Device for testing low-temperature performance of asphalt mixture

Abstract

The utility model provides an asphalt mixture low-temperature performance testing device which comprises a temperature control box, a loading device and a loading synergy structure, and the loading device comprises a loading column; the number of the loading devices is three; the upper end of a first vertical rod of the loading cooperation structure abuts against the top of the inner wall of the temperature control box, the lower end of the first vertical rod is connected to the middle point of a first transverse rod, the two ends of the first transverse rod are connected to the upper ends of two second vertical rods correspondingly, and the lower ends of the two second vertical rods are connected to a second transverse rod correspondingly. The two ends and the middle point of the second cross rod are connected to the upper ends of three third vertical rods respectively, and the lower ends of the three third vertical rods are connected to loading columns of the three loading devices respectively; the ratio of the first distance to the second distance is 1: 2. According to the structural arrangement, the downward pressing force borne by the first vertical rod can be uniformly distributed on the three loading columns, so that three samples in the same group can be tested, the consumed time is short, the influence of parameter fluctuation is avoided, and the accuracy of an integrated and averaged result is improved.

Description

Technical Field

[0001] The utility model relates to the field of asphalt test equipment, and particularly relates to a device for testing the low-temperature performance of asphalt mixtures. Background Art

[0002] As one of the main materials for road construction, the performance of asphalt mixtures will be affected in low-temperature environments, such as hardening and cracking. Therefore, it is particularly important to evaluate the low-temperature performance of asphalt mixtures. Among them, the bearing capacity of asphalt mixtures is one of the key indicators.

[0003] In the existing devices for testing the low-temperature performance of asphalt mixtures, when testing multiple specimens in the same group, the specimens are successively placed individually in a low-temperature environment, and the loading column is pressed downward in the middle of the pressing beam fixed at both ends to load each individual specimen for testing. In this way, when testing multiple specimens in the same group, it takes a long time; and due to mechanical errors in each loading of the pressing beam and parameter fluctuations in the low-temperature environment over time, the test data obtained for each of the multiple specimens is not under strictly controlled variables, and the result obtained after integration and averaging is not accurate enough. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the defects that the existing device for testing the low-temperature performance of asphalt mixtures takes a long time when testing multiple specimens in the same group and the result obtained after integration and averaging is not accurate enough, and to provide a device for testing the low-temperature performance of asphalt mixtures.

[0005] The utility model solves the above technical problem through the following technical solutions:

[0006] A device for testing the low-temperature performance of asphalt mixtures, which includes a temperature control box and a loading device. The loading device includes a loading column;

[0007] The number of the loading devices is three;

[0008] The device for testing the low-temperature performance of asphalt mixtures further includes a loading coordination structure, which includes a first vertical rod, a second vertical rod, a third vertical rod, a first cross rod and a second cross rod. The upper end of the first vertical rod abuts against the inner wall top of the temperature control box, the lower end of the first vertical rod is connected to the midpoint of the first cross rod, the two ends of the first cross rod are respectively connected to the upper ends of the two second vertical rods, the lower ends of the two second vertical rods are respectively connected to the second cross rod, the two ends and the midpoint of the second cross rod are respectively connected to the upper ends of the three third vertical rods, and the three loading devices are sequentially placed at the inner wall bottom of the temperature control box along the extension direction of the second cross rod. The lower ends of the three third vertical rods are respectively connected to the loading columns of the three loading devices;

[0009] Define the distance from the end of the second cross bar to the lower end of the second vertical bar along the axis direction of the second cross bar as the first distance, and define the distance from the midpoint of the second cross bar to the lower end of the second vertical bar along the axis direction of the second cross bar as the second distance. The ratio of the first distance to the second distance is 1:2.

[0010] In this technical solution, by providing this asphalt mixture low-temperature performance testing device, the above structural settings can make the downward pressure received at the first vertical bar be evenly distributed on the three loading columns. In this way, three specimens in the same group can be tested simultaneously, which takes less time, avoids the influence of parameter fluctuations, and improves the accuracy of the results obtained after integration and averaging.

