Bond durability between anchored GFRP bar and seawater concrete under offshore environmental conditions

Abstract The lower bond strength of FRP bars to concrete compared steel has remained an unsolved barrier the widespread use FRP-reinforced under extreme loading. Additionally, degradation between reinforcement and concretes in aggressive environments adds existing concern. In this study, innovative anchorage system comprised polypropylene pipe was used strengthen seawater GFRP after 250 days exposure offshore environmental conditions. As material factors, two types (sand-coated ribbed) (normal concrete) were evaluated. Four distinct conditions assess samples: (i) ambient environment (control), (ii) tap water, (iii) seawater, (iv) wet-dry cycles seawater. According findings direct pull-out tests, suggested anchor strengthens shifts failure mode from bar rupture. cycles, GFRP-reinforced lost 5% its maximum (developed tensile stress). All other samples exposed different either increased or decreased by less than days, control samples.