排水沥青混合料配合比对磨耗和飞散特性的影响

采用磨耗(raveling)试验和肯特堡(Cantanbro)飞散试验,考察了粗集料、细集料、结合料的不同配合比和排水沥青混合料的不同空隙率对排水沥青混合料磨耗和飞散特性的影响.结果表明,粗集料用量在78%~86%(质量分数,下同)之间变动、细集料用量在9%~17%之间变动对排水沥青混合料的磨耗和飞散特性没有明显影响,但结合料用量在4%~6%之间变动则有明显影响,即随着结合料用量增加,排水沥青混合料的耐磨耗和抗飞散性得到提高;空隙率对排水沥青混合料的磨耗和飞散特性也有明显影响,但其实验数据较分散.所以,为了确保排水沥青路面的路用性能,在集料、级配和结合料选定后,对于结合料用量和空隙率的控制是至关重要的.

Influence of Mix Proportion on Abrasion and Stripping Characteristics of Drainage Asphalt Pavement

Using raveling test and Cantanbro stripping test,influences of mix proportion of coarse aggregate,fine aggregate and binder as well as the different voids on characteristics of abrasion and stripping resistance of drainage asphalt mixtures were studied.Experimental results show that content of coarse aggregate,which varies from 78% to 86%(by mass),and content of fine aggregate,which varies from 9% to 17%(by mass),have little influences on abrasion and stripping of drainage asphalt mixtures.However,content of binder when they varies from 4% to 6%(by mass) has significant influences on abrasion and stripping of drainage asphalt mixtures,i.e.,with increasing contents of binder,properties of abrasion and stripping are improved.Besides,the influence trend of voids on abrasion and stripping is also evident although data are relatively scattered.Therefore,in order to ensure good performances of drainage asphalt pavements,once the aggregate and gradation,binder types for use in engineering have been determined,controlling contents of binder and reasonable voids become very important.