[0011] Preferably, the temperature control box includes a controller, a load sensor, and a data input unit. The load sensor is detachably connected to the pressure head of the loading column and is electrically connected to the controller. The data input unit is also electrically connected to the controller;

[0012] The loading device further includes a driving unit for driving the loading cooperative structure to displace. The driving unit is electrically connected to the controller.

[0013] In this technical solution, through the above structural settings, the controller can be used to control the opening or closing of the driving unit according to the data of the data input unit and the load sensor, improving the automation degree of this asphalt mixture low-temperature performance testing device.

[0014] Preferably, the data input unit includes a display screen and an input keyboard.

[0015] In this technical solution, by setting the data input unit to include a display screen and an input keyboard, it is convenient for the tester to directly input data such as load into this asphalt mixture low-temperature performance testing device, enhancing the tester's usage experience.

[0016] Preferably, the temperature control box further includes a temperature sensor and a refrigeration device. The temperature sensor is located on the inner wall side of the temperature control box and is electrically connected to the controller.

[0017] In this technical solution, by setting the temperature control box to further include a temperature sensor and a refrigeration device, with the temperature sensor located on the inner wall side of the temperature control box and electrically connected to the controller, the controller can also be used to control the refrigeration device to refrigerate the interior of the temperature control box according to the data of the data input unit and the temperature sensor.

[0018] Preferably, the temperature control box further includes a displacement sensor. The displacement sensor is detachably connected to the pressure head of the loading column and is electrically connected to the controller.

[0019] In this technical solution, by providing that the temperature control box further includes a displacement sensor, the displacement sensor is detachably connected to the pressing head of the loading column and electrically connected to the controller, and the controller can also be used to control the opening or closing of the driving part according to the data of the data input part and the displacement sensor.

[0020] Preferably, the loading device further includes a bracket and a specimen container, and the specimen container is detachably connected to the bracket.

[0021] In this technical solution, by providing that the loading device further includes a bracket and a specimen container, and the specimen container is detachably connected to the bracket, the specimen container can be supported with a relatively simple structure, avoiding problems such as the specimen tipping over during pressure bearing.

[0022] Preferably, the specimen container includes an extension part having a first fixing hole, and the bracket includes a connecting part having a second fixing hole, and the first fixing hole and the second fixing hole are correspondingly arranged;

[0023] The asphalt mixture low-temperature performance testing device further includes a fixing member, and the fixing member is detachably inserted through the first fixing hole and the second fixing hole.

[0024] In this technical solution, by providing that the specimen container includes an extension part having a first fixing hole, the bracket includes a connecting part having a second fixing hole, and the first fixing hole and the second fixing hole are correspondingly arranged; the asphalt mixture low-temperature performance testing device further includes a fixing member, and the fixing member is detachably inserted through the first fixing hole and the second fixing hole, the specimen container can be further fixed with a relatively simple structure.

[0025] Preferably, the number of the extension parts is two, the two extension parts are symmetric to each other along the axis of the specimen container, and the two connecting parts are also symmetric to each other along the axis of the specimen container.

[0026] In this technical solution, by providing that the number of the extension parts is two, the two extension parts are symmetric to each other along the axis of the specimen container, and the two connecting parts are also symmetric to each other along the axis of the specimen container, the two ends of the specimen container can be balanced in force when being fixed, avoiding the problem that the surface of the asphalt specimen is unevenly stressed due to the specimen container tipping over during pressure bearing.

[0027] Preferably, a stabilizing part is provided on the bracket, and the loading column is inserted through the loading hole of the stabilizing part.

[0028] In this technical solution, by providing that there is a stabilizing part on the bracket and the loading column is inserted through the loading hole of the stabilizing part, the loading column can be further stabilized, avoiding the problem that the surface of the asphalt specimen is unevenly stressed due to the instability of the loading column.

[0029] Preferably, the cross-sectional shape of the indenter of the loading column corresponds to the cross-sectional shape of the specimen container.

[0030] In this technical solution, by setting the cross-sectional shape of the indenter of the loading column to correspond to the cross-sectional shape of the specimen container, the problem of uneven stress on the surface of the asphalt specimen can be further avoided.

