Laboratory studies on influence of transverse cracking on chloride induced corrosion rate in concrete

被引：56

作者：

Ji, Yongsheng ^{[1
,2
]}

Hu, Yijie ^{[2
]}

Zhang, Linglei ^{[2
]}

Bao, Zhongzheng ^{[2
]}

机构：

[1] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Peoples R China

[2] China Univ Min & Technol, Jiangsu Key Lab Environm Impact & Struct Safety E, Xuzhou 221008, Jiangsu, Peoples R China

来源：

CEMENT & CONCRETE COMPOSITES | 2016年 / 69卷

基金：

美国国家科学基金会;

关键词：

Concrete; Transverse crack; Rebar; Corrosion rate; Macrocell; Microcell; REINFORCED-CONCRETE; STEEL CORROSION; GUARD RING; WIDTH; ENVIRONMENTS; RESISTIVITY; MACROCELL;

D O I：

10.1016/j.cemconcomp.2015.12.006

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

To clarify the corrosion mechanism of steel induced by transverse crack, a study on the influence of crack widths and epoxy coating on corrosion of steel bars in cracked concrete is presented here. Microcell and macrocell corrosions of bars were investigated on single crack specimens with crack widths of 0.08, 0.26, 0.38 and 0.94 mm. The entire study was carried out in an artificially created chloride ion-induced corrosion environment. The results show that the steel in cracks was activated once the transverse crack occurred on concrete element, and the macrocell corrosion must co-exist with microcell corrosion of reinforcements in test specimens with transverse crack. The macrocell current of steel elements were separated from the crack width, and the wider the transverse crack is, the higher corroded area and the greater microcell current of the rebar is. Oxygen and water go into concrete through crack instead of through concrete cover. The epoxy coating cannot prevent the occurrence and propagation of crack, so it was not effective to prevent corrosion of steel bars in cracked concrete. (C) 2016 Published by Elsevier Ltd.

引用

页码：28 / 37

页数：10

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