摘要
制备了多层石墨烯(MG)/钢纤维(SF)复合砂浆。利用四电极法测试复合砂浆的电阻率,研究了测试时间、MG和SF掺量、养护龄期和含水量对砂浆电阻率的影响,并通过扫描电镜观察多层石墨烯在砂浆中的微观形貌。结果表明:砂浆外通电流后,内部产生的极化效应导致测试电阻率随导电时间增长而增大,导电填料抗氧化性越强,极化效应越小;砂浆的电阻率随MG和SF掺量的变化出现了渗流现象,运用GEM理论拟合了单掺MG和SF砂浆的电导率与其掺量的关系;MG和SF的协同作用可以增加导电链条、提高导电能力,其中复掺SM比单掺MG电阻率降低21.7%~41.8%;养护龄期越长,砂浆导电能力越差;砂浆干燥状态下的电阻率比湿润状态增加了29%~199%,复掺不同导电填料或增加导电填料含量,都能降低含水量对电阻率的影响。
Multilayer graphene/steel fiber composite mortar was prepared.The resistivity of composite mortar was measured by four-electrode method.The influence of the testing time,MG and SF content,curing age and moisture content on the resistivity of composite mortar were studied.The micro-morphology of multi-layer graphene in mortar was observed by scanning electron microscopy.The results show that the polarization effect inside the mortar increases with the increase of conductive time,and the stronger the antioxidant property of conductive filler,the smaller the polarization effect.The permeability of mortar changes with the content of MG and SF.The relationship between the conductivity of single-doped MG and SF mortar and its content is fitted by GEM theory.Synergistic effect of multilayer graphene and steel fibers can increase the conductive chain and improve the conductive capacity,in which the resistivity of the composite SM is 21.7%-41.8% lower than that of the single MG.The longer the curing age,the worse the conductive capacity of the mortar.The resistivity of mortar in dry state increases by 29%-199% compared with that in wet state.Adding different conductive fillers or increasing the content of conductive fillers can reduce the influence of water content on the resistivity.
作者
韩瑞杰
程忠庆
高屹
张元豪
HAN Ruijie;CHENG Zhongqing;GAO Yi;ZHANG Yuanhao(Department of Coastal Defense Engineering,Naval College of Service,Tianjin 300450,China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第1期34-40,共7页
Bulletin of the Chinese Ceramic Society
