论文部分内容阅读
为了解沥青砂的复杂力学行为,给沥青混合料细观力学研究提供数据支持,将几种沥青混合料的配合比转变为沥青砂的配比,采用自主研发的沥青砂成型装置及流变仪夹具获取沥青砂的动态剪切蠕变曲线,基于Burgers模型对蠕变曲线进行拟合,获取动态剪切荷载下沥青砂的黏弹性参数,分析黏弹性参数及松弛模量的变化规律。试验结果显示,Burgers模型对沥青砂动态剪切蠕变曲线具有较好的拟合效果。相同加载时间内,相比于AC-20级配沥青混合料,SMA-16级配沥青混合料蠕变变形量更大。橡胶沥青砂的抗剪切蠕变性能最优。沥青砂蠕变变形影响规律与混合料车辙变形一般影响规律相符。试验温度、沥青用量、沥青种类和级配类型均对沥青砂的黏弹性参数和松弛模量影响显著。
In order to understand the complex mechanics behavior of asphalt sand, this paper provides data support for the research of meso-mechanics of asphalt mixture, and changes the mixing ratio of several asphalt mixtures into the ratio of asphalt sand. Using self-developed tar sand molding equipment and rheometer The dynamic shear creep curve of asphalt sand was acquired by the jig, the creep curve was fitted based on the Burgers model, the viscoelastic parameters of tar sands under dynamic shear loading were obtained, and the variation of viscoelastic parameters and relaxation modulus were analyzed. The experimental results show that the Burgers model has a good fitting effect on the dynamic shear creep curve of asphalt sand. In the same loading time, the creep deformation of SMA-16 gradation asphalt mixture is larger than that of AC-20 gradation asphalt mixture. Rubber asphalt sand has the best shear-creep resistance. The law of creep deformation of asphalt sand and the general influence law of rut deformation of mixture are consistent. The test temperature, the amount of asphalt, the type of asphalt and the type of gradation all have significant influence on the viscoelastic parameters and relaxation modulus of asphalt sand.