Device for double-layer shear test of asphalt mixture
By designing a double-layer shear test device for asphalt mixtures with double-layer clamps and hydraulic jacks, the problem that existing devices cannot simulate the gravity of vehicles was solved, and more accurate asphalt mixture shear test results were achieved.
Patent Information
- Application Number
- CN202520317465.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-02-26
AI Technical Summary
Existing asphalt mixture shearing devices lack simulation of vehicle gravity, resulting in discrepancies between measurement data and actual applications, which affects road performance.
A double-layer shear test device for asphalt mixtures, comprising a double-layer clamp and a hydraulic jack, was designed. The double-layer clamp provides vertical and horizontal constraint forces, while the hydraulic jack simulates vehicle loads, enabling a test that more closely approximates actual stress conditions.
This improves the accuracy and scientific rigor of asphalt mixture shear tests, making the test results more consistent with the actual stress conditions of asphalt pavements.
Smart Images
Figure CN223637298U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to asphalt mixture test technical field especially relates to a device of asphalt mixture double -layer shearing test. BACKGROUND
[0002] In recent years, with the increase of traffic volume, the rut phenomenon of the asphalt pavement of the expressway and the first and second class highway is more and more common. The formation of the asphalt pavement rut is the result of the combined action of the extrusion compaction and the shear deformation of the asphalt mixture. For the newly built pavement or the pavement with insufficient compaction, the compaction effect is more obvious. And for the pavement that has been opened to traffic for a period of time or the pavement with good compaction, with the increase of the axle load number, the asphalt mixture under the rut produces the isometric shear flow deformation, but due to the lateral extrusion, the mixture rises on the edge of the axle load, and the rut is formed.
[0003] The shear performance is an important mechanical performance index of the asphalt mixture, and is closely related to the high-temperature stability of the asphalt mixture. The shear device adopted in the research on the interlayer shear performance of the asphalt pavement by Russian Guangxun et al. only has the vertical force, and there is no force constraint in the horizontal direction of the test piece. The clamp adopted in the device lacks the simulation of the automobile gravity, so that the measured data has certain deviation from the actual application, and further influences the pavement performance.
[0004] Designing an effective, fast and economical clamp for the shear test of the asphalt mixture is one of the problems to be solved at present. INVENTION CONTENTS
[0005] Based on the problems in the background art, the utility model provides a device for the double-layer shear test of the asphalt mixture to improve the shear test precision of the asphalt mixture.
[0006] The technical scheme of the utility model:
[0007] A device for the double-layer shear test of the asphalt mixture, which comprises two parts of a double-layer clamp for clamping the asphalt mixture test piece and a horizontal load applying device. The double-layer clamp comprises a left clamp and a right clamp, and both the left clamp and the right clamp are composed of two upper and lower semicircular ring-shaped steel plates. The two upper and lower semicircular ring-shaped steel plates are connected through a circular column after being closed, and are connected to the whole device through the circular column. A cavity for placing the asphalt mixture test piece is formed in the middle of the two upper and lower semicircular ring-shaped steel plates. The horizontal load applying device is mainly composed of a hydraulic jack, and the jack connects a circular horizontal constraint steel plate to apply a horizontal load to the asphalt mixture test piece.
[0008] Further, the left side of the device is provided with two rectangular columns, and a I-shaped steel plate movably connected between the two rectangular columns, and a guide rod extended from the right end of the I-shaped steel plate, and a circular left horizontal constraint steel plate welded to the right end of the guide rod for applying horizontal constraint force to the asphalt mixture test piece.
[0009] Further, four mounting holes are formed on the two sides of each semicircular ring-shaped steel plate in the left clamp, and the four mounting holes are arranged in line along the direction of the guide rod, and two circular columns pass through the middle two mounting holes, and the mounting holes on the two sides are provided with bolts for connecting the upper and lower parts, and the whole left clamp can move up and down along the circular column.
[0010] Further, three mounting holes are formed on the two sides of each semicircular ring-shaped steel plate in the right clamp, and the three mounting holes are arranged in line along the direction of the guide rod, and one circular column passes through the middle mounting hole, and the mounting holes on the two sides are provided with bolts for connecting the upper and lower parts, and the upper half steel plate of the right clamp can move up and down along the circular column.
[0011] Further, the right side of the right clamp is provided with a hydraulic jack, and a right horizontal constraint steel plate is arranged between the right clamp and the hydraulic jack, and a mechanical sensor is arranged between the hydraulic jack and the right panel of the device.
[0012] Further, the upper bottom plate and the lower bottom plate are fixed by bolts to realize the fixation of the whole device.
[0013] Further, the asphalt mixture test piece is a circular pie-shaped asphalt mixture test piece arranged on the same axis as the guide rod, and the asphalt mixture test piece is provided with vertical support force by the clamp and horizontal constraint force by the left and right horizontal constraint steel plates. During the test, the left and right horizontal constraint steel plates are continuously approached by the hydraulic jack, so as to apply horizontal pressure to the asphalt mixture test piece, and the mechanical sensor displays the horizontal pressure at this time. The upper half steel plate of the left clamp is applied with vertical pressure, and since the right clamp is fixed, the left clamp can move up and down, and the asphalt mixture test piece will be subjected to vertical shear failure.
