Shearing die and testing machine for testing asphalt-aggregate sandwich test piece

Abstract

The utility model discloses a shear mould for asphalt-aggregate'sandwich 'test piece test, the asphalt-aggregate'sandwich' test piece is of a structure that one layer of asphalt is sandwiched between two layers of aggregate, the shear mould comprises a fixed mould and a movable mould, the movable mould is provided with a first accommodating groove and two first threaded holes, and the fixed mould is provided with a second accommodating groove; each first threaded hole is communicated with the first accommodating groove, and a first bolt is mounted at each first threaded hole; a second containing groove is formed in the fixed mold, two second threaded holes are formed in the fixed mold, the two second threaded holes are coaxially formed, each second threaded hole is communicated with the second containing groove, and a second bolt is installed at each second threaded hole; and a gap is formed between the movable mold and the fixed mold. The shearing mold disclosed by the utility model can be used for fixing the asphalt-aggregate sandwich test piece and shearing the asphalt-aggregate sandwich test piece, so that the asphalt-aggregate sandwich test piece can be conveniently subjected to a shearing test.

Description

Technical Field

[0001] The utility model belongs to the field of parameter testing machines, and more specifically, relates to a shear die and a testing machine for testing asphalt-aggregate "sandwich" specimens. Background Art

[0002] With the rapid development of China's transportation industry, asphalt pavements are widely used in China's high-grade highways. However, the pavements designed according to the elastic layered theory system have problems of insufficient interlayer shear strength and waterproofing. At present, China's construction specifications for asphalt pavements have relatively few regulations on interlayer construction of asphalt pavements. For actual projects, there is no systematic test method and evaluation standard for the selection of interlayer tack coat materials and dosages of asphalt pavements, and most rely on experience. And good pavement shear strength can extend the service life of the pavement and save maintenance costs. Therefore, it is of great significance to study the interlayer shear of the pavement.

[0003] The shear test is one of the important methods for evaluating the adhesion performance between asphalt and aggregates. This test quantifies the adhesion strength at the interface between asphalt and aggregates by simulating the stress condition of the asphalt pavement under shear force during actual use, so as to evaluate the adhesion level between asphalt and aggregates. Due to the lack of a unified shear strength test method and evaluation index, most shear test devices are independently designed, and there are deficiencies in the standardization of operation methods for shear tests, lacking a unified implementation procedure.

[0004] In some current shear test devices, when in use, it is not convenient to install asphalt-aggregate specimens. Moreover, due to the manufacturing errors of asphalt-aggregate specimens, the shear die cannot firmly fix the asphalt-aggregate specimens, and the asphalt-aggregate specimens are prone to shaking or slipping, thus affecting the accuracy of test results. Content of the Utility Model

[0005] Aiming at the above defects or improvement requirements of the prior art, the utility model provides a shear die and a testing machine for testing asphalt-aggregate "sandwich" specimens. The shear die can fix the asphalt-aggregate "sandwich" specimens, facilitating the shearing of asphalt-aggregate "sandwich" specimens. The testing machine can meet the data requirements for shear tests while simplifying the operation process, thus effectively solving the problems of cumbersome operation and inaccurate data in the current technology. Through this testing machine, it can ensure the efficient and accurate execution of the shear test between asphalt and aggregates. At the same time, its structural design is reasonable and the operation is convenient, greatly improving the practicability and convenience of the test.

[0006] To achieve the above object, according to one aspect of the present utility model, there is provided a shear die for testing asphalt-aggregate "sandwich" specimens. The asphalt-aggregate "sandwich" specimen has a structure of two layers of aggregates sandwiching one layer of asphalt. The shear die is characterized in that it includes a fixed die and a moving die that can move relative to the fixed die to shear the asphalt-aggregate "sandwich" specimen, wherein:

[0007] A first receiving groove is provided on the moving die for receiving one layer of the aggregates. And at a position corresponding to the first receiving groove on the moving die, two first threaded holes are provided. These two first threaded holes are coaxially arranged. Each first threaded hole communicates with the first receiving groove respectively, and a first bolt is installed at each first threaded hole so that the two first bolts cooperate to clamp the aggregates in the first receiving groove;

[0008] At a position corresponding to the first receiving groove on the fixed die, a second receiving groove is provided for receiving the other layer of aggregates. And at a position corresponding to the second receiving groove on the fixed die, two second threaded holes are provided. These two second threaded holes are coaxially arranged. Each second threaded hole communicates with the second receiving groove respectively, and a second bolt is installed at each second threaded hole so that the two second bolts cooperate to clamp the aggregates in the second receiving groove;

[0009] A gap exists between the moving die and the fixed die to place the asphalt at this gap.

