CN103267693A - Simple method for determining high modulus asphalt fatigue performance - Google Patents
Simple method for determining high modulus asphalt fatigue performance Download PDFInfo
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- CN103267693A CN103267693A CN2013101655222A CN201310165522A CN103267693A CN 103267693 A CN103267693 A CN 103267693A CN 2013101655222 A CN2013101655222 A CN 2013101655222A CN 201310165522 A CN201310165522 A CN 201310165522A CN 103267693 A CN103267693 A CN 103267693A
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Abstract
The present invention relates to a simple method for determining high modulus asphalt fatigue performance. The method comprises: adopting a time scanning test to test plural shear moduli of high modulus asphalt under different loading times; and specifically adopting the loading time corresponding to attenuation of the plural shear moduli to 50% of the initial value at a temperature of 20 DEG C under frequency of 10 Hz, a strain of 1% (characterizes light traffic), a strain of 3% (characterizes moderate traffic) and a strain of 5% (characterizes heavy traffic) as a characteristic value of a high modulus asphalt fatigue performance simple test method. The test method has the following characteristics that: test data treatment is simple, special data analysis software is not required, high modulus asphalt fatigue performance simple test method application and promotion are easily achieved, the strain of the high modulus asphalt fatigue performance is 1-5% so as to carry out fatigue performance comparison on the high modulus asphalt under the same strain condition, and evaluation indexes are scientific and credible.
Description
Technical field
The invention belongs to the road engineering field, be specifically related to a kind of simple and easy method of measuring the high-modulus asphalt fatigue behaviour.
Background technology
Fatigue crack is one of main disease that influences the bituminous pavement usability, must consider the fatigue behaviour of compound in asphalt and Asphalt Pavement Structure Design.The asphalt fatigue behaviour mainly is subjected to the influence of pitch fatigue behaviour.In the existing 3 class pitch appraisement systems, pen. staging hierarchy and viscosity chassification system do not have the evaluation index of reflection pitch fatigue behaviour, and the tired factor G*sin δ index that proposes in the PG staging hierarchy can not correctly characterize the fatigue behaviour of pitch.On the whole, there be not evaluation index and the method for testing that effectively characterizes the pitch fatigue behaviour in the existing asphalt performance appraisement system.
Summary of the invention
The object of the present invention is to provide a kind of simple and easy method of measuring the high-modulus asphalt fatigue behaviour, this assay method has that test operation is simple, and test findings is accurately credible, and the evaluation index mechanical meaning clearly waits characteristics.
The present invention solves above-mentioned technical matters by the following technical solutions:
A kind of simple and easy method of measuring the high-modulus asphalt fatigue behaviour, concrete steps are as follows:
Treated high-modulus asphalt test specimen is placed between the test fixture, uses dynamic shear rheometer, adopt the time scan pattern under the vibration loading, the fatigue behaviour of described high-modulus asphalt test specimen under 20 ℃ tested; Decay to the loading number of times of 50% correspondence of initial value with modulus as the eigenwert of high-modulus asphalt fatigue behaviour, control vibration loading frequency is 10Hz, the strain size is 1% ~ 5%, and wherein strain size 1% characterizes light-duty traffic, 3% and characterizes medium traffic, the heavily loaded traffic of 5% sign.
Among the present invention, described test fixture is circular two plate jigs, and the diameter of described anchor clamps is 8mm, and the thickness of pitch is 2000 μ m between the described pair of plate jig.
Among the present invention, at the test initial stage, therefore the experimental data less stable defines the 100th the complex shear modulus size under the loading and is initial complex shear modulus.
In the high-modulus asphalt pavement structure, high-modulus asphalt is subjected to the traffic load effect, and the determining of high-modulus asphalt fatigue property test condition taken an examination and considered the actual forced status of high-modulus asphalt in pavement structure, to guarantee the validity of method of testing.The range of shear strain 0.8% ~ 3.9% of high-modulus asphalt in pavement structure conforms to substantially under 1% ~ 5% range of strain and the traffic load effect.
