CN104819895A - Asphalt mixed material tensile dynamic modulus test device - Google Patents
Asphalt mixed material tensile dynamic modulus test device Download PDFInfo
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- CN104819895A CN104819895A CN201510229228.2A CN201510229228A CN104819895A CN 104819895 A CN104819895 A CN 104819895A CN 201510229228 A CN201510229228 A CN 201510229228A CN 104819895 A CN104819895 A CN 104819895A
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Abstract
The invention discloses an asphalt mixed material tensile dynamic modulus test device which includes a base and a loading support. The base is in a rigid frame structure and includes, from bottom to top successively, a pedestal, a pedestal column and a horizontal cross beam. A support column of the loading support passes vertically through and is slidingly matched with the horizontal cross beam. When the loading support is pressed, an asphalt mixed material cylindrical test piece is stretched. In the invention, on the basis of a loading device, a moulding die and a test method which are general in a uniaxial compression dynamic modulus test device in the prior art, a loading force being vertically downward is converted to a tensile force on the asphalt mixed material cylindrical test piece, so that the tensile dynamic modulus of the asphalt mixed material is tested. On the basis of the test device, the actually measured dynamic modulus of the asphalt mixed material under a tensile situation can be performed, thereby providing test basis on researching of stress state analysis and fatigue failure mechanism of the asphalt mixed material in the application of pavements.
Description
Technical field
The invention belongs to field of road, be specifically related to a kind of test unit testing asphalt dynamic modulus in a stretched state.
Background technology
The material parameter of bituminous pavement is a key factor of bituminous pavement design, and the current bituminous pavement design of China mainly adopts statics to design.But asphalt pavement structure is in use subject to the effect constantly changed from factors such as vehicle, weather, humanities.Its actual working state is that mechanical model or material character all have larger gap with existing statics system.Propose in the research general report of Ministry of Communications's Design Indexes of Asphalt Pavement and parameter systematically to carry out material dynamic performance research and Dynamic Parameters Testing, replace static parameter by dynamic parameter gradually.In this context, the research of recent year to bituminous pavement design MATERIALS ' DYNAMIC design parameter gets more and more, and researcher has carried out a series of research to the dynamic modulus Changing Pattern of asphalt and principal curve thereof, achieves certain achievement.China " highway engineering pitch and Asphalt Mixture Experiment code " (JTGE20-2011) is with reference to U.S. ASTM D3497, AASHTO TP62-03 code test, " test of asphalt uniaxial compression dynamic modulus " (T0738-2011) has been write, for measuring the uniaxial compression dynamic modulus in the online viscoelastic range of asphalt in conjunction with China's actual tests situation.
Then existing specification and test method are all test the dynamic modulus under Material compression state, and bituminous pavement in use, and part ground surface material will bear tension, thus cause the generation of crack disease.Asphalt intensity in a compressed state, is provided jointly by the cohesive strength of bituminous cements and the inner frictional resistance between gathering materials; And the intensity under tension state, then depend primarily on the cohesive strength of bituminous cements.Therefore only study compressive state, be difficult to describe the mechanical characteristics of asphalt under dynamic loads effect comprehensively.Therefore, design a kind of test method of invention and device, Dynamic Modulus of Asphalt Mixture under extended state is measured and studied, be conducive to the Dynamic mechanical property comprehensively describing asphalt, for the foundation of asphalt mechanic constitutive model, the research of numerical simulation, the scientific researches such as the analysis of distress mechanism and engineering field, equal tool is of great significance.
Summary of the invention
The object of the invention is to design and develop a kind of test unit that can measure Dynamic Modulus of Asphalt Mixture under extended state, for the dynamic mechanical under Research on Asphalt Mixture extended state.
Execute stressed performance according to loading equipemtn to be better than applying this feature of performance of pulling force, the present invention devises test battery device, and the pressure straight down that loading equipemtn can be provided is converted into the tensile force to asphalt cylinder specimen.By adopting the load mode identical with " asphalt uniaxial compression dynamic modulus is tested " (T0738-2011), just institute's applied pressure can be converted into tensile force, thus measure the dynamic modulus under asphalt extended state.
