Effect of CNTs on the corrosion performance of reinforced concrete

被引：0

作者：

Li G. ^{[1
,2
]}

Wang Z. ^{[1
]}

机构：

[1] College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou

[2] Department of Civil Engineering, Shantou University, Shantou, 515063, Guangdong

来源：

Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2018年 / 46卷 / 03期

关键词：

Carbon nanotubes; Concrete; Corrosion performance; Electrochemical measurements; Mass loss;

D O I：

10.13245/j.hust.180319

中图分类号：

学科分类号：

摘要：

The research study presented herein evaluates the corrosion behavior of steel bar in concretes with different CNTs content (0.1%~0.5%), which were are exposed to 5% NaCl solution. The corrosion process was followed by monitoring of open-circuit current, micro-strain and mass loss of steel bar. Electrochemical measurements show that the addition of 0.1%~0.3% CNTs enhances the corrosion resistance of reinforced concrete exposed to NaCl solution, however the concrete with 0.5% CNTs shows a higher corrosion rates. According to the test results, the addition of 0.1~0.3% CNTs delays the cracking time of concrete cover by about 11%~32% over the unmodified concrete, while the addition of 0.5% CNTs accelerates the time by 27.8%. Moreover, the mass loss of steel rebar embedded in concrete containing 0.1%~0.3% CNTs is about 30%~81% lower than that of PCC. SEM results show that a lot of needle-like crystals and cracks can be observed in both PCC and CNTs modified concrete, however, the crack width of PCC was much larger than that of CNTs modified concrete. © 2018, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.

引用

页码：103 / 107

页数：4

共 11 条

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