[0010] Preferably, the moving die is integrally in a Z shape, and a first shear plane is provided on the moving die.

[0011] Preferably, the fixed die is integrally in an L shape. At a position corresponding to the moving die on the fixed die, a second shear plane parallel to the first shear plane is provided, and the gap is formed between the second shear plane and the first shear plane.

[0012] Preferably, a first positioning surface is provided on the moving die, and a second positioning surface is provided on the fixed die. The first positioning surface fits with the second positioning surface to facilitate the alignment of the first receiving groove and the second receiving groove.

[0013] Preferably, a plurality of connection holes are provided on the moving die to facilitate the connection of a moving shaft driven by a power mechanism.

[0014] Preferably, a plurality of connection holes are provided on the fixed die to facilitate the connection of a stationary shaft.

[0015] Preferably, both the moving die and the fixed die are made of steel.

[0016] Preferably, both the first receiving groove and the second receiving groove are square grooves.

[0017] According to another aspect of the present utility model, there is also provided a testing machine for testing asphalt-aggregate "sandwich" specimens, including the shear die described above, characterized in that it further includes a controller, a temperature chamber, a moving shaft, a stationary shaft, and a power mechanism, wherein:

[0018] The controller is connected to the temperature chamber;

[0019] The shear die is located inside the temperature chamber;

[0020] The stationary shaft is fixedly installed on the temperature chamber, and the fixed die of the shear die is fixedly installed on the stationary shaft;

[0021] The power mechanism is installed on the temperature chamber, and the power mechanism is connected to the moving shaft for driving the moving shaft to move, and the moving die of the shear die is installed on the moving shaft.

[0022] Preferably, a temperature control sensor module is provided inside the temperature chamber, and the temperature control sensor module is connected to the controller.

[0023] Generally speaking, compared with the prior art by the above technical solutions conceived by the present utility model, the following beneficial effects can be achieved:

[0024] 1) The present utility model provides a shear die for testing asphalt-aggregate "sandwich" specimens. The shear die is reasonably designed, can realize the efficient and stable installation of asphalt-aggregate "sandwich" specimens, and is convenient for the moving die to move to shear the asphalt-aggregate "sandwich" specimens. The shear die uses a physical reinforcement method of bolt fixation for the asphalt-aggregate "sandwich" specimens to ensure the stability of the asphalt-aggregate "sandwich" specimens during the test. This design not only simplifies the installation process, but also greatly shortens the installation time, improves the test efficiency, and this set of shear die can be reused for a long time without frequent replacement or maintenance. This set of shear die can complete shear tests under different temperature environments.

[0025] 2) The testing machine of the present utility model has no high requirements for operators, and the preparation work before the test is simple. When using this testing machine, only the aggregate part of the asphalt-aggregate "sandwich" specimen needs to be made into a specified size and shape and installed on the shear die of the testing machine. The testing process is highly standardized and has high repeatability, providing scientific and reliable adhesion test results for users, significantly improving the scientificity and accuracy of the testing process, and making the shear performance test (adhesion test) more efficient and credible. Description of the Drawings

[0026] Figure 1 is a three-dimensional schematic diagram of the shear die of the present utility model with an asphalt-aggregate "sandwich" specimen installed thereon;

[0027] Figure 2 is a top view of the shear die of the present utility model with an asphalt-aggregate "sandwich" specimen installed thereon;

[0028] Figure 3 is a front view of the shear die of the present utility model with an asphalt-aggregate "sandwich" specimen installed thereon;

[0029] Figure 4 is an overall schematic diagram of the testing machine in the present utility model;

