CN103149085A - Asphalt pavement structure shear test fixture - Google Patents
Asphalt pavement structure shear test fixture Download PDFInfo
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- CN103149085A CN103149085A CN2013100462788A CN201310046278A CN103149085A CN 103149085 A CN103149085 A CN 103149085A CN 2013100462788 A CN2013100462788 A CN 2013100462788A CN 201310046278 A CN201310046278 A CN 201310046278A CN 103149085 A CN103149085 A CN 103149085A
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Abstract
Belonging to the technical field of test fixtures, the invention particularly relates to an asphalt pavement structure shear test fixture for shear performance testing of asphalt layers and interlayers in a semi-rigid and flexible base asphalt pavement structure and a composite asphalt pavement structure. The shear test fixture comprises a test platform support, a test piece fixation plate and a test piece shear plate. The test platform support is connected to the test piece fixation plate, and the bottom of the test platform support is provided with sensor supports. The test piece shear plate matches with the test platform support through a clamping groove. Fastening screws are mounted on the test platform support outer sides opposite to the clamping groove. The top middle of the test piece shear plate is provided with a positioning screw. The test piece fixation plate and the test piece shear plate are respectively provided with a test piece mounting hole, which is outwardly provided with a test piece mounting cylinder. Two lateral outer walls of the test piece mounting cylinder is correspondingly equipped with boss bodies provided with sensor mounting holes. And outer lateral parts of the boss bodies are provided with sensor fixation screws.
Description
Technical field
The invention belongs to the test fixture technical field, particularly relate to a kind of for semi-rigid and asphalt pavements with flexible bases, composite asphalt pavement structure, the asphalt pavement structure shear test fixture of the experiment on Shearing Resistance of brea bed and interlayer.
Background technology
In the existing highway of China, bituminous pavement is the principal mode of express highway pavement.Meanwhile, the rut of bituminous pavement is also the topmost pavement disease form of highway with cracking.Studies show that in a large number, the shear failure of bituminous concrete and interlayer junction is to cause the main cause of rut and the cracking on road surface.Yet the test instrument of existing various evaluate and analyze asphalt concrete shearing performances is subject to the impact of test fixture, all can not effectively measure the shearing strength of road surface core layers of material and interlayer.
Existing most of road mechanics test instrument, the test fixture that uses mostly structure is heavy, for the requirement of test specimen, many restrictions is often arranged, when carrying out shear test, the size of test specimen is all thinner, causes testing preferably the destruction situation the when road surface is actual is cut.In shear history, the impact of the material of fixture that is put to the test own, the deflection of test fixture usually can be very large.And the shearing force that applies in test shear surface common and test specimen has certain angle, like this shear surface produces shear stress except meeting, also can produce simultaneously the normal stress perpendicular to shear surface, this bituminous pavement shear resistance that just makes test obtain is bigger than normal, is not inconsistent with actual value.
Summary of the invention
For the problem that prior art exists, the invention provides a kind of simple in structure, intensity is large, lightweight, the test findings deviation is little and the less asphalt pavement structure shear test fixture of distortion in shear history.
To achieve these goals, the present invention adopts following technical scheme: a kind of asphalt pavement structure shear test fixture, comprise testing table bearing, test specimen fixed head and test specimen shear plate, be connected by screw bolt and nut between described testing table bearing and test specimen fixed head, be provided with sensor support base in the bottom of testing table bearing; Described test specimen shear plate and testing table bearing match by the draw-in groove of testing table bearing inboard; On the lateral surface of the testing table bearing relative with draw-in groove, trip bolt is installed, described trip bolt matches with the test specimen shear plate; Top middle portion at described test specimen shear plate is provided with dog screw; Be equipped with the test specimen placed hole on described test specimen fixed head and test specimen shear plate, lay cylinder to being outside equipped with test specimen on the test specimen placed hole; Lay at described test specimen that on the both sides outer wall of cylinder, correspondence is provided with the boss body, be provided with the installation of sensors hole on the boss body, the sensor gib screw that matches with the installation of sensors hole is installed at the external sidepiece of boss.
Described test specimen shear plate adopts the light aluminum alloy material.