The complex shear modulus that the simple and easy method of the mensuration high-modulus asphalt fatigue behaviour that the present invention proposes obtains decays to the loading number of times of 50% correspondence of initial value as the eigenwert of high-modulus asphalt fatigue behaviour, specifically be loading frequency 10Hz, 20 ℃ of temperature, strain size 1%(characterizes light-duty traffic), 3%(characterizes medium traffic) and 5%(characterize heavily loaded traffic) under complex shear modulus decay to the loading number of times of 50% correspondence of initial value, specifically see Fig. 1.
The simple and easy method of mensuration high-modulus asphalt fatigue behaviour provided by the invention has the following advantages:
1. data are handled simply, do not need to use the exclusive data analysis software, are conducive to application and the popularization of high-modulus asphalt fatigue property test simple and easy method;
2. determined that high-modulus asphalt fatigue behaviour strain level is 1% ~ 5%, made high-modulus asphalt carry out fatigue behaviour relatively under the same strain size, evaluation index is science more;
3. easily-testing method of the present invention is used for estimating the fatigue behaviour of high-modulus asphalt, method is simple, and the result is accurately credible.
Description of drawings
Fig. 1 is 50% synoptic diagram that modulus decays to initial value in the high-modulus asphalt experiment on fatigue properties.
Fig. 2 is road surface structural representation when calculating in the high-modulus asphalt pavement structure pitch shearing strain.
Fig. 3 is road surface load parameter synoptic diagram.
Embodiment
Further specify the present invention by reference to the accompanying drawings below by embodiment.
Embodiment 1
For clear and definite high-modulus asphalt fatigue property test simple and easy method, existing typically the test in conjunction with one is illustrated.
(1) shaping test piece: high-modulus asphalt is heated to the trickling state, pours into a mould at least 3 parallel test specimens of circle, the about 8mm of diameter, height 2mm ~ 2.5mm, calking test specimen are positioned over the room temperature cooling, are not less than cool time 30 minutes.
(2) lay test specimen: select the circular plate jig of diameter 8mm for use, the high-modulus asphalt test specimen is placed between the anchor clamps, spacing jig is 2050 μ m about regulating, and behind the finishing sample spacing jig is adjusted into 2000 μ m.
(3) insulation: the high-modulus asphalt test specimen that trims and anchor clamps are immersed to be incubated in 82 ℃ of water-baths be not less than 20 minutes (soak is in order to guarantee that pitch test specimen and anchor clamps adhere to each other fully), drop to 20 ℃ of insulations afterwards and be not less than 20 minutes.
(4) carry out the time scan test: adopt the vibration loading mode, loading frequency is 10Hz, and the strain size is 1% ~ 5%.
The big I of the actual strain of high-modulus asphalt in pavement structure is by calculating, and computation process is:
When 1. utilizing BISAR software calculating high-modulus asphalt compound to be applied to the different layers position, the inner shearing strain size of pavement structure, pavement structure is seen Fig. 2, and the load parameter is seen Fig. 3, and δ=0.1065m, the high-modulus asphalt compound modulus parameter under 20 ℃ sees Table 1.Under loaded with standard 0.7MPa, high-modulus asphalt compound shearing strain size is 166.2 μ ε ~ 423.8 μ ε, is 166.2 μ ε ~ 787.4 μ ε under 0.7MPa ~ 1.3MPa.
Table 1 high-modulus asphalt compound modulus size (MPa)
| Temperature | High-modulus asphalt compound 1 | High-modulus asphalt compound 2 | High-modulus asphalt compound 3 | The SBS asphalt | The 70# asphalt |
| 20℃ | 2350 | 2430 | 2517 | 1936 | 1689 |
2. according to the result of study of SHRP-A-404: the strain size of pitch is 50 times of asphalt strain size.Calculate the range of shear strain 0.8% ~ 3.9% of high-modulus asphalt accordingly.Reference literature: SHRP A-404. Fatigue Response of Asphalt-Aggregate Mixes. Asphalt Research Program, Institute of Transportation Studies, University of California, Strategic Highway Research Program, National Research Council, Berkeley. 1994.