[0030] Figure 5 is a partial schematic diagram of the testing machine in the present utility model. Specific embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] Refer to Figures 1 to 3 , a shear die for testing an asphalt-aggregate "sandwich" specimen, wherein the asphalt-aggregate "sandwich" specimen 7 has a structure of two layers of aggregates sandwiching one layer of asphalt, that is, one layer of asphalt adheres to two layers of aggregates. The shear die 16 includes a fixed die 2 and a movable die 1 that can move relative to the fixed die 2 to shear the asphalt-aggregate "sandwich" specimen 7. By moving the movable die 1, the shearing of the asphalt-aggregate "sandwich" specimen 7 is achieved. The interface between the asphalt and the aggregates is parallel to the moving direction of the movable die 1, so that the interlayer adhesion performance between the asphalt and the aggregates can be obtained. Refer to Figure 2 , Figure 3 and Figure 5 , if the asphalt-aggregate "sandwich" specimen 7 is placed vertically, the two layers of aggregates are respectively an upper aggregate and a lower aggregate, and there is one layer of asphalt between the upper aggregate and the lower aggregate, wherein:

[0033] A first receiving groove is provided on the movable die 1 for receiving one of the layers of aggregates ( Figure 1 in Figure 1 it is for receiving the lower aggregate), and two first threaded holes are provided on the movable die 1 at positions corresponding to the first receiving groove. The two first threaded holes are coaxially arranged, each first threaded hole is respectively communicated with the first receiving groove, and a first bolt 3 is respectively installed at each first threaded hole, so that the two first bolts 3 cooperate to clamp the aggregate in the first receiving groove. The size and shape of the aggregate in the first receiving groove are the same as those of the first receiving groove. When installing the asphalt-aggregate "sandwich" specimen 7, the two first bolts respectively abut against the opposite sides of the aggregate.

[0034] The stationary mold 2 is provided with a second receiving groove at a position corresponding to the first receiving groove for receiving another layer of aggregate ( Figure 1 in this case, it is for receiving the upper aggregate), and the stationary mold 2 is provided with two second threaded holes at positions corresponding to the second receiving groove. These two second threaded holes are coaxially arranged, and each second threaded hole communicates with the second receiving groove respectively. And a second bolt 10 is installed at each second threaded hole respectively so that the two second bolts 10 cooperate to clamp the aggregate in the second receiving groove. The size and shape of the aggregate in the second receiving groove are consistent with those of the second receiving groove. Both the first receiving groove and the second receiving groove are preferably square grooves, so the aggregate is also square, which is convenient for manufacturing, forming and testing the shear force. When installing the asphalt-aggregate "sandwich" specimen 7, the two second bolts 10 respectively abut against the opposite sides of the aggregate.

[0035] There is a gap between the moving mold 1 and the stationary mold 2 so that the asphalt can be placed at this gap, that is, the asphalt is exposed outside the moving mold 1 and the stationary mold 2.

[0036] Furthermore, the moving mold 1 is integrally Z-shaped, and the moving mold 1 is provided with a first shear plane, which cooperates with the stationary mold 2 to shear the asphalt-aggregate "sandwich" specimen 7. The stationary mold 2 is integrally L-shaped, and the stationary mold 2 is provided with a second shear plane parallel to the first shear plane at a position corresponding to the moving mold 1, and a gap is formed between the second shear plane and the first shear plane. The shear plane is similar to a blade surface. When the first shear plane on the moving mold 1 moves, it cooperates with the second shear plane to shear the asphalt-aggregate "sandwich" specimen 7. The three-dimensional Z-shaped and L-shaped shapes of the two components of the shear mold 16 make the forces provided by the shear mold 16 in the left-right direction parallel to each other and not on the same horizontal line. This shear mold 16 can ensure the efficient and smooth completion of the shear test, and has a simple structure and is convenient to use. The shear mold 16 is designed with two asymmetric parts. The shape of the moving mold 1 for receiving the lower aggregate presents a three-dimensional Z shape, while the stationary mold 2 for receiving the upper aggregate presents a three-dimensional L shape. This design can enable the moving mold 1 and the stationary mold 2 to be accurately paired, and provides sufficient shear surfaces, thus forming an accurate shear area. This asymmetric design can better meet the requirements of the shear test for force, ensuring the accuracy and rationality of the test results.

[0037] Furthermore, the moving mold 1 is provided with a first positioning surface, and the stationary mold 2 is provided with a second positioning surface. The first positioning surface is attached to the second positioning surface to facilitate the alignment of the first receiving groove and the second receiving groove, and facilitate the subsequent installation of the asphalt-aggregate "sandwich" specimen 7.

[0038] Further, a plurality of connection holes are provided on the moving die 1 for connecting a moving shaft 8 driven by a power mechanism. The connection holes are bolted to the moving shaft 8, and the moving shaft 8 can move the moving die 1 in a direction parallel to the interface between the aggregate and the asphalt. In addition, a plurality of connection holes 2 are provided on the fixed die 2, and the fixed die 2 is fixedly installed on a stationary shaft 9.