[0031] The positive and progressive effects of the present utility model are as follows:

[0032] In this technical solution, by providing the low-temperature performance testing device for asphalt mixture, the above structural settings can make the downward pressure received at the first vertical rod be evenly distributed on the three loading columns. In this way, the tests of three specimens in the same group can be carried out simultaneously, which takes less time, avoids the influence of parameter fluctuations, and improves the accuracy of the result obtained after integration and averaging. Description of the Drawings

[0033] Figure 1 Schematic perspective view of the loading cooperation structure and the loading device according to an embodiment of the present utility model.

[0034] Figure 2 Schematic perspective view of the low-temperature performance testing device for asphalt mixture according to an embodiment of the present utility model.

[0035] Figure 3 Schematic open elevation view of the low-temperature performance testing device for asphalt mixture according to an embodiment of the present utility model.

[0036] Figure 4 Schematic perspective view of the specimen container according to an embodiment of the utility model.

[0037] Figure 5 Flowchart of the low-temperature performance testing method for asphalt mixture according to an embodiment of the present utility model.

[0038] Description of the Reference Numerals:

[0039] Temperature control box 1

[0040] Display screen 111

[0041] Input keyboard 112

[0042] Temperature sensor 12

[0043] Door 13

[0044] Condensation conduit 14

[0045] Circuit 15

[0046] Refrigeration equipment 16

[0047] Heat dissipation port 17

[0048] Loading device 2

[0049] Loading column 21

[0050] Connection part 221

[0051] Stabilizing part 222

[0052] Specimen container 23

[0053] Extension part 231

[0054] Loading cooperation structure 3

[0055] First vertical rod 31

[0056] Second vertical rod 32

[0057] Third vertical rod 33

[0058] First cross rod 34

[0059] Second cross rod 35

[0060] Fixing part 4 Specific implementation mode

[0061] The following is a preferred embodiment and is described in more clearly and completely in conjunction with the attached drawings to illustrate the present utility model. As Figures 1 - 4 shown, this embodiment provides a low-temperature performance testing device for asphalt mixture, which includes a temperature control box 1 and a loading device 2. The loading device 2 includes a loading column 21, and the number of the loading devices 2 is three.

[0062] The low-temperature performance testing device for asphalt mixture further includes a loading cooperation structure 3. The loading cooperation structure 3 includes a first vertical rod 31, a second vertical rod 32, a third vertical rod 33, a first cross rod 34 and a second cross rod 35. The upper end of the first vertical rod 31 abuts against the inner wall top of the temperature control box 1, the lower end of the first vertical rod 31 is connected to the midpoint of the first cross rod 34, both ends of the first cross rod 34 are respectively connected to the upper ends of two second vertical rods 32, the lower ends of the two second vertical rods 32 are respectively connected to the second cross rod 35, both ends and the midpoint of the second cross rod 35 are respectively connected to the upper ends of three third vertical rods 33, and the three loading devices 2 are sequentially arranged along the extending direction of the second cross rod 35 at the inner wall bottom of the temperature control box 1. The lower ends of the three third vertical rods 33 are respectively connected to the loading columns 21 of the three loading devices 2.

[0063] Define the distance from the end of the second cross rod 35 to the lower end of the second vertical rod 32 along the axis direction of the second cross rod 35 as the first distance D1, and define the distance from the midpoint of the second cross rod 35 to the lower end of the second vertical rod 32 along the axis direction of the second cross rod 35 as the second distance D2, and D1:D2 = 1:2.

[0064] In this way, by providing the asphalt mixture low-temperature performance testing device, the downward pressure received at the first vertical rod 31 can be evenly distributed on the three loading columns 21, so that the tests of three specimens in the same group can be carried out, which takes a short time, avoids the influence of parameter fluctuations, and improves the accuracy of the result obtained after integration and averaging.

[0065] In this embodiment, the temperature control box 1 includes a controller (not shown in the figure), a load sensor (not shown in the figure), and a data input unit. The load sensor is detachably connected to the pressure head of the loading column 21 and is electrically connected to the controller. The data input unit is also electrically connected to the controller.

[0066] The loading device 2 further includes a driving unit (not shown in the figure). The driving unit is used to drive the loading cooperation structure 3 to displace, and the driving unit is electrically connected to the controller.

[0067] In this way, the controller can be used to control the opening or closing of the driving unit according to the data of the data input unit and the load sensor, improving the automation degree of the asphalt mixture low-temperature performance testing device.

