CN202066761U - Torsion shear test device used for bituminous pavement materials and structure - Google Patents
Torsion shear test device used for bituminous pavement materials and structure Download PDFInfo
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- CN202066761U CN202066761U CN2011201633342U CN201120163334U CN202066761U CN 202066761 U CN202066761 U CN 202066761U CN 2011201633342 U CN2011201633342 U CN 2011201633342U CN 201120163334 U CN201120163334 U CN 201120163334U CN 202066761 U CN202066761 U CN 202066761U
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Abstract
本实用新型涉及公路工程沥青路面材料与结构研究领域，公开了一种用于沥青路面材料与结构的扭转剪切试验装置，其特征在于，包括机座，设置在机座上的反力架，设置在反力架底部的蜗轮蜗杆机构，蜗轮蜗杆机构的蜗杆输入端连接压力电机，蜗轮输出端连接用于夹持试件的下支撑板，下支撑板上设置有压力传感器；所述反力架顶部设置有扭矩电机，扭矩电机输出轴向下依次连接盘式扭矩传感器和用于夹持试件的上支撑板。
The utility model relates to the research field of asphalt pavement materials and structures in highway engineering, and discloses a torsional shear test device for asphalt pavement materials and structures. The worm gear and worm mechanism arranged at the bottom of the reaction force frame, the worm input end of the worm gear and worm mechanism is connected to the pressure motor, the output end of the worm gear is connected to the lower support plate for clamping the test piece, and a pressure sensor is arranged on the lower support plate; the reaction force A torque motor is arranged on the top of the frame, and the output shaft of the torque motor is connected downwards with the disc torque sensor and the upper support plate for clamping the specimen in turn.
Description
Technical field
The utility model relates to highway engineering asphalt pavement material and structural research field, particularly a kind of torsion shear test device that is used for asphalt pavement material and structure.
Background technology
Advantages such as usability and the mechanized construction degree height that the road mask that the asphalt making forms has is smooth, antiskid, comfortable, damping etc. are good, the duration is short, maintenance is convenient are widely used in highway pavement and airfield pavement.Asphalt is a kind of compound substance with viscoelastic rheological characteristics, and it is made up of pitch, coarse aggregate, fine aggregate and breeze and outer-penetrating agent.Because the place of production, composition material source, granule-morphology, the difference of quality and the difference of match ratio, and combining road structure and functional requirement can form different compound component types, show different mechanical characteristics.
The shearing strength of asphalt pavement material and structure
, depend primarily on cohesive strength
And angle of internal friction
Two important parameters.Different materials according to asphalt is formed, and can form three class formations: (a) suspension compact structure, this type of compound packing is bigger, at different levels gathering materials for secondary gathering materials separates, can not draw close formation skeleton, cohesive strength mutually between gathering materials
Higher, but the frictional resistance angle
Lower, shear resistance is poor; (b) skeleton gap structure, this type of compound coarse aggregate ratio is higher, and fine aggregate is less, and coarse aggregate can form skeleton, again because fine aggregate is not enough to fill the space between the skeleton less, frictional resistance angle in the compound
Bigger, but cohesive strength
Lower, shear behavior is better.(c) closely knit-skeleton structure, the existing more coarse aggregate of this type of compound forms spatial skeleton, but a considerable amount of fine aggregate packing skeletons space is arranged again, and compound is cohesive strength not only
Higher, and interior frictional resistance angle
Also bigger, the shear resistance optimum.
Acted on repeatedly by traffic loading, the shear behavior of asphalt is of crucial importance to the influence in serviceable life of road face, particularly under the megathermal climate condition, often because the deficiency of asphalt shear behavior, cause the road surface rut to occur, gather around diseases such as bag, passing, had a strong impact on the service quality and the serviceable life of bituminous pavement or airfield pavement.
From the thirties in 20th century, the research of road engineering bound pair bituminous pavement or shear strength of asphalt mixture is very active always both at home and abroad, corresponding testing equipment and test method have been developed, V.A.Endersby at first proposes how to prepare the bituminous concrete test specimen under the triaxial test condition, and has proposed concrete test method; L.W.Nijboer utilizes by three data that record and carries out the compound design, and more perfect in order to make design, he utilizes the Prandtl formula that the compound under the condition of palsticity is assessed; V.R.Smith has set forth the shearing stress of road, and provided the type that the triaxial test method is adopted, loading velocity and temperature are to the shear resistance influence of test specimen, propose the criterion of failure of asphalt and the physical property that compound should satisfy, and provided the shearing resistance requirement that compound should reach under different loading conditions.
