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Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution

Mechanical properties of glass fiber reinforced polymer (GFRP) composites degrade under the combined effects of mechanical load and alkaline solution, affecting the service ability and safety of GFRP reinforced structures. In this study, GFRP bars were loaded with cyclic tension at different stress...

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Autores principales: Jin, Qingping, Chen, Peixia, Gao, Yonghong, Du, Aihua, Liu, Dongxu, Sun, Lizhi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7476013/
https://www.ncbi.nlm.nih.gov/pubmed/32796501
http://dx.doi.org/10.3390/ma13163533
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author Jin, Qingping
Chen, Peixia
Gao, Yonghong
Du, Aihua
Liu, Dongxu
Sun, Lizhi
author_facet Jin, Qingping
Chen, Peixia
Gao, Yonghong
Du, Aihua
Liu, Dongxu
Sun, Lizhi
author_sort Jin, Qingping
collection PubMed
description Mechanical properties of glass fiber reinforced polymer (GFRP) composites degrade under the combined effects of mechanical load and alkaline solution, affecting the service ability and safety of GFRP reinforced structures. In this study, GFRP bars were loaded with cyclic tension at different stress levels and immersed in alkaline solution for days to investigate the tensile properties and degradation law of GFRP bars. The degradation mechanisms were studied at micro-, meso- and macro-scales with scanning electron microscopy (SEM) and three-dimensional X-ray microscopy, respectively. The results show that tensile strength and degradation rate of GFRP bars are mainly dependent on the different stress levels and alkaline solution. When stress level is higher, the tensile strength degrades more quickly, especially in the early stages of soaking. With the loading and immersion time, the elastic modulus and Poisson’s ratio increase at first and then decrease. The ultimate tensile strain is relatively stable, whereas the ultimate elongation is significantly reduced. A strength-degradation model was proposed and fit well with experimental data, demonstrating that the model can be applied to predict tensile strength degradation under combined effects of the load and alkaline solution.
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spelling pubmed-74760132020-09-09 Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution Jin, Qingping Chen, Peixia Gao, Yonghong Du, Aihua Liu, Dongxu Sun, Lizhi Materials (Basel) Article Mechanical properties of glass fiber reinforced polymer (GFRP) composites degrade under the combined effects of mechanical load and alkaline solution, affecting the service ability and safety of GFRP reinforced structures. In this study, GFRP bars were loaded with cyclic tension at different stress levels and immersed in alkaline solution for days to investigate the tensile properties and degradation law of GFRP bars. The degradation mechanisms were studied at micro-, meso- and macro-scales with scanning electron microscopy (SEM) and three-dimensional X-ray microscopy, respectively. The results show that tensile strength and degradation rate of GFRP bars are mainly dependent on the different stress levels and alkaline solution. When stress level is higher, the tensile strength degrades more quickly, especially in the early stages of soaking. With the loading and immersion time, the elastic modulus and Poisson’s ratio increase at first and then decrease. The ultimate tensile strain is relatively stable, whereas the ultimate elongation is significantly reduced. A strength-degradation model was proposed and fit well with experimental data, demonstrating that the model can be applied to predict tensile strength degradation under combined effects of the load and alkaline solution. MDPI 2020-08-11 /pmc/articles/PMC7476013/ /pubmed/32796501 http://dx.doi.org/10.3390/ma13163533 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Jin, Qingping
Chen, Peixia
Gao, Yonghong
Du, Aihua
Liu, Dongxu
Sun, Lizhi
Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
title Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
title_full Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
title_fullStr Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
title_full_unstemmed Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
title_short Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
title_sort tensile strength and degradation of gfrp bars under combined effects of mechanical load and alkaline solution
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7476013/
https://www.ncbi.nlm.nih.gov/pubmed/32796501
http://dx.doi.org/10.3390/ma13163533
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