基于数字图像相关方法的沥青混合料颗粒运动轨迹分析

Calculation of Movement Track of Coarse Aggregate of Asphalt Mixtures Based on Digital Image Correlation Method

基于数字图像相关方法以及四点弯曲疲劳试验,开发了一种专门用于追踪沥青混合料内部粗集料运动轨迹的新方法.采用CCD数码相机记录AC-16型沥青混合料试件的疲劳破坏过程.试验结果表明,新的观测与计算方法可以很好的描述不同荷载周期下粗集料的位移过程;粗集料的运动趋势也反映了试件裂缝的影响.与原有计算方法相比,新的计算方法可以提供不同材料的详细运动信息(包括集料以及沥青胶浆).

Based on digital image correlation method （DICM ） ,this paper promotes a new method for tracking the movements of coarse aggregates of asphalt mixtures .The four‐point bending fatigue test is applied as the observed test .The fatigue damage process of AC‐16 asphalt mixture is observed by CCD camera .Results show that the new method is able to well reflect the exact displacement of coarse aggregates under different loading repetitions .And the movement trends also reflect the influences of cracks in the specimens . Compared to the original method , the new method provides more detail movement information of different materials （aggregates and asphalt binder） .This method helps to the research of asphalt mixtures in meso‐scale .