Claims (3)
1. simple and easy method of measuring the high-modulus asphalt fatigue behaviour is characterized in that concrete steps are as follows:
Treated high-modulus asphalt test specimen is placed between the test fixture, uses dynamic shear rheometer, adopt the time scan pattern under the vibration loading, the fatigue behaviour of described high-modulus asphalt test specimen under 20 ℃ tested; Decay to the loading number of times of 50% correspondence of initial value with modulus as the eigenwert of high-modulus asphalt fatigue behaviour, control vibration loading frequency is 10Hz, the strain size is 1% ~ 5%, and wherein strain size 1% characterizes light-duty traffic, 3% and characterizes medium traffic, the heavily loaded traffic of 5% sign.
2. method according to claim 1 is characterized in that defining the 100th the complex shear modulus size under the loading and is initial complex shear modulus.
3. method according to claim 1 is characterized in that described test fixture is circular two plate jigs, and the diameter of described anchor clamps is 8mm, and the thickness of pitch is 2000 μ m between the described pair of plate jig.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406866A (en) * | 2014-11-25 | 2015-03-11 | 哈尔滨工业大学 | Method for dividing influence areas of asphalt fatigue performance in stress and strain control modes |
| CN105891029A (en) * | 2016-06-30 | 2016-08-24 | 哈尔滨工业大学 | Pitch fatigue performance evaluation method based on fracture mechanic theory |
| CN106290066A (en) * | 2016-08-04 | 2017-01-04 | 长安大学 | A kind of determination method of asphalt mastic filler critical volume fraction |
Citations (6)
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| EP0825439A2 (en) * | 1996-08-13 | 1998-02-25 | Pavement Technology, Inc. | Testing machine for pavement samples |
| RU2299417C2 (en) * | 2005-07-12 | 2007-05-20 | Сергей Константинович Илиополов | Mode of evaluation of fatigue of asphalt concrete at cyclical dynamic impacts |
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| CN101788431A (en) * | 2010-02-10 | 2010-07-28 | 长沙理工大学 | Device and method for testing shear performance of asphalt mixture |
| CN102072840A (en) * | 2010-12-21 | 2011-05-25 | 东南大学 | Method for testing shear fatigue of asphalt mixture |
| CN102608022A (en) * | 2012-03-13 | 2012-07-25 | 同济大学 | Method for measuring complex shear modulus of calking for cement concrete pavement |
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2013
- 2013-05-08 CN CN2013101655222A patent/CN103267693A/en active Pending
Patent Citations (6)
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| EP0825439A2 (en) * | 1996-08-13 | 1998-02-25 | Pavement Technology, Inc. | Testing machine for pavement samples |
| RU2299417C2 (en) * | 2005-07-12 | 2007-05-20 | Сергей Константинович Илиополов | Mode of evaluation of fatigue of asphalt concrete at cyclical dynamic impacts |
| CN101299040A (en) * | 2008-04-25 | 2008-11-05 | 长安大学 | Measuring method for asphalt mixture cryogenic fatigue performance test |
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| AROON SHENOY: "Fatigue Testing and Evaluation of Asphalt Binders Using the Dynamic Shear Rheometer", 《JOURNAL OF TESTING AND EVALUATION》, vol. 30, no. 4, 31 January 2002 (2002-01-31), pages 303 - 312 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406866A (en) * | 2014-11-25 | 2015-03-11 | 哈尔滨工业大学 | Method for dividing influence areas of asphalt fatigue performance in stress and strain control modes |
| CN105891029A (en) * | 2016-06-30 | 2016-08-24 | 哈尔滨工业大学 | Pitch fatigue performance evaluation method based on fracture mechanic theory |
| CN105891029B (en) * | 2016-06-30 | 2018-11-23 | 哈尔滨工业大学 | A kind of pitch fatigue behaviour evaluation method based on Theory of Fracture Mechanics |
| CN106290066A (en) * | 2016-08-04 | 2017-01-04 | 长安大学 | A kind of determination method of asphalt mastic filler critical volume fraction |
| CN106290066B (en) * | 2016-08-04 | 2019-01-11 | 长安大学 | A kind of determination method of asphalt mastic filler critical volume fraction |
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Application publication date: 20130828 |