CN105445120A - In-situ test method for shear strength of asphalt mixture - Google Patents
In-situ test method for shear strength of asphalt mixture Download PDFInfo
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- CN105445120A CN105445120A CN201510005012.8A CN201510005012A CN105445120A CN 105445120 A CN105445120 A CN 105445120A CN 201510005012 A CN201510005012 A CN 201510005012A CN 105445120 A CN105445120 A CN 105445120A
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Abstract
The invention discloses an in-situ test method for shear strength of an asphalt mixture. The method comprises the following steps: providing a load through an in-situ test vehicle, providing pressure through a reaction frame and a pressure device; adjusting the position of a pressure head, and aligning the pressure head to a measurement point; exerting pressure to the pressure head through a pressure sensor, pressing the pressure head into a pavement and generating displacement; carrying out displacement measurement by using a displacement sensor on the basis of a reference plane platform; simultaneously collecting and processing a pressure signal of the pressure sensor and a displacement signal of the displacement sensor by a data collection device, and drawing a pressure-deformation diagram; and when a stress value is reduced to 75% of a stress extreme point, stopping measurement, and taking the strength of a destroy extreme point as the shear strength of the asphalt mixture pavement. According to the in-situ test method for the shear strength of the asphalt mixture provided by the invention, in-situ and real-time measurement can be achieved; the measurement result is relatively high in value; and the measurement accuracy is improved.
Description
Technical field
The present invention relates to road surface field of measuring technique, particularly a kind of asphalt shear strength in-situ check and test method.
Background technology
Along with the quick growth of national economy, rapidly, up to now, the highway total kilometrage be open to the traffic exceedes 20000km, and wherein major part is bituminous pavement in the high-grade highway construction development of China.But along with highway mileage grows with each passing day, due to the surge of the volume of traffic and vehicular load, the raising of overloaded vehicle and average speed, having there is new trend in the destruction of bituminous pavement, causes huge economic loss to country and society.
Asphalt is a kind of typical viscous-elastic material, and its intensity and stiffness modulus reduce along with the rising of temperature.The rut that bituminous pavement occurs, passing, gather around the diseases such as bag, is at temperature and traffic loading acting in conjunction, caused by the anti-shear ability deficiency of asphalt.In the traffic of China's highway, multiaxis, solid axle carry, high wheel load feature is obvious, and ubiquity overloading, causes un-uniformly distributed will produce larger shear stress in concrete surface thus.Before this, the anti-shearing index of material do not considered in the design process by asphalt, and this may be that the basic reason that large area is damaged appears in road surface.
At present, shear resistance for asphaltic road-mix surface course is measured, general employing uniaxial penetration Experimental Method in Laboratory, namely a sample is obtained, then measured by pressure head pressurization, but during sample pressurized in this metering system, under being in the condition without sidewise restraint, different from road surface actual loading process, measure inaccurate.
Therefore, how providing a kind of asphalt shear strength in-situ check and test method, to improve measurement accuracy, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of asphalt shear strength in-situ check and test method, to improve measurement accuracy.
For solving the problems of the technologies described above, the invention provides following scheme:
A kind of asphalt shear strength in-situ check and test method, load is provided by in-site measurement car, then pressure is provided by reaction frame and pressure apparatus, adjustment ram position, pressure head and measurement point are aligned, then pressure is applied by pressure transducer to pressure head, pressure head press-in road surface also produces displacement, displacement transducer with reference field platform for benchmark carries out displacement measurement, simultaneously the displacement signal of the data collector pressure signal and institute's displacement sensors of collecting described pressure transducer is gone forward side by side row relax, draw pressure-deformation figure, when stress value reduces to 75 percent of maximum stress point, measure and stop, get and destroy the shear strength of extreme point intensity as asphaltic road-mix surface course.
Preferably, above-mentioned pressure apparatus is hydraulic means, and described pressure apparatus comprises hydraulic cylinder, and described hydraulic cylinder is vertically set on the bottom surface of described reaction frame.
Preferably, above-mentioned pressure apparatus is Non-follow control.
Preferably, upper displacement sensors is fixed on described pressure head by clamping device.
Preferably, above-mentioned pressure head is of a size of Φ 42mm × 50mm or Φ 28.5mm × 50mm.
Preferably, the material of above-mentioned pressure head is Q235 stainless steel.
Preferably, the Rockwell's hardness of above-mentioned pressure head is 10 ~ 30.
Preferably, the lower surface of above-mentioned pressure head is smooth, and its upper surface is connected with described pressure transducer by screw thread.
Preferably, said reference planar table contacts with road surface and fixes, and described pressure head passes from the center of described reference plane platform.
