宽域空隙率沥青混合料设计方法及空隙-骨架结构参数分析OA

To systematically investigate the void and skeleton structural characteristics of asphalt mixtures across a wide range of void ratios,the main skeleton void filling method was improved based on the gradual packing theory,and a void ratio-based design method for skeleton-type asphalt mixtures was established.Using this method,specimens with four void ratios,i.e.,4%,11%,14%,and 18%were prepared.The void structure was quantitatively analyzed,and complex network theory was introduced to characterize the skeleton structure.The results indicate that the two-dimensional void ratio within the specimens exhibits a distribution pattern of higher values at the top and bottom and lower values in the middle along the height direction,and the average void radius and coordination number show a consistent trend.The permeability of the mixture increases exponentially with increase of the void ratio.In terms of mesoscopic skeleton structure,the aggregate degree distribution is uniform,indicating good structural integrity.However,as the void ratio increases,both the particle node degree and clustering coefficient of the skeleton network gradually increase,while the shortest path length first decreases and then increases,which suggests that excessively high void ratios can weaken the overall integrity of the skeleton.The void ratio significantly influences the void structure and skeleton connection characteristics of the mixture,providing an basis for the design of asphalt mixtures.