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Advances in Civil Engineering
Volume 2018, Article ID 3789214, 6 pages
https://doi.org/10.1155/2018/3789214
Research Article

Modeling Chloride Diffusion Coefficient of Steel Fiber Reinforced Concrete under Bending Load

1School of Materials Science & Engineering, Southeast University, Nanjing 211189, China
2Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China
3College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China

Correspondence should be addressed to Qiannan Wang; moc.361@uesnqw

Received 13 August 2017; Accepted 20 December 2017; Published 4 April 2018

Academic Editor: Song Han

Copyright © 2018 Qiannan Wang 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

The chloride diffusion coefficient is the most important parameter when predicting chloride ingress in concrete. This paper proposed a model for calculating the chloride diffusion coefficient of steel fiber reinforced concrete (SFRC). Considering the concrete structures in service are usually subjected to external loads, the effect of bending load was discussed and expressed with a stress factor in the model. The chloride diffusion coefficient of cement paste was calculated with capillary porosity and then used to predict the chloride diffusion coefficient of SFRC. Some factors in the model were determined with experimental results. Chloride bulk diffusion tests were performed on SFRC and plain concrete (without fiber) specimens under bending load. SFRC showed slightly better chloride resistance for unstressed specimens. The compressive stress decreased the chloride diffusion coefficient of SFRC, while it caused no change in plain concrete. For the tensile zone, the chloride resistance of concrete was improved significantly by adding steel fibers. Overall, SFRC performed better chloride resistance, especially under bending load. The proposed model provides a simple approach for calculating the chloride diffusion coefficient of SFRC under bending load.