Post-Repair Performance of Corroded Bond Critical RC Beams Repaired with CFRP

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Title: Post-Repair Performance of Corroded Bond Critical RC Beams Repaired with CFRP

Author(s): B.C. Craig and K.A. Soudki

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 563-578

Keywords: bond; CFRP; confinement; corrosion; repair

Date: 10/1/2005

Abstract:
Presented in this paper is an investigation on the ability of externally appliedfiber reinforced polymer (FRP) laminates to maintain bond of steel reinforcement inconcrete members subjected to corrosion. Specimens were transversely confined withCFRP laminates in the bond zone after being subjected to various degrees of corrosionranging from 2 to 10% theoretical mass loss. Some specimens were further corrodedafter repair to assess the effects of further structural deterioration. Control beams weresubjected to minor amounts of corrosion and tested to failure without repair. Testresults showed that CFRP wrapping was able to confine the corrosion cracking resultingin an overall flexural failure for all repaired specimens unlike the brittle bond splittingfailures of the control specimens. CFRP confinement proved less effective at higherlevels of pre-repair corrosion. Initial amounts of post-repair corrosion enhanced theperformance of the CFRP repair by increasing the confining pressure; however theconcrete rapidly deteriorated as the corrosion increased. In general, CFRP confinementwas found to provide superior bond performance with respect to the unrepairedmembers indicating the potential future use in field applications of bond repair.