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Open AccessArticle

Prediction of the Long-Term Performance and Durability of GFRP Bars under the Combined Effect of a Sustained Load and Severe Environments

by Jianwei Tu 1,2, Hua Xie 2,3 and Kui Gao 2,*
1
State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, 430070 Wuhan, China
2
Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, 430070 Wuhan, China
3
General Constraction Company, China Construction Third Engineering Bureau Co., Ltd., 430070 Wuhan, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2341; https://doi.org/10.3390/ma13102341
Received: 22 April 2020 / Revised: 11 May 2020 / Accepted: 12 May 2020 / Published: 19 May 2020
(This article belongs to the Section Construction and Building Materials)
With the continuous development of production technology, the performance of glass-fiber-reinforced polymer (GFRP) bars is also changing, and some design codes are no longer applicable to new materials based on previous research results. In this study, a series of durability tests were carried out on a new generation of GFRP bars in laboratory-simulated seawater and a concrete environment under different temperatures and sustained loads. The durability performance of GFRP bars was investigated by analysing the residual tensile properties. The degradation mechanism of GFRP bars was also analysed by scanning electronic microscopy (SEM). Furthermore, the long-term performance of GFRP bars exposed to concrete pore solution under different stress levels was predicted using Arrhenius theory. The research results show that the degradation rate of GFRP bars was increased significantly at a 40% stress level. By comparing the test results, design limits, and other scholars’ research results, it is demonstrated that the GFRP bars used in this test have a good durability performance. It is found that the main degradation mechanism of the GFRP bars is the debonding at the fiber-matrix interface. In the range test, the effects of a 20% stress level on the degradation of GFRP bars were not obvious. However, the long-term performance prediction results show that when the exposure time was long enough, the degradation processes were accelerated by a 20% stress level. View Full-Text
Keywords: GFRP bars; durability; stress level; degradation; long-term performance prediction GFRP bars; durability; stress level; degradation; long-term performance prediction
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Tu, J.; Xie, H.; Gao, K. Prediction of the Long-Term Performance and Durability of GFRP Bars under the Combined Effect of a Sustained Load and Severe Environments. Materials 2020, 13, 2341.

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