WO2021135162A1 - Dispositif d'essai de résistance au cisaillement du type à poussée au sol et procédé de mesure associé - Google Patents

Dispositif d'essai de résistance au cisaillement du type à poussée au sol et procédé de mesure associé Download PDF

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Publication number
WO2021135162A1
WO2021135162A1 PCT/CN2020/102443 CN2020102443W WO2021135162A1 WO 2021135162 A1 WO2021135162 A1 WO 2021135162A1 CN 2020102443 W CN2020102443 W CN 2020102443W WO 2021135162 A1 WO2021135162 A1 WO 2021135162A1
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WIPO (PCT)
Prior art keywords
test piece
shear strength
ground
indenter
test device
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PCT/CN2020/102443
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English (en)
Chinese (zh)
Inventor
金光来
周文
翟金陵
周明伟
杨福猛
Original Assignee
江苏中路工程技术研究院有限公司
江苏中路交通科学技术有限公司
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Publication of WO2021135162A1 publication Critical patent/WO2021135162A1/fr

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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
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
    • G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/36—Embedding or analogous mounting of samples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/38—Diluting, dispersing or mixing samples
    • 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
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/36—Embedding or analogous mounting of samples
    • G01N2001/366—Moulds; Demoulding
    • 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
    • G01N2203/0025—Shearing

