CN203025051U - Asphalt mixture bending shear performance test device - Google Patents
Asphalt mixture bending shear performance test device Download PDFInfo
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- CN203025051U CN203025051U CN 201220739594 CN201220739594U CN203025051U CN 203025051 U CN203025051 U CN 203025051U CN 201220739594 CN201220739594 CN 201220739594 CN 201220739594 U CN201220739594 U CN 201220739594U CN 203025051 U CN203025051 U CN 203025051U
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- air bag
- interior air
- test specimen
- performance test
- asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 51
- 238000011056 performance test Methods 0.000 title claims abstract description 22
- 238000005452 bending Methods 0.000 title abstract description 11
- 239000000203 mixture Substances 0.000 title abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 83
- 238000004154 testing of material Methods 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 12
- 238000010008 shearing Methods 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000001066 destructive effect Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides an asphalt mixture bending shear performance test device, includes MTS material testing machine and bending shear performance test mould, still includes interior gasbag subassembly, bending shear performance test mould is equipped with cylindrical groove, cylindrical groove inboard is equipped with annular ladder, cylindrical groove's internal diameter equals the external diameter of ring shape test piece, interior gasbag of interior gasbag subassembly install in the hole of ring shape test piece and with the surface in close contact with of hole, interior gasbag subassembly is provided atmospheric pressure by the air pressure device, the bottom support of bending shear performance test mould is on the examination mould bracing piece of MTS material testing machine, annular pressure head is connected with the lower pressure arm of MTS material testing machine, provides the load for the upper surface of ring shape test piece, the utility model discloses simple and easy, the facilitate promotion, can fine evaluation asphalt mixture to the bending tensile stress and the resistance of shearing stress combined action, but also can better simulate the bending and shearing combined damage form of the pavement, and has important significance for preventing and controlling the damage of the asphalt pavement and designing the structure of the asphalt pavement.
Description
Technical field
The utility model belongs to road engineering field, particularly a kind of asphalt curved scissors performance test apparatus.
Background technology
Since reform and opening-up, highway is maximum, the with the fastest developing speed field of focusing the consruction on of China's year dynamics of investment always; By the end of the year 2012, the built highway that is open to traffic of China occupies the second place of the world, is wherein bituminous pavement more than 90%.According to the development plan construction, following 2 years, China's highway total kilometrage was expected to surpass the U.S., becomes the first in the world; After this also want newly-built tens thousand of kilometers highways and gigameter common road in the more than ten years, the bituminous pavement of the millions of kilometers transformation that needs repairing is more arranged.
China has accumulated rich experience, has solved many key technical problems in the Construction Practice on asphalt for high grade road road surface.But from the bituminous pavement behaviour in service that has put into effect in recent years, major part does not reach and tenure of use namely occurred more serious function decay and structural failure, many design periods are the bituminous pavement of 15 years, namely occur in 5～8 years destroying on a large scale after open to traffic, caused huge economic loss and bad social influence.
The a large amount of earlier period damages of bituminous pavement can not be simply owing to construction quality and Reasons of Overload, and the system of design of material exists obvious deficiency and also is one of its key factor.At present, the parameter of sign asphalt mechanical strength mainly contains: compressive strength, tensile strength and shearing strength.General asphalt has higher compressive strength, and shearing strength and tensile strength are lower.Existing studies show that, the damage of bituminous pavement are begun by drawing crack or shearing slip and expansion gradually often.In order to prevent the asphalt failure, usually adopt bending test, diametral compression test and triaxial test and measure respectively Tensile strength and shearing strength, and characterize the mechanical characteristics of asphalt with these intensive parameters.Existing studies show that, under the combined action of wheel horizontal loading and vertical load, in asphalt pavement structure, each point is in different stress-strain states, and asphalt mat the most easily produces the curved scissors combination and destroys.Yet, in the Asphalt Mixture Design process, but estimate the tensile property of asphalt by bending test or diametral compression test, and estimated the shear behavior of asphalt by triaxial test.In bending test, the effect that asphalt only is subject to flexural tensile stress occur curved pull open bad; In triaxial test, asphalt only is subject to the effect generation shear failure of shear stress.Although above-mentioned test method has been considered respectively the destruction that tension and shear stress cause asphalt, can't the effective evaluation tension and shear stress comprehensive destruction that asphalt is caused.Existing Strength Testing Methods can't be estimated the intensity of asphalt under tension and shear stress acting in conjunction, has been asphalt Strength Testing Methods problem demanding prompt solution.
