沥青道面修补材料和易性指标及影响因素

Workability index and influence factors of asphalt pavement repair material

按照马歇尔设计方法,双面击实75次,在进行机场沥青道面修补材料配合比设计的同时,测试马歇尔试件双面击实50次的空隙率和试件高度,提出了机场沥青混合料施工和易性的评价指标"h0",将其作为配合比设计的一个参考指标,并分析了油石比、级配组成以及击实温度对机场沥青混合料施工和易性的影响。试验研究表明:沥青用量越多,施工和易性越好,粗集料用量越多,施工和易性越差,温度越高,施工和易性越好。

According to Marshall Design method, after 75 times compaction for each face of Marshall sample, the propor- tion design of asphalt pavement repair material is presented. Void volume and height of Marshall sample with 50 times compacted are tested, evaluation indexes of workability ＂ho＂ for airport mix asphalt is proposed. ＂ho＂ is re- garded as one of the proportion design indexes. The influence of bitumen aggregate ratio, gradation composition and compaction temperature to workability of airport mix asphalt are analyzed. These studies indicate that the more bitumen, the better workability is, the more coarse aggregate, the worse workability is, the higher tempera- ture, the better workability is.