The technical solution adopted in the present invention is:
A kind of asphalt stretching dynamic modulus test unit, comprise pedestal and load support, described pedestal is rigid frame structure, and described pedestal is followed successively by base, pedestal upright post and horizontal gird from top to bottom; Described base is fixed on hydraulic test worktable, and described pedestal upright post is located on base, and described horizontal gird is fixed on the upper end of pedestal upright post; The bracket upright post of described loading support is vertically passed described horizontal gird and slidably coordinates with horizontal gird; The first ring flange is fixed with in the bottom of described horizontal gird; The second ring flange is fixed with in the lower end of the bracket upright post loading support; The upper end of asphalt cylinder specimen is fixed with the first anchoring flange dish, lower end is fixed with the second anchoring flange dish; First anchoring flange dish is anchored in the lower end of the first ring flange, the second anchoring flange dish is anchored in the upper end of the second ring flange; When press down load support time, the first described ring flange and the second ring flange mutually away from, asphalt cylinder specimen is stretched.
Further, the first described anchoring flange dish is by the lower end of bolt anchoring in the first ring flange, and the second described anchoring flange dish is by the upper end of bolt anchoring in the second ring flange.
Wherein, described base is a diameter is 330mm annulus.
Further, spacing hole being set in the both sides of base, for utilizing bolt, base being fixed on hydraulic test worktable.
Base arranges three pedestal upright post, and be separated by respectively on base 120 ° of angles of pedestal upright post are arranged.
Horizontal gird arranges circular hole, passes for the bracket upright post loading support.
Wherein, described asphalt cylinder specimen is the right cylinder adopting gyratory compaction molding 150mm diameter, then utilizes and bores core cutting method acquisition diameter 100mm, the cylinder specimen of height 150mm.
Preferably, the two ends of asphalt cylinder specimen all utilize adhesive glue ramming material to be fixed on the first anchoring flange dish and the second anchoring flange dish.
In order to reach the effect of tension and compression conversion, test unit of the present invention is provided with two main members, is base and loading support respectively.Base fixedly occupy on experiment work platform, by pedestal upright post and horizontal gird, the first ring flange of circle is fixed on a certain height; Utilized the upper end of asphalt cylinder specimen adhesive glue ramming material to be fixed on the first anchoring flange dish, and the first ring flange on this first anchoring flange dish and base is utilized the mutual anchoring of bolt, formed overall; The lower end of test specimen utilizes cementitious matter to be fixed on the second anchoring flange dish equally, and the second anchoring flange dish and the second ring flange anchoring loaded in support are integrally.
Pressure puts on and loads on support by loading equipemtn, thus downward power is passed to the lower end of asphalt cylinder specimen; Test specimen upper end, owing to forming entirety with device pedestal, maintains static, and is subject to reacting force upwards; Therefore test specimen presents extended state under load action, thus can further utilize sensor to measure bitumen mixture specimen mechanical behavior in a stretched state, studies its stretching dynamic modulus.
Dynamic Modulus of Asphalt Mixture in existing standard is tested under uniaxial compressed state, is difficult to the dynamic modulus under reflection material extending state.To be that design is a kind of test preferably compatible with uniaxial compression dynamic modulus design concept of the present invention, can test the uniaxial tension dynamic modulus of GENERAL EXPERIMENTATION and loading equipemtn.
Mentality of designing of the present invention uses identical loading equipemtn, and the dynamic loads straight down adopted in being tested by uniaxial compression dynamic modulus is converted into the tensile force to bitumen mixture specimen.In process of the test, except the test unit designed by the present invention, comprise loading equipemtn, sensor, loading force setting, test method, test specimen type etc. all can test with uniaxial compression dynamic modulus and keep completely the same.
