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Long-term effects of electrochemical realkalization on carbonated concrete

作     者:Peng ZHU Ji ZHANG Wenjun QU Peng ZHU;Ji ZHANG;Wenjun QU

作者机构:College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering StructuresShanghai 200092China 

出 版 物:《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿(英文版))

年 卷 期:2020年第14卷第1期

页      面:127-137页

核心收录:

学科分类:1305[艺术学-设计学(可授艺术学、工学学位)] 08[工学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0813[工学-建筑学] 0814[工学-土木工程] 

基  金:funded by the National Key Research and Development Program of China(No.2017YFC0703000) the National Natural Science Foundation of China(Grant No.51678430). 

主  题:realkalization concrete carbonation polarization curve corrosion 

摘      要:The long-term effects of electrochemical realkalization on carbonated reinforced concrete with a W/C ratio of 0.65 were studied.Fourteen out of 16 carbonated specimens had been subjected to realkalization seven years ago,and the alkalinity of the concrete,the electrochemical characters(corrosion current density and potential)of the specimens and the corrosion conditions of the steel bars were examined.Results of different specimens and also at different time(4,10,13 months and 7 years after realkalization)were compared.According to the phenolphthalein and pH meter test,the alkalinity of the concrete had disappeared after seven years.Based on the potentiodynamic polarization test,various corrosion conditions had developed on the steel bars,which was verified by visual observation.All bars were in the depassivated state,and their corrosion current densities increased significantly after seven years.Cracks developed in some of the specimens,and the diverse compactness of concrete and excessive current of realkalization were considered to be possible causes.The effects of the realkalization treatment vanished after seven years.

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