Experimental study on bond performance of GFRP bars in self-compacting steel fiber reinforced concrete

摘要

Reinforcing bars made of Glass-Fiber-Reinforced Polymers (GFRP) are more and more common asinternal reinforcement of concrete structures and infrastructures. Since the design of GFRP reinforced concretemembers is often controlled by serviceability limit state criteria (i.e., deflection or crack width control), anaccurate knowledge of the GFRP-concrete bond behavior is needed to formulate sound design equations.Furthermore, bond laws currently available and widely accepted for conventional steel rebars cannot bestraightforwardly applied for GFRP ones. Hence, an experimental program consisting of 36 pullout bending testswas carried out to evaluate the bond performance between GFRP bars and steel fiber reinforced self-compactingconcrete (SFRSCC) by analyzing the influence of the following parameters: GFRP bar diameter, surfacecharacteristics of the GFRP bars, bond length, and SFRSCC cover thickness. Based on the results obtained inthis study, pullout failure was occurred for almost all the specimens. SFRSCC cover thickness and bond lengthplaid important role on the ultimate value of bond stress of GFRP bars. Moreover, the GFRP bars with ribbedand sand-coated surface treatment showed different interfacial bond behaviors.