Norman W.Mcleod incorporates the ground connection distribution pressure figure of tire in the mechanical analysis of road pavement, the inhomogeneous characteristic that distributes according to the ground pressure of tire, proposed different design standardss, obtained design nomogram based on the road surface shearing resistance under the lines enveloping line; Edward S.Barber has provided the stress of road surface road under horizontal shearing stress and vertical load while action condition, and point out, must consider the effect of horizontal shearing stress in the highway layout, under horizontal force and vertical loads, the shear stress that produces in the pavement structure increases greatly; Kiryukhin has proposed to utilize shearing-resistance characteristic and control crack to carry out the method for Pavement Design, but does not propose concrete test method and exercisable control criterion.
At home, the scholar of Tongji University has analyzed many disease reasons that current bituminous pavement occurs, the infringement and the compound shear behavior deficiency that draw road are closely bound up, adopt the uniaxial penetration test method, provided the intensive parameter of finding the solution shear stress in the uniaxial penetration test, by unconfined compression test,, sum up and find the solution by means of the triaxial test principle
With
The method of value; The highway scholar of Chang An University has developed the direct shear test device of bituminous pavement interlayer, has determined direct shear test condition and parameter according to domestic and international achievement in research and a large amount of test findings, check compound shearing strength at intersection performance.
Although Chinese scholars has been carried out research more in depth from the angle of theoretical and test to asphalt and bituminous pavement interlayer problem, but the rut and the endurance issues of bituminous pavement are not solved yet, still be one of main disease of bituminous pavement, restricted seriously that asphalt is applied and highway communication is built sustainable development.In sum, existing shearing test method can not reflect the road surface mechanical behavior of asphalt exactly.
Summary of the invention
The purpose of this utility model is to form mechanism from shear strength of asphalt mixture, the endexoteric of its shear behavior of analyzing influence, a kind of torsion shear test device that is used for asphalt pavement material and structure is provided, this device can carry out asphalt torsional shear failure test, torsional shear creep test, repetition torsion shear test, the compound interlayer torsion shear test under the controlled condition, can accurately estimate the shear behavior and the interlaminar bonding performance of asphalt.
In order to achieve the above object, the utility model is achieved by the following technical solutions.
A kind of torsion shear test device that is used for asphalt pavement material and structure, it is characterized in that, comprise support, be arranged on the reaction frame on the support, be arranged on the worm-and-wheel gear of reaction frame bottom, the worm screw input end of worm-and-wheel gear connects the pressure motor, and the worm gear output terminal connects the lower supporting plate that is used for clamping test pieces, and lower supporting plate is provided with pressure transducer; Described reaction frame top is provided with torque motor, and the torque motor output shaft connects the disc type torque sensor downwards successively and is used for the upper backup pad of clamping test pieces.
Further improvement of the utility model and characteristics are:
Described support is provided with the environment temperature case, and reaction frame is positioned at the environment temperature case.
Described pressure motor and torque motor are respectively stepper motor.
Be fixed with holding ring respectively on the described upper and lower back up pad, the holding ring inwall is provided with rubber blanket.
This device also comprises a computing machine, and the interface of described computing machine connects disc type torque sensor and pressure transducer respectively, and main frame configuration torsional shear monitoring and control configuration software is gathered moment of torsion, pressure data in real time.
Torsion shear test device of the present utility model, reaction frame is set on support, the worm-and-wheel gear that the reaction frame bottom is provided with, the worm screw input end of worm-and-wheel gear connects the pressure motor, the worm gear output terminal connects the lower supporting plate that is used for clamping test pieces, lower supporting plate is provided with pressure transducer, and pressure motor, worm-and-wheel gear drive lower supporting plate and move upward, and provide vertical pressure to test specimen; The reaction frame top is provided with torque motor, and the torque motor output shaft connects the disc type torque sensor downwards successively and is used for the upper backup pad of clamping test pieces, and torque motor drives upper backup pad and provides horizontal moment of torsion to test specimen; Main frame disposes the data of importing into that torsional shear monitoring and control configuration software is gathered pressure transducer and disc type torque sensor in real time, can accurately reflect the essence of the torsional shear deformation process of asphalt pavement material and structure.
The utility model forms mechanism according to shear strength of asphalt mixture, in the torsional shear process, aggregate particle deformation with comprehensive contact of rubber cement, the physical dimension of gathering materials, surface particles pattern all can embody in torsion shear test to some extent, the essence that can reflect the mixture shearing deformation process, inhomogeneous, the spatiality of gathering materials avoiding distributing owing to aggregate particle in the direct shear test cause a deviation to test findings, and therefore, torsion shear test result is more representative.
