Abstract
The efficiency of external strengthening using CFRP (Carbon Fiber Reinforced Polymer) sheets to rehabilitate corrosion-defected RC (Reinforced Concrete) beam–column members is experimentally studied. ALL specimens were tested under a combined axial force and transverse load until failure. The axial forces were applied with two levels either 25% or 50% of the ultimate design load of control specimen. The accelerated corrosion process was used to get steel reinforcement corrosion inside the concrete at three levels, 0% and approximately 5% and 20%, according to Faraday’s law. External strengthening with a CFRP sheet was used in this study to overcome the effect of deterioration in the mechanical properties of the corroded steel bars. A significant deterioration in the load carrying capacity, stiffness, and serviceability was recorded for corrosion-defected specimens. The increase of the axial force was recorded as a positive effect on the ultimate strength, stiffness, and serviceability of the testing specimens. This effect was clearly evident for the defected specimens, with an increasing corrosion level, by decreasing the adverse effects of corrosion. The external strengthening with a CFRP sheet restored the load-carrying capacity, stiffness, and serviceability to an undamaged state.
Highlights
Structural rehabilitation has become an important technique that needs to be improved and enhanced to show efficiency with defected structural members
External strengthening with a Carbon Fiber Reinforced Polymer (CFRP) sheet was used to rehabilitate the deterioration of Reinforced Concrete (RC) beams
Results showed that a strengthening technique via CFRP sheets for corroded RC beams was capable of maintaining the load carrying capacity
Summary
Structural rehabilitation has become an important technique that needs to be improved and enhanced to show efficiency with defected structural members. Experimentally studied the behavior of the reinforced concrete ultrahigh toughness cementitious composite (RC/UHTCC) beam They indicated that corrosion clearly affected the load carrying capacity, deformation, ductility, and flexural crack patterns of the defected specimens. External strengthening with a Carbon Fiber Reinforced Polymer (CFRP) sheet was used to rehabilitate the deterioration of RC beams They found that using composite materials for a CFRP sheet to strengthen corroded RC beams is an efficient technique that can maintain the structural integrity and enhance the behavior of the damaged beams. Results showed that a strengthening technique via CFRP sheets for corroded RC beams was capable of maintaining the load carrying capacity In this way, the strength of the beams that were damaged due to corrosion was restored to the control state when they were strengthened with CFRP sheets. The study shows the effects of increasing axial force on the structural behavior and ultimate strength of defected and defected/rehabilitated specimens
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