空隙率与沥青混凝土渗排水性能的关系研究

Study on the Relationship between Void Ratio and the Performance of Water Seepage and Drainage of Asphalt Concrete

沥青路面的水损害与沥青混凝土的空隙率有密切关系,路面在施工中乃至产生裂缝后的使用中,空隙率的变化范围是比较大的。针对AC-13、SMA-13两种典型的上面层沥青混凝土,分别设计了6种不同空隙率,针对横向排水,设计5种横坡度并进行了竖向渗水以及横向排水性能试验研究。结果表明:连通空隙率与空隙率有着良好的线性关系;AC-13和SMA-13的竖向渗水系数和横向渗透系数均随着空隙率的增大呈三阶段变化特征,分别给出了三个阶段的空隙率范围,对比发现竖向渗水系数与横向渗透系数三个变化阶段所对应的空隙率变化范围基本一致;与AC-13相比,SMA-13的渗水系数和渗透系数对空隙率的变化更加敏感;结合《公路沥青路面施工技术规范》对渗水系数的要求,借鉴《透水水泥混凝土路面技术规程》对渗透系数的要求,分析了沥青混凝土的空隙率范围,为沥青路面施工与使用中的空隙率控制提供指导。

The water damage of asphalt pavement is closely related to the void ratio of asphalt concrete,in pavement construction and even after cracking,the variation range of void ratio is relatively large.For the typical upper asphalt concrete specimens of AC-13 and SMA-13,six kinds of void ratios are designed,and five kinds of transverse slopes are designed for the transverse drainage test.The vertical seepage and transverse drainage performance tests are carried out.It is found that:there is a good linear relationship between the connected void ratio and the void ratio;the vertical water seepage coefficient and transverse permeability coefficient of AC-13 and SMA-13 show three stages of variation along with the increase of void ratio,and the three stages void ratio range is given separately,the comparison shows that the variation ranges of void ratio range corresponding to the three stages of vertical water seepage coefficient and transverse permeability coefficient are basically the same.Compared with AC-13,the vertical water seepage coefficient and transverse permeability coefficient of SMA-13 are more sensitive to the change of void ratio;combined with the requirements of asphalt pavement construction technical specifications for vertical water seepage coefficient,drawing on the requirements of the permeability specification for the Technical Regulations for transverse permeability coefficient,the seepage and drainage performances of asphalt concrete are analyzed to provide guidance for the construction control of asphalt pavement void ratio.