Experimental research on influence of transverse crack on corrosion rate of rebar in concrete

被引：0

作者：

Ji, Yongsheng ^{[1
,2
]}

Zeng, Ping ^{[2
]}

Ma, Huirong ^{[2
]}

Zhang, Linglei ^{[2
]}

Zhao, Wen ^{[2
]}

机构：

[1] Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology

[2] School of Mechanics and Civil Engineering, China University of Mining and Technology

来源：

Xinan Jiaotong Daxue Xuebao/Journal of Southwest Jiaotong University | 2013年 / 48卷 / 01期

关键词：

Concrete; Corrosion rate; Macrocell corrosion; Microcell corrosion; Rebar; Transverse crack;

D O I：

10.3969/j.issn.0258-2724.2013.01.006

中图分类号：

学科分类号：

摘要：

In order to probe into the effects of transverse crack on the corrosion rate of rebars in concrete, microcell and macrocell corrosions of rebars were investigated experimentally on beam specimens with a transverse crack with different crack widths, and the effects of crack width and concrete surface coating on the corrosion rate of rebar were analyzed. The research results show that macrocell corrosion and microcell corrosion of rebar at a transverse crack coexist. Crack width has no influence on the macrocell corrosion current at the crack and its distribution, but this increases the area of active region of rebar to increase the microcell corrosion current. Oxygen and water needed to rebar corrosion reaction go into concrete directly through the crack rather than through the uncracked concrete cover. To supply an epoxy coating or to enhance the thickness of the cover and the density of concrete can not prevent the corrosion of rebars at cracks.

引用

页码：36 / 41+61

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