阅读说明：本技术 一种便携式高集成的沥青路面现场检测装置 (Portable high integrated bituminous paving on-site measuring device ) 是由 颜峰 郭荣鑫 罗程 卢开宇 鲁鑫涛 林志伟 杨洋 夏海廷 马倩敏 黄小明 冯明杰 于 2021-07-26 设计创作，主要内容包括：本发明公开了一种便携式高集成的沥青路面现场检测装置,属于道路工程试验设备技术领域,其解决了现有的一些沥青混合料试验设备功能单一、设备运输困难以及抗剪强度试验时只能单向加载的技术缺陷。它主要包括一个保温箱提供试验所需的温度环境,一个滑动伺服机用于提供竖向的荷载,一个配套夹具,夹具内部主要设有可更换的三种试验支座,一个横向加载装置,轴承滑动装置,避免了进行抗剪强度试验横向加载时试件发生横向位移并消除竖向加载时试件与滑动板之间的摩擦力。各结构体积轻巧,方便携带,该试验机集成了几种专用试验机的功能且易于操作,在进行抗剪强度试验时还能双向加载,具有便携集成度高的优点。(The invention discloses a portable high-integration asphalt pavement on-site detection device, belongs to the technical field of road engineering test equipment, and solves the technical defects that some existing asphalt mixture test equipment is single in function, difficult in equipment transportation and only capable of loading in one direction during a shear strength test. The test fixture mainly comprises an insulation box for providing a temperature environment required by a test, a sliding servo machine for providing vertical load, a matched fixture, three replaceable test supports, a transverse loading device and a bearing sliding device, wherein the fixture is internally and mainly internally provided with the three test supports, the transverse loading device and the bearing sliding device, so that the transverse displacement of a test piece during transverse loading of a shear strength test is avoided, and the friction force between the test piece and a sliding plate during vertical loading is eliminated. Each structure volume is light and handy, conveniently carries, and this testing machine has integrated the function and the easy operation of several kinds of special testing machines, can also two-way loading when carrying out shear strength test, has the advantage that portable integrated level is high.)

1. A portable high-integration asphalt pavement on-site detection device is characterized in that a sliding servo machine is arranged on four equal-height circular support rods, the circular support rods are higher than a matched clamp, one support rod is provided with a groove for accommodating an infrared displacement sensor, the sliding servo machine and the clamp are connected into a whole by the four support rods in a welding mode, a force transmission rod is arranged below a loading rod of the sliding servo machine, the two rods are connected through a middle force sensor, and an insulation can is provided with two interlayers; the upper layer of the heat preservation box can be provided with a sliding servo machine and a matched clamp, the middle layer can be provided with a test piece and can heat and preserve the test piece through an electric heating method, the lower layer is a water bath heating device, and a heat preservation cover above the water bath heating device can prevent water vapor from damaging the heat preservation box; the matched clamp is provided with a hole on the left vertical plate and is used for placing a bearing and a fixed rod of the bearing, and a sliding plate is arranged between the bearing and the test piece pressing block; a gasket provided with a circular groove slightly smaller than a circular hole in the middle of the support is arranged on the right side of the matched shear test support, a force sensor can be placed in the gasket groove, the bottom of the gasket can extend into the circular hole in the middle of the shear test support and is attached to the bottom of a test piece, and a vertical plate on the right side of the clamp is provided with a transverse loading device capable of adjusting the speed; the bottoms of the shear test support, the Marshall stability test support and the cleavage test support can be embedded into a square groove formed in the clamp bottom plate and are fixed on the clamp bottom plate through bolts.

