CN111929177A - Device and method for detecting torsional shear strength between asphalt layers - Google Patents
Device and method for detecting torsional shear strength between asphalt layers Download PDFInfo
- Publication number
- CN111929177A CN111929177A CN202010780420.1A CN202010780420A CN111929177A CN 111929177 A CN111929177 A CN 111929177A CN 202010780420 A CN202010780420 A CN 202010780420A CN 111929177 A CN111929177 A CN 111929177A
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- shear strength
- asphalt
- torsional shear
- hand lever
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The embodiment of the invention relates to a device for detecting torsional shear strength between asphalt layers. The interlaminar torsional shear strength detection device comprises a grasper and a test wrench, wherein the grasper is used for grasping a core sample and promoting the core sample to rotate, and the test wrench is used for applying torsion to the grasper for grasping the core sample and measuring the magnitude of the applied torsion. Torsional shear strength detection device between bituminous paving layer can be in the field test bituminous paving layer torsional shear strength fast, and its light in weight removes the convenience, and need not the generator and provide the power, for promoting bituminous paving layer bonding strength test provide convenient condition to be favorable to bituminous paving quality control. The embodiment of the invention also relates to a method for detecting the torsional shear strength between asphalt layers.
Description
Technical Field
The invention relates to the technical field of material testing, in particular to an asphalt interlayer torsional shear strength detection device and a method for detecting asphalt interlayer torsional shear strength by using the asphalt interlayer torsional shear strength detection device.
Background
The quality of asphalt pavement in highway engineering is closely related to the service life of a highway, driving safety, driving comfort and the like, and the quality of asphalt pavement engineering is also highly valued by highway builders. At present, various performance indexes of the asphalt pavement are detected by various detection methods. For example, an interlayer bonding strength test method (T0985-2019) is added to the highway subgrade and pavement site test regulation (JTG3450-2019) which is implemented at 1 st 4.2020. The method mainly tests the interlayer bonding force of the asphalt pavement structure layer, including the pull strength and the torsional shear strength. If the bonding strength between the structural layers of the asphalt pavement is insufficient, the stress condition inside the pavement is greatly different from the design requirement, so that the pavement is easy to have quality problems of pushing, stripping, loosening and the like, and the service life of the pavement is shortened.
The method for testing interlayer bonding strength stipulates the basic requirements of the test, wherein the method for testing torsional shear strength mainly stipulates that a torsion bar needs to rotate 90 degrees within 30s +/-5 s during the test, detects and calculates the value of torque M, and then uses a formula
And calculating the interlayer torsional shear strength. The existing detection equipment is mainly used for detecting indoor test blocks, is heavy and needs an external power supply. If the device is used for field test, the device needs to be carried by trucks. And, in each point test, it is necessary to stick the twist-shear disk to the inspection position with epoxy. The epoxy resin needs several hours for curing, the detection period is very long, a large amount of detection work cannot be carried out, and the requirements of field test operation cannot be met.
Disclosure of Invention
In view of the above problems, the present invention is proposed to provide an apparatus and a method for detecting interlaminar torsional shear strength of asphalt, which overcome or at least partially solve the above problems.
In a first aspect, the invention provides a device for detecting torsional shear strength between asphalt layers.
Twist and cut intensity detection device between asphalt layer, its structure includes:
the grasper is used for grasping the core sample and promoting the core sample to rotate; the grasper comprises a positioning seat, a movable seat and at least two clamping pieces; the positioning seat is provided with a guide rod, the movable seat is sleeved on the guide rod and is enabled to be away from the positioning seat through an elastic piece arranged between the positioning seat and the movable seat; the clamping piece is hinged with the positioning seat and is movably connected with the movable seat through a connecting rod; when the movable seat approaches to the positioning seat, the clamping parts of the clamping pieces are urged to approach each other through the connecting rod; when the movable seat is far away from the positioning seat, the clamping parts of the clamping pieces are enabled to be far away from each other through the connecting rod; the outer peripheral wall of the guide rod is provided with an external thread, and the grasper further comprises a rotating piece which is provided with an internal thread matched with the external thread; when the rotating piece approaches to the positioning seat, the rotating piece can abut against the movable seat and urge the movable seat to approach to the positioning seat;
a test wrench for applying a torque to the external thread of the grasper grasping the core sample and measuring the magnitude of the applied torque; the test wrench comprises a hand lever and a dowel bar, wherein the dowel bar is hinged with the hand lever, and an opening which can be clamped or sleeved with the rotating piece is formed at the position, close to the hinge, of the dowel bar; the test wrench further comprises a pressure sensor, wherein the pressure sensor is arranged between the hand lever and the dowel bar and used for transmitting the acting force applied to the hand lever to the dowel bar and measuring the transmitted acting force.