Definitions

  • the invention relates to the technical field of pavement structure performance testing, in particular to a ground-pushing shear strength test device and a test method thereof.
  • Asphalt pavement is the main form of road surface in my country. Due to the continuous increase in traffic volume and axle load, as well as various reasons such as asphalt pavement structure design and construction management, many new and reconstructed asphalt pavements in my country have produced different types of diseases.
  • the performance of the shear failure between the new pavement layers is particularly prominent, and the shear failure of the splicing part of the new and old pavement of the expanded road is particularly prominent. Therefore, it is particularly important to evaluate the shear resistance of the materials between the asphalt pavements of newly-built roads and the splicing parts of new and old roads on extended roads.
  • testing equipment for the shear strength evaluation of the interlayer material of the newly built road, such as oblique shear, direct shear and torsion shear, but the equipment is prone to bending deformation of the fixture during the actual experiment process; and most of the shearing equipment is not With its own control system and force transmission loading system, most of them are just customized shearing fixtures, and then the fixtures are placed in the MTS similar to the testing machine (asphalt mixture dynamic stability loading equipment, etc.), there is no special loading for shearing equipment
  • the MTS loading force value and the actual force value of the test piece are not calibrated, the test results are not accurate, and the customized test piece fixture may not match the table of the MTS loading system, and the fixture is fixed
  • the problem of insufficient stability will also affect the test results. Generally, after several tests, the MTS indenter is bent or the specimen fixture is bent and deformed due to the unstable installation fixture, and the service life of the equipment is not long enough.
  • the main purpose of the present invention is to overcome the shortcomings of the existing shear strength test, and to provide a ground-based push-type shear strength test device, which improves the detection accuracy and is more suitable for practical use. At the same time, the present invention also claims protection A test method based on ground-push shear strength has the same technical effect and has industrial use value.
  • a ground-push type shear strength test device including a control acquisition system, a host, a fixture and a heating and heat preservation system;
  • the heating and heat preservation system is used to provide the required ambient temperature for the host, the clamp and the test piece fixed on the clamp;
  • the test piece has two parts connected by a plane, the clamp fixes the first part thereof, and the host applies a direction parallel to the plane on the other part of the test piece under the control of the control acquisition system ⁇ The force.
  • the host includes a transmission loading system, a tensile force sensor, a base, a beam and an indenter;
  • the transmission loading system is fixed on the machine base, the tension sensor is connected to the power output end of the transmission loading system and the cross beam, the indenter is fixed to the end of the cross beam, and the cross beam is at the end of the cross beam. Driven by the transmission loading system, it moves along a straight line, thereby applying force to a part of the test piece through the indenter.
  • the indenter is movably arranged up and down along the column.
  • the cross beam includes a hinge seat, a force receiving body and a sliding guide device
  • the hinge seat is hinged with one end of the tension sensor through a rotating shaft, the force receiving body fixes the hinge seat, and the bottom of the hinge seat is connected with the sliding guide device to realize linear movement.
  • the column includes a guide rod, a screw rod and a screw nut;
  • the guide rod is provided with a guide groove for partially covering the indenter, the screw nut is threadedly connected with the screw rod and is used to fix the indenter, and the screw rod is connected to the screw rod.
  • the length directions of the guide grooves are arranged in parallel, and during the rotation of the screw rod, the screw nut drives the indenter to move linearly along the guide groove.
  • the clamp includes two clamping plates for clamping both ends of the test piece, and the clamping plates are movably arranged and move along a straight line;
  • It also includes at least two supporting plates for supporting the periphery of the test piece and arranged at intervals, wherein at least one of the supporting plates is movably arranged and moves along the same straight line as the clamping plate.
  • the supporting part of the support plate for supporting the test piece includes at least one cushion structure that is adapted to the surface of the test piece, and the increase or decrease of the cushion structure is used to adapt to a variety of For the size of the test piece, each of the cushion structure and the main body of the support plate are connected by a pressure block.
  • the clamp includes two clamping blocks arranged symmetrically for covering the periphery of the test piece and in contact with the test piece, and the two clamping blocks are movably arranged and move along a straight line;
  • the end of the indenter is adapted to fit the outer shape of the test piece, and the side surface is fit to the side surface of one of the clamping blocks.
  • the heating and heat preservation system includes a power supply, a heating element, a temperature sensor and a heat preservation box;
  • the power supply realizes the on and off of the power supply and the control signal under the control of the control acquisition system
  • the heating element is used to realize the heating in the incubator
  • the temperature sensor senses the temperature and feeds it back to the The control acquisition system.
  • a ground-push type shear strength test method including the following steps:
  • the shear test of the present invention has different fixture forms, which can be used for the shear strength of test pieces in different situations, including the bonding material between the new and old road asphalt layers and the splicing material of the new and old pavement of the expanded road. It can be applied to the asphalt surface layer or
  • the water-stabilized base has a wide application range, breaking the limitation of the single practical range of traditional shearing equipment;
  • the shearing equipment contains an independent dedicated control acquisition system, which can be set with touch screen, printer and microcomputer, etc.