[0068] In this embodiment, the data input unit includes a display screen 111 and an input keyboard 112. In this way, it is convenient for the tester to directly input data such as load into the asphalt mixture low-temperature performance testing device, improving the user experience of the tester.

[0069] In this embodiment, the temperature control box 1 further includes a temperature sensor 12 and a refrigeration device 16. The temperature sensor 12 is located on the inner wall side of the temperature control box 1, and the temperature sensor 12 is electrically connected to the controller. In this way, the controller can also be used to control the refrigeration device 16 to refrigerate the inside of the temperature control box 1 according to the data of the data input unit and the temperature sensor 12.

[0070] In this embodiment, the temperature control box 1 further includes a displacement sensor (not shown in the figure). The displacement sensor is detachably connected to the pressure head of the loading column 21 and is electrically connected to the controller. In this way, the controller can also be used to control the opening or closing of the driving unit according to the data of the data input unit and the displacement sensor.

[0071] In this embodiment, the loading device 2 further includes a bracket and a specimen container 23. The specimen container 23 and the bracket are detachably connected. In this way, the specimen container 23 can be supported with a relatively simple structure, avoiding problems such as the specimen tipping over during the pressure-bearing process.

[0072] Please refer back to Figure 4 , in this embodiment, the specimen container 23 includes an extension part 231 having a first fixing hole, and the bracket includes a connecting part 221 having a second fixing hole. The first fixing hole and the second fixing hole are correspondingly arranged.

[0073] The low-temperature performance test device for asphalt mixture further includes a fixing member 4, and the fixing member 4 is detachably inserted through the first fixing hole and the second fixing hole. In this way, the specimen container 23 can be further fixed with a relatively simple structure.

[0074] In this embodiment, the number of the extension parts 231 is two, and the two extension parts 231 are symmetric to each other along the axis of the specimen container 23, and the two connecting parts 221 are also symmetric to each other along the axis of the specimen container 23. In this way, when the specimen container 23 is fixed, the forces at both ends are balanced, avoiding the problem that the surface of the asphalt specimen is unevenly stressed due to the specimen container 23 turning over under pressure.

[0075] In this embodiment, a stabilizing part 222 is provided on the bracket, and the loading column 21 is inserted through the loading hole of the stabilizing part 222. In this way, the loading column 21 can be further stabilized, avoiding the problem that the surface of the asphalt specimen is unevenly stressed due to the instability of the loading column 21.

[0076] In this embodiment, the cross-sectional shape of the pressing head of the loading column 21 corresponds to the cross-sectional shape of the specimen container 23. In this way, the problem that the surface of the asphalt specimen is unevenly stressed can be further avoided.

[0077] In this embodiment, the temperature control box 1 further includes a box door 13, a condensation conduit 14, a circuit 15, and a heat dissipation port. When the box door 13 is opened, it can be seen that the inner wall of the temperature control box 1 is provided with a condensation conduit 14 surrounding the inner wall of the temperature control box 1, and the condensation conduit 14 is connected to an external refrigeration device 16. The extension part 231 of the loading device 2 has good heat conduction performance to ensure that the specimen can quickly reach the temperature inside the temperature control box 1.

[0078] The circuit 15 connects each structure and input device, etc. to the controller. The controller is built-in with a data acquisition and processing system, which can set the test temperature inside the temperature control box 1 in real time, collect data such as the temperature, load, and deformation of the specimen in real time, and process and analyze the data to obtain the performance indexes of the asphalt mixture in a low-temperature environment. The required load, deformation, and temperature data can be input through the input keyboard 112, and the pressing head load and displacement values will also be displayed on the display screen 111. In this way, the stress situation during the actual road use process can be well simulated.

