AASHTO TP 101-2012 Standard Method of Test for Estimating Fatigue Resistance of Asphalt Binders Using the Linear Amplitude Sweep.pdf
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1、Standard Method of Test for Estimating Fatigue Resistance of Asphalt Binders Using the Linear Amplitude Sweep AASHTO Designation: TP 101-12 (2015)1American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-2b TP 101-1 AASHTO
2、Standard Method of Test for Estimating Fatigue Resistance of Asphalt Binders Using the Linear Amplitude Sweep AASHTO Designation: TP 101-12 (2015)11. SCOPE 1.1. This test method covers the determination of an asphalt binders resistance to fatigue damage by means of cyclic loading employing systemati
3、c, linearly increasing load amplitudes. The amplitude sweep is conducted using the Dynamic Shear Rheometer (DSR) at the intermediate pavement temperature determined from the performance grade (PG) of the asphalt binder according to M 320. The test method can be used with binder aged using T 240 (RTF
4、OT) and R 28 (PAV) to simulate the aging for in-service asphalt pavements. 1.2. The values stated in SI units are to be regarded as the standard. 1.3. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this s
5、tandard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: M 320, Performance-Graded Asphalt Binder R 28, Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV
6、) T 240, Effect of Heat and Air on a Moving Film of Asphalt Binder (Rolling Thin-Film Oven Test) T 315, Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR) 2.2. ASTM Standard: D8, Standard Terminology Relating to Materials for Roads and Pavements 3. TERMINO
7、LOGY 3.1. Definitions: 3.1.1. Definitions of terms used in this test method may be found in ASTM D8, determined from common English usage, or combinations of both. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applic
8、able law.TS-2b TP 101-2 AASHTO 4. SUMMARY OF TEST METHOD 4.1. Asphalt binder is first aged using T 240 (RTFOT) to represent short-term aging of asphalt pavements. The binder may be further aged using R 28 (PAV) prior to testing in order to simulate long-term aging of asphalt pavements. A sample is p
9、repared according to T 315 (DSR) using the 8-mm parallel plate geometry with a 2-mm gap setting. The sample is tested in shear using a frequency sweep to determine its rheological properties. The sample is then tested using a series of oscillatory load cycles at systematically increasing amplitudes
10、at a constant frequency to cause accelerated fatigue damage. The continuum damage approach is used to calculate the fatigue resistance from the rheological properties and amplitude sweep results. 5. SIGNIFICANCE AND USE 5.1. This method is intended to evaluate the ability of an asphalt binder to res
11、ist fatigue damage by employing cyclic loading at increasing amplitudes in order to accelerate damage. The characteristics of the rate of damage accumulation in the material can be used to indicate the fatigue performance of the asphalt binder given pavement structural conditions and/or expected amo
12、unt of traffic loading using predictive modeling techniques. 6. APPARATUS 6.1. Use the apparatus as specified in T 315. 7. PROCEDURE 7.1. Condition the asphalt binder in accordance with T 240 (RTFOT) for short-term performance, or condition the asphalt binder in accordance with T 240 (RTFOT) followe
13、d by R 28 (PAV) for long-term performance. 7.2. Sample PreparationThe sample for the Amplitude Sweep is prepared following T 315 for 8-mm plates. The temperature control also follows the T 315 requirements. 7.2.1. This test may be performed on the same sample that was previously used to determine th
14、e rheological properties in the DSR on PAV residue as specified in M 320. 7.3. Test ProtocolTwo types of testing are performed in succession. The first test, a frequency sweep, is designed to obtain information on the rheological properties, and the second test, an amplitude sweep, is intended to me
15、asure the damage characteristics of the material. 7.3.1. Determination of “Alpha” ParameterIn order to perform the damage analysis, information regarding the undamaged material properties (represented by the parameter ) must be determined. The frequency sweep procedure outlined in Section 7.3.1.1 is
16、 used to determine the alpha parameter. 7.3.1.1. Frequency SweepFrequency sweep test data are used to determine the damage analysis “alpha” parameter. The frequency sweep test is performed at the selected temperature and applies oscillatory shear loading at constant amplitude over a range of loading
17、 frequencies. For this test method, the frequency sweep test is selected from the DSR manufacturers controller software, employing an applied load of 0.1 percent strain over a range of frequencies from 0.2 to 30 Hz. Data are sampled at the following 12 unique frequencies (all in Hz): 0.2 0.4 0.6 0.8
18、 1.0 2.0 4.0 6.0 8.0 10 20 30 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-2b TP 101-3 AASHTO Complex shear modulus |G*|, Pa and phase angle , degrees are recorded at each frequency, as shown in Fi
19、gure 1. Figure 1Example Output from Frequency Sweep Test 7.3.2. Amplitude SweepThe second test is run at the selected temperature using oscillatory shear in strain-control mode at a frequency of 10 Hz. The loading scheme consists of 10-s intervals of constant strain amplitude, where each interval is
20、 followed by another interval of increased strain amplitude as follows: 0.1 percent, 1.0 percent, 2.0 percent, 3.0 percent, 4.0 percent, 5.0 percent, 6.0 percent, 7.0 percent, 8.0 percent, 9.0 percent, 10 percent, 11 percent, 12 percent, 13 percent, 14 percent, 15 percent, 16 percent, 17 percent, 18
21、 percent, 19 percent, 20 percent, 21 percent, 22 percent, 23 percent, 24 percent, 25 percent, 26 percent, 27 percent, 28 percent, 29 percent, 30 percent. Peak shear strain and peak shear stress are recorded every 10 load cycles (1 s), along with phase angle , degrees and dynamic shear modulus |G*|,
22、Pa. Figure 2Loading Scheme for Amplitude Sweep Test 8. CALCULATION AND INTERPRETATION OF RESULTS 8.1. In order to determine the parameter from frequency sweep test data, the following calculations are performed: 0.1 1.0 10.0 100.01.0E + 081.0E + 071.0E + 061.0E + 05Complex ShearModulus58565452504846
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