  • the device can independently complete the shearing test, and the sensor is accurate, the loading force value and the acquisition force value are calibrated, and the test result is accurate.
  • the main agent has a high matching degree with the fixture, and the fixture is easy to fix, avoiding bending and deformation of the fixture or the force transmission rod;
  • control acquisition system, host, fixture, and heating and heat preservation system can all be disassembled and assembled for easy handling.
  • the power supply can adopt vehicle-mounted wiring, which is suitable for on-site testing;
  • the present invention can test the shear strength in different temperature ranges, can simulate the actual environment of the road surface, and is beneficial to the actual shear strength of the reactive bonding material.
  • Fig. 1 is a schematic diagram of the structure of the ground-pushing shear strength test device at a first angle
  • Figure 2 is a schematic diagram of the structure of the ground-pushing shear strength test device at a second angle (rotated 90° clockwise);
  • Figure 3 is a partial enlarged view of A in Figure 1;
  • Figure 4 is a partial enlarged view at B in Figure 2;
  • Figure 5 is a schematic diagram of the structure of the column
  • Figure 6 is a schematic diagram of a structure of the fixture, on which a test piece is installed
  • FIG. 7 is a schematic diagram of the structure of the clamp in FIG. 6 after the test piece is removed;
  • Figure 8 is a front view of Figure 7;
  • Fig. 9 is a partial enlarged view of C in Fig. 7;
  • Figure 10 is a schematic diagram of the installation of the cushion structure
  • Figure 11 is a schematic diagram of another structure of the clamp.
  • Figure 12 is a schematic structural diagram of an indenter adapted to the clamp in Figure 11;
  • a ground-pushing shear strength test device includes a control acquisition system, a host, a fixture and a heating and heat preservation system; the heating and heat preservation system is used to provide the host, fixtures and test pieces fixed on the fixtures The required ambient temperature; the test piece has two parts connected by a plane, the first part of which is fixed by the clamp, and the host exerts a force parallel to the plane direction on the other part of the test piece under the control of the control acquisition system.
  • the invention can be used for the shear strength test of test pieces in different situations.
  • the test pieces can represent the bonding material between the new and old road asphalt layers and the splicing material of the new and old pavement of the expanded road.
  • the present invention can test the shear strength in different temperature ranges, can simulate the actual environment of the road surface, and is beneficial to the actual shear strength of the reactive bonding material.
  • the control acquisition system can be composed of touch screen, printer and microcomputer. It has stable loading and accurate measurement. It can set a variety of curve forms to choose, so as to quickly and accurately realize the digital calibration of load and elongation. It can set full load protection and position protection.
  • the test data can be accessed at will and the re-analysis of data and curves can be realized, including partial amplification and data re-editing, the test method is programmable, and can be stored or read, and the mechanical properties of the material can be automatically calculated.
  • the host includes a transmission loading system 1, a tension sensor 2, a frame 3, a beam 4, and a pressure head 5; the transmission loading system 1 is fixed on the frame 3, and the tension sensor 2 is connected to the power of the transmission loading system 1.
  • the output end and the beam 4, and the indenter 5 is fixed at the end of the beam 4, and the beam 4 moves in a straight line under the drive of the transmission loading system 1, so that the indenter 5 applies force to a part of the test piece.
  • the tensile force sensor 2 is used as the signal collection terminal, which can quantify the force exerted by the indenter on the test piece, so that the operator can confirm the current value of the shear force on the test piece, and the linear movement of the beam 4 The certainty of the direction of the force is guaranteed, and the deviation of the test results caused by the uncertainty of the force is avoided.
  • the transmission loading system adopts a servo-driven reducer to move left or right to apply load to the sample to complete the sample shear strength test. It has the characteristics of accurate transmission, excellent control, and low noise.
  • the main transmission principle is: the high-precision and wide-speed ratio range of the servo driver receives the electrical control signal, controls the high-precision and wide-speed servo motor, drives the reducer to run, and then drives the synchronous rotation through the reducer to drive the moving beam 4 to move through The indenter 5 loads the test piece.
  • a column 6 is also arranged between the beam 4 and the indenter 5, and the indenter 5 is movably arranged up and down along the column 6.
  • the height position of the indenter 5 can be adjusted, which can be applied to a wider range of test piece sizes and rapid adjustment of the edge force position.
  • the cross beam 4 includes a hinge seat 41, a force receiving body 42 and a sliding guide 43; the hinge seat 41 is hinged to one end of the tension sensor 2 through a rotating shaft, and the force receiving body 42 fixes the hinge seat 41.
  • the bottom is connected with the sliding guide 43 to realize linear movement.
  • the articulated connection allows the output force direction of the transmission loading system 1 to obtain a certain deviation range, avoiding jamming during the transmission process and causing damage to the transmission loading system 1 and the tension sensor 2, etc., which is effectively ensured by the sliding guide device 43
  • the straightness of the trajectory of the pressure 5 driven by the beam 4 is improved, and the stability of the shearing force on the specimen is ensured.
  • the force bearing body 42 bears a large force and there is a process of multiple reciprocating cycles, so its structural strength is relatively large. In order to obtain a more stable structure, it can be strengthened Ribs and other forms to make it have a longer service life.
  • the column 6 includes a guide rod 61, a screw 62 and a screw nut 63; the guide rod 61 has a guide groove 61a that partially covers the indenter 5, and the screw nut 63 is threadedly connected to the screw 62 , And used to fix the indenter 5, the screw rod 62 is arranged in parallel with the length direction of the guide groove 61a. During the rotation of the screw rod 62, the screw nut 63 drives the indenter 5 to move linearly along the guide groove 61a.
