双向电迁移后混凝土内钢筋氢含量变化及影响

doi:10.11896/cldb.18120112

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Abstract Bidirectional electromigration repair tests were carried out on concrete specimens under different electrification duration and current density, for the sake of digging out the effect of hydrogen evolution on steel bars in concrete during bidirectional electromigration repair process. Hydrogen permeation degree of steel bars was determined by quantitatively measurement of hydrogen content in steel bars. The mechanical properties of steel bars were studied by constant strain rate tensile test and scanning electron microscope observation on fracture. Electrochemical chloride extraction was also conducted for comparison. In light of the results, extending the electrification time and enlarging the current density would give rise to a series variations: the increase in hydrogen content of reinforcing bar in concrete, the reduction in plasticity of reinforcing bar, the size diminishing and depth decrease of fracture dimple of reinforcing bar, and the risk of hydrogen embrittlement increased. Compared with electroche-mical chloride extraction, bidirectional electromigration could effectively inhibit hydrogen penetration into steel bars and reduce the risk of hydrogen embrittlement of steel bars. Furthermore, the quantitative analysis indicated that there was a good correlation between the hydrogen content in steel bars and the plastic properties of steel bars. Specifically, every 1 μg/g increase in hydrogen content would bring about a 12.18% decrease in fracture energy ratio of steel bars and a 9.92% increase in hydrogen embrittlement sensitivity coefficient.

Key words： concrete durability bidirectional electromigration hydrogen content hydrogen embrittlement plasticity reduction

Published: 03 January 2020

CLC number:

TU511.3

About author:: Zhenkang Xie, male, born in July 1994, master of Architecture and Civil Engineering, Zhejiang University. His research direction is durability of concrete structures and electrochemical repair;Jianghong Mao, male, born in July 1985, Ph.D., associate professor. He received his Ph.D. in structu-ral engineering from Zhejiang University in 2012. The research work mainly includes the research and application of health monitoring technology for engineering structures, and the research and application of electrochemical repair technology for durability of concrete structures. More than 70 academic papers have been published in academic journals at home and abroad, and one monograph has been edited. Nine national invention patents have been authorized. One of the first prizes for scientific progress in Ningbo has been awarded for related research results.

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	XIE Zhenkang
	JIN Weiliang
	MAO Jianghong
	ZHANG Jun
	FAN Weijie
	XIA Jin

Cite this article:

XIE Zhenkang,JIN Weiliang,MAO Jianghong, et al. Variation and Impact of Hydrogen Content of Reinforcing Bars in Concrete Caused by Bidirectional Electromigration[J]. Materials Reports, 2020, 34(2): 2039-2045.

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http://www.mater-rep.com/EN/10.11896/cldb.18120112 OR http://www.mater-rep.com/EN/Y2020/V34/I2/2039

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