Theoretical Calculation of ITZ Volume Fraction and Morphological Characterization of Crushed Stone in Concrete  

作　　者：ZHANG Jianjian PENG Liang ZHANG Guoqiang SUN Guowen LIU Zhiyong 张建建;PENG Liang;ZHANG Guoqiang;孙国文;LIU Zhiyong(School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Materials Science and Engineering,Shijiazhuang TieDao University,Shijazhuang 050043,China;Foundational Subjects Department,Shijiazhuang TieDao University SiFang College,Shijiazhuang 051132,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China [2]School of Materials Science and Engineering,Shijiazhuang TieDao University,Shijazhuang 050043,China [3]Foundational Subjects Department,Shijiazhuang TieDao University SiFang College,Shijiazhuang 051132,China [4]School of Materials Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2022年第4期656-665,共10页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundations of China(No.52178237);the Graduate Innovation Fund of Shijiazhuang Tie Dao University(YC2021064)。

摘　　要：According to the morphological characteristics of crushed stone,the sphericity was introduced to establish the theoretical calculation model of volume fraction of interfacial transition zone(ITZ)around crushed stone.The sphericity of crushed stone was obtained by image processing technology and numerical statistics.The experimental results show that when the maximum particle size of coarse aggregate is less than 31.5 mm,the practical sphericity is generally around 0.75,while the sphericity of sand is generally above 0.85.And the closer to 1 the practical sphericity is,the smaller the ITZ volume fraction(V_(ITZ))is,that is,the closer to spherical shape the aggregate is,the lower the ITZ content in concrete is.The V_(ITZ) and ITZ thickness in concrete and mortar have a linear relationship,and the ITZ content in concrete is lower than that in mortar at the same aggregate volume fraction.

关 键 词：crushed stone SPHERICITY interfacial transition zone image processing CONCRETE 

分 类 号：TU528[建筑科学—建筑技术科学]