Optionally, the clips are arranged in an annular array.
Optionally, the inner side wall of the clamping part is arc-shaped, and the radius of the inner side wall is equal to that of the core sample.
Optionally, the elastic member is a compression spring sleeved on the guide rod.
Optionally, a gasket is disposed between the elastic member and the movable seat.
Optionally, the rotating member is a hexagon nut, and a gasket is arranged between the rotating member and the movable seat.
Optionally, the dowel bar comprises a main bar part and a connecting part which are perpendicular to each other, the opening is arranged at the joint of the main bar part and the connecting part, and the connecting part is hinged to the hand lever; the pressure sensor is arranged between the hand lever and the main lever part, the axis of the hand lever rotating relative to the dowel bar is parallel to the center line of the opening, and the plane of the hand lever and the center line of the main lever part are perpendicular.
Optionally, the test wrench further includes a spring having two ends respectively connected to the handle bar and the dowel bar, and the spring is used to limit a maximum opening angle between the handle bar and the dowel bar.
Optionally, the test wrench further comprises a calculating unit and a display unit, wherein the calculating unit is used for receiving the pressure information collected by the pressure sensor, processing the pressure information, and sending a processing result to the display unit.
In a second aspect, the present invention provides a method for detecting an inter-asphalt-layer torsional shear strength by using the apparatus for detecting an inter-asphalt-layer torsional shear strength according to the first aspect.
The method comprises the following steps:
drilling a core at the selected test position by using a core drilling machine until the core is below the bonding surface of the two asphalt layers to be tested, and removing the core drilling machine;
adjusting the rotating piece to enable the clamping part of the clamping piece to be parallel to the guide rod, and inserting the clamping part into a gap between the core sample and the peripheral pavement;
clamping or sleeving the opening of the dowel bar with the rotating piece, pulling the hand lever to rotate the rotating piece, so that the movable seat is close to the fixed seat, and the clamping part clamps the core sample;
continuously pulling the hand lever to enable the bonding surface between the asphalt layers to generate shear deformation until the bonding surface is completely damaged; and reading the maximum torsion value, measuring the diameter of the core sample, and calculating the torsional shear strength between the asphalt layers.
The invention has the following beneficial effects:
the device for detecting the torsional shear strength between the asphalt layers can rapidly test the torsional shear strength between the asphalt layers in the field, is light in weight and convenient to move, does not need a power supply provided by a generator, and provides convenient conditions for popularizing the test of the bonding strength between the asphalt layers, thereby being beneficial to the quality control of the asphalt pavement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic structural diagram of a grasper in an embodiment of the device for detecting torsional shear strength between asphalt layers according to the present invention;
FIG. 2 is a schematic view of the connection between the positioning seat and the clamping member in FIG. 1;
FIG. 3 is a schematic view of the movable seat and the connecting rod in FIG. 1;
FIG. 4 is a schematic structural diagram of a test wrench in an embodiment of the device for detecting torsional shear strength between asphalt layers according to the present invention;
FIG. 5 is an example of an image displayed by the display unit of FIG. 4 during testing.
Description of reference numerals: 1. positioning seats; 2. a movable seat; 3. a clamping member; 4. an upper disc portion; 5. a reinforcing portion; 6. a guide bar; 7. an elastic member; 8. a connecting rod; 9. a clamping portion; 10. a rotating member; 11. a gasket; 12. a handle; 13. a dowel bar; 14. an opening; 15. a pressure sensor; 16. a main rod portion; 17. a connecting portion; 18. a micro industrial computer; 19. a spring.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 4, an exemplary embodiment of an asphalt pavement torsional shear strength detection apparatus according to the present invention is shown. The device for detecting the torsional shear strength between the asphalt layers comprises a grasper and a test wrench.