The utility model content
The purpose of this utility model is to overcome the deficiency of prior art and provides a kind of simple, is convenient to promote, and can measure asphalt curved scissors combined strength, asphalt curved scissors performance test apparatus that again can simulated roadway curved scissors combination destructive characteristics.
a kind of asphalt curved scissors performance test apparatus, comprise MTS Material Testing Machine and curved scissors performance test mould, also comprise interior air bag component, described curved scissors performance test mould is provided with cylinder shape groove, described cylinder shape groove inboard is provided with ring ladder, the internal diameter of described cylinder shape groove equals the external diameter of annular test specimen, the interior air bag of described interior air bag component be installed in the endoporus of annular test specimen and and the surperficial close contact of described endoporus, described interior air bag component provides air pressure by pneumatic shuttle, be provided with circumferential collar on the ring ladder of described cylinder shape groove inboard, described annular test specimen is placed on described circumferential collar, the top of described annular test specimen is pressed on described annular test specimen on described ring ladder by pressure ring, also be provided with ring washer between described pressure ring and described annular test specimen, the bottom support of described curved scissors performance test mould is on the die trial support bar of described MTS Material Testing Machine, described annular pressure head is connected with the lower pressure arm of described MTS Material Testing Machine, for the upper surface of described annular test specimen provides load.
described interior air bag component comprises interior air bag gaseous core, interior air bag stationary installation and interior air bag rubber diaphragm, described interior air bag gaseous core one end is provided with air intake opening, the bottom is provided with the gas outlet, described interior air bag rubber diaphragm is hollow cylindrical tube, the diameter of the film formed hollow cylinder of described interior air bag rubber is equal to or less than the diameter of described annular test specimen endoporus, described interior air bag stationary installation comprises set nut, air bag cap and airbag cover, described interior air bag Rubber membrane cover is contained in outside described interior air bag gaseous core and the two ends of described interior air bag rubber diaphragm are fixed on the two ends of described interior air bag gaseous core by described set nut, make and form interior air bag between described interior air bag rubber diaphragm and described interior air bag gaseous core, described air bag cap and airbag cover are arranged on described interior air bag gaseous core, the diameter of described air bag cap and airbag cover is greater than the diameter of described annular test specimen endoporus, make described interior air bag be fixed in described annular test specimen endoporus, the gas outlet of described interior air bag gaseous core is communicated with described interior air bag.
Described circumferential collar is corresponding with the position of described ring washer.
Groove is carved with on the surface of described ring washer and circumferential collar.
Owing to adopting said apparatus, the utlity model has following advantage:
1, this test unit can well be estimated asphalt to flexural tensile stress and the coefficient resistivity of shear stress, and the curved scissors of simulated roadway combination preferably destroys form again.The proposition of this test unit has great importance to damage of bituminous pavement control and Asphalt Pavement Structure Design.
2, be placed with rubber blanket between described annular pressure head and described test specimen, can avoid pressure head edge formation stress to concentrate.
3, groove is carved with on the surface of described ring washer and circumferential collar, can limit test specimen generating horizontal displacement and warpage, can guarantee that test specimen is in admittedly to prop up stress.
4, adjust the size of ring washer and circumferential collar, can change the effective dimensions of test specimen; If the internal diameter of ring washer and circumferential collar and the size of annular pressure head are basic identical, just this test unit changes direct shear test into.
5, in the test, test specimen, pressure head, packing ring, the collar used is annular, and these members are axially symmetric structure, make the boundary condition of test specimen and loading environment comparatively even.
6, the member in described pilot system is steel, can not produce distortion in the warranty test process.
In sum, the utility model can be measured asphalt curved scissors combined strength preferably, again can the simulated roadway curved scissors combination destructive characteristics, simultaneously this utility model also have simple, be convenient to promote, test findings is stable, rationally, advantage reliably.The proposition of asphalt curved scissors combination test apparatus has great importance to damage of bituminous pavement control and Asphalt Pavement Structure Design.
