A device for testing the oblique shear strength of a pavement interlayer bonding material

Abstract

The utility model discloses a kind of anti-diagonal shear strength testing devices of pavement interlayer bonding material, it is related to pavement detection technical field, including press, first base, second base, first fixed seat and second fixed seat, first base is provided with a plurality of first fixed grooves of different inclination angles, the below of first fixed seat is fixedly provided with first fixed block, second base is provided with a plurality of second fixed grooves of different inclination angles, second fixed seat is fixedly connected with the output end of press, second fixed block can be clamped into second fixed groove, first fixed seat is provided with containing groove, the opening of containing groove is obliquely upward, and there is exposed portion after placing sample to be measured into containing groove, second fixed seat can be in contact with the exposed portion of sample to be measured and exert pressure, and second fixed seat can press the exposed portion of sample to be measured and move obliquely downward. The utility model can simulate diagonal shear force in the complex stress of pavement, and can simulate diagonal shear force under different angle conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to road surface detection technical field especially relates to a road surface interlayer bonding material anti oblique shear strength testing device. BACKGROUND

[0002] In highway engineering, the stability and durability of pavement structure are directly related to the service life and operation safety of highway. However, due to the insufficient bonding quality between pavement layers, early diseases such as interlayer void, crack, peeling and other problems may occur in pavement structure. Therefore, high-quality interlayer bonding can not only improve the shear strength and overall stiffness of pavement, but also ensure the service life of pavement. In the process of using road, the bonding layer material between base layer and surface layer and between surface layers is under complex stress, including compression stress, tensile stress and shear stress, especially the shear stress can be divided into normal shear stress and oblique shear stress. In the process of interlayer bonding strength test, since the press machine can only provide horizontal and vertical force, the traditional interlayer bonding strength testing device can only test the interlayer compression stress, tensile stress and normal shear stress, which can barely meet the partial stress working condition of interlayer bonding material, and the different angle oblique shear force of interlayer bonding material cannot be tested. Therefore, there is an urgent need for a road surface interlayer bonding material anti oblique shear strength testing device to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at providing a road surface interlayer bonding material anti oblique shear strength testing device to solve the above technical problems, which can simulate the oblique shear force in the complex stress of pavement and simulate the oblique shear force under different angle conditions.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] The utility model provides a kind of road surface interlayer bonding material anti oblique shear strength testing device, including press, first base, second base, first fixed seat and second fixed seat, the first base and the second base are located below the output end of the press, a plurality of first fixed grooves with different inclination angles are provided on the first base, first fixed block is fixedly arranged below the first fixed seat, the first fixed block can be inserted into the first fixed groove, a plurality of second fixed grooves with different inclination angles are provided on the second base, the second fixed seat is fixedly connected with the output end of the press, second fixed block is fixedly arranged on the top of the second fixed seat, the second fixed block can be inserted into the second fixed groove, the first fixed seat is provided with accommodating groove, the opening of the accommodating groove is obliquely upward, the accommodating groove is used to accommodate sample to be measured, and after the sample to be measured is placed into the accommodating groove, there is exposed part, the second fixed seat can be in contact with the exposed part of the sample to be measured and apply pressure, and the second fixed seat can compress the exposed part of the sample to be measured and move obliquely downward.

[0006] In some embodiments, the first fixed groove is a dovetail groove, the first fixed block is a dovetail tenon or the first fixed groove is a T-shaped groove, and the first fixed block is a T-shaped block.

[0007] In some embodiments, the second fixed groove is a dovetail groove, the second fixed block is a dovetail tenon or the second fixed groove is a T-shaped groove, and the second fixed block is a T-shaped block.

[0008] In some embodiments, an observation window is further included, which is fixedly arranged on the side of the first fixed seat and communicates with the accommodating groove.

[0009] In some embodiments, the accommodating groove is a cylindrical groove or a cuboid groove.

[0010] In some embodiments, the second fixed seat includes a first pressing plate and a second pressing plate, the first pressing plate is fixedly connected with the second pressing plate, the second fixed block is arranged on the first pressing plate, and the second pressing plate is used to contact the exposed part of the sample to be measured.

[0011] In some embodiments, the second pressing plate is an arc-shaped plate or a straight plate, when the accommodating groove is a cylindrical groove, the second pressing plate is an arc-shaped plate, and when the accommodating groove is a cuboid groove, the second pressing plate is a straight plate.

[0012] In some embodiments, the first fixed groove is a T-shaped groove, the first fixed block is a T-shaped block, the second fixed groove is a T-shaped groove, and the second fixed block is a T-shaped block.

[0013] In some embodiments, the first fixed groove of each inclination angle has a second fixed groove corresponding to the inclination angle, and the line connecting the first fixed groove and the second fixed groove of the same inclination angle is arranged obliquely relative to the horizontal plane.