  • the screw rod 62 can be fixed by a connecting plate with the guide rod 61, and the connecting plate can be installed on the motor that drives the screw rod 62 to rotate.
  • the upper and lower positions of the indenter 5 can be adjusted more conveniently. It is easy to realize whether the screw 62 is rotated manually or by a motor.
  • a ruler can be set on the guide rod 61, so that the position adjustment can be visualized and the value can be read easily.
  • the clamp includes two clamping plates 7 used to clamp the two end faces of the test piece.
  • the clamping plates 7 are movably arranged and move along a straight line.
  • the clamping force between the two clamping plates 7 can be passed through the two screw rods, and The extrusion of the two nuts screwed with the screw is realized; it also includes at least two supporting plates 8 for supporting the periphery of the test piece and arranged at intervals, wherein at least one supporting plate 8 is movably arranged and along the same straight line as the clamping plate 7 movement.
  • a cylindrical test piece is taken as an example.
  • the aim is to realize the limit of the test piece in the length direction through the clamping plate 7, and the balance indenter 5 is opposite to the test piece.
  • the two support plates 8 realize the effective support of the test piece, ensuring its stability during the stress process, and at least one of them is movably set so that the support position can be adjusted according to the size of the test piece, increasing Versatility.
  • the lower part of the test piece shown in Figure 6 is fixed by the clamp, and the indenter 5 applies force to the upper part of the test piece, where the shear surface of the test piece penetrates the axis of the cylinder Horizontal plane.
  • the supporting part of the supporting plate 8 used to support the test piece includes at least one layer of cushion structure 81 adapted to the surface of the test piece.
  • the increase or decrease is used to adapt to test pieces of various sizes.
  • Each cushion structure 81 and the main body of the support plate 8 are connected by a pressure block 9, wherein the two connecting pieces passing through the two ends of the pressure block 9 are respectively screwed into the cushion structure 81 and the support plate 8.
  • the connection between the two can be realized more conveniently.
  • at least one end of the pressure block 9 for penetrating the connector can be an open groove structure connected to the edge of the pressure block 9.
  • Form 2 As shown in Figure 11, the fixture includes two clamping blocks 10 symmetrically arranged to cover the periphery of the test piece and the part in contact with the test piece.
  • the two clamping blocks 10 are movably arranged and move along a straight line. The movement can be ensured by the guiding structure between the bottom of one of the clamping blocks 10 and the base 3; as shown in Figure 12, the end of the indenter 5 and the outer shape of the test piece are adapted to fit the shape.
  • a cylindrical shape Take the test piece as an example, and the side surface of the indenter 5 is attached to the side surface of one of the clamping blocks 10.
  • the shear surface of the test piece is a plane parallel to its radial direction.
  • the position of the two clamping blocks 10 can be moved to adapt to the force application position of the indenter 5. After adjustment, the positioning device can achieve its positioning. When force is applied , The overlapping surface of the indenter 5 and the clamping block 10 on the side surface is the shear surface.
  • the heating and heat preservation system includes a power supply, a heating element, a temperature sensor and an incubator; the power supply realizes the on and off of the power supply and control signals under the control of the control acquisition system, and the heating element is used to achieve temperature rise in the incubator,
  • the temperature sensor senses the temperature and feeds it back to the control acquisition system.
  • the instrument panel can also be set to read the values.
  • the heating temperature range of 0-100°C can be realized through the above-mentioned device, and the incubator is transparent on one side, which is convenient for observing the test process.
  • a ground-push type shear strength test method including the following steps:
  • S1 Prepare or process test pieces, which are spliced cylindrical test pieces with a diameter of 10cm or 15cm and a height of 6-20cm.
  • the sample preparation process is as follows: forming a cylindrical asphalt mixture sample or cement stabilized gravel mixture sample with a diameter of 10cm or 15cm and a height of 6-20cm, and cut the sample into two semi-cylinders vertically along the diameter Apply the bonding material along the cut surface, and then put the other half of the test piece on top. After the bonding material is cured to form strength, a cylindrical spliced test piece with a seam in the middle is formed.
  • the test piece processing process is as follows: take the core of the splicing part of the new and old base layer of the site reconstruction and expansion project, and take the core along the splicing part of the new and old base layer or the surface layer, with a diameter of 10cm or 15cm, ensuring that half is the old road base or surface Layer, half of which is the new road base layer or surface layer, with the seam in the middle, cut both sides of the core sample taken out flat, and the height is 6-20cm.
  • the preparation process of the test piece is as follows: forming a 30cm*30cm square rut board test piece with a height of 3-10cm, the material is asphalt mixture or cement stabilized gravel mixture, and after a period of cold zone or curing, apply the surface of the test piece Brush the adhesive layer material. After the adhesive layer material is demulsified, continue to form a 30cm*30cm square rut plate specimen with a height of 3-10cm on the surface of the test piece. The material is asphalt mixture. The material is rolled and cooled and demolded, and then drilled. The core sample has a diameter of 10cm and is drilled through the test piece with a height of 6-20cm.
  • the processing process of the test piece is as follows: take the core on the road surface and take the core on the pavement.
  • the diameter is 10cm
  • the height of the core is 6-20cm. It is enough to ensure that it contains different structural layers.
  • the invention has simple operation and accurate results, can truly reflect the bonding effect of new and old pavement splicing parts of the expansion project or whether the bonding effect between pavement layers is good or bad, and has good application prospects.