The utility model can carry out the torsion shear test of different controlled conditions, can design Vertical Load, horizontal torsion load and load waveform according to testing requirements, carry out various types of torsion shear tests, estimate the viscoelastic rheological characteristics of asphalt, test findings can be given prominence to the permanent strain mechanism that the reflection compound produces, and can be effectively applied to comparison and estimate the performance of the resistance to permanent deformation of various asphalts.
In the utility model, reaction frame is positioned at the environment temperature case, can the simulated environment temperature variation; Pressure motor and torque motor are respectively stepper motor, can accomplish the accurate control to pressure and moment of torsion; Utilize the interface of computing machine to connect disc type torque sensor and pressure transducer respectively, image data is convenient to analyze experimental result in real time.
Description of drawings
Below in conjunction with the drawings and specific embodiments content of the present utility model is described in further details.
Fig. 1 is a kind of structural representation that is used for the torsion shear test device of asphalt pavement material and structure.
Fig. 2 is test specimen fastening clips figure;
Wherein: 1, base; 2, environment temperature case; 3, reaction frame; 4, temperature sensor; 5, torque motor; 6, step axle; 7, bearing; 8, disc type torque sensor; 9, transition axis; 10, upper backup pad; 11, pressure transducer; 12, lower supporting plate; 13, worm-and-wheel gear; 14, pressure motor; 15, holding ring; 16, rubber blanket.
Embodiment
With reference to Fig. 1, be a kind of torsion shear test device that is used for asphalt pavement material and structure of the present utility model.Its support 1 is provided with environment temperature case 2, environment temperature case 2 internal fixation reaction frames 3, the bottom of reaction frame 3 worm-and-wheel gear 13 is set, the worm screw input end of worm-and-wheel gear 13 connects pressure motor 14, the worm gear output terminal connects the lower supporting plate 12 that is used for clamping test pieces, and lower supporting plate 12 is provided with pressure transducer 11.Can realize the vertical motion of lower supporting plate 12 by pressure motor 14 and worm-and-wheel gear 13, finish the vertical pressurization function of 12 pairs of test specimens of lower supporting plate.
Simultaneously, be fixed with torque motor 5 at the top of environment temperature case 2, the top board of reaction frame 3 is fixed with bearing 7, bearing 7 is provided with step axle 6, the input end of step axle 6 is connected by shaft coupling with torque motor 5 output shafts, the output terminal of step axle 6 is connected by flange with an end of disc type torque sensor 8, and the other end of moment of torsion disc type torque sensor 8 is connected by flange with the upper end of transition axis 9, and the lower end of transition axis 9 is fixing with the upper backup pad 10 that is used for clamping test pieces.Can drive upper backup pad 10 by torque motor 5 and horizontally rotate, thereby realize test specimen is loaded the horizontal torsion shear load.If easy torsion shear test device can not have environment temperature case 2 yet, torque motor 5 directly is fixed on the reaction frame 3, and torque motor 2 output shafts connect disc type torque sensor 8 downwards successively and are used for the upper backup pad 10 of clamping test pieces.
In the present embodiment, pressure motor 14 and torque motor 5 are respectively stepper motor, and by computer control, simultaneous computer is also realized the temperature of environment temperature case 2 is set and control, and wherein temperature sensor 4 is arranged on the top of environment temperature case 2.In addition, computer interface connects temperature sensor 4, disc type torque sensor 8 and pressure transducer 12 respectively, in real time temperature, moment of torsion and waveform, the pressure data in the acquisition test process.
With reference to Fig. 2, be the holding ring structure.Holding ring 15 is fixed respectively on the upper and lower back up pad 10,12, and the cross section of holding ring 15 is L shaped, and its horizontal sides and back up pad are fixed, and the inwall of its vertical edge is provided with rubber blanket 16, is convenient to clamp test specimen, prevents slippage.
Utilize the torsion shear test device of present embodiment can realize asphalt torsional shear failure test, asphalt torsional shear creep test respectively, repeat torsion shear test, compound interlayer torsion shear test.
Form the physical dimension that the nominal maximum aggregate size that gathers materials is determined test specimen according to asphalt, the nominal maximum aggregate size that wherein gathers materials is φ 100 * 100mm for the 9.5mm sample dimensions, gather materials nominal maximum aggregate size for the 19mm sample dimensions is φ 150 * 120mm, utilize the gyratory compactor shaping test piece.
