Polymer Versus Cementitious Matrix Composites for Retrofitting Reinforced Concrete Columns-A State-of-the-Art Review

Area of Science:

• Civil Engineering
• Materials Science

Background:

• Fiber-reinforced polymer (FRP) composites are widely used for reinforced concrete (RC) structure retrofitting due to beneficial properties.
• However, FRPs exhibit limitations such as temperature sensitivity, poor performance in moist environments, high costs, and reversibility issues.

Purpose of the Study:

• To comprehensively assess and compare Fiber-Reinforced Polymer (FRP) and Fiber-Reinforced Cementitious Matrix (FRCM) composites for retrofitting RC compression members.
• Identify knowledge gaps and propose future research directions for these retrofitting materials.

Main Methods:

• Literature review and analysis of existing studies on FRP and FRCM composites.
• Identification of materials used in various strengthening approaches for both composites.
• Outline of stress-strain characteristics under tensile load for FRP and FRCM materials.
• Exploration of implementation techniques for both FRP and FRCM composites.

Main Results:

• FRCM composites, utilizing an inorganic cementitious mortar and breathable textiles, present an alternative to FRPs.
• Comparison of FRP and FRCM composites for axial retrofitting of RC compression members under ambient and high-temperature conditions.

Conclusions:

• FRCM composites address several limitations associated with FRPs, including temperature sensitivity and moisture performance.
• Further research is needed to fully understand the potential and application of FRCM in structural retrofitting.