Referring first to fig. 1, the grasper comprises a positioning seat 1, a movable seat 2, at least two clamping members 3. The positioning seat 1 is composed of an upper disk part 4 and a reinforcing part 5 formed by extending the middle part of the upper disk part 4 downwards, and an upright guide rod 6 is fixed at the center of the upper disk part 4. The movable seat 2 is provided with a hole at the center, sleeved on the guide rod 6, and urged to be away from the positioning seat 1 through an elastic member 7 arranged between the positioning seat 1 and the movable seat 2, such as a compression spring sleeved on the guide rod 6. The clamping piece 3 is hinged to the positioning seat 1, and specifically, the middle of the clamping piece 3 is hinged to the outer periphery of the positioning seat 1. The holder 3 through connecting rod 8 with sliding seat 2 swing joint, it is specific, the one end of connecting rod 8 with the upper portion of holder 3 is articulated, the other end of connecting rod 8 with the outer peripheral edges of sliding seat 2 are articulated. When the movable seat 2 approaches to the positioning seat 1, the connecting rod 8 urges the clamping parts 9 of the clamping pieces 3 to approach each other; when the movable seat 2 is far away from the positioning seat 1, the connecting rod 8 urges the clamping parts 9 of the clamping pieces 3 to be far away from each other.
In this embodiment, the number of the clamping members 3 is 8, and the clamping members are distributed in an annular array. The inside wall of clamping part 9 is the arc, and its radius equals with the radius of core appearance, can increase on the one hand with core appearance area of contact, on the other hand increases anti bending capability, holder 3 is difficult to take place to warp when clinching core appearance. It should be understood that the number of said clamps 3 may also be 2, 3, 4, 5, etc. or other suitable number.
The outer peripheral wall of the upper portion of the guide bar 6 forms an external thread, and the grasper further includes a rotary member 10, the rotary member 10 forming an internal thread to be fitted with the external thread. When the rotating member 10 approaches the positioning seat 1, if it rotates clockwise, it can abut against the movable seat 2 and urge the movable seat 2 to approach the positioning seat 1. When the rotating member 10 moves away from the positioning seat 1, for example, rotates counterclockwise, the movable seat 2 moves away from the positioning seat 1 under the action of the elastic member 7. Thus, by operating the rotary 10, the opening and closing of the grasper can be achieved.
In this embodiment, the rotating member 10 is a hexagonal nut with a fastening torque greater than 350Nm, and the spacers 11 are disposed between the rotating member 10 and the movable seat 2 and between the elastic member 7 and the movable seat 2. It should be understood that the rotary member 10 may also be of other suitable configurations, not listed here.
Referring now to fig. 4, the test wrench comprises a hand lever 12, a dowel 13, the dowel 13 being hinged to the hand lever 12. The dowel bar 13 forms an opening 14 near the hinge joint, which can be clamped or sleeved with the rotating element 10. The test wrench further comprises a pressure sensor 15, wherein the pressure sensor 15 is arranged between the hand lever 12 and the dowel bar 13, when acting force is applied to the hand lever 12, the acting force can be transmitted to the dowel bar 13 through the pressure sensor 15, and meanwhile, the pressure sensor 15 can also measure the magnitude of the transmitted acting force. Thus, when the test wrench is used to rotate the rotary member 10, the amount of torque applied to the rotary member 10 can be measured or calculated.
Specifically, the dowel bar 13 includes a main bar portion 16 and a connecting portion 17 perpendicular to each other. The opening 14 is adapted to the rotary member 10, is a hexagonal opening, and is disposed at the junction of the main rod portion 16 and the connecting portion 17. The connecting portion 17 is hinged to the handle 12. The pressure sensor 15 is arranged between the hand lever 12 and the main lever part 16, preferably at a distance of 70cm from the opening 14. The axis of rotation of the hand lever 12 relative to the dowel 13 is parallel to the centerline of the opening 14 and both are perpendicular to the centerline of the main lever portion 16 in the plane.