The asphalt shear strength in-situ check and test method that the invention described above provides, the device adopted comprises reaction frame, pressure apparatus, pressure transducer, displacement transducer, pressure head, reference plane platform and data collector, wherein, described pressure apparatus is connected with described reaction frame, described pressure transducer is connected with described pressure apparatus and described pressure head simultaneously, institute's displacement sensors to be fixed on described pressure head and to contact with described reference plane platform, described data collector collects the pressure signal of described pressure transducer and the displacement signal of institute's displacement sensors.During use, reaction frame is fixed on in-site measurement car, load is provided by in-site measurement car, then pressure is provided by reaction frame and pressure apparatus, adjustment ram position, pressure head and measurement point are aligned, then pressure is applied by pressure transducer to pressure head, pressure head press-in road surface also produces displacement, displacement transducer with reference field platform for benchmark carries out displacement measurement, simultaneously the displacement signal of the data collector pressure signal and institute's displacement sensors of collecting described pressure transducer is gone forward side by side row relax, draw pressure-deformation figure, when stress value reduces to 75 percent of maximum stress point, measure and stop, get and destroy the shear strength of extreme point intensity as asphaltic road-mix surface course.Asphalt shear strength in-situ check and test method provided by the present invention can realize scene and measure in real time on the spot, road pavement shear failure at the scene, stress limits stress for there being side, at high temperature to shear stressed state completely the same with road surface, therefore, it is possible to react the stress on road surface more truly, accurately, measurement result is worth higher, improves measurement accuracy.
Accompanying drawing explanation
Concrete structure schematic diagram during the asphalt shear strength in-situ check and test method work that Fig. 1 provides for the embodiment of the present invention.
In upper Fig. 1:
Reaction frame 1, pressure apparatus 2, pressure transducer 3, displacement transducer 4, pressure head 5, reference field platform 6, transacter 7.
Embodiment
In order to make those skilled in the art understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1, the concrete structure schematic diagram during asphalt shear strength in-situ check and test method work that Fig. 1 provides for the embodiment of the present invention.
The asphalt shear strength in-situ check and test method that the embodiment of the present invention provides, the device adopted comprises reaction frame 1, pressure apparatus 2, pressure transducer 3, displacement transducer 4, pressure head 5, reference plane platform 6 and data collector 7, wherein, pressure apparatus 2 is connected with reaction frame 1, pressure transducer 2 is connected with pressure apparatus 2 and pressure head 5 simultaneously, displacement transducer 4 to be fixed on pressure head 5 and to contact with reference plane platform 6, and data collector 7 collects the pressure signal of pressure transducer 3 and the displacement signal of displacement transducer 4.During use, reaction frame 1 is fixed on in-site measurement car, load is provided by in-site measurement car, then pressure is provided by reaction frame 1 and pressure apparatus 2, adjustment pressure head 5 position, pressure head 5 and measurement point are aligned, then pressure is applied by pressure transducer 3 to pressure head 5, pressure head 5 is pressed into road surface and produces displacement, displacement transducer 4 with reference field platform 6 for benchmark carries out displacement measurement, simultaneously the displacement signal of data collector 7 pressure signal and displacement transducer 4 of collecting pressure transducer 3 is gone forward side by side row relax, draw pressure-deformation figure, this pressure-deformation figure can be take pressure as X-axis, take deflection as Y-axis, when stress value reduces to 75 percent of maximum stress point, measure and stop, get and destroy the shear strength of extreme point intensity as asphaltic road-mix surface course.The asphalt shear strength in-situ check and test method that the embodiment of the present invention provides can realize scene and measure in real time on the spot, road pavement shear failure at the scene, stress limits stress for there being side, at high temperature to shear stressed state completely the same with road surface, therefore, it is possible to react the stress on road surface more truly, accurately, improve measurement accuracy.
Concrete, in use, equipment is placed in Surface of Trial Pavement, and adjusts pressure head 5 position, make pressure head 5 and measurement point centering.Coarse adjustment reaction frame 1 position, makes itself and in-site measurement car rear bumper distance be about 1mm, and then finely tune reaction frame 1 position, make itself and in-site measurement car bumper contact, until contact reading is close to 0.05KN, contact may not exceed 0.05KN.Starting pressure device 2 loads, record pressure and displacement, and when stress value reduces to 90 percent of maximum stress point, test stops.Get and destroy the shear strength of extreme point intensity as compound.
The asphalt shear strength in-situ check and test method that the embodiment of the present invention provides can with large-scale inspection vehicle with the use of, detect road surface shear strength at the scene, test condition is consistent with the real conditions on road surface, the performance that can reflect road surface the most truly of test findings, and easy to carry, the accessory such as temperature control box, counterweight that need not be extra can be tested, certainly, also can add counterweight with the use of, counterweight can be provided by in-site measurement car.
In order to optimize such scheme further, pressure apparatus 2 is hydraulic means, and pressure apparatus 2 comprises hydraulic cylinder, and hydraulic cylinder is vertically set on the bottom surface of reaction frame 1.Compact conformation, and better can apply pressure, and the trial load of 6t-10t can be provided at the scene, during the table temperature 40 DEG C-60 DEG C of road, pressure head 5 can injection road surface 2cm-3cm, with indoor uniaxial penetration test of the prior art, the loading speed 1mm/min of load, requires that loading speed is identical, can form effective contrast.
