Durability and serviceability performance of GFRP rebars as concrete reinforcement
  Aditya S. Rajput and Umesh K. Sharma
  Increasing demand of a corrosion free reinforcing material becomes the primary motivation for the use of “Fiber Reinforced Polymer (FRP)” rebars as an internal reinforcement in RC members. Excellent corrosion resistance, nonconductive and nonmagnetic nature, very high strength to weight ratio, etc. proves the high potential of FRP rebars as a reinforcing material. However, durability and serviceability of this new material are still least understood attributes. Previous research shows FRP possesses low immunity against the alkaline pore water of concrete, low modulus of elasticity and brittle nature which results in durability and serviceability problems. In this study, a detailed experimental program was planned with two prime motives of examining durability of Glass fiber reinforced polymer (GFRP) rebars in 6 different exposures (encompassing alkaline as well as real field exposures), and durability and serviceability of GFRP reinforced normal concrete beams in 3 different exposures. Outcome of the tests manifests significant degradation in tensile strength (up to 29.11%) of GFRP rebars when exposed to high pH (alkaline) solutions, though they show good durability against corrosive environment. Load v/s Deflection study and crack propagation plots of GFRP reinforced concrete beams show larger values of deflection and wider cracks as compared to their steel reinforced counterparts. Durability evaluation shows no significant degradation in flexural strength of GFRP reinforced beams exposed to corrosive exposure. Theoretical validation of experimental results shows good agreements with the analytical model provided by “Design Manual No.3, ISIS-Canada.”
 

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