Abstract
Bidirectional electromigration rehabilitation (BIEM) is a novel electrochemical rehabilitation method involving the injection of inhibitors into steel bar surface. The BIEM effect and hydrogen embrittlement (HE) risk depend on the electrochemical parameters (current density and duration) and operating condition (stress level and concrete cover thickness) of reinforced concrete structures. Experiments were performed in this study to investigate the relationships between the aforementioned factors. For a small current density group, a linear relationship was established between electric flux and chloride extraction. For a large current density group, the reasonable current density, stress level, and treatment time were obtained. Finally, the querying method of electrochemical parameters combined with treatment time and current density was proposed.
摘要
双向电迁移(BIEM)是一种新型的提升混凝土结构耐久性的电化学修复方法,可以实现除氯阻锈双重目的。但是,双向电迁移技术的修复效果和由此引起的钢筋氢脆风险取决于电化学参数的选择(电流密度和修复时间)和混凝土结构的服役条件(钢筋应力水平和混凝土保护层厚度)。本文通过系统的试验研究了上述因素间的关系:电流密度低于临界析氢电流密度时,无氢脆风险且电通量和除氯效果呈线性关系;当电流密度高于临界析氢电流密度时,电流密度、应力水平和修复时间的增加均会导致氢脆风险的增加。最后,本文建立了基于修复效果和氢脆风险控制的双向电迁移参数查询方法。
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Foundation item: Projects(51908496, 51878610, 51820105012, 51778577, 51638013) supported by the National Natural Science Foundation of China; Projects (LY18E080003, LQ19E080011, LQ19E080012, LQ20E080001) supported by the Natural Science Foundation of Zhejiang Province, China; Project(2018A610359) supported by the Natural Science Foundation of Ningbo, China
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Zhang, J., Mao, Jh., Jin, Wl. et al. Control of repair effect and hydrogen embrittlement risk by parameters optimization for BIEM. J. Cent. South Univ. 27, 2408–2423 (2020). https://doi.org/10.1007/s11771-020-4458-z
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DOI: https://doi.org/10.1007/s11771-020-4458-z
Key words
- electrochemical rehabilitation
- concrete durability
- chloride extraction
- hydrogen embrittlement
- electrochemical parameter