基于分形理论半柔性沥青路面低温性能研究

3.广西交通职业技术学院，广西 南宁  530023）

    摘要：为评价灌注式半柔性路面结构的抗低温性能，通过对S1~S5不同矿料级配组合配制空隙率为28%的基体沥青混合料进行低温抗裂性能测试，采用分形理论计算了沥青混合料基的分形维数，根据沥青混合料低温抗裂试验结果建立其与劈裂强度、破坏拉伸应变以及劲度模量之间的回归关系。结果表明：S1~S5不同矿料级配的分形维数具有一定的线性相关性；沥青混合料基灌注式半柔性材料的劈裂强度与破坏拉伸应变随着矿料组的变化先增大后减小，劲度模量先减小后增大，根据回归公式，可以对不同矿料级配组合配制空隙率为28%基体沥青混合料的低温抗裂性进行预测。

    关键词：灌注式半柔性；粒径分布分形；级配设计；低温抗裂性能

    中图分类号：TU528.42        文献标识码：A        文章编号：1001-702X（2018）05-0022-04

 

 Low temperature resistance of semi- flexible pavement structure based on fractal theory

LI Chun1，2，QIN Feng3

（1.Guangxi Transportation Research Institute，Nanning 530007，China；

2.Guangxi Key Lab of Road Structure and Material，Nanning 530007，China；

3.Guangxi Vocational and Technical College of Communications，Nanning 530023，China）

  Abstract：In order to evaluate the low temperature resistance of the semi-flexible pavement structure，the low temperature crack resistance test of the asphalt mixture with 28% porosity was prepared by combining five different mineral grades with S1~S5. The fractal dimension of asphalt mixture was established，and the regression relationship between splitting strength，breaking tensile strain and stiffness modulus was established according to the results of low temperature crack resistance test of asphalt mixture. The results show that the fractal dimension of five different mineral gradients has a certain linear correlation. The splitting strength and failure tensile stress of the semi-rigid materials increases first and then reduces with the change of the aggregate group. The stiffness modulus first decreases and then increases with the change of the aggregate group. Based on the regression formula proposed in this paper，the low temperature crack resistance of matrix asphalt mixture with 28% porosity prepared by combining five different mineral grades can be predicted. 

    Key words：perfusion semi-flexible，particle size distribution fractal，gradation design，low temperature crack resistance