[0014] In some embodiments, the output end of the press machine moves in a direction perpendicular to the horizontal plane, and the first base and the second base are arranged in parallel.

[0015] The utility model discloses relative to prior art has obtained following technical effect:

[0016] The road surface interlayer bonding material anti-oblique shear strength testing device provided by the utility model forces the exposed part of the sample to move obliquely downwards by the design that the second fixed seat is in contact with the exposed part of the sample to be measured and exerts pressure, directly simulates the oblique shear force that the road surface interlayer bonding material actually bears, avoids the problem that the traditional vertical shear test or horizontal shear test is disconnected with actual stress, makes the test result more reflect the shear resistance of the material in the real road surface environment, and provides a more accurate basis for road surface design and material selection. The first fixed groove of the first base has a plurality of inclination angles, the first fixed block can be clamped into different groove positions to adjust the inclination reference angle of the first fixed seat (and the sample to be measured in the containing groove), the second fixed groove of the second base has a plurality of inclination angles, the second fixed block can be clamped into different groove positions to adjust the oblique pressure angle of the second fixed seat (the pressure exerting end), the two can cover the common oblique shear angle range of the road surface, meet the test requirements under different working conditions, do not need to replace the whole device, improve the applicable scene and reusability, can simulate the oblique shear force in the complex stress of the road surface, and can simulate the oblique shear force under different angle conditions. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0018] Figure 1 It is the use schematic drawing of the road surface interlayer bonding material anti-oblique shear strength testing device in some embodiments of the utility model.

[0019] Figure 2 It is the connection schematic drawing of the first base, the first fixed seat, the second base and the second fixed seat in some embodiments of the utility model.

[0020] Figure 3 It is the structure schematic drawing of the first base in some embodiments of the utility model.

[0021] Figure 4Structure diagram of the second base in some embodiments of the utility model;

[0022] Figure 5 Structure diagram of the first fixed seat of the cylindrical groove in some embodiments of the utility model;

[0023] Figure 6 Structure diagram of the first fixed seat in some embodiments of the utility model;

[0024] Figure 7 Structure diagram of the first fixed seat filled with the sample to be tested in some embodiments of the utility model;

[0025] Figure 8 Structure diagram of the guide plate arranged on the second pressing plate in some embodiments of the utility model.

[0026] In the drawing: 101-sample to be tested;102-computer control system;103-supporting base;104-fixed support;1-press;2-first base;21-first fixed groove;3-first fixed seat;31-containing groove;4-second base;41-second fixed groove;5-second fixed seat;51-first pressing plate;52-second pressing plate;6-observation window. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] The utility model discloses a kind of interlayer bonding material antioblique shear strength testing devices, to solve the problems existing in prior art, can simulate the oblique shear force in the complex stress of pavement, and can simulate the oblique shear force under different angle conditions.

[0029] To make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is further described in detail below with reference to the drawings and specific embodiments.

[0030] As Figures 1-8The utility model provides a kind of anti-oblique shear strength testing device of interlayer bonding material of road surface, including press 1, first base 2, second base 4, first fixed seat 3 and second fixed seat 5, first base 2 and second base 4 are all located below the output end of press 1, first base 2 is provided with multiple first fixed grooves 21 of different inclination angles, first fixed block is fixedly arranged below first fixed seat 3, first fixed block can be clamped into first fixed groove 21, second base 4 is provided with multiple second fixed grooves 41 of different inclination angles, second fixed seat 5 is fixedly connected with the output end of press 1, second fixed block is fixedly arranged on the top of second fixed seat 5, second fixed block can be clamped into second fixed groove 41, first fixed seat 3 is provided with accommodating groove 31, the opening of accommodating groove 31 is obliquely upward, accommodating groove 31 is used to accommodate sample 101 to be measured, and after sample 101 to be measured is placed into accommodating groove 31, there is exposed portion, second fixed seat 5 can be in contact with the exposed portion of sample 101 to be measured and apply pressure, and second fixed seat 5 can press the exposed portion of sample 101 to be measured and move obliquely downward. By the design that second fixed seat 5 is in contact with the exposed portion of sample 101 to be measured and apply pressure, the exposed portion of sample is forced to move obliquely downward, directly simulates the oblique shear force that interlayer bonding material of road surface actually bears, avoids the problem that traditional vertical shear test or horizontal shear test is disconnected with actual stress, so that test result can reflect the shear resistance of material in real road environment more, provides more accurate basis for road design and material selection. The multiple first fixed grooves 21 of different inclination angles of first base 2 can be clamped into different groove positions by first fixed block, to adjust the inclination reference angle of first fixed seat 3 (and sample 101 to be measured in accommodating groove 31);The multiple second fixed grooves 41 of different inclination angles of second base 4 can be clamped into different groove positions by second fixed block, to adjust the inclination pressure angle of second fixed seat 5 (pressure end);The two can cover the oblique shear angle range commonly seen in road surface, meet the test needs under different working conditions, without replacing the whole device, improve applicable scenarios and reusability, can simulate the oblique shear force in complex stress of road surface, and can simulate the oblique shear force under different angle conditions.

