沥青稳定碎石沥青用量确定方法的比较

Compare of Methods Determining Asphalt Content in Asphalt Treated Macadam

分别采用马歇尔法和力学强度指标法对沥青稳定碎石混合料进行沥青用量的确定,分析并比较这两种方法的特点,发现马歇尔法设计结果仅能保证混合料符合体积参数要求,易产生级配粗细与沥青需求相左的矛盾,而力学强度指标法确定的沥青用量则趋于一定的沥青膜厚范围。对于固定的原材料,存在一个较好的级配可以使混合料在最佳沥青用量条件下既满足体积要求又具有较好的抗拉性能。

Marshall method and strength-index method are utilizecl to determine me opnmum asphalt content of ATB respectively. By comparing and analyzing the characteristics of the two methods, the results show that Marshall method only ensures the volume parameter of mixture, but has the contradictory between the aggregations and the need of binders. The optimum binder content determined by strength-index method is prone to some thickness scope of asphalt film. To the same raw materials, aggregations which can both meet the requirement of volume parameter and obtain good strength of tensile are existent.