SAC13沥青混合料动态模量梯形梁试验研究
发布时间：2018-08-20 18:53
【摘要】：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。
[Abstract]:Two kinds of SAC13 asphalt mixture were designed by using 70 # matrix asphalt and SBS modified asphalt. The dynamic modulus of asphalt mixture was studied by trapezoid beam test method. The influence of asphalt material and load level on dynamic modulus and phase angle was investigated. Based on the principle of time-temperature equivalence, the shift factor of the main curve is calculated, the main curves of dynamic modulus and phase angle are drawn, and the dynamic mechanical properties and viscoelastic properties of asphalt mixture are analyzed. Three dimensional principal surface of dynamic modulus is obtained by nonlinear numerical regression. The results show that the main curve can fully reflect the dynamic performance of asphalt mixture, and the pavement performance of asphalt mixture can be improved by improving the performance of asphalt mixture, and under the two-point loading mode, with the increase of strain level, the road performance of asphalt mixture can be improved by improving the performance of asphalt mixture. The influence of strain level on dynamic modulus and phase angle is not constant, especially at high temperature (low frequency). Not only the load exceeds the bearing capacity of the pavement, but also the mechanical properties of the pavement structure are reduced by the increase of the load level.
【作者单位】： 长沙理工大学道路结构与材料交通行业重点实验室;长沙理工大学交通运输工程学院;交通运输部公路科学研究院;
【基金】：国家自然科学基金项目(51678078) 长沙理工大学道路结构与材料交通行业重点实验室开放基金项目(kfj150304)
【分类号】：U414
[Abstract]:Two kinds of SAC13 asphalt mixture were designed by using 70 # matrix asphalt and SBS modified asphalt. The dynamic modulus of asphalt mixture was studied by trapezoid beam test method. The influence of asphalt material and load level on dynamic modulus and phase angle was investigated. Based on the principle of time-temperature equivalence, the shift factor of the main curve is calculated, the main curves of dynamic modulus and phase angle are drawn, and the dynamic mechanical properties and viscoelastic properties of asphalt mixture are analyzed. Three dimensional principal surface of dynamic modulus is obtained by nonlinear numerical regression. The results show that the main curve can fully reflect the dynamic performance of asphalt mixture, and the pavement performance of asphalt mixture can be improved by improving the performance of asphalt mixture, and under the two-point loading mode, with the increase of strain level, the road performance of asphalt mixture can be improved by improving the performance of asphalt mixture. The influence of strain level on dynamic modulus and phase angle is not constant, especially at high temperature (low frequency). Not only the load exceeds the bearing capacity of the pavement, but also the mechanical properties of the pavement structure are reduced by the increase of the load level.
【作者单位】： 长沙理工大学道路结构与材料交通行业重点实验室;长沙理工大学交通运输工程学院;交通运输部公路科学研究院;
【基金】：国家自然科学基金项目(51678078) 长沙理工大学道路结构与材料交通行业重点实验室开放基金项目(kfj150304)
【分类号】：U414
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