半柔性复合路面基体沥青混合料设计方法

Design method of mother-asphalt-mixture for semi-flexible pavement

半柔性路面是一种在开级配沥青混合料中填充水泥胶浆而形成的一种路面结构,它兼具有沥青路面与水泥砼路面的特点.其材料结构属于骨架-密实结构,作为其基体的沥青混合料则属于骨架-空隙结构.为了使基体沥青混合料具有较好的体积特征和良好的路用性能,在国内外研究成果的基础上,提出了以空隙率19%~21%、马歇尔稳定度大于3kN和流值40~55为主要考核目标值,采用正交试验设计基体沥青混合料的设计方法,获得了基体沥青混合料的最佳配比范围.并经过试验研究,验证了其有效性.

Semi-flexible pavement is generally described as a composition pavement that possess the characteristic of asphalt concrete and Portland cement concrete,which is filled with Portland cement grout in open-graded basic-asphalt-mixture.It is a void-closed framework structure.However,its basic-asphalt-mixture is framework-void texture.To make the basic-asphalt-mixture have good volume character and performance,based on the local condition of China and referring to the domestic-overseas study,the design method of basic-asphalt-mixture based on the orthogonal test design method is presented,which uses the void 19%～21%,Maxshell stability >3MPa and fluid 40～55 as the design target value,through which the best range of mixture grade and asphalt contents have been acquired,and the validity of the design method has been validated by means of the test.