Study on the Strain Fatigue Threshold of Asphalt Mixture for Long-Life Asphalt Pavement

Determination of the strain fatigue threshold of asphalt mixtures is very important for the design of long-life asphalt pavement. A new method to determine the strain fatigue threshold of an asphalt mixture has been put forward in this paper by the establishment of a three-parameter power function model based on the conventional two—parameter model (ε-N). The strain fatigue threshold was determined by the analyzing the AC-25 and ATB-25 asphalt mixture test results of the three-parameter power function model. This study has shown that the strain fatigue threshold exists in low-strain conditions. The strain fatigue threshold of AC-25 and ATB-25 are 78μVegr; and 59μVegr; respectively,with 6% air voids. The fatigue limit strain for AC-25 is between 78 and 95μVegr;, and for ATB-25 is between 59 and 75μVegr;, which are recommended by Liaoning Shenyang in China.