[0079] As Figure 5 shown, this embodiment also provides a method for testing the low-temperature performance of asphalt mixture, which uses the above-mentioned low-temperature performance test device for asphalt mixture to evaluate the performance of asphalt mixture in a low-temperature environment. The steps include:

[0080] S1. Load the asphalt mixture to be tested into the specimen container 23;

[0081] S2. Fix the sample container 23 on the connection part 221 through the fixing part 44, and connect the three third vertical rods 33 of the loading cooperation structure 3 to the three loading columns 21 respectively;

[0082] S3. Close the box door 13, and input the required load, deformation and temperature data through the input keyboard 112;

[0083] S4. Cool down through the refrigeration device 16, and conduct the cold air to the inner wall of the temperature control box 11 by using the condensation conduit 14; By loading and unloading the first vertical rod 31, the loading column 21 performs a certain number of loadings and unloadings on the asphalt mixture to simulate the actual road stress situation;

[0084] S5. The controller processes the relevant data of the data input part, displacement sensor, load sensor and temperature sensor 12, and displays the processed information through the display screen 111.

[0085] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that this is only an example. The protection scope of the present invention is defined by the appended claims. Without departing from the principle and essence of the present invention, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A low temperature performance testing device for asphalt mixture, comprising a temperature control box and a loading device, wherein the loading device comprises a loading column; characterized in that: The number of the loading devices is three; The asphalt mixture low temperature performance test device also includes a loading coordination structure, which includes a first vertical rod, a second vertical rod, a third vertical rod, a first cross rod and a second cross rod, the upper end of the first vertical rod abuts against the top of the inner wall of the temperature control box, the lower end of the first vertical rod is connected to the midpoint of the first cross rod, the two ends of the first cross rod are respectively connected to the upper ends of two second vertical rods, the lower ends of the two second vertical rods are respectively connected to the second cross rods, the two ends and the midpoint of the second cross rod are respectively connected to the upper ends of three third vertical rods, the three loading devices are sequentially placed at the bottom of the inner wall of the temperature control box along the extension direction of the second cross rod, and the lower ends of the three third vertical rods are respectively connected to the loading columns of the three loading devices; The distance from the end of the second cross bar to the lower end of the second vertical bar along the axis direction of the second cross bar is defined as a first distance, and the distance from the midpoint of the second cross bar to the lower end of the second vertical bar along the axis direction of the second cross bar is defined as a second distance, and the ratio of the first distance to the second distance is 1:

2.

2. The asphalt mixture low temperature performance testing device according to claim 1, characterized in that: The temperature control box includes a controller, a load sensor and a data input unit, wherein the load sensor is detachably connected to the pressure head of the loading column and is electrically connected to the controller, and the data input unit is also electrically connected to the controller; The loading device further includes a driving unit, which is used to drive the loading cooperative structure to move, and the driving unit is electrically connected to the controller.

3. The asphalt mixture low temperature performance testing device according to claim 2, characterized in that: The data input unit includes a display screen and an input keyboard.

4. The asphalt mixture low temperature performance testing device according to claim 2, characterized in that: The temperature control box also includes a temperature sensor and a refrigeration device. The temperature sensor is located on the inner wall side of the temperature control box, and the temperature sensor is electrically connected to the controller.

5. The asphalt mixture low temperature performance testing device according to claim 4, characterized in that: The temperature control box also includes a displacement sensor, which is detachably connected to the pressure head of the loading column and electrically connected to the controller.

6. The asphalt mixture low temperature performance testing device according to claim 1, characterized in that: The loading device also includes a support and a sample container, and the sample container and the support are detachably connected.

7. The asphalt mixture low temperature performance testing device according to claim 6, characterized in that: The sample container includes an extension portion having a first fixing hole, the bracket includes a connection portion having a second fixing hole, and the first fixing hole and the second fixing hole are arranged correspondingly; The asphalt mixture low temperature performance testing device also includes a fixing member, and the fixing member is detachably inserted into the first fixing hole and the second fixing hole.

8. The asphalt mixture low temperature performance testing device according to claim 7, characterized in that: The number of the extending portions is two, the two extending portions are symmetrical to each other along the axis of the sample container, and the two connecting portions are also symmetrical to each other along the axis of the sample container.

9. The asphalt mixture low temperature performance testing device according to claim 6, characterized in that: The bracket is provided with a stabilizing portion, and the loading column is passed through a loading channel of the stabilizing portion.

10. The asphalt mixture low temperature performance testing device according to claim 6, characterized in that: The cross-sectional shape of the pressure head of the loading column corresponds to the cross-sectional shape of the sample container.

Images