Description of drawings
The structural representation of Fig. 1 the utility model test unit;
The structural representation of air bag component in Fig. 2 the utility model;
Fig. 3 the utility model test specimen stress schematic diagram;
The typical damage curve of Fig. 4 the utility model asphalt curved scissors test;
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:
As depicted in figs. 1 and 2, the utility model device comprises annular pressure head 1, interior air bag component 2, rubber blanket 3, pressure ring 4, ring washer 5, circumferential collar 7, curved scissors performance test mould 8, die trial support bar 9, pneumatic shuttle, and described pneumatic shuttle comprises tracheae, air pump and operation valve.Described annular pressure head 1 is arranged under MTS on pressure arm, for pilot system provides vertical load.Described annular pressure head 1 time is placed a rubber blanket measure-alike with it 3, prevents that annular pressure head 1 edge from stress occurring and concentrating.Described die trial support bar 9 is connected in the base of MTS Material Testing Machine frame bottom, and curved scissors performance test mould 8 is arranged on die trial support bar 9.Described circumferential collar 7 is arranged on the ring-shaped step of curved scissors performance test mould 8, and is corresponding with the position of described ring washer 5, plays the effect of regulating the test specimen effective dimensions.Described pressure ring 4 is placed on ring washer 5, and pressure ring 4 upper surfaces along the circumferential direction have screw thread mouth every 60 degree, after the tighten the screws nail, ring washer 5 is compressed.
interior air bag component 2 is difficult points of design curved scissors combination test apparatus, interior air bag component 2 comprises interior air bag gaseous core 24, interior air bag stationary installation and interior air bag rubber diaphragm 25, described interior air bag gaseous core 24 1 ends are provided with air intake opening, lower position is provided with the gas outlet, air intake opening first is communicated with tracheae 26, be connected with air pump with operation valve again, described interior air bag rubber diaphragm 25 is compressed the rear hollow cylinder that forms by air bag cap 22 and airbag cover 23, the diameter of described hollow cylinder is equal to or slightly less than the diameter of described annular test specimen 6 endoporus, described interior air bag stationary installation comprises set nut 21, air bag cap 22 and airbag cover 23, described interior air bag rubber diaphragm 25 is sleeved on outside described interior air bag gaseous core 24 and the two ends of described interior air bag rubber diaphragm 25 are fixed on the two ends of described interior air bag gaseous core 24 by described set nut 21, make and form interior air bag between described interior air bag rubber diaphragm 25 and described interior air bag gaseous core 24, the diameter of described air bag cap 22 is greater than the diameter of described annular test specimen 6 endoporus, make described interior air bag be fixed in described annular test specimen 6 endoporus, the gas outlet of described interior air bag gaseous core 24 is communicated with described interior air bag.The thickness of interior air bag rubber diaphragm 25 is 0.5mm, 0.8mm, 1mm, 1.2mm or 1.5mm.0.8mm thick interior air bag rubber diaphragm 25 is preferred plan, can guarantee the sealing of interior air bag component, can realize again the repeatedly use of air bag.
During moulding annular test specimen 6, need to infiltrate test specimen.In this process, inevitably can form some holes at the edge of boring.After connecting tracheae and opening air pump, air bag can be overflowed and explosion occurs from hole, and air bag cap 22, airbag cover 23 can compress air bag and prevent the air bag effusion greater than diameter of bore.Connecting tracheae unlatching air pump, after the sealing of air bag component, complete the installation of whole interior air bag component in confirming.
Embodiment:
The critical size of asphalt curved scissors composite test mould is: annular bitumen mixture specimen external diameter 150mm, internal diameter 40mm, height are 40mm; Air bag diameter 40mm; Annular pressure head external diameter 70mm, internal diameter 40mm; The external diameter of ring washer and circumferential collar is that 150mm, internal diameter are 130mm.Circumferential collar inside can be continued to place the little collar and be adjusted its width; Can place thin packing ring on ring washer and adjust its height.
