Fatigue Flexural Behavior of Corroded Reinforced Concrete Beams Repaired with CFRP Sheets

This study investigated the flexural behavior of corroded steel reinforced concrete beams repaired with carbon-fiber-reinforced polymer (CFRP) sheets under repeated loading. Thirty beams ( 152×254×2,000 mm ) were constructed and tested. Fatigue flexural failure occurred in 29 of these beams. The study showed that pitting of the steel reinforcement due to corrosion occurred only after about a 7% actual mass loss which coincided with a decrease in the fatigue performance of the beam. The controlling factor for the fatigue strength of the beams is the fatigue strength of the steel bars. Repairing with CFRP sheets increased the fatigue capacity of the beams with corroded steel reinforcement beyond that of the control unrepaired beams with uncorroded steel reinforcement. Beams repaired with CFRP at a medium corrosion level and then further corroded to a high corrosion level before testing had a comparable fatigue performance to those that were repaired and tested after corroding directly to a high corrosion level.

[1]  H. Roper,et al.  Fatigue of Reinforced Concrete Beams in Air, Chloride Solution, and Sea Water , 1982 .

[2]  K. Soudki,et al.  Carbon-Fiber-Reinforced Polymer Repair to Extend Service Life of Corroded Reinforced Concrete Beams , 2005 .

[3]  M. Shahawy,et al.  Static and Fatigue Performance of RC Beams Strengthened with CFRP Laminates , 1999 .

[4]  Khaled Soudki,et al.  BEHAVIOUR OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH CARBON FIBRE REINFORCED POLYMER LAMINATES SUBJECTED TO CORROSION DAMAGE , 2000 .

[5]  J M Hanson,et al.  CONSIDERATIONS FOR DESIGN OF CONCRETE STRUCTURES SUBJECTED TO FATIGUE LOADING , 1974 .

[6]  Michael D. A. Thomas,et al.  Accelerated corrosion and repair of reinforced concrete columns using carbon fibre reinforced polymer sheets , 2000 .

[7]  Stavroula J. Pantazopoulou,et al.  Experimental evaluation of FRP jackets in upgrading RC corroded columns with substandard detailing , 2004 .

[8]  T. Topper,et al.  Performance Evaluation of Carbon Fiber-Reinforced Polymer- Repaired Beams Under Corrosive Environmental Conditions , 2007 .

[9]  M. A. Erki,et al.  Fatigue Behavior of Reinforced Concrete Beams Strengthened with Carbon Fiber Reinforced Plastic Laminates , 2004 .

[10]  K. N. Smith.  A Stress-Strain Function for the Fatigue of Metals , 1970 .

[11]  J L Smith,et al.  Materials and Methods for Corrosion Control of Reinforced and Prestressed Concrete Structures in New Construction , 2000 .

[12]  George J. Verbeck.  Mechanisms of Corrosion of Steel in Concrete , 1975 .

[13]  Tim Topper,et al.  CFRP-STRENGTHENED AND CORRODED RC BEAMS UNDER MONOTONIC AND FATIGUE LOADS , 2001 .

[14]  M. Maalej,et al.  BEHAVIORAL TRENDS OF RC BEAMS STRENGTHENED WITH EXTERNALLY BONDED FRP , 2001 .

[15]  Khaled Soudki,et al.  Effectiveness of Impressed Current Technique to Simulate Corrosion of Steel Reinforcement in Concrete , 2003 .

[16]  F. Lawrence,et al.  CORROSION FATIGUE OF AN HSLA STEEL , 1992 .

[17]  K. K. Ang,et al.  Effects of repeated loading on creep deflection of reinforced concrete beams , 1997 .

[18]  T. Topper,et al.  Postrepair Fatigue Performance of FRP-Repaired Corroded RC Beams: Experimental and Analytical Investigation , 2005 .