基于图像的AC20型混合料集料接触分布变异性

为量化集料之间的接触关系,提出了一种基于数字图像的沥青混合料集料接触分析方法,以AC20型沥青混合料为例,对72个车辙板试件切片图像进行处理,得到每个切片上集料接触数量及集料特征;通过统计分析,得到AC20型沥青混合料接触对总体分布规律,各档集料的接触对分布规律及单颗集料接触数分布规律;并分析了大于2.36 mm集料含量C>2.36,集料级配的细度指数FI和离析指数SI对样本接触对数量变异性的影响规律及这三个指标的内在联系.通过对AC20型沥青混合料接触状况的量化分析,可将接触特征作为混合料级配设计的参考因素,指导级配设计.

Variation of Aggregate Contacts Distribution in AC20 HMA Based on Digital Image Processing

In order to quantify the contacts between the aggregates,a new method based on digital image processing was put forward.For AC20 HMA,the amount of aggregates contacts and the features of the aggregates on all sample images acquired from 72 cut sections of rutting test samples were obtained through this method,and then the global contacts distribution rules of all aggregates,the local contacts distribution rules of each grades aggregates and the single particle contacts number distribution rules of each grades aggregates were acquired from statistical analysis.The variation of contacts amount on each images and influence factors including the content of aggregates above 2.36 mm(C>2.36),the fine index of aggregates above 2.36 mm(FI) and the segregation index(SI) were discussed.The internal relations of these three factors were as well analyzed.Contact features can be used for hot-mixture asphalt(HMA) gradation design as a referenced factor through these quantified analysis.