Performance of Corrosion-Damaged RC Columns Repaired by CFRP Sheets

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Title: Performance of Corrosion-Damaged RC Columns Repaired by CFRP Sheets

Author(s): S.-W. Bae, A. Belarbi, and J.J. Myers

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 1447-1464

Keywords: axial compressive capacity; CFRP sheets; corrosion; RCcolumns; repair

Date: 10/1/2005

Abstract:
This study aimed to investigate the effectiveness of CFRP sheet in inhibitingthe corrosion process of steel reinforcement embedded in RC columns. A total of 30small-scale RC columns were conditioned under the accelerated corrosion process andthen tested under uni-axial compression up to failure. Some of the columns werestrengthened with CFRP sheets prior to the beginning of the accelerated corrosionprocess to simulate newly constructed RC columns wrapped with CFRP sheets. Theothers were strengthened with CFRP sheets after a certain period of the acceleratedcorrosion process to duplicate the corrosion-damaged RC columns to be repaired bywrapping with CFRP sheets. During the accelerated corrosion process, corrosion ratewas monitored. The test results showed that although CFRP sheet wrapping decreasedthe corrosion rate, the corrosion of steel reinforcement could continue to occur. Basedon the small-scale RC column tests, design guidelines were proposed and the proposeddesign guidelines were validated through test results of 4 mid-scale RC columns. Theproposed design guidelines introduced a concept of equivalent area to account for thecorrosion-damage such as internal cracking and cross-sectional loss of steelreinforcement.