Abstract

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Title:: Experiment on Mechanical Properties Degradation of GFRP Bars in Eroded Environment

Author(s):: LU Chun-hua; HE Li-yuan; CHU Tian-shu; YAN Yong-dong; Faculty of Civil Engineering and Mechanics, Jiangsu University

Keywords:: GFRP bar; eroded environment; size effect; mechanical property; durability

Abstract:: In order to study the mechanical properties degradation mechanism of glass fiber reinforced polymer (GFRP) bars under eroded environment, three kinds of GFRP bars with different diameters were tested in solution immersion for six months. In the experiment, three kinds of eroded environments, such as clear water, alkali solution and salt solution, were used to test the appearance and mechanical properties of the reinforcement materials after soaking different time. The results show that in different eroded environment, the tensile strength of GFRP bars decreases mostly in alkaline environment, the average is 11.44%, in the salt environment, the average is 4.59%, in the water environment, the average is 4.30%, and the shear strenghs decrease 23.03%, 18.69%, 28.28% in water, salt and alkali environments respectively, which indicates that the eroded environment has a significant effect on mechanical properties. In the salt environment, the tensile strengths of 8, 12 and 16 mm specimens decrease by 3.53%, 9.42% and 0.82% respectively, which indicates that the mechanical properties of the samples have a certain size effect. The shear strength degradations of GFRP bars increase with the increase of immersion time, and decrease rapidly in previous 36 d and slowly after 36 d.