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

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.

[1]  Stavroula J. Pantazopoulou,et al.  REPAIR OF CORROSION-DAMAGED COLUMNS WITH FRP WRAPS , 2001 .

[2]  Nahit Kumbasar,et al.  Behavior of damaged and undamaged concrete strengthened by carbon fiber composite sheets , 2002 .

[3]  Nicholas J. Carino,et al.  Nondestructive Techniques to Investigate Corrosion Status in Concrete Structures , 1999 .

[4]  K. Lundgren,et al.  Corrosion influence on bond in reinforced concrete , 2004 .

[5]  Mark F. Green,et al.  COMPARISON OF CONFINEMENT MODELS FOR FIBER-REINFORCED POLYMER-WRAPPED CONCRETE , 2005 .

[6]  Sami H. Rizkalla,et al.  Confinement Model for Axially Loaded Concrete Confined by Circular Fiber-Reinforced Polymer Tubes , 2001 .

[7]  Omar Chaallal,et al.  Circular Columns Confined with FRP: Experimental versus Predictions of Models and Guidelines , 2006 .

[8]  Mark F. Green,et al.  Carbon Fiber-Reinforced Polymer Wraps for Corrosion Control and Rehabilitation of Reinforced Concrete Columns , 2002 .

[9]  Amir Mirmiran,et al.  Model of Concrete Confined by Fiber Composites , 1998 .

[10]  Stephanie L. Walkup,et al.  Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures (ACI 440.2R-02) , 2005 .

[11]  John B. Mander,et al.  Observed Stress‐Strain Behavior of Confined Concrete , 1988 .

[12]  N. J. Gardner,et al.  Triaxial Behavior of Concrete , 1969 .

[13]  M. R. Spoelstra,et al.  FRP-Confined Concrete Model , 2001 .

[14]  H. Toutanji.  STRESS-STRAIN CHARACTERISTICS OF CONCRETE COLUMNS EXTERNALLY CONFINED WITH ADVANCED FIBER COMPOSITE SHEETS , 1999 .

[15]  Mohamed H. Harajli.  Effect of Confinement Using Fiber-Reinforced Polymer or Fiber-Reinforced Concrete on Seismic Performance of Gravity Load-Designed Columns , 2004 .

[16]  James L Noland,et al.  Computer-Aided Structural Engineering (CASE) Project: Decision Logic Table Formulation of ACI (American Concrete Institute) 318-77 Building Code Requirements for Reinforced Concrete for Automated Constraint Processing. Volume 1. , 1986 .

[17]  Khaled Soudki,et al.  Effect of Fiber-Reinforced Polymer Wraps on Corrosion Activity and Concrete Cracking in Chloride-Contaminated Concrete Cylinders , 2006 .

[18]  V. Karbhari,et al.  COMPOSITE JACKETED CONCRETE UNDER UNIAXIAL COMPRESSION--VERIFICATION OF SIMPLE DESIGN EQUATIONS , 1997 .

[19]  Yan Xiao,et al.  Compressive Behavior of Concrete Confined by Carbon Fiber Composite Jackets , 2000 .