Effect of a Carbon Fibre-steel Fibre-graphite Conductive Filler on the Electrothermal Properties of Cementitious Materials  

作　　者：FAN Yanan WEI Hong ZHENG Hongyong DU Hongxiu 樊亚男(Department of Architecture and Environmental Engineering,Taiyuan University,Taiyuan 030032,China)

机构地区：[1]Department of Architecture and Environmental Engineering,Taiyuan University,Taiyuan 030032,China [2]College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030032,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2025年第1期141-151,共11页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Key R&D Projects of Shanxi Province(No.201903D321113);the Shanxi Provincial Natural Science Foundation(No.202303021212359);the General Research Projects of Taiyuan University(No.23TYYB07)。

摘　　要：Carbon fibre,steel fibre and graphite were used as conductive fillers to prepare cementitious materials with excellent electrothermal properties.The electrically conductive cementitious materials with different volume dosages were analysed through compressive and flexural strength,electrochemical impedance spectroscopy and temperature rise tests.An equivalent circuit model was established to study the electrically conductive heat generation mechanism in the electrically conductive cementitious composites.The results indicate that the mechanical properties of cementitious composite materials with a ternary conductive phase are better than those of pristine cementitious materials because the fibrous filler improves their mechanical properties.However,the incorporation of graphite in the material reduces its strength.Introducing fibrous and point-like conductive phase materials into the cementitious material enhances the overall conductive pathway and considerably reduces the electrical resistance of the cementitious material,enhancing its conductive properties.The volume ratios of carbon fibre,steel fibre and graphite that achieve an optimal complex doping in the cementitious material were 0.35%,0.6%and 6%,respectively.This was determined using the mutation point of each circuit element parameter as the percolation threshold.In addition,at a certain safety voltage,there is a uniform change between the internal and surface temperatures of the conductive cementitious material,and the heating effect in this materialis is considerably better than that in the pristine cementitious material.

关 键 词：cementitious composites conductive fillers electrothermal properties electrochemical impedance spectroscopy 

分 类 号：TB34[一般工业技术—材料科学与工程]