In the curved scissors composite test, it is that 150mm, internal diameter are ring washer and the circumferential collar of 130mm that the upper and lower surface of test specimen is placed respectively external diameter, and groove is carved with on ring washer and circumferential collar surface, can play the effect that prevents the test specimen generating horizontal displacement.In pilot system, all member materials are steel, can be used as incompressible rigid body.Place circumferential collar in the scope of test specimen bottom 130mm≤r≤150mm, limited the vertical displacement of test specimen; The acting in conjunction of pressure ring, ring washer and die trial sidewall has limited horizontal shift and the vertical warpage of test specimen, make in the curved scissors composite test annular bitumen mixture specimen be in and admittedly prop up stress, the effective dimensions of ring specimen is: external diameter 130mm, internal diameter 40mm, high 40mm.
1, set up the mechanical model of test specimen, as shown in Figure 3, utilize cut deal theory and Elasticity formula to calculate that in the curved scissors composite test, test specimen is in curved scissors combined stress state, set up asphalt curved scissors intensity and ask and calculate formula and be:
R'
LJ=n×0.7+(P
max/A)×0.76
In formula: R'
LJBe the curved scissors combined strength of asphalt, Mpa;
N is the horizontal air pressure that applies, Mpa;
P
maxBe the vertical failing load of material, N;
A is the cross-sectional area of annular pressure head, m
2
2, make test specimen: adopting marshall compaction, hydrostatic profile or gyratory compaction molding legal system is the right cylinder test specimen of 150mm as diameter, cutting sample and unbearable sampling, and obtaining external diameter is 150mm, and internal diameter is 40mm, and height is the annular bitumen mixture specimen of 40mm.
3, interior air bag component is installed, is connected tracheae and start air pump, check whether tracheae and air bag leak gas.After guaranteeing that tracheae and air bag are air tight, ring specimen is placed on circumferential collar.
4, place ring washer and lay annular compression ring on the test specimen upper surface, the screw of tightening on pressure ring compresses the test specimen upper surface.
5, insulation: test specimen and mould temperature controller in 15 ℃ of environmental cabinets, are guaranteed that the temperature retention time of test specimen is more than 6 hours.
6, test: open air pump and apply certain horizontal air pressure to test specimen, place rubber blanket below annular pressure head, open the MTS Material Testing Machine, speed with 1mm/min applies vertical load, making test specimen that the curved scissors combination occur under the acting in conjunction of horizontal loading and vertical load destroys, off-test, bitumen mixture specimen obvious curved scissors occurs and destroys form, pressure and deformation data that in the analytical test process, Material Testing Machine gathers, as shown in Figure 4, obtain the curved scissors combined strength, after carrying out repeatedly parallel experiment, the data of parallel experiment are averaged, draw the data of following table.
In process of the test, radial horizontal fracture appears in test specimen lower surface inside edge, along with the continuation of load increases, these cracks to the bottom surface and the surface run through development, be the typical curved bad form of pulling open.Simultaneously, the disloction crack of hoop appears in the pressure head edge, belongs to typical shear failure form.Can conclude from bitumen mixture specimen stress and destruction form, asphalt is the curved scissors combination to occur destroy under the acting in conjunction of tension and shear stress.
From test findings as can be known, curved scissors composite test result is stable, discreteness is little.The asphalt curved scissors combined strength of measuring is 3.24MPa, lower than fail in bending intensity and the shear failure intensity of asphalt.This explanation is under the acting in conjunction of curved scissors stress, and the ability that the asphalt opposing destroys can weaken to some extent.Therefore, need consider emphatically the destruction that the curved scissors combined stress causes asphalt when Pavement Structure Design.
In sum, the utility model is simple, is convenient to large-scale promotion application.Can better measure asphalt curved scissors combined strength, can make up destructive characteristics by the simulated roadway curved scissors again; Adjust the size of test mould, can also change direct shear test into, the proposition of this test unit has great importance to damage of bituminous pavement control and Asphalt Pavement Structure Design.