[0014] The asphalt mixture double-layer shear test clamp has the advantages that the device can be moved in the vertical and horizontal directions by adjusting the bolts on the clamp to adapt to asphalt test pieces of different sizes, and the hydraulic jack is arranged to simulate the automobile load, so that the actual stress condition of the asphalt pavement is approached, and the test result is more scientific and rigorous. BRIEF DESCRIPTION OF DRAWINGS
[0015] Fig. 1 It is a three-dimensional rendering diagram of the double-layer shear test clamp.
[0016] Fig. 2 is a front view of a double-layer shearing test clamp;
[0017] Fig. 3 is a side view of a double-layer shearing test clamp;
[0018] Fig. 4 is a top view of a double-layer shearing test clamp;
[0019] Wherein, 1, rectangular column, 2, I-shaped steel plate, 3, guide rod, 4, first circular column, 5, second circular column, 6, third circular column, 7, left clamp upper half steel plate, 8, left clamp lower half steel plate, 9, right clamp upper half steel plate, 10, right clamp lower half steel plate, 11, hydraulic jack, 12, mechanical sensor, 13, upper base plate, 14, lower base plate, 15, right panel, 16, left side horizontal constraint steel plate, 17, right side horizontal constraint steel plate. DETAILED DESCRIPTION
[0020] Below, the technical scheme of the utility model is described in detail through specific embodiments.
[0021] As Figs. 1 to 4 shown, a device for double-layer shearing test of asphalt mixture, comprising a double-layer clamp for clamping asphalt mixture test piece and a horizontal load applying device two parts; the double-layer clamp comprises a left clamp and a right clamp, the left clamp is composed of a left clamp upper half steel plate 7 and a left clamp lower half steel plate 8, and the right clamp is composed of a right clamp upper half steel plate 9 and a right clamp lower half steel plate 10; the upper and lower half circular ring steel plates are connected through circular columns after being closed, and are connected with the whole device up and down through the circular columns; a cavity for placing asphalt mixture test piece is formed in the middle of the upper and lower half circular ring steel plates. The horizontal load applying device is mainly composed of a hydraulic jack 11, and the hydraulic jack 11 is connected with a circular horizontal constraint steel plate to apply horizontal load to the asphalt mixture test piece.
[0022] Two rectangular columns 1 are arranged on the left side of the device, and a movable I-shaped steel plate 2 is connected between the two rectangular columns 1; a guide rod 3 extends from the right end of the I-shaped steel plate 2, and a circular left horizontal constraint steel plate 16 is welded to the right end of the guide rod 3 for applying horizontal constraint force to the asphalt mixture test piece.
[0023] Four mounting holes are formed in the two sides of each half circular ring steel plate in the left clamp, and the four mounting holes are arranged in line along the direction of the guide rod 3; a first circular column 4 and a second circular column 5 pass through the middle two mounting holes, and the mounting holes on the two sides are provided with bolts to connect the upper and lower parts; the whole left clamp can move up and down along the circular column.
[0024] Three mounting holes are respectively arranged on two sides of each semicircular steel plate in the right clamp, and are arranged in a straight line along the direction of the guide rod 3. The third circular column 6 penetrates the middle mounting hole, and the mounting holes on both sides are provided with bolts to connect the upper and lower parts. The upper half steel plate 9 of the right clamp can move up and down along the circular column, and further, the lower half steel plate 10 of the right clamp is connected and fixed with the upper bottom plate 13 by welding and cannot move freely.
[0025] The right side of the right clamp is provided with a hydraulic jack 11, and a right side horizontal constraint steel plate 17 is arranged between the right clamp and the hydraulic jack 11. The mechanical sensor 12 is arranged between the hydraulic jack 11 and the right panel 15 of the device and is fixed on the right panel 15.
[0026] The upper bottom plate 13 and the lower bottom plate 14 are fixed by bolts to realize the fixation of the whole device.
[0027] The left clamp upper half steel plate 7 and the left clamp lower half steel plate 8, and the right clamp upper half steel plate 9 and the right clamp lower half steel plate 10 form a cavity for placing the asphalt mixture test piece. The cavity can be adjusted by bolts to adapt to asphalt mixture test pieces of different sizes. The left clamp can move up and down along the first circular column 4 and the second circular column to ensure that the centers of the asphalt mixture test piece, the guide rod 3 and the hydraulic jack 11 are located on a straight line.