In this embodiment, the test wrench further includes a calculating unit and a display unit, wherein the calculating unit is configured to receive the pressure information collected by the pressure sensor 15, process the pressure information, and send a processing result to the display unit. Specifically, the test wrench comprises a micro industrial computer 18, the micro industrial computer 18 is fixedly mounted on the hand lever 12, and the computing unit and the display unit are integrated on the micro industrial computer 18. The micro industrial computer 18 is connected with the pressure sensor 15 through a data line.
The test wrench further comprises a spring 19, two ends of which are respectively connected with the hand lever 12 and the dowel bar 13. Specifically, the two ends of the spring 19 are respectively connected to the hand lever 12 and the main lever portion 16, and the spring 19 is located near the pressure sensor 15, so as to limit the maximum opening 14 angle between the hand lever 12 and the dowel bar 13, and prevent the data line and the pressure sensor 15 from being damaged due to the overlarge opening 14 between the hand lever 12 and the dowel bar 13.
The method for detecting the torsional shear strength between asphalt layers by using the torsional shear strength detection device between asphalt layers in the embodiment comprises the following steps:
1) and drilling the core at the selected test position by adopting a core drilling machine with a drilling barrel with the diameter of 100mm, drilling to the position below the bonding surface of the two asphalt layers to be tested, removing the core drilling machine, and keeping the core sample in a bonding state with the lower bearing layer without taking out.
2) And adjusting the rotating piece 10 to enable the clamping part 9 of the clamping piece 3 to be parallel to the guide rod 6, and inserting the clamping part 9 into a gap between the core sample and the peripheral road surface to clamp the core sample.
3) And sleeving the opening 14 of the dowel bar 13 on the rotating piece 10, and pulling the hand lever 12 clockwise to rotate the rotating piece 10, so that the movable seat 2 is driven to approach the fixed seat, and the clamping part 9 clamps the core sample.
4) Continuously pulling the handspike 12 to enable the bonding surface between the asphalt layers to generate shearing deformation until the bonding surface is completely damaged; and reading the maximum torsion value, measuring the diameter of the core sample, and calculating the torsional shear strength between the asphalt layers.
In this embodiment, the micro industrial computer 18 acquires the value of the pressure sensor 15 1 time every 0.1 second, and after the set pressure value reaches 15N, it determines that the grasper reaches the clamping state and starts timing. Since the test specification requires that the torsion bar should be rotated 90 ° within 30s ± 5s, the micro industrial computer 18 displays the fan-shaped image as shown in fig. 5 in addition to the real-time test torque, the current maximum torque, and the test seconds by using a numerical method. One side of the sector, namely the part marked as the 'hand lever position' in the figure, is kept unchanged, the central angle of the sector is increased by 3 degrees every second, namely the 'original position' of the sector in the figure is changed, and because the hand lever 12 actually rotates during testing, a tester can keep the direction of the 'original position' in the figure unchanged from the direction when starting timing, and can keep the torsion bar rotating speed required by the specification.
The device for detecting the torsional shear strength between the asphalt layers can rapidly test the torsional shear strength between the asphalt layers in the field, is light in weight and convenient to move, does not need a power supply provided by a generator, and provides convenient conditions for popularizing the test of the bonding strength between the asphalt layers, thereby being beneficial to the quality control of the asphalt pavement.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a twist-cut intensity detection device between asphalt layer which characterized in that includes:
the grasper is used for grasping the core sample and promoting the core sample to rotate; the grasper comprises a positioning seat, a movable seat and at least two clamping pieces; the positioning seat is provided with a guide rod, the movable seat is sleeved on the guide rod and is enabled to be away from the positioning seat through an elastic piece arranged between the positioning seat and the movable seat; the clamping piece is hinged with the positioning seat and is movably connected with the movable seat through a connecting rod; when the movable seat approaches to the positioning seat, the clamping parts of the clamping pieces are urged to approach each other through the connecting rod; when the movable seat is far away from the positioning seat, the clamping parts of the clamping pieces are enabled to be far away from each other through the connecting rod; the outer peripheral wall of the guide rod is provided with an external thread, and the grasper further comprises a rotating piece which is provided with an internal thread matched with the external thread; when the rotating piece approaches to the positioning seat, the rotating piece can abut against the movable seat and urge the movable seat to approach to the positioning seat;
a test wrench for applying a torque to the external thread of the grasper grasping the core sample and measuring the magnitude of the applied torque; the test wrench comprises a hand lever and a dowel bar, wherein the dowel bar is hinged with the hand lever, and an opening which can be clamped or sleeved with the rotating piece is formed at the position, close to the hinge, of the dowel bar; the test wrench further comprises a pressure sensor, wherein the pressure sensor is arranged between the hand lever and the dowel bar and used for transmitting the acting force applied to the hand lever to the dowel bar and measuring the transmitted acting force.
