Change of Electrochemical Property of Reinforced Concrete after Electrochemical Chloride Extraction  

作　　者：王新祥 

机构地区：[1]Key Laboratory of Specially Functional Materials of the Ministry of Education,South China University of Technology [2]Guangdong Academy of Construction and Architecture Science,Guangzhou 510500,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2007年第4期764-769,共6页武汉理工大学学报（材料科学英文版）

基　　金：the National Natural Science Foundation of China(No.50602016);the Science and Technology Promotion Project of Guangdong Province(No.2005B3280100);Research Fund of Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology of Ministry of Education(No.200500A);Silicate Material Engineering of Ministry of Education(No.SYSJJ2006-07)

摘　　要：The half cell potential （HCP） and corrosion current of reinforced concrete specimens doped with sodium chloride were determined after electrochemical chloride extraction （ECE）. The experimental results show that when ECE treatment is removed, HCP becomes more negative and corrosion current becomes larger in comparison to those before ECE treatment, then HCP shifts positively and corrosion current decreases with time. After 30 days ECE treatment, the HCP of cored specimens turn to about -100 mV due to the existence of sufficient oxygen around the exposed steel bars, but for un-cored specimens, longer time, about two months, is to be taken. The non-homogeneous HCP distribution at different layers of the same specimen after ECE treatment might induce secondary corrosion of steels.The half cell potential （HCP） and corrosion current of reinforced concrete specimens doped with sodium chloride were determined after electrochemical chloride extraction （ECE）. The experimental results show that when ECE treatment is removed, HCP becomes more negative and corrosion current becomes larger in comparison to those before ECE treatment, then HCP shifts positively and corrosion current decreases with time. After 30 days ECE treatment, the HCP of cored specimens turn to about -100 mV due to the existence of sufficient oxygen around the exposed steel bars, but for un-cored specimens, longer time, about two months, is to be taken. The non-homogeneous HCP distribution at different layers of the same specimen after ECE treatment might induce secondary corrosion of steels.

关 键 词：reinforced concrete CORROSION electrochemical chloride extraction half-cell potential corrosion current 

分 类 号：TU528[建筑科学—建筑技术科学]