ABSTRACT
Abstract In this study, bond creep behavior of two kinds of FRP rebars embedded in concrete were experimentally investigated by conducting pull-out creep test using concrete cube specimens and measuring the increase of the free end slip up to 8000 hours. The degree of the effect of the bond creep of the FRP rebars used as longitudinal reinforcement on long term deflection of reinforced concrete beams subjected to flexure were also discussed comparing with that of a deformed mild steel bar. Keywords: FRP rebar, pull-out test, bond, bond creep, flexural creep, long term deflection
1 Introduction
FRP rebars used as reinforcement for concrete structures usually include thermosetting resins as binders which are expected to transfer stress in the fibers one another and to prevent the fibers from erosion. In order to give enough bond strength, such modifications as fiber winding, twisting, braiding and/or pasting sand on surface etc. are applied to FRP rebars. Many experimental studies have been conducted for FRP rebars of various surface configuration on their bond properties in concrete. The results have shown the successful achievement of pull-out strength, development length and transfer length for pretensioned members using the treatments[l][2].
