A comparative study for fatigue characterization of asphalt binder using the linear amplitude sweep test
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ORIGINAL ARTICLE
A comparative study for fatigue characterization of asphalt binder using the linear amplitude sweep test Chao Wang
. Yifang Chen . Wei Xie
Received: 5 January 2020 / Accepted: 7 July 2020 © RILEM 2020
Abstract Currently the linear amplitude sweep (LAS) test is one of the main fatigue protocols to estimate the fatigue resistance of asphalt binder. In past 10-years, several data interpretation approaches have been developed for the LAS-based binder fatigue modeling. The objective of this paper is to compare the currently available analytical approaches for the data interpretation of LAS test and further investigate the potential links between the different LAS-based fatigue evaluations of asphalt binders. Totally 20 types of unmodified and modified asphalt binders are selected in this study, which actually cover 35 sample conditions under different aging and temperature levels. Experimental and analysis results indicate that the full fatigue performance of asphalt binder can be characterized from with the S-VECD & GR approach. The failure property in LAS test is also well correlated to the binder fatigue life simulation and thus can be utilized to more efficiently distinguish the binder fatigue resistance. Furthermore, the performance predictive accuracy of AASHTO TP101
specification method is strongly dependent on the selected failure definition. Taking the artificial failure definition of 35% reduction in |G*|·sin δ largely underestimates the binder fatigue life when compared to the S-VECD & GR approach. However, when a material-dependent failure definition of peak stress is alternatively employed in specification method, the correlation of the predictive binder fatigue life between the two analytical approaches is significantly improved and a linear relationship is additionally found between the S-VECD & GR approach and specification method. Therefore, it is recommended that when only the standard LAS test with one loading rate is available in practice, the peak stress failure definition should be used in AASHTO TP101 specification method to provide relatively accurate fatigue performance estimation of asphalt binder.
C. Wang (&) · Y. Chen · W. Xie Department of Road & Urban Railway Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China e-mail: [email protected]
1 Introduction
Y. Chen e-mail: [email protected] W. Xie e-mail: [email protected]
Keywords Asphalt binder · Fatigue damage · Fatigue failure · Linear amplitude sweep · Time sweep
The fatigue cracking due to the repeated traffic loading is one of the main distresses that normally reducing the performance and service life of the asphalt pavements [1]. Generally, the material selection and design, structure design as well as the construction and maintenance activities comprehensively contribute to
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a better fatigue-resistant field pavement. From the material level, the fatigue performance of paving asphalt mi
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