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| Asphalt viscoelastic model and its universality under dynamic and static loading conditions |
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SHI Jingtao1,2, LI Jun1, XU Zhongkai3, SHAN Da3, LI Chun2, LUO Shizhong3, CHEN Long3, WANG Tihong2, LI Jianxin2
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(1.State Key Laboratory of Heavy Oil Processing in China University of Petroleum(East China), Qingdao 266580, China;2.Research Institute of PetroChina Fuel Oil Company Limited, Beijing 100195, China;3.College of Life Science and Techenology in Beijing University of Chemical Technology, Beijing 100292, China)
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| Abstract: |
| The frequency sweep and creep tests of asphalt at different temperatures were carried out by dynamic shear rheometer (DSR). The various classical models and fractional derivative models were used to describe the viscoelasticity of asphalt under frequency sweep. The creep behavior of asphalt was characterized by classical models, in which the model parameters at different temperatures were analyzed. Furthermore, a universal model under different loading conditions was established. It is found that there are some fluctuations of the asphalt rheological properties described by the classical model at dynamic mode. Meanwhile, the fractional derivative model presents a good fitting result. The classical model shows a good fitting result under creep tests, and the model parameters are satisfied the Arrhenius equation. However, the fractional derivative model parameters at different temperatures are irregular. There is only a universal model which can be applied to static and dynamic conditions at 52 ℃. There is no universal model at other temperatures. |
| Key words: road engineering asphalt viscoelasticity Voigt model fractional model universal model |
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