Claims (4)
1. asphalt curved scissors performance test apparatus, comprise MTS Material Testing Machine and curved scissors performance test mould, also comprise interior air bag component, it is characterized in that: described curved scissors performance test mould is provided with cylinder shape groove, described cylinder shape groove inboard is provided with ring ladder, the internal diameter of described cylinder shape groove equals the external diameter of annular test specimen, the interior air bag of described interior air bag component be installed in the endoporus of annular test specimen and and the surperficial close contact of described endoporus, described interior air bag component provides air pressure by pneumatic shuttle, be provided with circumferential collar on the ring ladder of described cylinder shape groove inboard, described annular test specimen is placed on described circumferential collar, the top of described annular test specimen is pressed on described annular test specimen on described ring ladder by pressure ring, also be provided with ring washer between described pressure ring and described annular test specimen, the bottom support of described curved scissors performance test mould is on the die trial support bar of described MTS Material Testing Machine, described annular pressure head is connected with the lower pressure arm of described MTS Material Testing Machine, for the upper surface of described annular test specimen provides load.
2. asphalt curved scissors performance test apparatus according to claim 1, it is characterized in that: described interior air bag component comprises interior air bag gaseous core, interior air bag stationary installation and interior air bag rubber diaphragm, described interior air bag gaseous core one end is provided with air intake opening, the bottom is provided with the gas outlet, described interior air bag rubber diaphragm is hollow cylindrical tube, the diameter of the film formed hollow cylinder of described interior air bag rubber is equal to or less than the diameter of described annular test specimen endoporus, described interior air bag stationary installation comprises set nut, air bag cap and airbag cover, described interior air bag Rubber membrane cover is contained in outside described interior air bag gaseous core and the two ends of described interior air bag rubber diaphragm are fixed on the two ends of described interior air bag gaseous core by described set nut, make and form interior air bag between described interior air bag rubber diaphragm and described interior air bag gaseous core, described air bag cap and airbag cover are arranged on described interior air bag gaseous core, the diameter of described air bag cap and airbag cover is greater than the diameter of described annular test specimen endoporus, make described interior air bag be fixed in described annular test specimen endoporus, the gas outlet of described interior air bag gaseous core is communicated with described interior air bag.
3. asphalt curved scissors performance test apparatus according to claim 1, it is characterized in that: described circumferential collar is corresponding with the position of described ring washer.
4. asphalt curved scissors performance test apparatus according to claim 2, it is characterized in that: groove is carved with on the surface of described ring washer and circumferential collar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220739594 CN203025051U (en) | 2012-12-28 | 2012-12-28 | Asphalt mixture bending shear performance test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220739594 CN203025051U (en) | 2012-12-28 | 2012-12-28 | Asphalt mixture bending shear performance test device |
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| CN203025051U true CN203025051U (en) | 2013-06-26 |
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| CN 201220739594 Expired - Lifetime CN203025051U (en) | 2012-12-28 | 2012-12-28 | Asphalt mixture bending shear performance test device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076238A (en) * | 2012-12-28 | 2013-05-01 | 长沙理工大学 | Asphalt mixture bending shear performance test device and method |
| CN105842058A (en) * | 2016-05-13 | 2016-08-10 | 重庆交通大学 | Asphalt mixture beam specimen bending fatigue test fixture |
| WO2017005229A1 (en) * | 2015-07-09 | 2017-01-12 | Czech Technical University In Prague, Faculty Of Civil Engineering, Department Of Road Structures | Device for measuring shear properties of asphalt mixtures |
-
2012
- 2012-12-28 CN CN 201220739594 patent/CN203025051U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076238A (en) * | 2012-12-28 | 2013-05-01 | 长沙理工大学 | Asphalt mixture bending shear performance test device and method |
| CN103076238B (en) * | 2012-12-28 | 2015-02-11 | 长沙理工大学 | Asphalt mixture bending shear performance test device and method |
| WO2017005229A1 (en) * | 2015-07-09 | 2017-01-12 | Czech Technical University In Prague, Faculty Of Civil Engineering, Department Of Road Structures | Device for measuring shear properties of asphalt mixtures |
| CN107850517A (en) * | 2015-07-09 | 2018-03-27 | 布拉格捷克理工大学土木工程学院 | For measuring the device of asphalt mixture shearing characteristic |
| US10386280B2 (en) | 2015-07-09 | 2019-08-20 | Czech Technical University In Prague, Faculty Of Civil Engineering, Department Of Road Structures | Device for measuring shear properties of asphalt mixtures |
| CN105842058A (en) * | 2016-05-13 | 2016-08-10 | 重庆交通大学 | Asphalt mixture beam specimen bending fatigue test fixture |
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Granted publication date: 20130626 |
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