Abstract
In order to study the degradation of bonding performance between GFRP bars and concrete under erosive solutions, 36 drawn specimens were prepared from 3 different diameter GFRP bars for solution immersion test. The test used three kinds of erosion environments of water, salt and alkali solutions. After immersion for 270 days, the specimen was subjected to static tensile test. The test results show that the bond strength of GFRP bars and concrete decreases greatly in the salt environment. The bond strength of specimens decreased by an average of 24.01% in the salt solution, by 19.35% in the clear water solution, and by 17.36% in the alkaline solution.Based on elastic mechanics, the theoretical calculation formula of bond strength is proposed using the thick-walled cylinder model. The theoretical value agrees well with the measured value and has good applicability, which can provide a certain reference for engineering design.
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