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Fatigue performance evaluation of recycled asphalt mixture based on energy control mode

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Document pages: 7 pages

Abstract: The fatigue performance of asphalt mixture is an important input of mechanical experience in pavement design. In order to better understand the fatigue performance of asphalt mixture and predict the fatigue life of asphalt mixture more accurately, the energy control test mode is introduced. Based on the realization theory, the laboratory practice of energy control mode is realized through four-point bending fatigue test under multi-step loading. Under this mode, the fatigue performance of typical AC-20 asphalt specimens with different recycled asphalt pavement (RAP) content was tested and evaluated. The results show that the variation law of energy dissipation and cumulative energy conforms to the load control principle, which proves the feasibility of this method. I addition, the fatigue life of the asphalt mixture in the energy-controlled mode was between that for the stress-controlled and strain-controlled modes. The specimen with a higher RAP content has a longer fatigue life and better fatigue performance.

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