The starting pressure motor, the upper backup pad of adjustment clamping test pieces and lower supporting plate are to correct position, test specimen is installed then, with the further fixing test specimen of holding ring, the rubber blanket of the built-in hard of holding ring helps test specimen to be fixed, test specimen slippage when avoiding torsional shear, and be fixed on the test specimen back up pad zero clearing of device load with connecting screw rod, nut.
1) asphalt torsional shear failure test
According to required testing requirements, the environmental cabinet temperature is set, treat test specimen constant temperature 1.5h～2h after, reverse motor horizontal torsion moment be provided, the pressure motor applies Vertical Load.Set test parameters, comprise the Vertical Load of reversing rotating speed of motor, pressure rotating speed of motor and applying, logging: test temperature, Vertical Load, breakdown torque, by disc type torque sensor and pressure transducer, utilize the data of computer real-time acquisition test specimen in the torsional shear destructive process, can transfer data analysis compound influencing Factors on Shear Strength at any time, estimate the shear behavior of asphalt under different temperatures and loading environment.
2) asphalt torsional shear creep test
Asphalt is typical heterogeneous body viscoelastic material, carries out the pavement structure performance that the torsional shear creep test can be used for estimating asphalt well, estimates the rut and the permanent strain performance of pitch asphalt.
In the torsional shear creep test,, reverse motor by computer control according to environment temperature and the Vertical Load that testing requirements is set, test specimen is applied the level constant moment of torsion, disc type torque sensor is gathered the torsional displacement data in real time, and is stored in the Computer Database constant-torque
M c Value is as follows:
M c =κ×
M S
M c -torsional shear creep load, N.m;
M S -torsional shear breakdown strength, N.m;
κ-creep coefficient, 0＜κ＜0.5.
The torsional shear creep test can reflect the tangible viscosity property of asphalt, estimates asphalt in the moulding distortion and the rate of deformation that continue under the load action.
3) repeat torsion shear test
Under environment temperature of setting and vertical loading environment, reverse motor by computer control, test specimen is repeated to apply torsion load, loading frequency and waveform are chosen according to testing requirements, can be waveforms such as semisinusoidal, sawtooth, the load crest value
M R Value is as follows:
M R =γ×
M S
M R -repetition torsion load crest value, N.m;
M S -torsional shear breakdown strength, N.m;
γ-loading coefficient, 0＜γ＜1.
By test, can obtain different detrusion and the vertical deformations of shearing under the number of times of asphalt, analysis environments temperature, Vertical Load are to the influence of shearing deformation and vertical deformation accumulation, estimate the ability of the anti-permanent shearing deformation of asphalt, simulate the different wheel load preferably and act on bituminous pavement repeatedly, test obtains the high temperature stability performance that every index can reflect asphalt preferably.
4) compound interlayer torsion shear test
For the interlayer torsion shear test, at molded good rut plate (core boring sampling among 30cm * 30cm * 5cm), cut into φ 100 * 3cm test specimen, on two test specimen surfaces tack coat is set, couple becomes one group of test specimen, the starting pressure motor, adjust the gap between upper backup pad and the lower supporting plate, test specimen is installed, confirmed test parameter: test temperature, Vertical Load, horizontal torsion shear rate, disc type torque sensor is gathered load and the deformation data of test specimen in the torsional shear destructive process in real time, for the design of compound interlayer materials provides strong test basis.