[0039] Referring to Figure 4 , Figure 5 , according to another aspect of the present invention, a testing machine for asphalt-aggregate "sandwich" specimens 7 is further provided, including the shear die 16 described above, and further including a controller 13, a temperature chamber 15, a moving shaft 8, a stationary shaft 9, and a power mechanism, wherein:

[0040] The controller 13 is connected to the temperature chamber 15 to keep the temperature chamber 15 at a constant temperature; preferably, a temperature control sensor module 14 is further provided in the temperature chamber 15, and the temperature control sensor module 14 is connected to the controller 13 for temperature feedback, so as to accurately control the temperature of the temperature chamber 15.

[0041] The entire shear die 16 is located inside the temperature chamber 15.

[0042] The stationary shaft 9 is fixedly installed on the temperature chamber 15, and the fixed die 2 of the shear die 16 is fixedly installed on the stationary shaft 9.

[0043] The power mechanism is installed on the temperature chamber 15, and the power mechanism is connected to the moving shaft 8 to drive the moving shaft 8 to move, and the moving die 1 of the shear die 16 is installed on the moving shaft 8.

[0044] The shear die 16 of the present invention can apply forces in different directions to the asphalt-aggregate "sandwich" specimen 7. Both the moving die 1 and the fixed die 2 can be divided into two parts, one part is the instrument connection part, and the other part is the asphalt-aggregate "sandwich" specimen connection part. The first receiving groove and the second receiving groove are respectively provided on the asphalt-aggregate "sandwich" specimen connection part of the moving die 1 and the asphalt-aggregate "sandwich" specimen connection part of the fixed die 2. The instrument connection part of the moving die 1 is connected to the moving shaft 8, and the instrument connection part of the fixed die 2 is connected to the stationary shaft 9.

[0045] The instrument connection part of the moving die 1 is tightly connected and firmly fixed to the end of the moving shaft 8 through fasteners, ensuring that the moving die 1 will not move or deviate from the predetermined position during the test. The instrument connection part of the stationary die 2 is tightly connected and firmly fixed to the end of the stationary shaft 9 through fasteners, ensuring that the stationary die 2 will not move or deviate from the predetermined position during the test. The asphalt-aggregate "sandwich" specimen connection parts of the moving die 1 and the stationary die 2 are fixed to the asphalt-aggregate "sandwich" specimen 7 through the first bolt 3 and the second bolt 10 respectively, and allow fine adjustment of the asphalt-aggregate "sandwich" specimen 7 to ensure the accurate placement and stable test of the asphalt-aggregate "sandwich" specimen 7. The forces provided by the shear die 16 in the left-right direction are parallel to each other and not on the same horizontal line. At the same time, in the asphalt-aggregate "sandwich" specimen 7, the aggregate parts protrude the same distance from the moving die 1 and the stationary die 2, ensuring that the position of the asphalt-aggregate "sandwich" specimen 7 in each part of the shear die 16 is the same, so as to ensure that the distance from the force application point of each part of the shear die 16 to the interface of the asphalt-aggregate is the same, ensuring that the shear force is reasonably applied to the asphalt-aggregate "sandwich" specimen 7. The fasteners can be bolt parts or a combination of bolts + nuts.

[0046] The instrument connection parts of the moving die 1 and the stationary die 2 are carefully arranged outside the left and right sides of the asphalt-aggregate "sandwich" specimen connection parts. Such a layout ensures a stable connection between the die and the instrument (mainly the moving shaft 8 and the stationary shaft 9 of the testing machine). When the shear die 16 is fixed to the moving shaft 8 and the stationary shaft 9 through fasteners, the moving die 1 and the asphalt-aggregate "sandwich" specimen 7 can change with the left-right movement of the moving shaft 8. This design not only enhances the connection stability between the die and the instrument, but also provides greater flexibility and convenience for the test operation.

[0047] The instrument connection part of the stationary die 2 has a square base (or called a connecting plate) that matches the size of the end of the moving shaft 8. Connection holes corresponding to the threaded holes at the end of the stationary shaft 9 are designed on the square base, and these connection holes are used to accommodate fasteners. Figure 2 、 Figure 5 In, three fasteners are shown on the stationary die 2. The large fastener is the first fastener 4, and the small fastener is the second fastener 5. Through the three fasteners, the stationary die 2 can be firmly connected to the stationary shaft 9 by using the three fasteners on the square base of the stationary die 2. These fasteners will generate a locking force with the threads at the end of the stationary shaft 9 when tightened, thus ensuring a stable connection between the stationary die 2 and the stationary shaft 9.