Beneficial effect:
The vertically downward pressure of the applying of loading equipemtn can be changed into the tensile force to bitumen mixture specimen by test unit of the present invention, thus tests the stretching dynamic modulus of asphalt.Utilize this test unit, in conjunction with existing uniaxial compression dynamic modulus test method, the dynamic modulus of asphalt under tension and compression state can be measured comprehensively, thus lay the foundation for the mechanical property of thoroughly evaluating asphalt.Meanwhile, for setting up mechanics of materials constitutive model and carrying out simulation analysis, the mechanical response of Research on Asphalt Mixture in actual road surface and failure mechanism, have a very important role.
Utilize special test device of the present invention, can on the basis of the loading equipemtn of complete general existing uniaxial compression dynamic modulus test, mould, test method, loading force is straight down converted into the tensile force to bitumen mixture specimen, thus the stretching dynamic modulus of asphalt is tested.Based on this test unit, can grasp asphalt actual measurement dynamic modulus in a stretched state, thus be the stress state analysis of asphalt in the application of road surface, fatigure failure study mechanism establishes experimental basis.
Accompanying drawing explanation
Fig. 1: the general illustration of asphalt stretching dynamic modulus test unit.
Fig. 2: the front view of asphalt stretching dynamic modulus test unit.
Fig. 3: the vertical view of asphalt stretching dynamic modulus test unit.
Fig. 4: the upward view of asphalt stretching dynamic modulus test unit.
Fig. 5: the schematic diagram of asphalt stretching dynamic modulus test unit base.
Fig. 6: the vertical view of asphalt stretching dynamic modulus test unit base.
Fig. 7: the front view of asphalt stretching dynamic modulus test unit base.
Fig. 8: the upward view of asphalt stretching dynamic modulus test unit base.
Fig. 9: asphalt stretching dynamic modulus test unit loads the schematic diagram of support.
Figure 10: asphalt stretching dynamic modulus test unit loads the vertical view of support.
Figure 11: asphalt stretching dynamic modulus test unit loads the front view of support.
Figure 12: asphalt stretching dynamic modulus test unit loads the upward view of support.
Figure 13: the anchoring flange dish schematic diagram at bitumen mixture specimen two ends.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
A kind of asphalt stretching dynamic modulus test unit, comprise pedestal and load support 1, described pedestal is rigid frame structure, and described pedestal is followed successively by base 11, pedestal upright post 2 and horizontal gird 13 from top to bottom; Described base 11 is fixed on hydraulic test worktable, and described pedestal upright post 2 is established on the pedestal 11, and described horizontal gird 13 is fixed on the upper end of pedestal upright post 2; The bracket upright post 5 of described loading support 1 is vertically passed described horizontal gird 13 and slidably coordinates with horizontal gird 13; The first ring flange 14 is fixed with in the bottom of described horizontal gird 13; The second ring flange 6 is fixed with in the lower end of the bracket upright post loading support; The upper end of asphalt cylinder specimen 8 is fixed with the first anchoring flange dish 9, lower end is fixed with the second anchoring flange dish 15; First anchoring flange dish 9 is anchored in the lower end of the first ring flange, the second anchoring flange dish 15 is anchored in the upper end of the second ring flange 6; When press down load support 1 time, the first described ring flange 14 and the second ring flange 6 mutually away from, asphalt cylinder specimen 8 is stretched.The first described anchoring flange dish is by the lower end of bolt anchoring in the first ring flange, and the second described anchoring flange dish is by the upper end of bolt anchoring in the second ring flange.Described base 11 is a diameter is 330mm annulus.Spacing hole 10 being set in the both sides of base 11, for utilizing bolt, base 11 being fixed on hydraulic test worktable.Base arranges three pedestal upright post 2, and be separated by respectively on the pedestal 11 120 ° of angles of pedestal upright post 2 are arranged.Horizontal gird 13 arranges circular hole, passes for the bracket upright post 5 loading support 1.Described asphalt cylinder specimen 8 is the right cylinder adopting gyratory compaction molding 150mm diameter, then utilizes and bores core cutting method acquisition diameter 100mm, the cylinder specimen of height 150mm.The two ends of asphalt cylinder specimen 8 all utilize adhesive glue ramming material to be fixed on the first anchoring flange dish 9 and the second anchoring flange dish 15.
