外加电流阴极保护对碳纤维织物增强海水海砂水泥基复合材料板导电性能的影响机制  

Influence mechanism of impressed current cathodic protection on the conductivity properties of carbon fabric reinforced seawater sea-sand cementitious matrix composite plates

作　　者：洪嘉鑫 张大伟[1] 陶冶王之 刘嘉荣 HONG Jiaxin;ZHANG Dawei;TAO Yewangzhi;LIU Jiarong(Institute of Structural Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学结构工程研究所,杭州310058

出　　处：《复合材料学报》2025年第3期1502-1513,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金委面上项目(52078454)。

摘　　要：碳纤维织物增强水泥基复合材料(CFRCM)因兼具外加电流阴极保护(ICCP)、结构加固修复(SS)和结构健康监测(SHM)的多功能特性而受到关注,但目前ICCP对海水海砂CFRCM板导电性能的影响机制研究还很不足。本研究通过普通砂浆和海水海砂砂浆制备的CFRCM板开展模拟ICCP试验,探究了ICCP作用对CFRCM导电性能的影响规律和作用机制。结果表明:CFRCM的电阻随电量密度的增大先线性增长而后快速增长,海水海砂砂浆CFRCM进入快速增长阶段所需的电量密度约为13×10^(5)~15×10^(5)C/m^(2),大于普通砂浆CFRCM所需的6×10^(5)~8×10^(5)C/m^(2);材料的不均匀性使CFRCM存在导电性能劣化薄弱点,并将影响整体电阻变化;海水海砂环境对于减缓ICCP对碳纤维材料性能的劣化有积极的作用。同时基于试验结果和通电参数,建立了ICCP下CFRCM的电阻预测模型,计算得到海水海砂砂浆CFRCM经ICCP通电后服役期间内能够承受的最大电量密度为23.21×10^(5)C/m^(2),高于普通砂浆CFRCM的17.21×10^(5)C/m^(2),表明含氯环境可以有效延长CFRCM的电学使用寿命。本研究为推动兼具多功能特性的CFRCM的应用打下基础,同时有助于促进海水海砂资源化利用。Carbon fabric reinforced cementitious matrix(CFRCM)has attracted attention due to its multifunctional properties of impressed current cathodic protection(ICCP),structural strengthening(SS),and structural health monitoring(SHM).However,the current research on the influence mechanism of ICCP on the conductivity properties of seawater sea-sand CFRCM plates is still insufficient.This study conducted simulated ICCP tests on CFRCM plates prepared from normal mortar and seawater sea-sand mortar to investigate the influence and mechanism of conductivity properties of CFRCM under ICCP.The results indicate that the resistance of CFRCM initially shows a linear increase followed by rapid growth with the increase in charge density,and the charge density required for seawater sea-sand mortar CFRCM to enter the rapid growth stage is about 13×10^(5)-15×10^(5)C/m^(2),which is greater than the 6×10^(5)-8×10^(5)C/m^(2)required for normal mortar CFRCM;the in-homogeneity of the material causes CFRCM to have weak points in the conductivity properties degradation,which will affect the overall resistance change;the seawater sea-sand environment has a positive effect on mitigating the degradation of carbon fiber material properties caused by ICCP.Meanwhile,based on experimental results and electrification parameters,resistance prediction models for CFRCM under ICCP were established.The maximum charge density that seawater sea-sand mortar CFRCM can withstand during service after ICCP electrification was calculated to be 23.21×10^(5)C/m^(2),which is higher than the 17.21×10^(5)C/m^(2)of normal mortar CFRCM,indicating that the chloride-containing environment can effectively prolong the electrical service life of CFRCM.This study lays the foundation for promoting the application of CFRCM with multifunctional properties and simultaneously contributes to the resource utilization of seawater seasand.

关 键 词：CFRCM ICCP-SS 海水海砂 导电性能 预测模型 

分 类 号：TU599[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]