Study on Dynamic Performance of Graphene-Modified Asphalt Mixtures
Graphene-modified asphalt mixtures were prepared based on the AC-20 gradation,and the effects of graphene addition on the dynamic properties of asphalt mixtures were investigated through four-point bending fatigue tests and dynamic creep tests,with base asphalt mixtures used as a reference. The test results indicate that the incorporation of graphene can effectively improve the dynamic properties of asphalt mixtures. In the four-point bending fatigue tests,the fatigue life of the asphalt mixtures increased by 46％,25％,and 5％ respectively at different strain levels. While the stiffness modulus of the asphalt mixtures was enhanced,the decay rate of the stiffness modulus was also reduced,and the cumulative dissipated energy exhibited a linear relationship with the strain level on a double logarithmic coordinate. In the dynamic creep tests,the total strain of the asphalt mixtures decreased by 25％ and 29％ respectively in test environments at 35℃ and 45℃,and by 20％ under 1,900 load cycles in a test environment at 60℃. At various temperatures,the strain rates decreased by 32％,55％,and 88％ respectively.
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