[0028] During the experiment in the horizontal load applying device, the hydraulic jack 11 applies an axial pressure to the asphalt mixture test piece to simulate the automobile load. The value setting and reading are completed by the mechanical sensor 12 to make the measured data closer to the actual working condition of the asphalt pavement. As shown in the figure, the installation process of the asphalt mixture is as follows:
[0029] Firstly, the bolts connecting the left clamp upper half steel plate 7 and the left clamp lower half steel plate 8 in the left clamp are loosened, and the left clamp upper half steel plate 7 is taken off. The first asphalt mixture test piece is evenly coated with epoxy resin adhesive on both sides and is placed in the circular groove formed by the left clamp lower half steel plate 8. Then, the height of the first asphalt mixture test piece is adjusted so that the center of the first asphalt mixture test piece, the center of the right clamp and the axis of the hydraulic jack 11 are located at the same height. After the adjustment, the left clamp upper half steel plate 7 is sleeved on the first circular column 4 and the second circular column 5, and the bolts are tightened.
[0030] Secondly, the bolts connecting the right clamp upper half steel plate 9 and the right clamp lower half steel plate 10 in the right clamp are loosened, and the right clamp upper half steel plate 9 is taken off. The second asphalt mixture test piece is evenly coated with epoxy resin adhesive on both sides and is placed in the right circular groove formed by the right clamp lower half steel plate 10. Then, the right clamp upper half steel plate 9 is sleeved on the third circular column 6, and the bolts are tightened.
[0031] After the test piece is installed, the mechanical sensor 12 is adjusted, an initial displacement or force is set, and it is ensured that no looseness occurs between the test sample and the clamp.
[0032] Finally, after the test piece is installed and adjusted, the double-layer shearing test of the asphalt mixture can be performed through the shearing test device.
[0033] To sum up, only the preferred specific implementation of the present application is described, but the protection scope of the present application is not limited to this, any skilled person in the technical field according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application can be replaced or changed equivalently, which should be covered in the protection scope of the present application.
Claims
1. A device for asphalt mixture double-layer shear test, characterized in that, The device comprises a double-layer clamp for clamping the asphalt mixture test piece and a horizontal load applying device, and the double-layer clamp comprises a left clamp and a right clamp, both of which are composed of two upper and lower semicircular ring-shaped steel plates, and the two upper and lower semicircular ring-shaped steel plates are connected through a circular column after being closed, and are connected with the whole device through the circular column; a cavity for placing the asphalt mixture test piece is formed in the middle of the two upper and lower semicircular ring-shaped steel plates; the horizontal load applying device is mainly composed of a hydraulic jack, and the jack connects a circular horizontal constraint steel plate to apply a horizontal load to the asphalt mixture test piece.
2. The apparatus for double-layer shear test of asphalt mixture according to claim 1, characterized in that, The left side of the device is provided with two rectangular columns, and a movable I-shaped steel plate is connected between the two rectangular columns, and a guide rod extends from the right end of the I-shaped steel plate, and a circular left horizontal constraint steel plate is welded to the right end of the guide rod for applying a horizontal constraint force to the asphalt mixture test piece.
3. The apparatus for double-layer shear test of asphalt mixture according to claim 1, characterized in that, Four mounting holes are formed in the two sides of each semicircular ring-shaped steel plate in the left clamp, and the four mounting holes are arranged in a line along the direction of the guide rod, two circular columns pass through the middle two mounting holes, and the mounting holes on the two sides are provided with bolts for connecting the upper and lower parts, and the whole left clamp can move up and down along the circular column.
4. The apparatus for double-lamella shear test of asphalt mixture according to claim 1, characterized in that, Three mounting holes are formed in the two sides of each semicircular ring-shaped steel plate in the right clamp, and the three mounting holes are arranged in a line along the direction of the guide rod, one circular column passes through the middle mounting hole, and the mounting holes on the two sides are provided with bolts for connecting the upper and lower parts, and the upper half steel plate of the right clamp can move up and down along the circular column, and further, the lower half of the right clamp is fixedly connected with the upper bottom plate by welding and cannot move freely.
5. The apparatus for double-lamella shear test of asphalt mixture according to claim 1, characterized in that, The right side of the right clamp is provided with a hydraulic jack, a right horizontal constraint steel plate is arranged between the right clamp and the hydraulic jack, a mechanical sensor is arranged between the hydraulic jack and the right panel of the device, and the mechanical sensor is fixed to the right panel.
6. The apparatus for double-lamella shear test of asphalt mixture according to claim 1, characterized in that, The upper and lower bottom plates are fixed by bolts to fix the whole device.
7. The apparatus for double-lamella shear test of asphalt mixture according to claim 1, wherein the asphalt The mixture test piece is a circular pie-shaped asphalt mixture test piece arranged on the same axis as the guide rod, and the asphalt mixture test piece is provided with vertical support force by the clamp and horizontal constraint force by the left and right horizontal constraint steel plates; during the test, the left and right horizontal constraint steel plates are continuously approached by the hydraulic jack, thereby applying a horizontal pressure to the asphalt mixture test piece, and the mechanical sensor displays the horizontal pressure at this time; vertical pressure is applied to the upper half steel plate of the left clamp, and since the right clamp is fixed, the left clamp can move up and down, and the asphalt mixture test piece will be subjected to vertical shear failure.