均质性对沥青混合料应变场分布的影响

发布时间：2019-05-09 15:59

【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。
[Abstract]:In order to study the influence of asphalt mixture homogeneity on variable field distribution and reveal the relationship between material distribution and strain field distribution, firstly, the strain field distribution of indirect tensile test asphalt mixture was obtained by digital speckle method. The gray distribution of asphalt mixture is compared with that of asphalt mixture. Secondly, the uniformity index-homogeneity index is put forward based on gray scale distribution, and the homogeneity of asphalt mixture with different maximum nominal particle size is evaluated by homogeneity index. Finally, the relationship between homogeneity and strain field distribution of asphalt mixture is established through homogeneity index. The results show that the gray value in the local peak region of the strain field varies greatly, while the gray value in the valley value region changes little. Homogeneity index method is an effective method to characterize the local distribution uniformity of materials. Under the same evaluation scale, the uniformity of small particle size asphalt mixture is better. The peak value of strain field is produced in the local region with large homogeneity index, and the valley value of strain field is produced in the area with small homogeneity index.
【作者单位】：哈尔滨工业大学交通科学与工程学院;辽宁省交通科学研究院;
【基金】：国家杰出青年科学基金项目(51225803)
【分类号】：U414

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