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International Journal of Polymer Science
Volume 2017 (2017), Article ID 4262703, 8 pages
https://doi.org/10.1155/2017/4262703
Research Article

Combined Effects of Curing Temperatures and Alkaline Concrete on Tensile Properties of GFRP Bars

1School of Transportation, Wuhan University of Technology, Wuhan 430063, China
2Department of Road and Material, Jiangxi Transportation Institute, Nanchang 330025, China

Correspondence should be addressed to Xiong-jun He; moc.361@tuhwjxh

Received 13 October 2016; Revised 29 November 2016; Accepted 20 December 2016; Published 19 January 2017

Academic Editor: Ulrich Maschke

Copyright © 2017 Wen-rui Yang 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 significant number of studies have been conducted on the tensile properties of GFRP bars embedded in concrete under different environments. However, most of these studies have been experimentally based on the environmental immersion test after standard-curing and the lack of influence on the tensile properties of GFRP bars embedded in concrete during the curing process of concrete. This paper presents the results of the microscopic structures through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and tensile properties of GFRP bars, which were employed to investigate the combined effects of curing temperatures and alkaline concrete on tensile properties of GFRP bars. The results showed that the higher curing temperature aggravated the influence of the alkaline concrete environment on GFRP bars but did not change the mechanisms of mechanical degradation of the GFRP bars. The influence of different curing temperatures on the tensile strength of GFRP bars was different between the bare bar and bars in concrete. Finally, the exponential correlation equation of two different test methods was established, and the attenuation ratio of the tensile strength of GFRP bars embedded in concrete under different curing temperatures was predicted by the bare test.