EXPERIMENTAL STUDY ON THE DURABILITY OF GFRP BARS EMBEDDED IN ACTUAL CONCRETE ENVIRONMENT

Abstract

Abstract: An experimental study on GFRP bars embedded in concrete environment was conducted to investigate their tensile strengths. The degradation mechanism of GFRP bars exposed to tap water and alkaline solution at different temperature was studied by analyzing the ultimate tensile strength, elastic modulus of the specimen. The results showed that after being exposed to tap water environment for 90 day at 20 and 40℃,tensile strength of GFRP bar decreased by 8.8%, 12.2%, respectively, but the retention can reach to 17.5%, 22.1%, respectively, in the alkaline solution at the same temperature. With the increase of exposure time, the decrease of tensile strength gradually slows down. Through comparing the specimens embedded in concrete environment with specimen directly immersed in alkaline solution, we can find out that the tensile strength degradation rate of GFRP bar under simulated alkaline solution is about 2.5~3 times of the actual concrete environment.

Key words: concrete environment, GFRP bar, tensile strength, alkaline environment

CLC Number:

TB332
TU528

DAI Li, HE Xiong-jun, YANG Wen-rui, HE You-wei. EXPERIMENTAL STUDY ON THE DURABILITY OF GFRP BARS EMBEDDED IN ACTUAL CONCRETE ENVIRONMENT[J]. COMPOSITES SCIENCE AND ENGINEERING, 2015, 0(8): 75-79.

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