Abstract

L'invention concerne un dispositif d'essai de résistance au cisaillement du type à poussée au sol, comprenant un système de commande d'acquisition, une machine principale, une pince et un système de chauffage et de conservation de chaleur, le système de chauffage et de conservation de chaleur étant utilisé pour fournir une température ambiante requise pour la machine principale, la pince et une éprouvette fixée sur la pince. L'éprouvette est munie de deux parties reliées au moyen d'un plan, la pince fixant une première partie des deux parties, et sous la commande par le système de commande d'acquisition, la machine principale applique, à l'autre partie de l'éprouvette, une force parallèle à une direction plane. Le dispositif d'essai peut être utilisé pour un essai de résistance au cisaillement d'une éprouvette dans différentes situations, possède une large plage d'applications d'éprouvette, et rompt la limitation d'un appareil de cisaillement classique, celui-ci possédant une seule plage pratique. Le dispositif d'essai peut également mesurer des forces de cisaillement dans différentes plages de température, peut simuler un environnement réel d'une chaussée, et facilite la réflexion de la résistance au cisaillement réelle d'un matériau de liaison. L'invention concerne en outre un procédé de mesure de résistance au cisaillement du type à poussée au sol, celui-ci possédant le même effet technique.
PCT/CN2020/102443 2019-12-31 2020-07-16 Dispositif d'essai de résistance au cisaillement du type à poussée au sol et procédé de mesure associé WO2021135162A1 (fr)

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CN201911422247.1 2019-12-31
CN201911422247.1A CN110987664B (zh) 2019-12-31 2019-12-31 一种地推式剪切强度试验装置及其测试方法

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CN113484107B (zh) * 2021-05-20 2023-12-08 扬州大学 一种Overlay试件专用切割装置
CN114383955B (zh) * 2021-12-27 2023-05-05 苏州航天紧固件有限公司 一种测量紧固件抗剪强度的工装
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