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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 3701740, 15 pages
https://doi.org/10.1155/2017/3701740
Research Article

Impact of Cyclic Loading on Chloride Diffusivity and Mechanical Performance of RC Beams under Seawater Corrosion

1School of Transportation Science and Engineering, Beihang University, Beijing 100191, China
2State Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

Correspondence should be addressed to Yinghua Ye

Received 24 March 2017; Accepted 19 June 2017; Published 10 August 2017

Academic Editor: Xiao-Yong Wang

Copyright © 2017 Sen Pang 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

An experimental study was conducted to investigate the impact of cyclic loading on the mechanical performance and chloride diffusivity of RC beams exposed to seawater wet-dry cycles. To induce initial damage to RC beam specimen, cyclic loading controlled by max load and cycles was applied. Then beam specimens underwent 240 wet-dry cycles of seawater. Results show that the chloride content increased as max load and cycle increased. The chloride content at steel surface increased approximatively linearly as average crack width increased. Moreover, the max load had more influence on chloride content at steel surface than cycle. The difference of average chloride diffusion coefficient between tension and compression concrete was little at uncracked position. Average chloride diffusion coefficient increased as crack width increased when crack width was less than 0.11 mm whereas the increasing tendency was weak when crack width exceeded 0.11 mm. The residual yield load and ultimate load of RC beams decreased as max load and cycle increased. Based on univariate analysis of variance, the max load had more adverse effect on yield load and ultimate load than cycle.