Loading equipemtn is applied to the vertically downward loading force on load(ing) point 3, is passed to bracket upright post 5 by the rack beam 4 loaded on support 1, be finally passed to load support bottom 1 ring flange 6 on.Apply dynamic load power at load(ing) point 3 place, bracket upright post 5 by the circular hole on base 11, can only and base 11 between form vertical relative motion, ensure that stability therebetween.Loading force is finally passed to the lower end of cylinder specimen 8 by loading support 1, produce downward power to cylinder specimen 8 lower end; Cylinder specimen 8 upper end and pedestal anchoring integrally, maintain static, and therefore make cylinder specimen 8 be in extended state, measure tensile strain and loading force size, just can convert and draw the stretching dynamic modulus of asphalt by a series of sensor.
The present invention's test is developed based on UTM (Universal Test Machine), carries out the size design of test unit according to the test platform of UTM equipment.But this test unit is not limited to UTM, can be applicable to equally on other test platforms.The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention; any those skilled in the art; do not departing within the scope of technical solution of the present invention; according to technical spirit of the present invention, any simple amendment that above embodiment is done, equivalently replace and improve, within the protection domain all still belonging to technical solution of the present invention.
Claims (8)
1. an asphalt stretching dynamic modulus test unit, it is characterized in that: comprise pedestal and load support (1), described pedestal is rigid frame structure, and described pedestal is followed successively by base (11), pedestal upright post (2) and horizontal gird (13) from top to bottom; Described base (11) is fixed on hydraulic test worktable, and described pedestal upright post (2) is located on base (11), and described horizontal gird (13) is fixed on the upper end of pedestal upright post (2); The bracket upright post (5) of described loading support (1) is vertically passed described horizontal gird (13) and slidably coordinates with horizontal gird (13); The first ring flange (14) is fixed with in the bottom of described horizontal gird (13); The second ring flange (6) is fixed with in the lower end of the bracket upright post loading support; The upper end of asphalt cylinder specimen (8) is fixed with the first anchoring flange dish (9), lower end is fixed with the second anchoring flange dish (15); First anchoring flange dish (9) is anchored in the lower end of the first ring flange (14), the second anchoring flange dish (15) is anchored in the upper end of the second ring flange (6); When press down load support (1) time, described the first ring flange (14) and the second ring flange (6) mutual away from, asphalt cylinder specimen (8) is stretched.
2. asphalt stretching dynamic modulus test unit according to claim 1, it is characterized in that: the first described anchoring flange dish (9) is by the lower end of bolt anchoring in the first ring flange (14), and the second described anchoring flange dish (15) is by the upper end of bolt anchoring in the second ring flange (6).
3. asphalt stretching dynamic modulus test unit according to claim 1, is characterized in that: described base (11) is a diameter is 330mm annulus.
4. asphalt stretching dynamic modulus test unit according to claim 1, it is characterized in that: spacing hole (10) is set in the both sides of base (11), for utilizing bolt, base (11) being fixed on hydraulic test worktable.
5. asphalt stretching dynamic modulus test unit according to claim 1, it is characterized in that: on base, arrange three pedestal upright post (2), be separated by respectively on base (11) 120 ° of angles of pedestal upright post (2) are arranged.
6. asphalt stretching dynamic modulus test unit according to claim 1, is characterized in that: on horizontal gird (13), arrange circular hole, passes for the bracket upright post (5) loading support (1).
7. asphalt stretching dynamic modulus test unit according to claim 1, it is characterized in that: described asphalt cylinder specimen (8) is the right cylinder adopting gyratory compaction molding 150mm diameter, then utilize and bore core cutting method acquisition diameter 100mm, the cylinder specimen of height 150mm.
8. asphalt stretching dynamic modulus test unit according to claim 1, is characterized in that: the two ends of asphalt cylinder specimen (8) all utilize adhesive glue ramming material to be fixed on the first anchoring flange dish (9) and the second anchoring flange dish (15).