2. The portable high-integration asphalt pavement on-site detection device according to claim 1, wherein a hole for placing a bearing fixing rod and a bearing is formed in a vertical plate on the left side of the matched clamp, the bearing, the sliding plate and the test piece pressing block are tightly attached in pairs, and a width of 5mm is reserved between the test piece pressing block and the shear test support; the bottom of the shear test support, the stability test support and the splitting test support can be embedded into the grooves formed in the bottom plate of the clamp and fixed on the bottom plate of the clamp through bolts; the shear test support and the shear test cover plate at the upper part are fixedly connected through bolts, two rods are arranged at two sides of the stability test support and the splitting test support, and the stability test cover plate and the splitting test cover plate can slide up and down along the rods; the gasket is provided with a circular groove specially used for placing the force sensor, the size of the gasket is slightly smaller than the circular aperture in the shear test support, the bottom of the gasket can stretch into the shear test support and is attached to the bottom of a test piece, a transverse loading device capable of adjusting the loading rate is placed on a vertical plate on the right side of the clamp, and the width of 5mm is reserved between the transverse loading device and the gasket.

3. The portable high-integration asphalt pavement on-site detection device according to claim 1, wherein the sliding servo is installed on four circular support rods, one of the support rods is provided with a groove for fixing the infrared displacement sensor, infrared rays of the infrared displacement sensor can directly irradiate the dowel bar, and the four support rods are fixed with the clamp bottom plate in a welding manner.

4. The portable high-integration asphalt pavement on-site detection device according to claim 1, wherein the back surface, the left surface and the right surface of the incubator are made of stainless steel plates, and the front surface is provided with a glass door for clearly observing the change of the test piece during the processes of the shear strength test, the marshall stability test and the splitting test.

5. The portable high-integration asphalt pavement on-site detection device according to any one of claims 1 to 4, which discloses application in road engineering test equipment.

Technical Field

The invention belongs to the technical field of road engineering test equipment, and relates to a portable high-integration asphalt pavement on-site detection device.

Background

The highway mileage of China is the second place worldwide, wherein the asphalt pavement accounts for more than 90%, a lot of diseases can appear on the asphalt pavement along with the increase of the service life of the asphalt pavement, cracks are the main common diseases of the semi-rigid base asphalt pavement and mainly appear as transverse cracks, longitudinal cracks, cracking, net cracks and the like, the crack problem is one of the common, easy-to-occur and early-to-occur diseases in various damages, almost along with the whole service cycle of the pavement, and the crack problem is more and more serious along with the increase of the road age, so that the service life of the pavement is reduced, and the great economic loss is caused.

In order to prevent the occurrence of asphalt pavement diseases, various test projects on the asphalt pavement are needed to provide data for the engineering quality evaluation and acceptance of the asphalt pavement, and the execution condition of the proportion and the specific conditions and problems of the site construction can be analyzed and judged by matching with the Marshall test result, so that the corresponding adjustment can be performed in the construction links of raw materials, mixture mixing, transportation, site paving and rolling. The construction site mainly carries out various test items such as a shear strength test, a Marshall stability test, a drawing test, a splitting test and the like after sampling from the asphalt pavement, and the following problems exist in the field detection of the engineering quality of the asphalt pavement at present: different asphalt mixture tests need to be completed by a special testing machine or a universal testing machine (such as UTM), but the testing machine on the market is high in price, and a plurality of organizations cannot afford to purchase a plurality of special testing machines for testing asphalt mixtures; the testing machines special for various asphalt mixtures are inconvenient to carry to an asphalt pavement construction site for detection, and the loading, unloading and transportation of various testing machines cause great obstruction to the whole detection link; when the shear strength test of the asphalt mixture is carried out, some testing machines which can be used for testing the shear strength test of the asphalt mixture only consider the one-way loading condition of the asphalt pavement, the simulation degree of the actual stress condition of the pavement is not high, so that the test result has certain deviation with the actual numerical value. By combining the analysis, a light and portable field detection device with high integration level and capability of simulating the actual stress condition of the road surface is urgently needed in the road engineering detection market at present.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a portable high-integration asphalt pavement on-site detection device which comprises a sliding servo, a matched clamp and an insulation can, wherein the sliding servo is arranged on four round supporting rods, the four supporting rods are fixed on a clamp bottom plate through welding, when the device is used, after a corresponding structure is arranged in the clamp, the clamp and the sliding servo are placed in the insulation can, and the proper positions of the sliding servo and the matched clamp are adjusted to complete the shear strength, Marshall stability and splitting test of asphalt mixtures, and the insulation can is used for providing a heat insulation environment required by the existing road engineering asphalt and asphalt mixture test regulation (JTG E20). The heat preservation box can provide two heat preservation modes of electric heating and water bath heating according to heat preservation conditions specified in different tests. The loading rod below of slip servo has set up a telescopic dowel steel and has connected through a force transducer, can be used the vertical force that the slip servo was applyed to the test piece through the dowel steel on, in order to improve the accuracy of shear strength test result, supporting anchor clamps siding wall has laid a horizontal loading device of adjustable speed, with this simulation bituminous paving two-way atress situation, in addition, supporting anchor clamps bottom is opened has a circular shape and is drawn the hole, place anchor clamps and slip servo on the road surface, the adjustment slip servo's loading rod and dowel steel make it just to drawing the hole centre of a circle, can be used to accomplish again after dismantling the structure of laying on anchor clamps and bituminous paving the interlaminar adhesive strength test.

