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选用70~#基质沥青和SBS改性沥青设计了两种SAC13沥青混合料,使用梯形梁试验方法进行了动态模量试验研究,考察了沥青材料和荷载水平对动态模量及相位角的影响。基于时温等效原理,计算了主曲线移位因子,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和黏弹性能;利用非线性数值回归得到了动态模量三维主曲面。结果表明:主曲线能够较为全面地反映沥青混合料的动力学性能,通过改善沥青材料性能可以提高沥青混合料的路用性能;在两点加载模式下,随着应变水平的增加,动态模量减小,相位角增大;应变水平对动态模量和相位角的影响并非恒定,在高温(低频)时,应变水平的影响更加显著;超载会显著加速路面损坏,不仅仅因为荷载超过了路面承载力,而且因为荷载水平的增加降低了路面结构本身的力学性能。
Two kinds of SAC13 asphalt mixture were designed using 70 ~ # asphalt and SBS modified asphalt, and the dynamic modulus test was conducted using the trapezoidal beam test method. The influence of asphalt material and load level on the dynamic modulus and phase angle was investigated. Based on the time-temperature equivalent principle, the main curve displacement factor was calculated and the main curves of dynamic modulus and phase angle were plotted. The dynamic mechanical properties and viscoelastic properties of asphalt mixture were analyzed. The dynamic modulus Three-dimensional main surface. The results show that the main curve can reflect the dynamic performance of asphalt mixture more completely and can improve the road performance of asphalt mixture by improving the performance of asphalt material. Under the two-point loading mode, with the increase of strain level, the dynamic modulus Decreases and the phase angle increases. The effect of strain level on dynamic modulus and phase angle is not constant. The effect of strain level at high temperature (low frequency) is more significant. Overloading can significantly accelerate pavement damage, not only because the load exceeds the pavement Bearing capacity, but also reduce the mechanical properties of pavement structure because of the increase of load level.