Experimental study on compressive behavior of concrete-filled GFRP tubular stub columns after being subjected to acid corrosion

Abstract

This paper presents the results of axial compression tests of concrete-filled GFRP tubular (CFGT) stub columns after being subjected to acid corrosion. Fifty-four specimens subjected to acid corrosion and nine specimens untreated with acid solutions are axially tested. The main parameters considered in this study include the wall thickness of GFRP tube, concrete strength, PH value of acid solution, and immersion duration. CFGT stub columns after being subjected to acid corrosion are all failed with the fracturing of GFRP tube and crushing of core concrete. The ultimate strength of the CFGT stub columns corroded by acid solution decreases remarkably compared with those without acid corrosion. The longer the immersion duration, the lower the ultimate strength of the acid corroded CFGT stub columns. Immersion duration has the greatest influence on the percentage decrease of ultimate strength of the acid corroded CFGT stub columns, followed by the PH value of acid solution. However, the effects of the wall thickness of GFRP tube and concrete strength on the percentage decrease of ultimate strength can be neglected. Additionally, the finite element models are also developed for the acid corroded CFGT stub columns by the ABAQUS software and are verified with the experimental results.