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大粒径透水性沥青混合料(LSPM)不同于传统沥青混合料,它由较大粒径的集料形成骨架和一定量细料进行填充,形成的单粒径骨架嵌挤连通空隙结构,空隙率较高,难以完全使用常规的马歇尔试验方法确定其沥青含量。笔者参考国内外排水性大粒径沥青混合料沥青用量确定方法,考虑沥青被集料吸收的比例,通过沥青膜有效厚度和集料比表面积初步确定沥青用量,提出了其计算方法,并结合设计空隙率、析漏试验与飞散试验综合确定LSPM最佳沥青用量。
Large particle size water-permeable asphalt mixture (LSPM) is different from the traditional asphalt mixture, which consists of a larger particle size aggregates forming skeleton and a certain amount of fines to be filled, forming a single-particle skeleton intruded into the gap structure, the gap Higher rates make it difficult to determine the bitumen content using conventional Marshallian tests. With reference to the method of determining the amount of asphalt used in large drainage asphalt mixture at home and abroad, the proportion of asphalt absorbed by the aggregate is taken into account. The asphalt dosage is calculated based on the effective thickness of the asphalt film and the aggregate specific surface area. Voidage, leak test and flying test were combined to determine the best asphalt dosage for LSPM.