Tensile Strength and Degradation of GFRP Bars under Combined Effects of Mechanical Load and Alkaline Solution
Open Access
- 11 August 2020
- Vol. 13 (16), 3533
- https://doi.org/10.3390/ma13163533
Abstract
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.Funding Information
- National Natural Science Foundation of China (51278391)
This publication has 20 references indexed in Scilit:
- Durability of GFRP bars in the simulated marine environment and concrete environment under sustained compressive stressConstruction and Building Materials, 2019
- Reliability Study on FRP Composites Exposed to Wet-Dry CyclesApplied Sciences, 2018
- Effect of the environment on the performance of GFRP reinforcing barsComposites Part B: Engineering, 2018
- Impact of the ambiance on GFRP composites and role of some inherent factors: A review reportJournal of Reinforced Plastics and Composites, 2018
- Mechanical properties of GFRP reinforcing bars at high temperaturesConstruction and Building Materials, 2018
- A review on FRP composites applications and durability concerns in the construction sectorJournal of Reinforced Plastics and Composites, 2013
- Tensile properties degradation of GFRP composites containing nanoclay in three different environmentsJournal of Composite Materials, 2011
- Tensile characterization of glass FRP barsComposites Part B: Engineering, 2005
- Durability and environmental degradation of glass‐vinylester compositesPolymer Composites, 2004
- Effect of Aging Environment on Degradation of Glass-Reinforced EpoxyJournal of Composites for Construction, 2002