the same structure; the first side clamp and the second side clamp have a symmetrical structure. The front clamping plate has protrusions fixedly provided at the middle of both ends in the second direction; the first side clamping plate has clearance grooves at both ends in the first direction; the protrusion at one end of the front clamping plate is located in the clearance groove of the first side clamping plate, and the protrusion at the other end of the front clamping plate is located in the clearance groove of the second side clamping plate. The front clamp plate has a first through hole on the protrusion, and the first threaded rod is inserted through the first through hole; The first side clamping plate has a second through hole on both sides of the clearance groove, and the second through hole is used to insert the second threaded rod.

4. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 1, characterized in that: A first support plate is fixedly provided at the bottom of the first side clamp, and a second support plate is fixedly provided at the bottom of the second side clamp; Both the first support plate and the second support plate are located below the semi-circular bend specimen.

5. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 1, characterized in that: The front clamping plate, the rear clamping plate, and each of the arc-shaped bonding surfaces are provided with anti-slip textures or have anti-slip layers pasted on at the bonding positions with the semi-circular curved specimen.

6. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 5, characterized in that: The anti-slip layer of the front clamping plate, the rear clamping plate, and each of the arc-shaped bonding surfaces used to adhere to the bonding position of the semi-circular curved specimen is a rubber pad.

7. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 1, characterized in that: The first force-measuring sheet and each of the second force-measuring sheets are force sensors of the same type.

8. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 7, characterized in that: The first force-measuring sheet is a flexible thin-film pressure sensor.

9. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 3, characterized in that: An arc-shaped fastener is fixedly installed on the side of the first side clamping plate near the semi-circular curved specimen, and the arc-shaped fitting surface is provided on the side of the arc-shaped fastener near the semi-circular curved specimen. The first side clamp has at least one through hole, and the arc-shaped retainer has at least one internal threaded hole. The threaded end of a connecting bolt passes through one of the through holes and is threadedly connected to one of the internal threaded holes on the arc-shaped retainer.

10. The fixture for fracture healing of asphalt mixture semi-circular bend specimens according to claim 9, characterized in that: The first side clamp has a plurality of through holes arranged in the vertical direction.

Images