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.
Highlights
Decades of researches and practical applications have proved that the use of GFRP bars embedded in concrete has been an effective method to solve the reinforce corrosion in concrete structures [1,2,3,4,5,6,7,8]
The degeneration of GFRP bars tensile strength is a function of the relevant time during long-term service process, which is mainly due to the presence of moisture or corrosion solution leading to corrosion of glass fiber as well as the corrosion rate increases with temperature increase [23]
GFRP bare bars GFRP bars embedded in concrete Fitting curve of GFRP bare bars Fitting curve of GFRP bars embedded in concrete under standard-curing system (20∘C) and steam-curing system (40∘C, 60∘C, and 80∘C) was reported to characterize the combined effects of curing temperatures and alkaline concrete on tensile properties of GFRP bars
Summary
Decades of researches and practical applications have proved that the use of GFRP bars embedded in concrete has been an effective method to solve the reinforce corrosion in concrete structures [1,2,3,4,5,6,7,8]. A number of investigations have been conducted to evaluate the effects of temperature, moisture, chemical erosion, loading, and different harsh environments on the properties of GFRP bars. These studies indicated that the influence of GFRP bars in alkaline environment was more obvious especially under the same load. He et al [6,7,8] explored the long-term tensile strength and flexural behavior of GFRP bars embedded in concrete beams with initial cracks. The durability of GFRP bars will be significantly affected under high temperature and humidity [9, 10]
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