基于不同成型方法的沥青碎石混合料性能对比

Performance comparison of asphalt macadam mixtures based on different molding methods

为研究不同成型方法对沥青碎石混合料性能的影响及相关试验指标,分别采用旋转压实法、振动压实法与大型马歇尔击实法成型沥青碎石混合料试件,对试件各项马歇尔指标与采用不同振动时间成型的试件体积指标进行了对比分析,并根据压实功相同原理,提出了基于旋转压实成型法和振动压实成型法设计的4个指标范围。对比分析结果表明,2种方法的指标范围基本相同,仅沥青饱和度下限有5%差别;同时强调,在施工碾压时需保证足够的压实时间,才能使沥青碎石混合料达到预期的设计效果。

In order to study the influences of different molding methods on the performances of asphalt macadam mixtures and the indices of mixture tests, three molding methods were utilized, including large scale Marshall molding method, rolling molding method and vibrating molding method, the Marshall indices of asphalt macadam mixtures compacted by the three methods were compared, and the volume indices of asphalt macadam mixtures with different vibration times were analyzed. Based on the principle of same compaction power, the ranges of four indices designed by using rolling molding method and vibrating molding method were put forward aimed at asphalt macadam mixtures. Test result shows that the ranges of different indices aimed at the two methods are nearly same, only with a difference of 5% in asphalt saturation degree, and enough compaction time is required for asphalt macadam mixtures in construction and compaction, so that they have good road performances. 9 tabs, 2 figs, 12 refs.