沥青混合料旋转压实密实曲线信息及其应用

为了在配合比设计阶段预测沥青混合料的可施工特性和路用性能,采用高性能沥青路面(Superpave)旋转压实仪SGC对美国战略公路研究计划(SHRP)中推荐的粗、细沥青混合料进行了旋转压实,对密实曲线作了深入分析,提出了密实曲线斜率和密实能量指数概念以反映沥青混合料的内在信息。采用该方法对两种级配沥青混合料施工可压实特性和抵抗交通荷载抗变形能力进行了分析并结合车辙试验和试验路对指标的合理性进行了验证,研究表明:粗型级配沥青混合料的抗变形能力未必优于细型级配沥青混合料。

Information of gyratory compaction densification curve of asphalt mixture and its application

In order to predict the workability and field performance of asphalt mixture in mix design phase,two asphalt mixtures of different gradation are compacted using SHRP gyratory compactor,and their densification curves are analyzed.The slope of densification curve and densification energy index are introduced to reflect inherent information of asphalt mixture.Furthermore,the two parameters are used to analyze compaction workability and rutting behavior of two mixtures.Rutting test and trial roads are also adapted to evaluate the rationality of the parameters.Test results and analysis indicate that the deformation resistance of coarse gradation mixture is not always higher than that of fine gradation mixture.