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Degradation of bond between steel bar and freeze-thaw concrete after electrochemical chloride extraction

Journal of Central South University 2010年第2期17卷 388-393页

作者：郭育霞贡金鑫 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

The effect of electrochemical chloride extraction （ECE） on bond strength between steel bar and freeze-thaw concrete contaminated by chloride was experimentally investigated for beam specimens with dimensions of 100 mm × 100 mm × 400 ram. During the experiment, 3% NaC1 （vs mass of cement, mass fraction） was mixed into concrete to simulate chloride contamination, and the specimens experienced 0, 25, 50, 75 freeze-thaw cycles before ECE. In the process of ECE, different current densities and durations were adopted. It is indicated that the bond strength between reinforcement and concrete decreases with the increase of freeze-thaw cycles; the more the current and the electric quantity of ECE are, the more the loss of bond strength is; and the largest loss is up to 58.7%. So, it is important to choose proper parameters of ECE for the reinforced concrete structures contaminated by chloride and subjected to freeze-thaw cycles.

关键词： concrete bond strength degradation electrochemical chloride extraction freeze-thaw cycles

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Change of electrochemical Property of Reinforced Concrete after electrochemical chloride extraction

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Journal of Wuhan University of Technology(Materials Science) 2007年第4期22卷 764-769页

作者：王新祥 Key Laboratory of Specially Functional Materials of the Ministry of Education South China University of Technology Guangdong Academy of Construction and Architecture Science Guangzhou 510500China

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

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A State-of-the-Art Review of electrochemical chloride extraction for Concrete Structures

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Open Journal of Civil Engineering 2023年第1期13卷 1-24页

作者： Thamara Tofeti Lima iBMB (Institute of Building Materials Concrete Constructions and Fire Safety) Division of Concrete Construction TU Braunschweig Braunschweig Germany

electrochemical chloride extraction is a promising technique for the rehabilitation of concrete structures under chloride induced corrosion. This study consists of an extensive literature review of this treatment including application cases. It is found that the rate of chlorides removed is affected by the total charge passed, whereas increasing charge in a range between 1500 to 2000 Ah/m2 increases the amount of chlorides removed and this can be more effective by increasing current density instead of duration of treatment. Bound chlorides are extracted during treatment and, water works better than Ca(OH)2 as an electrolyte, possibly due to modifications on the concrete pore structure. Moreover, ECE is not efficient in repassivate structures but is efficient in its purpose of removing chlorides if treatment setup is well planned, which justifies the need for better international standards on the topic.

关键词： chloride Induced Corrosion Corrosion Rehabilitation electrochemical chloride extraction electrochemical Rehabilitation Methods Steel Reinforced Concrete

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