Electrical and Piezoresistive Properties of Steel Fiber Cement-based Composites Aligned by a Magnetic Field  

作　　者：LIU Liyuan XU Jinxia WANG Yang YIN Tianjiao CHU Hongqiang 刘力源;徐金霞;WANG Yang;YIN Tianjiao;CHU Hongqiang(College of Mechanics and Materials,Hohai University,Nanjing 211100,China)

机构地区：[1]College of Mechanics and Materials,Hohai University,Nanjing 211100,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2022年第2期229-240,共12页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(Nos.51478164 and 52079048);the Key Research&Development Plan of Jiangsu Province,China(No.BE2021704)。

摘　　要：Directionally distributed steel fiber cement-based composites(SFCCs)were prepared by magnetic field(MF)induction technology.The orientation factor of steel fibers in the as-obtained SFCCs was determined.Besides,the electrical resistivity and piezoresistive responses in two directions of aligned steel fiber cement-based composites,i e,parallel and perpendicular to MF,were measured.The effects of several variables,eg,steel fiber content,curing age,humidity,and temperature,on anisotropic electrical property were studied.The cyclic and failure piezoresistive responses in different directions were tested.It is found that the aligned steel fibers in the as-obtained SFCCs have a high orientation factor more than 0.88.Besides,SFCCs with aligned steel fibers exhibit an obvious anisotropic conductivity and piezoelectric sensitivity.The electrical conductivity of SFCCs with aligned steel fibers is less affected by temperature and humidity.At the steel fiber content of 2.5wt%,the piezoelectric sensitivity coefficient of SFCCs in the direction parallel to MF has the highest value of 324.14.In addition,the piezoresistive properties of SFCCs with aligned steel fibers in the direction parallel to MF indicate excellent sensitivity and stability under cyclic loading and monotonic loading.

关 键 词：electrical resistivity aligned steel fiber PIEZORESISTIVITY cement-based composites 

分 类 号：TB332[一般工业技术—材料科学与工程] TU528[建筑科学—建筑技术科学]