Rehabilitation and Strengthening of Concrete Structures Using Carbon Fiber Reinforced Polymer

摘要

This paper gives the presentation of the author's experience with the use of carbon fiberreinforced polymer (CFRP) to rehabilitate and strengthen existing and new concretestructures. The various methods of strengthening of structures are first described. Theseinclude the external post-tensioning using high tensile bars or strands, the reinforcedconcrete jacketing, and the reconstruction of structural members.The paper describes the advantages of CFRP in its high tensile strength of 100 ksiminimum, its constructability, and its environmental friendliness. The process does notrequire demolition or closure of bridges or buildings that are being strengthened, ascompared to some other methods. With good products and skills, the procedure ofstrengthening using CFRP wrap is simple and quick.The author presents his experience in evaluating and selecting an appropriate method forseveral cases under different conditions. These are the strengthening of existingreinforced concrete circular columns in existing bridges overseas and in the US , thestrengthening of rectangular concrete columns in new building, and of new posttensionedconcrete beams, both by concrete jacketing and CFRP wrapping. Suggestedprocedure for application of CFRP is given, and final precautionary notes are given in theconclusion.