Although below in conjunction with the accompanying drawings embodiment of the present utility model is described, the utility model is not limited to above-mentioned specific embodiments and applications field, and above-mentioned specific embodiments only is schematic, guiding, rather than restrictive.Those of ordinary skill in the art under the situation that does not break away from the scope that the utility model claim protected, can also make a variety of forms under the enlightenment of this instructions, these all belong to the row of the utility model protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011201633342U CN202066761U (en) | 2011-05-20 | 2011-05-20 | Torsion shear test device used for bituminous pavement materials and structure |
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| CN2011201633342U CN202066761U (en) | 2011-05-20 | 2011-05-20 | Torsion shear test device used for bituminous pavement materials and structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297812A (en) * | 2011-05-20 | 2011-12-28 | 长安大学 | Torsional shear test device for asphalt pavement material and structure |
| CN103994919A (en) * | 2014-04-25 | 2014-08-20 | 南京航空航天大学 | Environment-temperature-controllable small tension-torsion integrated experiment system |
| CN104165809A (en) * | 2014-08-04 | 2014-11-26 | 常熟市环境试验设备有限公司 | Cable torsion test device |
| CN105954119A (en) * | 2016-06-22 | 2016-09-21 | 大连理工大学 | Static three-axis torsion shearing destructive property testing device of asphalt mixture |
| CN106680117A (en) * | 2016-06-02 | 2017-05-17 | 山东大学（威海） | Novel sheet metal torsion testing machine |
| CN108801905A (en) * | 2018-05-24 | 2018-11-13 | 长安大学 | A method of evaluation semi-rigid asphalt pavement penetrated oil construetion technological effect |
| CN110261076A (en) * | 2019-04-22 | 2019-09-20 | 青岛东方船研深海装备结构技术有限公司 | A kind of multi-environment fatigue experimental device of novel flat-plate sample and test method |
| CN110411860A (en) * | 2019-07-04 | 2019-11-05 | 广州大学 | An asphalt pavement structure interlayer shear test device and test method |
| CN111157361A (en) * | 2020-01-06 | 2020-05-15 | 中国矿业大学 | A torsion shear test machine matched with a CT scanner and a method of using the same |
| CN112033824A (en) * | 2020-08-31 | 2020-12-04 | 宁波耀泰电器有限公司 | Torsion tester and torsion testing method thereof |
-
2011
- 2011-05-20 CN CN2011201633342U patent/CN202066761U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297812A (en) * | 2011-05-20 | 2011-12-28 | 长安大学 | Torsional shear test device for asphalt pavement material and structure |
| CN103994919A (en) * | 2014-04-25 | 2014-08-20 | 南京航空航天大学 | Environment-temperature-controllable small tension-torsion integrated experiment system |
| CN104165809A (en) * | 2014-08-04 | 2014-11-26 | 常熟市环境试验设备有限公司 | Cable torsion test device |
| CN106680117A (en) * | 2016-06-02 | 2017-05-17 | 山东大学（威海） | Novel sheet metal torsion testing machine |
| CN105954119A (en) * | 2016-06-22 | 2016-09-21 | 大连理工大学 | Static three-axis torsion shearing destructive property testing device of asphalt mixture |
| CN105954119B (en) * | 2016-06-22 | 2018-08-07 | 大连理工大学 | A kind of static three axis torsional shear destructive characteristics experimental rigs of asphalt |
| CN108801905A (en) * | 2018-05-24 | 2018-11-13 | 长安大学 | A method of evaluation semi-rigid asphalt pavement penetrated oil construetion technological effect |
| CN108801905B (en) * | 2018-05-24 | 2020-11-13 | 长安大学 | A method for evaluating the effect of semi-rigid base asphalt pavement penetration oil construction technology |
| CN110261076A (en) * | 2019-04-22 | 2019-09-20 | 青岛东方船研深海装备结构技术有限公司 | A kind of multi-environment fatigue experimental device of novel flat-plate sample and test method |
| CN110411860A (en) * | 2019-07-04 | 2019-11-05 | 广州大学 | An asphalt pavement structure interlayer shear test device and test method |
| CN110411860B (en) * | 2019-07-04 | 2022-05-10 | 广州大学 | Interlaminar shear test device and method for asphalt pavement structure |
| CN111157361A (en) * | 2020-01-06 | 2020-05-15 | 中国矿业大学 | A torsion shear test machine matched with a CT scanner and a method of using the same |
| CN112033824A (en) * | 2020-08-31 | 2020-12-04 | 宁波耀泰电器有限公司 | Torsion tester and torsion testing method thereof |
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Owner name: QINGHAI RESEARCH INSTITUTE OF TRANSPORTATION Effective date: 20120109 |
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| CB03 | Change of inventor or designer information |
Inventor after: Li Zuzhong Inventor after: Chen Shuanfa Inventor after: Fang Jianhong Inventor after: Xu Anhua Inventor after: Xiong Rui Inventor after: Yue Dan Inventor after: Yao Yunshi Inventor after: Yuan Ruixing Inventor before: Li Zuzhong Inventor before: Chen Shuanfa Inventor before: Fang Jianhong Inventor before: Xiong Rui Inventor before: Yue Dan Inventor before: Yao Yunshi Inventor before: Yuan Ruixing |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI ZUZHONG CHEN SHUANFA FANG JIANHONG XIONG RUI YUE DAN YAO YUNSHI YUAN RUIXING TO: LI ZUZHONG CHEN SHUANFA FANG JIANHONG XU ANHUA XIONG RUI YUE DAN YAO YUNSHI YUAN RUIXING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20120109 Address after: 710064 Xi'an Province, South Second Ring Road Co-patentee after: Qinghai Traffic Science Institute Patentee after: Changan Univ. Address before: 710064 Xi'an Province, South Second Ring Road Patentee before: Changan Univ. |
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Granted publication date: 20111207 Termination date: 20120520 |