[0031] It should be noted that it also includes support base 103, fixed support 104 and computer control system 102, fixed support 104 is fixedly arranged above support base 103, first base 2 is fixedly arranged on support base 103, press 1 is fixedly arranged on fixed support 104, and the output end of press 1 is arranged through fixed support 104, first base 2, second base 4, first fixed seat 3 and second fixed seat 5 are all located in fixed support 104, press 1 is electrically connected with computer control system 102, computer control system 102 can control the size of pressure applied by press 1.

[0032] In some embodiments, the first fixing groove 21 is a dovetail groove and the first fixing block is a dovetail tenon, or the first fixing groove 21 is a T-groove and the first fixing block is a T-block; the second fixing groove 41 is a dovetail groove and the second fixing block is a dovetail tenon, or the second fixing groove 41 is a T-groove and the second fixing block is a T-block. The trapezoidal inner wall of the dovetail groove fits against the trapezoidal outer wall of the dovetail tenon, thereby limiting the fixing seat and ensuring that the fixing seat maintains a preset angle throughout the entire pressure application process without displacement. The groove of the T-groove and the flange of the T-block interlock, effectively limiting the fixing block from detaching from the groove body, and also preventing the fixing seat from shifting or loosening under oblique shear pressure. Preferably, the first fixing groove 21 is a T-groove, the first fixing block is a T-block, the second fixing groove 41 is a T-groove, and the second fixing block is a T-block.

[0033] In some embodiments, the pavement interlayer bond material anti-diagonal shear strength testing device further includes an observation window 6, which is fixedly disposed on the side of the first fixing base 3 and communicates with the receiving groove 31. During testing, the operator can observe the interlayer bond surface state of the sample 101 to be tested in the receiving groove 31 in real time through the transparent observation window 6.

[0034] In some embodiments, the receiving groove 31 is a cylindrical groove or a cuboid groove. The cylindrical groove is suitable for samples with a circular cross-section, while the cuboid groove is suitable for samples with a rectangular shape. The circular inner wall of the cylindrical groove and the outer wall of the circular sample can achieve full circumferential contact, ensuring the detection effect. The cuboid groove is more suitable for real-world applications. Road surfaces are generally rectangular cross-section layered structures, and the cuboid groove can accommodate cuboid samples similar to the actual road surface structure. Its bonding surface is a rectangular plane, which is similar in shape and stress state to the bonding surface between layers of the actual road surface, resulting in better simulation.

[0035] In some embodiments, the second fixing base 5 includes a first pressure plate 51 and a second pressure plate 52. The first pressure plate 51 and the second pressure plate 52 are fixedly connected. A second fixing block is provided on the first pressure plate 51, and the second pressure plate 52 is used to abut against the exposed part of the sample 101 to be tested. The tilt angle can be adjusted (to adapt to different shear angle requirements) by the cooperation of the second fixing block of the first pressure plate 51 with the second fixing groove 41 of the second base 4; the second pressure plate 52 applies stable pressure to the sample to achieve precise pressure application. The functions of the first pressure plate 51 and the second pressure plate 52 are separated to avoid mutual interference.

[0036] In some embodiments, the second pressure plate 52 is an arc-shaped plate or a straight plate. When the receiving groove 31 is a cylindrical groove, the second pressure plate 52 is an arc-shaped plate. To facilitate separation from the sample 101 to be tested, the angle of the central angle is generally less than or equal to 180°. When the receiving groove 31 is a cuboid groove, the second pressure plate 52 is a straight plate. When the receiving groove 31 is a cylindrical groove, the sample 101 to be tested is cylindrical, and the outer surface of its exposed portion is an arc-shaped curved surface. In this case, the second pressure plate 52 is designed as an arc-shaped plate with the curvature of the sample's arc surface, which can achieve complete contact between the inner arc surface and the outer arc surface of the sample, ensuring uniform distribution of applied pressure and preventing displacement. When the receiving groove 31 is a cuboid groove, the sample 101 to be tested is a cuboid, and the upper surface of its exposed portion is a plane. At this time, the second pressure plate 52 is designed as a flat straight plate, which can achieve complete contact between the lower surface of the straight plate and the sample plane. The contact surface is a complete rectangular plane without any protrusions or depressions. This avoids the problem of the middle being suspended and only the four sides contacting when pressing the flat sample with an arc plate. It can also ensure the uniform distribution of the applied pressure and is not prone to displacement.

