【摘 要】
：
为了研究应变水平对沥青混合料动态模量的影响及弯拉作用下的沥青混合料动态力学性能,使用两点弯曲试验方法对两种沥青混合料进行了不同应变水平下的动态模量试验。结果表明:
【机 构】
：
长沙理工大学交通运输工程学院,道路结构与材料交通行业重点实验室(长沙),交通运输部公路科学研究院,
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为了研究应变水平对沥青混合料动态模量的影响及弯拉作用下的沥青混合料动态力学性能,使用两点弯曲试验方法对两种沥青混合料进行了不同应变水平下的动态模量试验。结果表明:应变水平越大,沥青混合料的动态模量越小,相位角越大。根据时温等效原理,计算了主曲线的移位因子lg(αT),绘制了动态模量和相位角主曲线,分析了沥青混合料的动态力学性能。通过二元二次多项式回归把主曲线扩展至三维主曲面。研究结果表明:应变水平对沥青混合料的动态模量和黏弹性有显著影响,超载将加速沥青路面的损害。
In order to study the influence of strain level on the dynamic modulus of asphalt mixture and the dynamic mechanical properties of asphalt mixture under bending and bending, the two-point bending test was used to test the dynamic modulus of asphalt mixture at different strain levels. The results show that the larger the strain level, the smaller the dynamic modulus of asphalt mixture and the larger the phase angle. According to the time-temperature equivalent principle, the displacement factor lg (αT) of the main curve was calculated. The main curves of dynamic modulus and phase angle were plotted, and the dynamic mechanical properties of asphalt mixture were analyzed. The main curve is extended to the three-dimensional main surface by binary quadratic polynomial regression. The results show that: the strain level has a significant impact on the dynamic modulus and viscoelasticity of asphalt mixture, and overload will accelerate the damage of asphalt pavement.
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