中文摘要：

为研究沥青混合料均质性对应变场分布影响,揭示材料分布与应变场分布之间的关系,首先,采用数字散斑方法得出间接拉伸试验沥青混合料应变场分布,并与沥青混合料灰度分布进行对比;其次,基于灰度分布提出均匀性评价指标——均质性指数,并通过均质性指数评价不同最大公称粒径沥青混合料均匀性;最后,通过均质性指数建立沥青混合料均匀性与应变场分布之间的联系。结果表明：应变场局部峰值区域灰度值变化较大,谷值区域灰度值变化较小;均质性指数方法是一种有效表征材料局部分布均匀性方法,相同评价尺度下,小粒径沥青混合料均匀性较好;均质性指数大的局部区域产生应变场峰值,均质性指数小的区域产生应变场谷值。

英文摘要：

In order to research the effect of homogeneity on asphalt mixture strain field distribution and reveal the relationship between material distribution and strain field distribution,firstly,the strain field distribution of asphalt mixture in the indirect tensile test was obtained by digital image correlation method,and it was compared with gray level distribution.Secondly,the homogeneity index was proposed based on the gray level distribution for homogeneity evaluation,and the homogeneities of asphalt mixtures with different nominal maximum aggregate sizes were evaluated by homogeneity index.Finally,the relationship between homogeneity of asphalt mixture and strain field distribution was established by homogeneity index.The results show that greater gray level change appears in peak area of strain field,and there is smaller the gray level change in valley area of strain field.Homogeneity index method is effective for evaluating the local homogeneity of asphalt mixture.The homogeneity of the asphalt mixture with smaller nominal maximum aggregate size is better in the same evaluation scale.The peak value of strain field appears in the local area with higher homogeneity index,and the valley value of strain field appears in the area with lower homogeneity index.