[0048] The instrument connection part of the moving die 1 has a square base (or called connecting plate) that matches the size of the end of the moving shaft 8. Connecting holes corresponding to the threaded holes at the end of the moving shaft 8 are designed on this square base, and these connecting holes are used to accommodate fasteners. Figure 2 , Figure 5 In Figure 2 and Figure 5 , three fasteners are shown on the moving die 1. The large fastener is the third fastener 11, and the small fastener is the fourth fastener 12. Through the three fasteners, the moving die 1 can be firmly connected to the moving shaft 8 by using the three fasteners on the square base of the moving die 1. When these fasteners are tightened, they will generate a locking force with the threads at the end of the moving shaft 8, thus ensuring a stable connection between the moving die 1 and the moving shaft 8.

[0049] The part of the shear die 16 for placing the asphalt-aggregate "sandwich" specimen 7, which is the connection part of the asphalt-aggregate "sandwich" specimen, is designed with two square slots that penetrate up and down. The sizes of these two square slots are precisely calculated to ensure that the asphalt-aggregate "sandwich" specimen 7 can be stably placed in them. To firmly fix the asphalt-aggregate "sandwich" specimen 7, threaded holes and bolts are equipped on both sides of each square slot. In addition, to ensure the accuracy of the shear test, the two square slots are precisely adjusted to the same vertical line, so as to ensure that the asphalt-aggregate "sandwich" specimen 7 is fixed in the die in a completely vertical state, avoiding test errors caused by angular deviation.

[0050] After the moving die 1, the fixed die 2 of the shear die 16 are connected and fixed to the moving shaft 8 and the stationary shaft 9, a reasonable gap will be reserved between the moving die 1 and the fixed die 2 to expose the asphalt outside the moving die 1 and the fixed die 2. The design of this gap aims to prevent the asphalt at the asphalt-aggregate interface from adhering to the die surface unnecessarily during the test, thus ensuring the accuracy of the test.

[0051] The described shear die 16 is made of steel as a whole to ensure that the shear die 16 has sufficient structural strength and durability. Steel can meet the requirements of the shear die 16 to withstand various stresses and environmental conditions during the test due to its excellent mechanical properties and corrosion resistance. In addition, the fasteners, the first bolt 3 and the second bolt 10 are all made of metal, ensuring a firm connection between the shear die and the asphalt-aggregate "sandwich" specimen 7. Metal has excellent load-bearing capacity and stability, which can effectively prevent problems caused by loosening or deformation during the test, thus ensuring the accuracy and reliability of the test. At the same time, the shear die 16 is made of rigid material and will not deform, so there will be no so-called bending moment.

[0052] In the actual use process, the installation and use steps of the testing machine are as follows:

[0053] S1: Start controller 13 and perform relevant parameter settings. First, the initial position of the moving axis 8 needs to be set to ensure a reasonable distance between it and other parts of the testing machine for smooth subsequent operations. Next, according to the test requirements, the temperature of the temperature chamber 15 needs to be adjusted to a predetermined value to simulate the required test environment temperature. In addition, the moving speed of the moving axis 8 is also an important parameter, so it needs to be set reasonably according to specific circumstances.

[0054] S2: The operation process of the shear die 16 is as follows: An accurate and scientific installation method is adopted. First, align the connection holes of the instrument connection part of the moving die 1 with the corresponding slots of the moving axis 8, and firmly fix the instrument connection part of the moving die 1 and the end of the moving axis 8 through fasteners. Similarly, align the connection holes of the fixed die 2 with the corresponding slots of the stationary axis 9, and fix the fixed die 2 and the end of the stationary axis 9 through fasteners. Next, precisely control the moving axis 8 to move towards the stationary axis 9 by the controller 13. This moving process is precisely controlled by a computer to ensure that the first receiving groove of the moving die 1 and the second receiving groove of the fixed die 2 of the shear die 16 can be precisely aligned. When the first receiving groove and the second receiving groove are completely aligned, the system will stop the movement of the moving axis 8. Then, place the asphalt-aggregate "sandwich" specimen 7 to be tested into the aligned first and second receiving grooves, and use the first bolt and the second bolt to press against the aggregate, thereby fixing the asphalt-aggregate "sandwich" specimen 7 on the shear die 16. To ensure the stability of the asphalt-aggregate "sandwich" specimen 7 during the test, use two pairs of bolts (one pair of first bolts 3 and one pair of second bolts 10) to fix the asphalt-aggregate "sandwich" specimen 7 in sequence, ensuring that each bolt is evenly tightened to prevent the asphalt-aggregate "sandwich" specimen 7 from moving or being misaligned during the test. After the above steps, the fixed die 2, the moving die 1, and the asphalt-aggregate "sandwich" specimen 7 are installed and fixed. At this time, the controller 13 has completed all the adjustment work and is ready to start the shear test.

