MA Shibin¹,JIANG Jiajun¹,ZHOU Wenqiang²,LIANG Dong¹,YANG Linsen¹

(1.School of Civil and Transportation,Hebei University of Technology,Tianjin 300401,China; 2.Guangzhou Yatai Architectural Design Institute Co.Ltd.,Wuxi 214000,China)

Abstract：Prefilled aggregate concrete (PAC) is easy to produce pores because of its unique production process,which affects its macro performance.In order to investigate the influence of microstructures such as porosity and pore morphology of PAC on its macroscopic mechanical properties,the compressive strength and flexural and tensile strength tests of PAC with different levels were carried out first,and then the specimens were scanned by CT(computed tomography) technology.Based on the computer image processing technology and three-dimensional visualization model,the difference analysis of pore structure characteristics in two and three dimensions was carried out,and the influence of the characteristics parameters of PAC microstructure on its macroscopic mechanical strength was explored by the grey correlation method.The results show that the flexural and tensile strength of PAC develops rapidly in the early stage,and different stages have certain effects on the flexural and tensile strength of PAC.The gray correlation degree between pore size and mean pore sphericity is above 0.8,which has a close relationship with strength development,and pore size has the greatest influence on strength.

Keywords：preplaced aggregate concrete;mechanical properties;pore structure;computed tomography

Get Citation: MA S B,JIANG J J,ZHOU W Q,et al.Pore structure characteristics of prefilled aggregate concrete based on CT technology[J].China Powder Science and Technology,2023,29(3)：47-62.

Received： 2022-10-11,Revised：2022-12-08,Online：2023-04-11：09：46。

Funding Project：国家自然科学基金项目,编号：51978236;天津市交通运输科技发展计划项目,编号：2022-01。

First Author：马士宾(1973—),男,教授,博士,硕士生导师,研究方向为路基路面材料以及桥梁施工。E-mail：marotolo@hebut.edu.cn。