S.KAVITHA 09J11 Guided by: DR.G.CHITRA

 The loss of stiffness caused by corrosion regained by FRP application  Confine concrete and improve the compressive strength  Decreased corrosion rates due to FRP application  Substantial increase in the ultimate strength

Types of FRP composite E-modulus (GPa)Ultimate strain Ultimate tensile strength(MPa) CFRP(laminate) CFRP(sheet) GFRP(sheet) AFRP(sheet)

STAGESPROCESS STAGE ICASTING OF BEAMS STAGE IIInducing cracks by flexural loading and ponding salt solution over high moment region and exposing it to moisture STAGE IIICONCRETE COVER DELAMINATION STAGE IVAPPLICATION OF FRP WRAP STAGE VTesting of flexural strength

No of beams 8 2 uncorroded control 4 fibre wrapped 2 corroded control

Splitting caused by damage Reinforcement before sandblasting Corrosion infliction

Process of inducing corrosion Cracks were induced by flexural loading Salt solution was then ponded over the high moment region Alternative wetting and drying carried out for 2-3 weeks Resulting in severe concrete cover delamination

CARBON FRP

Partial wrapFull wrap

 Resin or polymer - Holds the composite together and influences the physical properties of the end product  Reinforcement (Fibre) - Mechanical strength  Fillers and Additives – Process/performance aids to impart special properties to the end product

◦ Good Modulus At High Temperatures ◦ Excellent Stiffness ◦ Brittle ◦ Low Electric Insulating Properties ◦ Resistance to corrosion

Wet-lay up  Highly soluble resin is sprayed, poured, or brushed into a mold  Reinforcement is then wet out with resin and placed in the mold  The fibre is then rolled, brushed, or applied to remove entrapped air and to compact it against the mold surface

1)M. P. Kutarba, The Haskell CompanyJ. R. Brown, Hope CollegeH. R. Hamilton, University of Florida, “Repair of corrosion Damaged Concrete Beams with Carbon Fiber-Reinforced Polymer Composites “, Composites research journal- Fall2007 2) A. Leema Rose, K. Suguna and P.N.Ragunath,” Strengthening of corrosion damaged RC beams with GFRP laminates”, Journal of civil engineering Science Publications 3)Rajan Sen, Ph.D, P.E.,Gray Mullins, Ph.D, P.E, “Use of FRP in corrosion mitigation applications in marine environment”, ASCE – OCTOBER 2005,University of South Florida 4) Khaled A. Soudki, Ted Sherwood, and Sobhy Masoud “FRP Repair of Corrosion-Damaged Reinforced Concrete Beams”, Department of Civil Engineering University of Waterloo, Waterloo, Canada, vol1, ASCE- June 2008 REFERENCES