PERFORMANCE OF FIBER REINFORCED PLASTICS FOR CONCRETE REINFORCEMENT

摘要

For design of concrete structures, tensile strength and modulus of elasticity of fiber reinforced plastic rods (FRP rods) as reinforcements for concrete should be evaluated. Other properties of the FRP rods such as creep, fatigue and durability should also be investigated for management and maintenance of the concrete structures. In this study, creep and fatigue behavior, and durability, such as resistance for ultraviolet rays, sea water and alkali, of fibers and FRP rods were investigated. Failure time due to creep is decreased with an increase in applied stress. The applied stress is in proportion to sustained time in logarithm. Fatigue strength depends on the type of fiber used in FRP rods, amplitude, mean stress and number of fatigue cycles. Mean stress of FRP rods using glass fibers is in proportion to number of fatigue cycles in logarithm. Aramid fiber reinforced plastic rods are deteriorated by ultraviolet rays due to deterioration of aramid fibers used in the rods. Glass fiber reinforced plastic rods are deteriorated by alkali solution.