Corrosion risk of steel fibre in concrete

被引：55

作者：

Hwang, Jun Pil ^{[1
]}

Jung, Min Sun ^{[1
]}

Kim, Moonil ^{[1
]}

Ann, Ki Yong ^{[1
]}

机构：

[1] Hanyang Univ, Dept Civil & Environm Engn, Ansan 426791, South Korea

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2015年 / 101卷

关键词：

Steel fibre; Corrosion; Chloride; Concrete; Porosity; RESISTANCE;

D O I：

10.1016/j.conbuildmat.2015.10.072

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In the present study, the corrosion risk of steel fibre in concrete was assessed by measuring the corrosion rate of steel fibre in chloride-contaminated mortar. Simultaheously, the rate of chloride transport in steel fibre mortar was determined by chloride profiles. Then, the interface of the steel fibre was examined by the scanning electron microscopy to ensure the porosity in the vicinity. As a result, it was found that the corrosion resistance of steel fibre against chloride was slightly higher than for reinforcing steel rebar in concrete, presumably due to the presence of mille scale on the surface; the chloride threshold level ranged 0.8-1.0% by weight of cement. However, transport of chloride ions in concrete containing steel fibre was accelerated by increased porosities in the vicinity of steel fibre, implying that external aggressive ions may easily penetrate the concrete then to chemically degrade concrete properties. In fact, the diffusion coefficient of chloride in mortar containing steel fibre ranged 4.79-9.61 x 10(-12) m(2)/s, as being 2-3 times higher for steel fibre-free mortar. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：239 / 245

页数：7

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