ABSTRACT
Abstract Tensile strength, creep behavior and fatigue property of three types of fiber reinforced plastic rods for concrete reinforcements are evaluated. Glass, aramid and carbon fiber are used as reinforcing materials for the rods. Creep behavior of FRP rods depends on the type of fiber used and the applied stress. Fatigue strength of FRP rods depends also on the type of fiber used, the amplitude, the mean stress and the number of fatigue cycles. Fatigue property of FRP rods can be expressed by these factors. At higher applied stress, fatigue strength can be explained by the creep failure. As the applied stress is in proportion to the failure time in logarithm, service life of FRP rods dominated by creep can be estimated by the relationship. Keywords: Aramid fiber, carbon fiber, creep behavior, fatigue property, fiber reinforced plastic rod, glass fiber, reinforcement
1 Introduction
Fiber reinforced plastic (FRP) rods prevent deterioration of concrete structures due to corrosion of reinforcement in concrete, i f FRP rods are used as reinforcing materials for concrete. As FRP rods are relatively new materials for concrete structures, physical and chemical properties of FRP rods should be evaluated. From previous researches, there are some problems about gripping systems for strength tests, scatter in test results and chemical resistance of FRP rods[1,2,3]. In the case that the FRP rods are used to actual structures, static and dynamic strength of FRP rods should be investigated.