In order to achieve the purpose, the sliding servo of the portable high-integration asphalt pavement on-site detection device is arranged on four equal-height circular support rods, the circular support rods are higher than a matched clamp, one support rod is provided with a groove, an infrared displacement sensor is placed in the groove, the sliding servo and the clamp are connected into a whole through the four support rods in a welding mode, a force transmission rod is arranged below a loading rod of the sliding servo, the two rods are connected through a middle force sensor, and an insulation can is provided with two interlayers. The sliding servo machine and the matched clamp can be placed on the upper layer of the heat preservation box, the test piece can be placed on the middle layer of the heat preservation box, the test piece can be heated and heat preserved through an electric heating method, the water bath heating device is arranged on the lower layer of the heat preservation box, the test piece can be heated and heat preserved through a water bath heating mode, and the heat preservation cover above the water bath heating device can prevent water vapor from damaging the heat preservation box. The supporting anchor clamps erect the version trompil in the left side for lay the dead lever of bearing and bearing, be equipped with a sliding plate in the middle of bearing and the test piece briquetting. When carrying out shear strength test, friction between test piece and the sliding plate when sliding plate and bearing can prevent that horizontal loading test piece from taking place lateral displacement and can eliminate vertical loading, supporting shear test support right side sets up the gasket that is equipped with the circular recess that is slightly littleer than the middle round hole of support, can place a force sensor in the gasket recess, the gasket bottom can stretch into the middle round hole of shear test support and laminate bottom the test piece, but anchor clamps right side riser installation speed regulation's horizontal loading device. The force applied by the transverse loading device can be transmitted to the test piece through the gasket, so that the actual stress condition of the road surface can be simulated more accurately, and the accuracy of the shear strength test result is improved. In addition, the bottoms of the shear test support, the Marshall stability test support and the cleavage test support can be embedded into a square groove formed in the clamp bottom plate and fixed on the clamp bottom plate through bolts, if the Marshall stability test and the cleavage test need to be carried out, only the corresponding support is required to be installed on the clamp bottom plate, and then the sliding servo is matched for loading, if the asphalt pavement field drawing test needs to be carried out, only the clamp and the sliding servo integrated device are required to be taken out from the heat preservation box and placed on the pavement, and the redundant structure in the clamp is disassembled, and the positions of the loading rod and the dowel rod of the clamp and the sliding servo are adjusted to ensure that a circular drawing hole formed in the clamp bottom plate can be used for carrying out the asphalt pavement interlayer bonding strength test just for the dowel rod.

