Bonding Behavior of Wet-Bonded GFRP-Concrete Interface

Abstract

AbstractAn experimental study was conducted to investigate the interfacial behavior between glass-fiber-reinforced polymer (GFRP) plate and cast-in-place (CIP) concrete placed against this plate—a method known as wet-bonding. The experimental program consisted of 33 single-shear specimens with various initial placement times of concrete, durations of concrete curing, and interface preparations. Control specimens using a conventional dry-bonded technique were also tested. A model was proposed that was able to predict the interfacial ultimate pullout load and local shear stress-slip relationship of a wet-bonded interface with reasonable accuracy. It is shown that (1) wet-bonded interfaces exhibit lower capacity and interfacial fracture energy than dry-bonded interfaces although the load to cause initiation of debonding is not significantly different; (2) the time of initial placement of the CIP concrete onto the wet, set, or cured resin significantly influences the ultimate pullout load and interfacial frac...