[0037] As a preferred embodiment, in order to reduce the possibility of slippage, guide plates 53 can be added to the second pressure plate 52. There are two guide plates, which are symmetrically fixed on the front and rear sides of the second pressure plate 52 (without affecting the oblique pressure sliding of the test sample). During the test, the guide plates 53 are located on both sides of the sample and can limit the test sample to prevent it from deviating from the pre-pressure track.

[0038] In some embodiments, each first fixing groove 21 with a tilt angle has a corresponding second fixing groove 41 with a tilt angle, and the line connecting the first fixing groove 21 and the second fixing groove 41 with the same tilt angle is inclined relative to the horizontal plane. Under the same shear angle, the tilt angle of the first fixing groove 21 (which determines the reference angle of the sample bonding surface) is consistent with the tilt angle of the second fixing groove 41 (which determines the pressure angle of the second fixing seat 5), ensuring that the pressure direction matches the force angle of the sample bonding surface in the same frequency. The line connecting the two is inclined to the horizontal plane, and the tilt angle is equal to the preset shear angle. The force applied by the press 1 through the second fixing seat 5 will be transmitted to the sample bonding surface in a straight line along this inclined line, directly forming a shear force along the preset angle, rather than the superposition of vertical or horizontal forces, accurately simulating the real shear force between road layers at a specific angle.

[0039] In some embodiments, the output end of the press 1 moves in a direction perpendicular to the horizontal plane, and the first base 2 and the second base 4 are arranged in parallel. The parallel arrangement of the first base 2 and the second base 4 ensures that their horizontal references are completely consistent. Consequently, the tilt angle of the first fixing groove 21 (sample reference angle) and the tilt angle of the second fixing groove 41 (pressure direction angle) are both referenced to the parallel bases, ensuring that under the same preset angle, the tilt direction of the sample bonding surface is completely aligned with the tilt direction of the pressure direction (without reference deviation).

[0040] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation mode and application range. In conclusion, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A device for testing the oblique shear strength of interlayer bonding materials for road surfaces, characterized in that: The device includes a press, a first base, a second base, a first fixing seat, and a second fixing seat. Both the first and second bases are located below the output end of the press. The first base has multiple first fixing slots with different inclination angles. A first fixing block is fixedly installed below the first fixing seat, and the first fixing block can be engaged in the first fixing slot. The second base has multiple second fixing slots with different inclination angles. The second fixing seat is fixedly connected to the output end of the press. A second fixing block is fixedly installed on the top of the second fixing seat, and the second fixing block can be engaged in the second fixing slot. The first fixing seat has a receiving groove with an upward-sloping opening. The receiving groove is used to receive the sample to be tested, and the sample to be tested has an exposed portion after being placed in the receiving groove. The second fixing seat can abut against the exposed portion of the sample to be tested and apply pressure, and the second fixing seat can force the exposed portion of the sample to move downwards at an angle.

2. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 1, characterized in that: The first fixing groove is a dovetail groove, and the first fixing block is a dovetail tenon; or the first fixing groove is a T-groove, and the first fixing block is a T-block.

3. The pavement interlayer bond material oblique shear strength testing device according to claim 2, characterized in that: The second fixing groove is a dovetail groove, and the second fixing block is a dovetail tenon; or the second fixing groove is a T-groove, and the second fixing block is a T-block.

4. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 1, characterized in that: It also includes an observation window, which is fixedly disposed on the side of the first fixing seat and communicates with the receiving groove.

5. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 1, characterized in that: The receiving groove is a cylindrical groove or a cuboid groove.

6. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 5, characterized in that: The second fixing base includes a first pressure plate and a second pressure plate. The first pressure plate is fixedly connected to the second pressure plate. The first pressure plate is provided with a second fixing block. The second pressure plate is used to abut against the exposed part of the sample to be tested.

7. The pavement interlayer bond material oblique shear strength testing device according to claim 6, characterized in that: The second pressure plate is an arc-shaped plate or a straight plate. When the receiving groove is a cylindrical groove, the second pressure plate is an arc-shaped plate. When the receiving groove is a cuboid groove, the second pressure plate is a straight plate.

8. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 3, characterized in that: The first fixing groove is a T-shaped groove, the first fixing block is a T-shaped block, the second fixing groove is a T-shaped groove, and the second fixing block is a T-shaped block.

9. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 1, characterized in that: Each first fixing slot with a tilt angle has a second fixing slot with a corresponding tilt angle, and the line connecting the first fixing slot and the second fixing slot with the same tilt angle is inclined relative to the horizontal plane.

10. The test device for the oblique shear strength of interlayer bonding materials for road surfaces according to claim 1, characterized in that: The output end of the press moves in a direction perpendicular to the horizontal plane, and the first base and the second base are arranged in parallel.

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