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| CN201510229228.2A CN104819895A (en) | 2015-05-07 | 2015-05-07 | Asphalt mixed material tensile dynamic modulus test device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203414A (en) * | 2015-09-24 | 2015-12-30 | 长沙理工大学 | Testing method for dynamic modulus of bituminous mixture |
| CN107727503A (en) * | 2017-11-15 | 2018-02-23 | 中国人民解放军陆军工程大学 | Adhesion-free test device and method for direct rock tensile test |
| CN107748106A (en) * | 2017-09-30 | 2018-03-02 | 交通运输部公路科学研究所 | A kind of asphalt stretches dynamic modulus method of testing |
| CN109781528A (en) * | 2019-02-18 | 2019-05-21 | 长安大学 | The device and its application method of swollen effect are cut in test asphalt transition process |
| CN110057672A (en) * | 2019-05-13 | 2019-07-26 | 交通运输部公路科学研究所 | A kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test method |
| CN111257142A (en) * | 2020-01-21 | 2020-06-09 | 辽宁省交通科学研究院有限责任公司 | Method for determining relationship between indirect tensile modulus and uniaxial compression modulus of asphalt mixture |
| CN111735704A (en) * | 2020-08-03 | 2020-10-02 | 矿冶科技集团有限公司 | Mine filling body tensile strength testing device and method |
| CN113125255A (en) * | 2021-03-22 | 2021-07-16 | 株洲时代新材料科技股份有限公司 | Device and method for testing tensile fatigue of embedded part of blade root of wind power blade |
| CN117388075A (en) * | 2023-12-08 | 2024-01-12 | 沧州航天科宇测试仪器有限公司 | Asphalt mixture tensile deformation experimental device |
| CN117634227A (en) * | 2024-01-25 | 2024-03-01 | 佛山市交通科技有限公司 | Method, equipment and medium for predicting tensile-compression fatigue characteristics of reclaimed asphalt mixture |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105203414A (en) * | 2015-09-24 | 2015-12-30 | 长沙理工大学 | Testing method for dynamic modulus of bituminous mixture |
| CN107748106A (en) * | 2017-09-30 | 2018-03-02 | 交通运输部公路科学研究所 | A kind of asphalt stretches dynamic modulus method of testing |
| CN107727503A (en) * | 2017-11-15 | 2018-02-23 | 中国人民解放军陆军工程大学 | Adhesion-free test device and method for direct rock tensile test |
| CN109781528A (en) * | 2019-02-18 | 2019-05-21 | 长安大学 | The device and its application method of swollen effect are cut in test asphalt transition process |
| CN110057672A (en) * | 2019-05-13 | 2019-07-26 | 交通运输部公路科学研究所 | A kind of stabilized with inorganic binder MATERIALS ' DYNAMIC uniaxial direct tensile modulus of resilience test method |
| CN111257142A (en) * | 2020-01-21 | 2020-06-09 | 辽宁省交通科学研究院有限责任公司 | Method for determining relationship between indirect tensile modulus and uniaxial compression modulus of asphalt mixture |
| CN111735704A (en) * | 2020-08-03 | 2020-10-02 | 矿冶科技集团有限公司 | Mine filling body tensile strength testing device and method |
| CN113125255A (en) * | 2021-03-22 | 2021-07-16 | 株洲时代新材料科技股份有限公司 | Device and method for testing tensile fatigue of embedded part of blade root of wind power blade |
| CN117388075A (en) * | 2023-12-08 | 2024-01-12 | 沧州航天科宇测试仪器有限公司 | Asphalt mixture tensile deformation experimental device |
| CN117388075B (en) * | 2023-12-08 | 2024-03-26 | 沧州航天科宇测试仪器有限公司 | Asphalt mixture tensile deformation experimental device |
| CN117634227A (en) * | 2024-01-25 | 2024-03-01 | 佛山市交通科技有限公司 | Method, equipment and medium for predicting tensile-compression fatigue characteristics of reclaimed asphalt mixture |
| CN117634227B (en) * | 2024-01-25 | 2024-05-28 | 佛山市交通科技有限公司 | Method, equipment and medium for predicting tensile-compression fatigue characteristics of reclaimed asphalt mixture |
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Application publication date: 20150805 |