Preferably, the supporting clamp is provided with a hole for placing the bearing fixing rod and the bearing at the vertical plate at the left side, the bearing, the sliding plate and the test piece pressing block are tightly attached in pairs, and the width of 5mm is reserved between the test piece pressing block and the shearing test support. The clamp bottom plate is provided with a square groove and a circular groove, the shape and the size of the square groove are the same as those of the bottom of the support, the circular groove is slightly larger than the diameter of the drawing head by 2mm, the centroids of the two grooves are located at the same point, and the bottoms of the shear test support, the stability test support and the splitting test support can be embedded into the groove formed in the clamp bottom plate and are fixed on the bottom plate of the clamp through bolts. The shear test support and the shear test cover plate at the upper part are fixedly connected through bolts, two rods are arranged at two sides of the stability test support and the splitting test support, and the stability test cover plate and the splitting test cover plate can slide up and down along the rods; the gasket is provided with a circular groove specially used for placing a force sensor, the size of the gasket is slightly smaller than the circular aperture in the shear test support, when the shear strength test is carried out, the bottom of the gasket can stretch into the shear test support and is attached to the bottom of a test piece, the force applied by a transverse loading device can be transmitted to the test piece, the gasket can be prevented from falling due to self weight before the test, the transverse loading device capable of adjusting the loading rate is placed on a vertical plate on the right side of the clamp, and the width of 5mm is reserved between the transverse loading device and the gasket.

Preferably, the sliding servo machine is installed on four round supporting rods, one of the supporting rods is provided with a groove for fixing an infrared displacement sensor, infrared rays of the infrared displacement sensor can be directly irradiated onto the dowel bar, the four supporting rods are fixed with the clamp bottom plate in a welding mode, the shear strength test of the asphalt mixture is carried out, the stability test and the splitting test are carried out, the deformation of a test piece in the test process is replaced by the displacement of the dowel bar, the displacement of the whole-process dowel bar is measured through the infrared displacement sensor, a force sensor is connected between the sliding servo machine loading rod and the dowel bar and used for measuring the load applied by the whole-process sliding servo machine, and the shear sensor in the gasket groove is used for measuring the load applied by the transverse loading device when the shear strength test is carried out.

Preferably, the back surface, the left surface and the right surface of the heat insulation box are both made of stainless steel plates, and the front surface is provided with a glass door, so that the change of a test piece in the processes of carrying out a shear strength test, a Marshall stability test and a cleavage test can be clearly observed.

The invention has the beneficial effects that:

the invention solves the problem that the field detection device which is light and portable, has high integration level and can simulate the actual stress condition of the pavement is not available in the field detection field of the construction quality of the asphalt pavement at present.

Drawings

FIG. 1 is an exploded view of the various structures of the clamp;

FIG. 2 is a view showing the structure of the incubator;

FIG. 3 is a sectional view taken along line 1-1;

FIG. 4 is a schematic view of a shear strength test structure installation;

FIG. 5 is a schematic illustration of the installation of a cleave test structure;

FIG. 6 is a schematic view of a stability test structure installation;

FIG. 7 is an installation schematic diagram of a structure for an asphalt pavement interlayer bonding strength test;

description of reference numerals: 1. the device comprises a vertical plate 2, a bottom plate 3, a lifting rod 4, a bearing 5, a bearing gasket 6, a bearing fixing rod 7, a sliding plate 8, a test piece pressing block 9, a test piece 10, a shear test support 10-1, a shear test cover plate 11, a fracture test support 11-1, a fracture test cover plate 12, a stability test support 12-1, a stability test cover plate 13, a pull head 14, a gasket 15, a force sensor 16, a transverse loading device 17, a sliding servo 17-1, a loading rod 17-2, a force transmission rod 18, an infrared displacement sensor 19, a supporting rod 20, an insulation box 20-1, an interlayer 20-2, a glass door 20-3, a water bath heating device 20-4, an insulation cover 21 and bolts.

Detailed Description

The present invention will be described in detail with reference to the following specific examples.

