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Advances in Materials Science and Engineering
Volume 2018, Article ID 5835421, 12 pages
https://doi.org/10.1155/2018/5835421
Research Article

Fatigue Performance of SFPSC under Hot-Wet Environments and Cyclic Bending Loads

1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
2State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China

Correspondence should be addressed to Peiyan Huang; nc.ude.tucs@gnauhyp

Received 15 December 2017; Accepted 9 January 2018; Published 7 March 2018

Academic Editor: Antonio Gilson Barbosa de Lima

Copyright © 2018 Shanshan Luo 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

A new structural material named “steel fiber polymer structural concrete (SFPSC)” with features of both high strength and high toughness was developed by this research group and applied to the bridge superstructures in the hot-wet environments. In order to investigate the fatigue performance and durability of SFPSC under hot-wet environments, the environment and fatigue load uncoupling method and the coupling action of environment and fatigue load were used or developed. Three-point bending fatigue experiments with uncoupling action of environments and cyclic loads were carried out for SFPSC specimens which were pretreated under hot-wet environments, and the experiments with the coupling action of environments and cyclic loads for SFPSC specimens were carried out under hot-wet environments. Then, the effects of hot-wet environments and the experimental methods on the fatigue mechanism of SFPSC material were discussed, and the environmental fatigue equations of SFPSC material under coupling and uncoupling action of hot-wet environments and cyclic bending loads were established. The research results show that the fatigue limits of SFPSC under the coupling action of the environments and cyclic loads were lower about 15%. The proposed fatigue equations could be used to estimate the fatigue lives and fatigue limits of SFPSC material.