CN103743631A - Torsional shear test method for asphalt mixture - Google Patents
Torsional shear test method for asphalt mixture Download PDFInfo
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- CN103743631A CN103743631A CN201410017686.5A CN201410017686A CN103743631A CN 103743631 A CN103743631 A CN 103743631A CN 201410017686 A CN201410017686 A CN 201410017686A CN 103743631 A CN103743631 A CN 103743631A
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- asphalt mixture
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Abstract
The invention discloses a torsional shear test method for an asphalt mixture. The anti-shear strength and the shear fatigue life of the asphalt mixture are measured in a torsional shear mode. Test devices required by the test method comprise a test platform and a computer-controlled electronic universal testing machine. According to the torsional shear test method for the asphalt mixture, a cylindrical asphalt mixture test piece is broken by torsion (due to the principle that the torsion, which acts on the test piece with a circular cross section, can only produce pure shear deformation, so that the asphalt mixture is positioned in a pure shear simple stress state, and the accuracy of test data can be improved theoretically), and the anti-shear strength and the shear fatigue life of the asphalt mixture can be obtained by analyzing data, so that the anti-shear performance of the asphalt mixture is evaluated.
Description
Technical field
The invention belongs to asphalt mechanical property test field, particularly relate to a kind of asphalt torsion shear test method.
Background technology
About investigation and research show, under the higher condition of temperature, the shear resistance of asphalt is not enough to resist the repeated action of wheel load, makes bituminous concrete produce plasticity detrusion, and is extruded to gradually both sides, thereby produce rut; In the design process of bituminous pavement, do not consider the shear behavior of asphalt.So, the shear behavior of Research on Asphalt Mixture, the performance evaluation to asphalt and the design of bituminous pavement all have a very big significance.
There are some weak parts in current domestic cutting performance experimental technique: in experimentation, test specimen is generally under complex stress active state, and then generation shear failure, although complex stress condition is closer to road surface actual working state, but on destruction face there is inhomogeneous, asymmetric and inharmonic phenomenon in shearing stress distribution, and this will produce certain influence to test accuracy.Meanwhile, domestic shortage is carried out equipment and the method for direct shear test to asphalt.Therefore, in the design process of asphalt, propose a kind of efficient accurate and economical and practical shearing test method and evaluate the shear behavior of asphalt, be significant.
Summary of the invention
For current domestic cutting performance experimental technique, there is the present situation of weak part, take bituminous pavement Stress Field Distribution and environmental effects into consideration, the test of exploitation shearing test method, the present invention can carry out torsion shear test in different environmental baseline (temperature, loading frequency) to different materials.The moment that applies a torsion by test unit to test specimen, test specimen is subject to pure shearing like this, more can simulate the stress state on actual road surface, and is easy to analyze, and meets the sample of many specifications.
The present invention is achieved by a kind of asphalt torsional shear test device.Asphalt torsional shear test device comprises microcomputer controlled electronic universal tester and test platform.Wherein universal testing machine comprises frame, constant temperature oven, base, elevating lever, control device, power system.Test platform forms by testing examination platform, joint, tooth bar, gear, rotating disk, fixed glides and slide plate base, has twice groove on slide base plate, and shaft collar can slide in groove; Test platform is screwed in universal testing machine.
A kind of asphalt torsion shear test method, comprises step:
(1) by the size of determining bitumen mixture specimen, determine disk size.Test specimen diameter 100mm～150mm, height 100mm～150mm.Disk size 105mm～160mm, thickness 30mm;
(2) make bitumen mixture specimen: can pass through static pressure method or gyratory compaction method moulding bitumen mixture specimen, also can pass through on-the-spot core boring sampling;
(3) insulation: bitumen mixture specimen and disk are placed in constant temperature oven and are incubated, and temperature is between 10 degrees Celsius～60 degrees Celsius, and temperature retention time is more than 6 hours;
(4) carry out shearing strength testing experiment: bitumen mixture specimen is bonding by epoxy resin and disk, and a disk is connected with turning axle, and another disk is connected with fixed glides.Universal testing machine is exerted pressure to tooth bar by elevating lever, loading speed is 10mm/min, wheel and rack engagement, and pressure is changed into moment of torsion, and until producing, destroys bitumen mixture specimen, universal testing machine collects data, obtain failing load, can obtain shearing strength, revision test, obtains the shearing strength of mean value as this kind of asphalt.The sense of displacement of bitumen mixture specimen is consistent with shear direction in process of the test;
(5) carry out shear fatigue test: by step (4), obtain failing load, value within the scope of 0.1～0.9 times of failing load, bitumen mixture specimen is repeated to load, by universal testing machine collection, load number of times and deformation data, test of many times is averaged, thereby can obtain the shear fatigue life-span of this asphalt.
By applying moment of torsion, (moment of torsion acting on round section test specimen only can produce pure shear distortion in the present invention, make the Simple stress condition of asphalt in pure shear, can improve in theory the accuracy of test figure), right cylinder bitumen mixture specimen is destroyed, analyze shearing strength and shear fatigue life-span that data can obtain asphalt, thereby evaluate the shear behavior of asphalt.
The present invention is simple to operation, is convenient to promote, practical, can simulate more exactly the actual forced status of bituminous pavement, the great significance for design of the design to cutting performance in blacktop and structure and material and evaluation, brea bed thickness.