A portable high-integration asphalt pavement on-site detection device comprises a supporting clamp inside an insulation box 20 and a sliding servo 17 above the clamp, wherein the sliding servo 17 is installed on four support rods 19, the four support rods 19 are equal in height and higher than the clamp and are fixed on a clamp bottom plate 3 in a welding mode, one support rod 19 is provided with a groove for placing and fixing an infrared displacement sensor 18, the middle parts of a loading rod 17-1 and a transmission rod 17-2 of the sliding servo are connected with each other through a force sensor 15, the clamp is provided with a hole on a vertical plate 1 on the left side for placing a bearing 4 and a bearing fixing rod 6 to form a fixed sliding device, a sliding plate 7 is arranged between the bearing 4 and a test piece pressing block 8, the bottom plate 2 is provided with a square groove with the same size as the bottom of a support and a circular groove with the diameter being slightly larger than that of a drawing head 13 by 2mm, and the centers of the square groove and the circular groove are positioned at the same point, the bottom of the shearing test support 10, the splitting test support 11 and the stability test support 12 can be embedded into a square groove formed in the bottom plate 2 and fixed on the bottom plate 2 through bolts 21. The shear test support 10 and the shear test cover plate 10-1 at the upper part are fixedly connected through a bolt 21, two round rods are arranged at two sides of the split test support 11 and the stability test support 12, and the split test cover plate 11-1 and the stability test cover plate 12-1 can slide up and down along the round rods at the two sides of the support; the gasket 14 is provided with a groove for placing a force sensor 15, the size of the gasket 14 is slightly smaller than a round hole in the middle of the shear test support 10, the bottom of the gasket 14 can be ensured to extend into the shear support 10 to be attached to the test piece 9, and the gasket 14 can be prevented from falling due to self gravity before a shear strength test is carried out and can transmit the force applied by the transverse loading device 16 to the test piece 9. Horizontal loading device 16 lays on right side riser 1, and the device can adjust loading rate by oneself according to experimental needs, reserves 5mm width between horizontal loading device 16 and the gasket 14, sets up two portable poles 4 between two risers 1 and can play the support and conveniently carry the effect of taking the equipment. The insulation can 20 is provided with two interlayers 20-1, the insulation can is divided into three layers, the upper layer is used for placing a sliding servo machine 17 and a matched clamp, when a shear strength test, a Marshall stability test and a cleavage test are required, the insulation can 20 can be set with different temperatures according to requirements to reach test temperature conditions required by the current road engineering asphalt and asphalt mixture test regulation (JTG E20) specification, the middle layer is used for storing a test piece 9 and can heat and insulate the test piece 9 in an electric heating mode, the water bath heating device 20-3 at the lower layer can heat and insulate the test piece in a water bath heating mode, the insulation cover 20-4 can be used for locking hot air and preventing steam from volatilizing to damage the insulation can 20, the back surface and the left and right surfaces of the insulation can 20 are made of stainless steel plates, the front surface is provided with a glass door 20-2 which can clearly observe the shear strength test, Change of test piece 9 during the marshall stability test and the cleavage test.