[0055] S3: By integrating an advanced controller 13, the user only needs to click the "Start Test" button on the screen to start the shear test to measure the shear force. This system not only simplifies the operation steps but also ensures a high degree of standardization and repeatability of the test process through precise programming and algorithms. Therefore, it can accurately and quickly collect and process data, providing scientific and reliable adhesion test results for the user. This design significantly improves the scientificity and accuracy of the test process, making the adhesion test more efficient and credible.

[0056] Those skilled in the art can easily understand that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A shear die for testing asphalt-aggregate "sandwich" specimens, where the asphalt-aggregate "sandwich" specimen has a structure of two layers of aggregate sandwiching one layer of asphalt, and is characterized in that, The shearing die includes a fixed die and a moving die that can move relative to the fixed die to shear the asphalt-aggregate "sandwich" specimen, where: A first receiving groove is provided on the moving die for receiving one layer of aggregate, and two first threaded holes are provided on the moving die at positions corresponding to the first receiving groove. The two first threaded holes are coaxially arranged, each first threaded hole communicates with the first receiving groove respectively, and a first bolt is installed at each first threaded hole so that the two first bolts cooperate to clamp the aggregate in the first receiving groove; A second receiving groove is provided on the fixed die at a position corresponding to the first receiving groove for receiving the other layer of aggregate, and two second threaded holes are provided on the fixed die at positions corresponding to the second receiving groove. The two second threaded holes are coaxially arranged, each second threaded hole communicates with the second receiving groove respectively, and a second bolt is installed at each second threaded hole so that the two second bolts cooperate to clamp the aggregate in the second receiving groove; A gap exists between the moving die and the fixed die so that the asphalt can be placed at this gap.

2. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 1, characterized in that, The moving die is integrally Z-shaped, and a first shearing plane is provided on the moving die.

3. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 2, characterized in that, The fixed die is integrally L-shaped, and a second shearing plane parallel to the first shearing plane is provided on the fixed die at a position corresponding to the moving die, and the gap is formed between the second shearing plane and the first shearing plane.

4. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 1, characterized in that, A first positioning surface is provided on the moving die, and a second positioning surface is provided on the fixed die. The first positioning surface fits with the second positioning surface to facilitate the alignment of the first receiving groove and the second receiving groove.

5. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 1, characterized in that, A plurality of connection holes are provided on the moving die to facilitate the connection of a moving shaft driven by a power mechanism.

6. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 1, characterized in that, A plurality of connection holes are provided on the fixed die to facilitate the connection of a stationary shaft.

7. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 1, characterized in that, Both the moving die and the fixed die are made of steel.

8. The shear die for testing asphalt-aggregate "sandwich" specimens according to claim 1, characterized in that, Both the first receiving groove and the second receiving groove are square grooves.

9. A testing machine for asphalt-aggregate "sandwich" specimens, comprising the shear die according to any one of claims 1 to 8, characterized in that, It further includes a controller, a temperature chamber, a moving shaft, a stationary shaft, and a power mechanism, where: The controller is connected to the temperature chamber; The shearing die is located inside the temperature chamber; The stationary shaft is fixedly installed on the temperature chamber, and the fixed die of the shearing die is fixedly installed on the stationary shaft; The power mechanism is installed on the temperature chamber, and the power mechanism is connected to the moving shaft to drive the moving shaft to move. The moving die of the shearing die is installed on the moving shaft.

10. The testing machine for asphalt-aggregate "sandwich" specimen testing according to claim 9, wherein, A temperature control sensor module is provided inside the temperature chamber, and the temperature control sensor module is connected to the controller.

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