Effects of Corrosion of Steel Reinforcement on RC Columns Wrapped wtih FRP Sheets

by Sang-Wook Bae, Postdoctoral Fellow; Dept. of civ., Arch., and Envir. Engrg., Mmissouri Univ. of Sci. and Technol., 1870 Miner Circle, Rolla, MO 65409,
Abdeldjelil Belarbi, (corresponding author), P.E., (F.ASCE), Distinguished Prof.; Dept. of Civ., Arch., and Envir. Engrg., Missouri Univ. of Sci. and Technol., 1870 Miner Circle, Rolla, MO 65409, belarbi@mst.edu,

Serial Information: Issue 1, Pg. 20-31

Document Type: Journal Paper

Abstract: This study investigated the effectiveness of carbon fiber-reinforced polymer (CFRP) sheets in protecting reinforced concrete (RC) columns from corrosion of steel reinforcement. Thirty small-scale RC columns and four midscale RC columns were used in this study. The small-scale columns were used for a comprehensive parametric study, whereas the midscale columns were used to evaluate design guidelines proposed based on the results of the small-scale column tests. The test columns were conditioned under an accelerated corrosion process and then tested under uniaxial compression up to failure. The test results showed that although CFRP sheet wrapping decreased the corrosion rate, the corrosion of steel reinforcement could continue to occur, eventually showing a decrease in ultimate axial compression capacity. Design guidelines were proposed based on the small-scale RC column tests and evaluated through a comparison with the test results of midscale RC columns. The proposed design guidelines introduced a concept of effective area to account for the corrosion damage, such as internal cracking and cross-sectional loss of steel reinforcement.

Subject Headings: Concrete columns | Reinforced concrete | Steel columns | Fiber reinforced polymer | Corrosion | Reinforcing steel | Sheets | Compression tests | Carbon fibers |

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