According to the matched clamp base plate 2, the vertical plates 1 are all groove solid steel plates, the left vertical plate 1 is provided with a circular groove and a rectangular groove which transversely penetrate through the whole plate, the diameter of the circular groove is 1mm larger than that of the rod and is used for placing the bearing fixing rod 6, the width of the rectangular groove is 4-6mm larger than that of the bearing 4, the height of the rectangular groove is 4mm larger than that of the bearing 4 and is used for placing the bearing 4, when the bearing fixing rod 6 is used for placing the bearing 4, corresponding bearing gaskets 5 are required to be placed on two sides of each bearing 4 to prevent the bearing 4 from sliding left and right, the hand-held rod 4 is a solid steel rod, and all joints of the clamp base plate 3, the vertical plates 1 and the hand-held rod 3 are welded and fixed. When carrying out shear strength test, sliding plate 7 and bearing 4 can prevent that horizontal loading test piece 9 from taking place lateral displacement and can eliminate the friction between test piece 9 and the sliding plate 7 when vertical loading, shear test support 10 right side sets up and is equipped with the notched gasket 14 of opening slightly littleer than the support middle round hole, can place a force sensor 15 in the gasket 14 recess, gasket 14 bottom can stretch into shear test support 10 middle round hole in and laminate bottom the test piece 9, but the horizontal loading device 16 of rate regulation is installed to anchor clamps right side riser 1. The force applied by the transverse loading device 16 is transmitted to the test piece 9 through the gasket 14, so that the actual stress condition of the road surface is more accurately simulated, and the accuracy of the shear strength test result is improved. The shear test support 10, the Marshall stability test support 12 and the cleavage test support 11 can be embedded into a square groove formed in the fixture bottom plate 2 and fixed on the fixture bottom plate through bolts 21, the shear strength test, the Marshall stability test and the cleavage test can be completed by replacing the middle support and matching with a sliding servo 17, the sliding servo 17 is installed on four support rods 19 and connected with the fixture into a whole through welding, the sliding servo 17 can move a loading rod 17-1, a force sensor 15 and a force transmission rod 17-2 which are connected below the loading rod 17-1 in a sliding mode, the loading rod 17-2 is adjusted to be aligned to the circle center of a circular drawing hole in the fixture bottom plate 3, and the asphalt pavement interlayer bonding strength test can be completed after redundant structures on the fixture are disassembled.

The sliding servo 17 is fixedly arranged on four support rods 19 to form a vertical loading device, the four support rods 19 have the same height and are higher than a matched clamp, the bottoms of all the rods are fixed on a clamp bottom plate 3 in a welding mode, one support rod 19 is provided with a groove for fixing and placing an infrared displacement sensor 18, infrared rays emitted by the infrared displacement sensor 18 can directly irradiate a force transmission rod 17-2, and the force transmission rod 17-2 is connected with the loading rod 17-1 through a force sensor 15. The dowel bar 17-2 is a telescopic round bar, and the length of the dowel bar can be adjusted according to needs. The heat preservation box 20 is internally provided with two interlayers 20-1 which divide the interior of the heat preservation box into three parts, the upper layer is used for placing a sliding servo machine 17 and a matched clamp integrated device, the middle layer is used for placing a test piece 9 and can heat and preserve heat of the test piece 9 in an electric heating mode, the water bath heating device 20-3 at the lower layer can heat the test piece 9 in a water bath heating mode, a heat preservation cover 20-4 above the water bath heating device 20-3 can be used for locking hot air and preventing steam from damaging the heat preservation box 20, the heat preservation box 20 can be set with different temperatures according to requirements to achieve test temperature conditions required by the existing road engineering asphalt and asphalt mixture test regulation (JTG E20), the back surface and the left and right surfaces of the heat preservation box 20 are made of stainless steel plates, the front surface is provided with a glass door 20-2 which can clearly observe the shear strength test, Change of test piece 9 during the marshall stability test and the cleavage test.

The above-described embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the scope of the invention, but rather as encompassing any equivalent modifications within the scope of the claims to which the invention pertains.

The following are specific uses and steps of operation of the invention to facilitate a further understanding of the invention.

Example 1.

Marshall stability test:

(1) sampling: randomly sampling from a target detection asphalt road section, and drilling a standard core sample test piece of a compacted asphalt mixture road surface according to the method of the existing road engineering asphalt and asphalt mixture test regulation (JTG E20) during sampling. After sampling, sticky layer oil, penetrating layer oil, loose particles and the like adhered to the core sample specimen must be cleaned.

(2) And (3) heat preservation: the temperature of the water bath heating device is set to be the specified temperature required by the specification, the temperature is accurately controlled to be 1 ℃, and the depth of the water tank is not less than 150 mm. The test pieces should be spaced, the distance between the bottom of the test pieces and the bottom of the water tank should be not less than 5mm, and the heat preservation time is 30-40min for the standard test pieces. And placing the stability test support and the stability test cover plate in the middle layer of the heat insulation box or a water bath heating device which reaches the specified temperature to enable the temperature to reach the same temperature as the test piece.

