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A comparison study of constant current and square wave current in the bidirectional electromigration rehabilitation on chloride-contaminated concrete
Abstract The objective of this study is to reduce the hydrogen embrittlement risk of rebar caused by the continuous constant current (CC) in the bidirectional electromigration rehabilitation (BIEM). Three types of square wave current (SWC) were applied in the BIEM treatment on a Cl--contaminated concrete, in the saturated calcium hydroxide containing 1 mol/L triethylenetetramine (TETA). The sample experienced the BIEM with a constant current density of 3 A/m2 was chosen as the control sample with the same electricity consumption. After 4 cycles of treatment, the concentration profiles of Cl- and TETA were measured in the protective layer. The corrosion current densities of the rebar were analyzed by various electrochemical tests. The stress-strain curve of the rehabilitated rebar was tested, and its hydrogen embrittlement risk was estimated. The results suggested that the SWC more effectively removed Cl- and migrated TETA than the CC did, with the same electricity consumption and treatment duration. The rebar experienced the former BIEM exhibited a higher fracture energy ratio and a lower corrosion rate than the one experienced the latter treatment. In general, the SWC was more effective and lower hydrogen embrittlement risk than CC in the BIEM rehabilitation treatment.
Highlights SWC more effectively removed Cl- and immigrated TETA than CC did with the same electricity consumption and treatment duration. Fracture energy ratio and corrosion rate of the SWC-treated rebar were higher and lower than those of the CC-treated one. Hydrogen embrittlement of rebar can be reduced by using SCW instead of CC in the BIEM treatment.
A comparison study of constant current and square wave current in the bidirectional electromigration rehabilitation on chloride-contaminated concrete
Abstract The objective of this study is to reduce the hydrogen embrittlement risk of rebar caused by the continuous constant current (CC) in the bidirectional electromigration rehabilitation (BIEM). Three types of square wave current (SWC) were applied in the BIEM treatment on a Cl--contaminated concrete, in the saturated calcium hydroxide containing 1 mol/L triethylenetetramine (TETA). The sample experienced the BIEM with a constant current density of 3 A/m2 was chosen as the control sample with the same electricity consumption. After 4 cycles of treatment, the concentration profiles of Cl- and TETA were measured in the protective layer. The corrosion current densities of the rebar were analyzed by various electrochemical tests. The stress-strain curve of the rehabilitated rebar was tested, and its hydrogen embrittlement risk was estimated. The results suggested that the SWC more effectively removed Cl- and migrated TETA than the CC did, with the same electricity consumption and treatment duration. The rebar experienced the former BIEM exhibited a higher fracture energy ratio and a lower corrosion rate than the one experienced the latter treatment. In general, the SWC was more effective and lower hydrogen embrittlement risk than CC in the BIEM rehabilitation treatment.
Highlights SWC more effectively removed Cl- and immigrated TETA than CC did with the same electricity consumption and treatment duration. Fracture energy ratio and corrosion rate of the SWC-treated rebar were higher and lower than those of the CC-treated one. Hydrogen embrittlement of rebar can be reduced by using SCW instead of CC in the BIEM treatment.
A comparison study of constant current and square wave current in the bidirectional electromigration rehabilitation on chloride-contaminated concrete
Lu, Xiangyu (author) / Shi, Zhihang (author) / Zhu, Ruihu (author) / Feng, Xingguo (author)
2023-11-14
Article (Journal)
Electronic Resource
English
Bidirectional electromigration of a corrosion inhibitor in chloride contaminated concrete
| Online Contents | 2016
STUDY OF ELECTROCHEMICAL REHABILITATION OF CHLORIDE CONTAMINATED REINFORCED CONCRETE
| British Library Conference Proceedings | 2000