1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 State Key Laboratory of High Performance Civil Engineering Materials Gansu Research Base, Lanzhou 730050, China
Abstract: At present, the research on the morphology of manufactured sand often focuses on the macro parameters represented by sphericity, which may be a certain one-sided in this. To comprehensively study the morphology of manufactured sand from macro to micro, the sand morpho-logy parameters are decomposed into the following four dimensions:sphericity, convex ratios, roughness and specific surface area. Based on CT scanning, digital images of sand samples of 2 particle sizes and 3 lithologies were collected, and the sand morphology parameters were calcula-ted quantitatively after the image was processed by Avizo and Matlab software; the function formula of morphology parameters was established, and the relationship between the four dimensional parameters was revealed. It is found that:the image processing method can calculate the sand morphology parameters with high accuracy; after magnifying the sand surface 50 and 200 times by SEM, it can be further found that the convex ratios is suitable for describing the sand morphology at a magnification of 50 times, and the surface roughness is suitable for describing the sand morphology at a magnification of 200 times; sphericity, convex ratios, and roughness are independent of particle size, the specific surface area is inversely proportional to particle size; it is concluded that sphericity and convex ratios obey Weibull distribution, while roughness and specific surface area obey normal distribution.
通讯作者:
*张云升,兰州理工大学土木工程学院教授、博士研究生导师,长江学者。2004年毕业于东南大学,获得工学博士学位。目前主要从事机制砂高性能混凝土、新型建筑材料及制品、工业废渣资源化利用等方面的工作。发表SCI及EI学术论文共160余篇,包括Cement and Concrete Research、Cement and Concrete Composites、Construction and Building Materials等。zhangyunsheng2011@163.com
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2023, Vol. 37 