(3) Installing a test piece and a support: before installation, the stability test cover plate can freely slide along the two rods of the support, and a small amount of grease can be coated on the two rods of the support. The stability test support is placed on a fixture and fixed through a bolt, a test piece is placed on the fixed support, then a cover plate is placed, the fixture is placed in an insulation box, a sliding servo is placed right above the fixture, and a dowel bar of the sliding servo is aligned with the center of the cover plate.

(4) Loading: adjusting infrared rays emitted by an infrared displacement sensor arranged in a groove of the supporting rod to directly irradiate the dowel bar, zeroing the force sensor and the infrared displacement sensor, starting to load through a loading device of the sliding servo, and controlling the loading rate of the sliding servo to keep 50mm/min +/-5 mm/min. And a force sensor between the dowel bar and the loading bar of the sliding servo is used for measuring the load applied to the test piece by the sliding servo. The reading precision is accurate to 0.1KN, the falling displacement of the dowel bar replaces the deformation of the test piece in the test process, and the displacement is displayed on the reading of the infrared displacement sensor

And counting, the accuracy is 0.1mm, the loading is stopped at the moment when the test load reaches the maximum value, and the data of the whole process of the force sensor and the infrared displacement sensor is exported.

(5) And (3) analyzing test results: calculated according to the current test procedure for road engineering asphalt and asphalt mixture (JTG E20).

Example 2.

Shear strength test:

(1) sampling: randomly sampling from a target detection asphalt road section, and drilling a standard core sample test piece of a compacted asphalt mixture road surface according to the method of the existing road engineering asphalt and asphalt mixture test regulation (JTG E20) during sampling. After sampling, sticky layer oil, penetrating layer oil, loose particles and the like adhered to the core sample specimen must be cleaned.

(2) And (3) heat preservation: setting the temperature of the incubator as the specified temperature required by the specification, controlling the temperature accurately to +/-1 ℃, and placing the test piece, the stability test support and the stability test cover plate in the intermediate layer of the incubator which reaches the specified temperature for heat preservation for 4-5 h.

(3) Installing a test piece and a support: fixing a shear test support on a clamp through a bolt, quickly placing a test piece which reaches the test specified temperature in the clamp for stable placement, covering a shear test cover plate and then fixing the test piece by the bolt, and then placing a sliding servo and the clamp integrated device in an incubator to align a dowel bar of the sliding servo with the center of the cover plate.

(4) Loading: the adjustment is installed and is penetrated the dowel bar directly in the infrared ray that the infrared displacement sensor of bracing piece recess launches, zero force sensor and infrared displacement sensor, adjustment dowel bar and apron contact, the load is no longer than 30N, at first, exert horizontal load according to invariable loading rate, transmit horizontal load for the test piece through the gasket, the test piece continues to transmit power for the sliding plate, can not begin to exert vertical load when gliding because of the dead weight after the sliding plate atress, control slip servo loading rate is 0.1 mm/min. And a force sensor between the dowel bar and the loading bar of the sliding servo is used for measuring the load applied to the test piece by the sliding servo. The force sensor is used for measuring the size of horizontal load in the gasket, and sensor reading precision is accurate to 0.1KN, replaces the deformation of test piece with the whereabouts displacement of dowel steel in the experimentation, and the displacement shows on infrared displacement sensor's reading, and is accurate to 0.1mm, stops the loading when the test piece interlayer separates to derive the data of force sensor and infrared displacement sensor overall process.

(5) And (3) analyzing test results: calculated according to the current test procedure for road engineering asphalt and asphalt mixture (JTG E20).

Example 3.

Splitting test:

(1) sampling: randomly sampling from a target detection asphalt road section, and drilling a standard core sample test piece of a compacted asphalt mixture road surface according to the method of the existing road engineering asphalt and asphalt mixture test regulation (JTG E20) during sampling. After sampling, sticky layer oil, penetrating layer oil, loose particles and the like adhered to the core sample specimen must be cleaned.

