考虑均匀性的SMA混合料最佳沥青用量确定方法

发布时间：2018-10-24 16:38

【摘要】：为更为准确地确定SMA混合料最佳沥青用量,利用CT技术识别SMA混合料各组分内部结构特征,分析SMA混合料的马歇尔设计方法中主要体积参数与其内部结构各组分特征的关系,考虑混合料内部结构均匀性,建立SMA混合料最佳沥青用量确定方法,并选用3种混合料类型(SMA-13、SMA-16和SMA-20)对该方法的有效性进行验证.结果表明,基于CT技术获取不同沥青用量条件下的SMA混合料空隙率可以较好地表征通过密度试验所得SMA混合料空隙率,并以此分析计算得到的间隙率和饱和度与马歇尔体积设计方法中的差值平均值分别为0.35%和1.45%;采用建立的最佳沥青用量确定方法与根据现行马歇尔设计方法分析得到的SMA-13、SMA-16和SMA-20三种混合料最佳沥青用量差值分别为0.08%、0.18%和0.15%,表明了该方法的有效性.
[Abstract]:In order to determine the best asphalt content of SMA mixture more accurately, the internal structural characteristics of each component of SMA mixture are identified by CT technology, and the relationship between the main volume parameters of SMA mixture and the characteristics of each component of internal structure in Marshall design method of SMA mixture is analyzed. Considering the homogeneity of the internal structure of the mixture, the method of determining the optimum asphalt content of SMA mixture is established, and the validity of the method is verified by three kinds of mixture types (SMA-13,SMA-16 and SMA-20). The results show that the voidage of SMA mixture with different asphalt content can be obtained by CT technology, and the porosity of SMA mixture obtained by density test can be well characterized. The average value of the difference between the clearance rate and saturation and the Marshall volume design method is 0.35% and 1.45% respectively, and the optimum asphalt content is determined by the established method and analyzed according to the current Marshall design method. The difference between the optimum asphalt content of SMA-13,SMA-16 and SMA-20 is 0.08% and 0.15% respectively, which shows the effectiveness of this method.
【作者单位】：大连海事大学道路与桥梁工程研究所;哈尔滨工业大学交通科学与工程学院;
【基金】：国家自然科学基金资助项目(51308084) 辽宁省公路科研项目(201503) 中央高校基本科研业务费专项资金资助项目(3132017029)
【分类号】：U414

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