Shape characterization of sand particles based on digital image processing technology  

基于图像处理技术的砂颗粒形貌表征

作　　者：Zhou Xinwen Liu Jianzhong Zhu Jiang Mao Yonglin Liu Jiaping 周新文;刘建忠;朱江;毛永琳;刘加平(东南大学材料科学与工程学院,南京211189;江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,南京210008;重庆大学材料科学与工程学院,重庆400044;江苏苏博特新材料股份有限公司,南京211103)

机构地区：[1]School of Materials Science and Engineering,Southeast University,Nanjing 211189,China [2]State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science,Nanjing 210008,China [3]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [4]Sobute New Materials Co.,Ltd.,Nanjing 211103,China

出　　处：《Journal of Southeast University(English Edition)》2020年第3期313-321,共9页东南大学学报（英文版）

基　　金：The National Key Research and Development Program of China(No.2017YFB0310100);the National Natural Science Foundation of China(No.51978318)。

摘　　要：To characterize the shape of sand particles for concrete,a new method is proposed based on digital image processing(known as the DIP method).By analyzing sand particles projection,the length,width and thickness of sand were measured to characterize particle form.The area and perimeter were measured to characterize particle angularity.The results of the DIP method and Vernier caliper were compared to examine the accuracy of the DIP method.The sample size test was conducted to show the statistical significance of shape results measured by the DIP method.The practicality of the DIP method was verified by instance analysis.The results show that aspect ratios and roundness measured by the DIP method are equal to ones by the Vernier caliper.Results by DIP are dependent on the sand particle number,and at least 350 particles should be measured to represent the overall shape property of sand.The results show that the DIP method is able to distinguish the differences in the shape of sand particles.It achieves the direct measurement of sand particle thickness,and the characterization results of sand aspect ratios and roundness are accurate,statistically significant and practical.Therefore,the DIP method is suitable for sand particle shape characterization.为表征砂颗粒形貌,提出了一种评价颗粒形貌的DIP方法.通过分析采集到的砂粒投影图获取颗粒的长、宽和高,进而计算砂粒轴径比,同时获取颗粒投影的面积与周长来计算砂粒圆形度.将DIP方法和游标卡尺测量结果进行对比,验证所提方法的测量准确性;通过样本容量试验分析该方法测量结果的统计意义;利用该方法实际测量各类砂形貌,检验了该方法的可操作性.试验结果表明:DIP方法测量得到的几何体轴径比和圆形度与游标卡尺测量结果相同;DIP方法表征结果受颗粒数目影响,当颗粒数目达到350时测量结果有代表性.实例分析结果表明,DIP方法能够区分各类砂的形貌差异,实现了对颗粒厚度的直接测量,准确表征了砂粒轴径比与圆形度,测量结果具有统计意义,可行性高,适用于砂颗粒形貌的定量表征.

关 键 词：particle shape SAND FORM ANGULARITY digital image processing 

分 类 号：TU521[建筑科学—建筑技术科学]