(2) And (3) heat preservation: the water bath of the water bath heating device is enabled to reach the required test temperature +/-0.5 ℃. Soaking the test piece in a constant-temperature water tank for heat preservation for not less than 1.5 h. Until the internal temperature of the test piece reaches the test temperature +/-0.5 ℃. The distance between the test pieces is not less than 10mm during heat preservation.

(3) Placing a test piece and a support: before installation, the splitting test cover plate can freely slide along the two rods of the support, and a small amount of grease can be coated on the two rods of the support. The splitting test support is placed on a clamp and fixed through a bolt, a test piece is placed on a fixing support, then a cover plate is placed, and then a sliding servo and the clamp integrated device is placed in an insulation can, so that a dowel bar of the sliding servo is aligned with the center of the cover plate.

(4) Loading: the infrared ray that the infrared displacement sensor that the adjustment was installed in the bracing piece recess launches penetrates dowel bar directly, with force sensor and infrared displacement sensor zero setting, adjustment dowel bar and apron contact, begin to load through the loading device of slip servo when the load is no more than 30N, control slip servo load rate and keep 50 mm/min. And a force sensor between the dowel bar and the loading bar of the sliding servo is used for measuring the load applied to the test piece by the sliding servo. The reading precision is accurate to 0.1KN, the falling displacement of the dowel bar replaces the deformation of the test piece in the test process, the displacement is displayed on the reading of the infrared displacement sensor and is accurate to 0.1mm, the loading is stopped when the test piece is split and damaged, and the data of the whole process of the force sensor and the infrared displacement sensor is exported.

(5) And (3) analyzing test results: calculated according to the current test procedure for road engineering asphalt and asphalt mixture (JTG E20).

Example 4.

And (4) testing the interlayer bonding strength of the asphalt pavement.

Preparation work: before a test, the sliding servo and the clamp integrated device are required to be placed on a road surface, redundant structures inside the clamp are disassembled, the position of the clamp is adjusted to enable the circular hole formed in the bottom plate of the clamp to be over against the circle center of the drawing head, and the centers of the circular hole of the clamp, the circle center of the drawing head and the center of the dowel bar are located on the same axis.

The method is carried out according to the experimental standard operation flow required by the current standard 'road roadbed pavement field test regulation' (JTG 3450-2019).

(1) The construction material should be fully cured. And randomly selecting test points according to the field condition, and marking the test points on the field. And testing and recording the surface temperature of the testing point.

(2) The diameter of the pull head is firstly measured by a vernier caliper to be accurate to 0. lmm. Cleaning the surface of a test point, coating a layer of adhesive on the bottom of the pull head, and quickly adhering the pull head to the surface of the test point. After the adhesive is coated and cured completely, a ring groove is carefully cut along the edge of the pull head by a cutter to a depth of the top surface of the underlying layer.

(3) And drilling a ring groove at the measuring point by using a core drilling machine, wherein the inner diameter is (100-. And cleaning fragments in the ring groove, and then actually measuring the inner diameter of the ring groove by using a vernier caliper to be accurate to 0.1 mm. Cleaning and drying the surface of the measuring point, coating a binder (such as quick-setting epoxy resin and the like), and bonding the surface layer of the asphalt pavement and the drawing head through the binder, so that the contact surface of the binder and the drawing head is uniformly bonded in the bonding process, the asphalt pavement is prevented from being stressed unevenly in the drawing process, and the binder does not enter the annular groove; after curing and complete curing, the next test is ready. .

(4) The puller is bonded to the dowel bar, the slide servo is started and the pull test is performed. The stretching rate was set to (25+15) kPa/s. When other drawing speeds are selected, they are noted in the test report.

(5) And when the test is broken, reading the maximum tensile force F of the force sensor as a test result.

(6) After the test is broken, the condition of the broken surface is observed, and the detailed note in the detection report is needed.

(7) 3 points need to be tested at each position, the distance between every two testing points is not less than 500mm, and the total distance is controlled within 2 m.