Flexural Performance of Concrete Beams Strengthened using Different Repair Techniques

University Transportation Centers Program2019PDFTech ReportNassif, HaniAbu-Obeidah, AdiNa, ChaekukOzbay, KaanGao, JingqinKhayat, Kamal H.Research on Concrete Applications for Sustainable Transportation (RE-CAST)Rutgers UniversityUnited States. Department of Transportation. Office of the Assistant Secretary for Research and TechnologyUnited States. Department of Transportation. University Transportation Centers (UTC) ProgramResearch on Concrete Applications for Sustainable Transportation (RE-CAST) (UTC)United StatesBeamsBridgesCrackingFailure analysisFerrocementFiber reinforced concreteFiber reinforced polymersFlexural strengthPrestressed concreteRepairingRetrofittingSpallingTendons (Materials)repairCFRPSelf-consolidating concretesteel fiberspolypropylene fibersferrocementSupplementary cementitious materialsStructural performanceLife cycle cost assessmentRECAST UTC #00042134-01-2DUSDOT: DTRT13-G-UTC45Final Report, Period: 05/01/2017 -05/01/2019With an aging infrastructure, the United States is faced with a wide variety of deterioration and lack of functionality for its bridges and highways. Economic factors do not always allow for a complete replacement of the structure which highlights the importance of the concrete rehabilitation technologies. Retrofitting existing structures using fiber reinforced laminates has shown to be effective and can increase the service life of the structure if applied properly. This study includes an experimental program of reinforced concrete beams retrofitted in flexure with fiber-reinforced ferrocement (FR-FC) and fiber-reinforced self-consolidating concrete (FR-SCC) laminates. The laminate acts as flexure reinforcement to the concrete structure element that suffered spalling and loss of concrete cover. In addition to FR-FC and FR-SCC, the use of unbonded tendons in prestressed concrete beams has been widely utilized in bridges, parking structures, and residential buildings for strengthening, rehabilitation or repair of such members. With the growth of live load and the increase of damaged concrete members, there is a need to develop and utilize new techniques for more efficient and improved designs in reinforced and prestressed concrete members. This research presents an experimental investigation to study the effect of the reinforcements, shear studs, depth of the concrete spalled and the fibers content in the carbon fiber reinforced polymer (CFRP) tendons, FR-FC and FR-SCC laminate on the cracking load, ultimate capacity, deflection and the failure mode of the tested beams.127