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Advances in Materials Science and Engineering
Volume 2017, Article ID 3968578, 11 pages
https://doi.org/10.1155/2017/3968578
Research Article

The Effect of Crack Width on Chloride-Induced Corrosion of Steel in Concrete

College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China

Correspondence should be addressed to Weiqing Liu; nc.ude.hcetjn@uilqw

Received 22 March 2017; Accepted 15 June 2017; Published 19 July 2017

Academic Editor: Antonino Squillace

Copyright © 2017 Weiwei Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

When subjected to loading or thermal shrinkage, reinforced concrete structures usually behave in a cracking state, which raises the risk of bar corrosion from the working environment. The influence of cover cracking on chloride-induced corrosion was experimentally investigated through a 654-day laboratory test on cracked reinforced concrete specimens exposed to chloride solution. The concrete specimens have a dimension of 100 mm × 100 mm × 400 mm and a single prefabricated crack at the midspan. When the percentage concentration of chloride ion (0.6%, 1.2%, 2.1%, 3.0%, and 6.0%) and crack width (uncracked, 0.2, 0.3, 0.4, and 0.5 mm) are taken as variables, the experimental results showed that the corrosion rates for cracked specimens increased with increasing percentage concentration of chloride and increasing crack width. This study also showed the interrelationship between crack width and percentage concentration of chloride on the corrosion rate. In addition, an empirical model, incorporating the influence of the cover cracking and chloride concentration, was developed to predict the corrosion rate. This model allows the prediction of the maximum allowable based on the given percentage concentration of chloride in the exposure condition.