Claims (3)
1. an asphalt torsion shear test method, is characterized in that following steps:
(1) by the size of determining bitumen mixture specimen, determine disk size;
(2) make bitumen mixture specimen: can pass through static pressure method or gyratory compaction method moulding bitumen mixture specimen, also can pass through on-the-spot core boring sampling;
(3) insulation: bitumen mixture specimen and disk are placed in constant temperature oven and are incubated;
(4) carry out shearing strength testing experiment: bitumen mixture specimen is bonding by epoxy resin and disk, and a disk is connected with turning axle, and another disk is connected with fixed glides,
?universal testing machine is exerted pressure to tooth bar by elevating lever, loading speed is 10mm/min, wheel and rack engagement, and pressure is changed into moment of torsion, until producing, destroys bitumen mixture specimen, universal testing machine collects data, obtain failing load, can obtain shearing strength, revision test, obtain the shearing strength of mean value as this kind of asphalt
The sense of displacement of bitumen mixture specimen is consistent with shear direction in process of the test,
(5) carry out shear fatigue test: by step (4), obtain failing load, value within the scope of 0.1～0.9 times of failing load, bitumen mixture specimen is repeated to load, by universal testing machine collection, load number of times and deformation data, test of many times is averaged, thereby can obtain the shear fatigue life-span of this asphalt.
2. asphalt torsion shear test method according to claim 1, is characterized in that: test specimen diameter 100mm～150mm in described step (1), height 100mm～150mm, disk size 105mm～160mm, thickness 30mm.
3.. asphalt torsion shear test method according to claim 1, is characterized in that: in described step (4), calorstat temperature is between 10 degrees Celsius～60 degrees Celsius, and temperature retention time is more than 6 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410017686.5A CN103743631A (en) | 2014-01-15 | 2014-01-15 | Torsional shear test method for asphalt mixture |
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| CN201410017686.5A CN103743631A (en) | 2014-01-15 | 2014-01-15 | Torsional shear test method for asphalt mixture |
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| CN103743631A true CN103743631A (en) | 2014-04-23 |
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| CN201410017686.5A Pending CN103743631A (en) | 2014-01-15 | 2014-01-15 | Torsional shear test method for asphalt mixture |
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Cited By (7)
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|---|---|---|---|---|
| CN104913984A (en) * | 2015-05-28 | 2015-09-16 | 福建工程学院 | Pavement material double-layer cylinder specimen compression and torsion combination fatigue test method and device |
| CN105445119A (en) * | 2015-11-13 | 2016-03-30 | 长安大学 | Device and method for testing torsion resistance and shear performance of bituminous mixture |
| CN106404558A (en) * | 2016-08-30 | 2017-02-15 | 江苏中路工程技术研究院有限公司 | Annular shear fatigue test method for asphalt mixture |
| CN106840920A (en) * | 2017-03-14 | 2017-06-13 | 华南理工大学 | A kind of experimental rig and method for thin-layer-asphalt pavement structure rotational shear |
| CN108760615A (en) * | 2018-03-07 | 2018-11-06 | 宁夏大学 | A kind of simulating natural condition bituminous concrete tester |
| CN109520866A (en) * | 2019-01-25 | 2019-03-26 | 河南交院工程技术有限公司 | A kind of compression shear test device |
| CN109580392A (en) * | 2019-01-25 | 2019-04-05 | 河南交院工程技术有限公司 | A kind of hydraulic pressure-shear test machine |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913984A (en) * | 2015-05-28 | 2015-09-16 | 福建工程学院 | Pavement material double-layer cylinder specimen compression and torsion combination fatigue test method and device |
| CN105445119A (en) * | 2015-11-13 | 2016-03-30 | 长安大学 | Device and method for testing torsion resistance and shear performance of bituminous mixture |
| CN105445119B (en) * | 2015-11-13 | 2018-01-12 | 长安大学 | A kind of test device and method of asphalt anti-torsion and cutting performance |
| CN106404558A (en) * | 2016-08-30 | 2017-02-15 | 江苏中路工程技术研究院有限公司 | Annular shear fatigue test method for asphalt mixture |
| CN106840920A (en) * | 2017-03-14 | 2017-06-13 | 华南理工大学 | A kind of experimental rig and method for thin-layer-asphalt pavement structure rotational shear |
| CN106840920B (en) * | 2017-03-14 | 2023-12-22 | 华南理工大学 | Test device and method for rotary shearing of thin-layer asphalt pavement structure |
| CN108760615A (en) * | 2018-03-07 | 2018-11-06 | 宁夏大学 | A kind of simulating natural condition bituminous concrete tester |
| CN108760615B (en) * | 2018-03-07 | 2024-04-16 | 宁夏大学 | Asphalt concrete tester simulating natural conditions |
| CN109520866A (en) * | 2019-01-25 | 2019-03-26 | 河南交院工程技术有限公司 | A kind of compression shear test device |
| CN109580392A (en) * | 2019-01-25 | 2019-04-05 | 河南交院工程技术有限公司 | A kind of hydraulic pressure-shear test machine |
| CN109580392B (en) * | 2019-01-25 | 2023-08-25 | 河南交通职业技术学院 | Hydraulic pressure shear test machine |
| CN109520866B (en) * | 2019-01-25 | 2023-12-12 | 河南交通职业技术学院 | Pressure shear test device |
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Application publication date: 20140423 |