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根据21种常规级配,制备Superpave旋转压实试件用以评价沥青混合料的级配离析.利用数字图像处理技术,获得试件截面图像,并根据FeretDiameter提取图像中各档粗集料的颗粒信息.改进了结构各向异性的体视学评价方法,提出使用粗集料结构系数Jf作为评价沥青混合料试件级配离析的指标参数.对各级配的Jf值和各档粗集料分计筛余百分率关系进行了线性回归,其复相关系数R达到0.962 1.对于颗粒最大标称粒径相同的级配,使用灰色关联分析,得出结论除颗粒最大标称粒径为9.5 mm级配外,Jf受级配中第3大筛孔分计筛余百分率影响最大.
According to 21 conventional gradations, Superpave rotary compaction specimens were prepared to evaluate the gradation and segregation of asphalt mixture.With digital image processing technology, the cross-sectional images of the specimens were obtained and the particles of the coarse aggregates in each image were extracted according to FeretDiameter The method of stereological evaluation of structural anisotropy was improved and the structural parameter Jf of coarse aggregate was proposed to be used as an index parameter to evaluate gradation and segregation of asphalt mixture specimens.The Jf value of each grade and the coarse aggregate The linear regression of the relationship between the percentage of sifter and sieve was carried out and the complex correlation coefficient R was 0.962 1. Gray correlation analysis was used for the same maximum particle size distribution and the conclusion was that the maximum particle size was 9.5 mm Grades, Jf by grading in the third largest sieve sieve fractional percentage of the most affected.