Beneficial effect of the present invention:
1, the present invention compares with existing test fixture, select light aluminum alloy on the material of test specimen shear plate, the test specimen shear plate is all increased on strength and stiffness to some extent, guaranteed load transitivity good in the process of the test, also can avoid not cutting first disconnected situation because of the excessive test specimen that causes of test specimen shear plate deadweight in process of the test and occur.
2, the present invention compares with existing test fixture, structurally installs simply, and is easy to use, wider to the scope of application of test specimen, and the test findings deviation is less.
Description of drawings
Fig. 1 is a kind of asphalt pavement structure shear test clamp structure schematic diagram of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the side view of Fig. 1;
In figure, 1-dog screw, 2-test specimen shear plate, 3-testing table bearing, 4-sensor gib screw, 5-sensor support base, 6-test specimen placed hole, 7-nut, 8-spring washer, 9-bolt, 10-positioning baffle screw, 11-trip bolt, 12-positioning baffle, 13-binding clip, 14-installation of sensors hole, 15-boss body, 16-test specimen fixed head, 17-draw-in groove, 18-test specimen is laid cylinder.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, 2, 3, a kind of asphalt pavement structure shear test fixture, comprise testing table bearing 3, test specimen fixed head 16 and test specimen shear plate 2, be connected with nut 7 by bolt 9 between described testing table bearing 3 and test specimen fixed head 16, between testing table bearing 3 and test specimen fixed head 16, binding clip 13 is installed, be provided with spring washer 8 on the bolt 9 between nut 7 and testing table bearing 3, be provided with sensor support base 5 in the bottom of testing table bearing 3; Described test specimen shear plate 2 and testing table bearing 3 match by the draw-in groove 17 of testing table bearing 3 inboards; On the lateral surface of the testing table bearing 3 relative with draw-in groove 17, trip bolt 11 is installed, described trip bolt 11 matches with test specimen shear plate 2; In order to limit test specimen shear plate 2 moving left and right in draw-in groove 17, by positioning baffle screw 10, positioning baffle 12 is installed on test specimen shear plate 2, positioning baffle 12 is installed near testing table bearing 3 medial surfaces; Top middle portion at described test specimen shear plate 2 is provided with dog screw 1; Be equipped with test specimen placed hole 6 on described test specimen fixed head 16 and test specimen shear plate 2, lay cylinder 18 to being outside equipped with test specimen on test specimen placed hole 6; Described test specimen is laid cylinder 18 and is set to cylindrical structural; Lay at described test specimen that on cylinder 18 both sides outer wall, correspondence is provided with boss body 15, be provided with installation of sensors hole 14 on boss body 15, the sensor gib screw 4 that matches with installation of sensors hole 14 is installed in boss body 15 outside portions.
In process of the test, because the deadweight of test specimen shear plate 2 is excessive, cause test specimen not cut first disconnected, described test specimen shear plate 2 adopts the light aluminum alloy material.
Below in conjunction with a description of drawings use procedure of the present invention:
As shown in Figure 1, 2, 3, before beginning test, at first testing table bearing 3 of the present invention is installed on the tester testing table of asphalt mechanical index test macro LMT-3, then test specimen fixed head 16 is installed on testing table bearing 3.Install test specimen shear plate 2 by draw-in groove 17 this moment, the position of adjustment test specimen shear plate 2 in draw-in groove 17, make on test specimen placed hole 6 and the test specimen fixed head 16 on test specimen shear plate 2 test specimen placed hole 6 both be adjusted into one heart, then by trip bolt 11, test specimen shear plate 2 is fixed in draw-in groove 17.The sensor that installation test is used, sensor are the digital display dial gauge of model SXB151A, by installation of sensors hole 14, sensor are placed on sensor support base 5, screw sensor gib screw 4, and sensor is fixed on sensor support base 5.
Begin test, select the test test specimen, test specimen is selected the road surface core of diameter 100mm or 150mm, also can select the laboratory shaping test piece.The test specimen that chooses is placed in test specimen lays in cylinder 18, unclamp trip bolt 11 this moment, allows test specimen shear plate 2 freely glide draw-in groove 17 is interior, until with the test specimen close contact.At this moment, tester can be to dog screw 1 imposed load on test specimen shear plate 2 tops, and by test specimen shear plate 2 with load applying to test specimen, 2 pairs of test specimens of test specimen shear plate this moment produce shear stresses, until till test specimen generation shear failure, off-test.
Log, and to consider the deadweight of test specimen shear plate 2 when calculating test findings.
