Abstract
To study the effect of asphalt-aggregate ratio and gradation on freeze-thaw fatigue damage and the damage evolution mechanism of asphalt mixture, six Marshall specimens were designed for freeze-thaw indirect tensile fatigue test. The damage factor was defined based on accumulative dissipated energy(ADE), the variation of damage factor with freeze-thaw cycles and stress ratio was obtained, combined with damage evolution equation, the influence of asphalt-aggregate ratio and gradation on freeze-thaw fatigue damage and the damage evolution mechanism were analyzed. The results show that the ADE of the AC-13S with 5.8% asphalt-aggregate ratio is larger, which can bear more loads and has better antifreeze-thaw fatigue damage performance. The change rate of total accumulative dissipated energy decreases with the increase of freeze-thaw cycles, similar conclusions can be obtained for specimens under different stress. The evolution law of the first-order difference ADE change rate is different under different stress levels.
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