In order to optimize such scheme further, pressure apparatus 2 is Non-follow control, and do not have control lag, control accuracy is high, and it is convenient to control.
In order to optimize such scheme further, displacement transducer 4 is fixed on pressure head 5 by clamping device.Be convenient for changing, and, can according to the position of actual conditions adjusted position displacement sensor 4.
In order to optimize such scheme further, pressure head 5 is of a size of Φ 42mm × 50mm or Φ 28.5mm × 50mm, and meanwhile, the material of pressure head 5 can adopt Q235 stainless steel, and its Rockwell's hardness can be 10 ~ 30, and measurement effect is better.
In order to optimize such scheme further, the lower surface of pressure head 5 is smooth, and its upper surface is connected with pressure transducer 3 by screw thread, and facilitate the replacing of pressure head 5, measurement effect is better.
In order to optimize such scheme further, reference plane platform 6 contacts with road surface and fixes, and pressure head 5 passes from the center of reference plane platform 6, improves measuring accuracy.
Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. an asphalt shear strength in-situ check and test method, it is characterized in that, load is provided by in-site measurement car, then pressure is provided by reaction frame and pressure apparatus, adjustment ram position, pressure head and measurement point are aligned, then pressure is applied by pressure transducer to pressure head, pressure head press-in road surface also produces displacement, displacement transducer with reference field platform for benchmark carries out displacement measurement, simultaneously the displacement signal of the data collector pressure signal and institute's displacement sensors of collecting described pressure transducer is gone forward side by side row relax, draw pressure-deformation figure, when stress value reduces to 75 percent of maximum stress point, measure and stop, get and destroy the shear strength of extreme point intensity as asphaltic road-mix surface course.
2. asphalt shear strength in-situ check and test method according to claim 1, is characterized in that, described pressure apparatus is hydraulic means, and described pressure apparatus comprises hydraulic cylinder, and described hydraulic cylinder is vertically set on the bottom surface of described reaction frame.
3. asphalt shear strength in-situ check and test method according to claim 2, is characterized in that, described pressure apparatus is Non-follow control.
4. asphalt shear strength in-situ check and test method according to claim 1, is characterized in that, institute's displacement sensors is fixed on described pressure head by clamping device.
5. asphalt shear strength in-situ check and test method according to claim 1, is characterized in that, described pressure head is of a size of Φ 42mm × 50mm or Φ 28.5mm × 50mm.
6. asphalt shear strength in-situ check and test method according to claim 1, is characterized in that, the material of described pressure head is Q235 stainless steel.
7. asphalt shear strength in-situ check and test method according to claim 1, is characterized in that, the Rockwell's hardness of described pressure head is 10 ~ 30.
8. asphalt shear strength in-situ check and test method according to claim 1, it is characterized in that, the lower surface of described pressure head is smooth, and its upper surface is connected with described pressure transducer by screw thread.
9. asphalt shear strength in-situ check and test method according to claim 1, is characterized in that, described reference plane platform contacts with road surface and fixes, and described pressure head passes from the center of described reference plane platform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510005012.8A CN105445120A (en) | 2015-01-06 | 2015-01-06 | In-situ test method for shear strength of asphalt mixture |
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| CN201510005012.8A CN105445120A (en) | 2015-01-06 | 2015-01-06 | In-situ test method for shear strength of asphalt mixture |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973717A (en) * | 2016-06-17 | 2016-09-28 | 哈尔滨工业大学 | Comprehensive bituminous-mixture low-temperature-performance detection device |
| CN106198376A (en) * | 2016-08-02 | 2016-12-07 | 广西大学 | Measure the consolidation apparatus of pore pressure |
| CN114971364A (en) * | 2022-06-14 | 2022-08-30 | 苏交科集团股份有限公司 | Risk assessment method and system for container stacking place |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105973717A (en) * | 2016-06-17 | 2016-09-28 | 哈尔滨工业大学 | Comprehensive bituminous-mixture low-temperature-performance detection device |
| CN105973717B (en) * | 2016-06-17 | 2018-10-09 | 哈尔滨工业大学 | A kind of comprehensive low temperature performance of asphalt detection device |
| CN106198376A (en) * | 2016-08-02 | 2016-12-07 | 广西大学 | Measure the consolidation apparatus of pore pressure |
| CN114971364A (en) * | 2022-06-14 | 2022-08-30 | 苏交科集团股份有限公司 | Risk assessment method and system for container stacking place |
| CN114971364B (en) * | 2022-06-14 | 2022-12-09 | 苏交科集团股份有限公司 | Risk assessment method and system for container stacking place |
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Application publication date: 20160330 |