The present invention can also be arranged in the testing equipment with servo-drive system and environmental cabinet and use.
Claims (2)
1. asphalt pavement structure shear test fixture, it is characterized in that: comprise testing table bearing, test specimen fixed head and test specimen shear plate, be connected by screw bolt and nut between described testing table bearing and test specimen fixed head, be provided with sensor support base in the bottom of testing table bearing; Described test specimen shear plate and testing table bearing match by the draw-in groove of testing table bearing inboard; On the lateral surface of the testing table bearing relative with draw-in groove, trip bolt is installed, described trip bolt matches with the test specimen shear plate; Top middle portion at described test specimen shear plate is provided with dog screw; Be equipped with the test specimen placed hole on described test specimen fixed head and test specimen shear plate, lay cylinder to being outside equipped with test specimen on the test specimen placed hole; Lay at described test specimen that on the both sides outer wall of cylinder, correspondence is provided with the boss body, be provided with the installation of sensors hole on the boss body, the sensor gib screw that matches with the installation of sensors hole is installed at the external sidepiece of boss.
2. a kind of asphalt pavement structure shear test fixture according to claim 1, is characterized in that: described test specimen shear plate employing light aluminum alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100462788A CN103149085A (en) | 2013-02-05 | 2013-02-05 | Asphalt pavement structure shear test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100462788A CN103149085A (en) | 2013-02-05 | 2013-02-05 | Asphalt pavement structure shear test fixture |
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| Publication Number | Publication Date |
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| CN103149085A true CN103149085A (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013100462788A Pending CN103149085A (en) | 2013-02-05 | 2013-02-05 | Asphalt pavement structure shear test fixture |
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| CN (1) | CN103149085A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596292A (en) * | 2016-12-14 | 2017-04-26 | 哈尔滨工业大学 | Interlayer direct shearing testing device for pavement material |
| CN109115633A (en) * | 2018-10-26 | 2019-01-01 | 兰州理工大学 | A kind of asphalt layer room machine frictional strength test device and method |
| CN112432850A (en) * | 2020-11-16 | 2021-03-02 | 河海大学 | Three-way independent loading novel mixed boundary true triaxial apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201199223Y (en) * | 2008-03-24 | 2009-02-25 | 山东省交通科学研究所 | Portable tester for interlayer cementing straight scissors for highway |
| CN102095680A (en) * | 2010-12-30 | 2011-06-15 | 中交第一公路勘察设计研究院有限公司 | Clamp and method for testing pavement interlayer shear fatigue test piece |
| CN102830016A (en) * | 2012-08-27 | 2012-12-19 | 西安科技大学 | Testing method of shear strength and shear fatigue of pavement material and testing device of such method |
| CN203132915U (en) * | 2013-02-05 | 2013-08-14 | 辽宁省交通科学研究院 | Asphalt pavement structure shearing test clamp |
-
2013
- 2013-02-05 CN CN2013100462788A patent/CN103149085A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201199223Y (en) * | 2008-03-24 | 2009-02-25 | 山东省交通科学研究所 | Portable tester for interlayer cementing straight scissors for highway |
| CN102095680A (en) * | 2010-12-30 | 2011-06-15 | 中交第一公路勘察设计研究院有限公司 | Clamp and method for testing pavement interlayer shear fatigue test piece |
| CN102830016A (en) * | 2012-08-27 | 2012-12-19 | 西安科技大学 | Testing method of shear strength and shear fatigue of pavement material and testing device of such method |
| CN203132915U (en) * | 2013-02-05 | 2013-08-14 | 辽宁省交通科学研究院 | Asphalt pavement structure shearing test clamp |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106596292A (en) * | 2016-12-14 | 2017-04-26 | 哈尔滨工业大学 | Interlayer direct shearing testing device for pavement material |
| CN109115633A (en) * | 2018-10-26 | 2019-01-01 | 兰州理工大学 | A kind of asphalt layer room machine frictional strength test device and method |
| CN109115633B (en) * | 2018-10-26 | 2020-11-06 | 兰州理工大学 | Device and method for testing mechanical friction resistance between asphalt surface layers |
| CN112432850A (en) * | 2020-11-16 | 2021-03-02 | 河海大学 | Three-way independent loading novel mixed boundary true triaxial apparatus |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20130612 |