2. The asphalt interlaminar torsional shear strength detection device according to claim 1, characterized in that: the clips are arranged in an annular array.
3. The asphalt interlaminar torsional shear strength detection device according to claim 1, characterized in that: the inside wall of clamping part is the arc, and its radius is equal with the radius of core appearance.
4. The asphalt interlaminar torsional shear strength detection device according to claim 1, characterized in that: the elastic piece is a compression spring sleeved on the guide rod.
5. The interlaminar torsional shear strength detection device of claim 4, characterized in that: and a gasket is arranged between the elastic piece and the movable seat.
6. The asphalt interlaminar torsional shear strength detection device according to claim 1, characterized in that: the rotating piece is a hexagon nut, and a gasket is arranged between the rotating piece and the movable seat.
7. The asphalt interlaminar torsional shear strength detection device according to claim 1, characterized in that: the dowel bar comprises a main bar part and a connecting part which are perpendicular to each other, the opening is formed at the joint of the main bar part and the connecting part, and the connecting part is hinged with the hand lever; the pressure sensor is arranged between the hand lever and the main lever part, the axis of the hand lever rotating relative to the dowel bar is parallel to the center line of the opening, and the plane of the hand lever and the center line of the main lever part are perpendicular.
8. The asphalt interlaminar torsional shear strength detection device according to claim 1, characterized in that: the test wrench also comprises a spring, two ends of the spring are respectively connected with the hand lever and the dowel bar, and the spring is used for limiting the maximum opening angle between the hand lever and the dowel bar.
9. The device for detecting interlaminar torsional shear strength of asphalt as claimed in any one of claims 1 to 8, wherein: the test wrench also comprises a calculation unit and a display unit, wherein the calculation unit is used for receiving the pressure information collected by the pressure sensor, processing the pressure information and sending the processing result to the display unit.
10. A method for detecting the torsional shear strength between asphalt layers by using the torsional shear strength detecting device between asphalt layers as claimed in any one of claims 1 to 9, comprising the following steps:
drilling a core at the selected test position by using a core drilling machine until the core is below the bonding surface of the two asphalt layers to be tested, and removing the core drilling machine;
adjusting the rotating piece to enable the clamping part of the clamping piece to be parallel to the guide rod, and inserting the clamping part into a gap between the core sample and the peripheral pavement;
clamping or sleeving the opening of the dowel bar with the rotating piece, pulling the hand lever to rotate the rotating piece, so that the movable seat is close to the fixed seat, and the clamping part clamps the core sample;
continuously pulling the hand lever to enable the bonding surface between the asphalt layers to generate shear deformation until the bonding surface is completely damaged; and reading the maximum torsion value, measuring the diameter of the core sample, and calculating the torsional shear strength between the asphalt layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010780420.1A CN111929177A (en) | 2020-08-04 | 2020-08-04 | Device and method for detecting torsional shear strength between asphalt layers |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010780420.1A CN111929177A (en) | 2020-08-04 | 2020-08-04 | Device and method for detecting torsional shear strength between asphalt layers |
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| CN111929177A true CN111929177A (en) | 2020-11-13 |
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| CN202010780420.1A Pending CN111929177A (en) | 2020-08-04 | 2020-08-04 | Device and method for detecting torsional shear strength between asphalt layers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279867A (en) * | 2021-12-14 | 2022-04-05 | 山西省交通科技研发有限公司 | Method for measuring interlayer shear strength of asphalt mixture |
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2020
- 2020-08-04 CN CN202010780420.1A patent/CN111929177A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279867A (en) * | 2021-12-14 | 2022-04-05 | 山西省交通科技研发有限公司 | Method for measuring interlayer shear strength of asphalt mixture |
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