With the rising in reinforced concrete (RC) bridges that suffer from deterioration due to structural or maintenance reasons, the rehabilitation of these types of structures using composite material offers an excellent solution for the rehabilitation. In this paper, five case studies were investigated. The cases where bridges suffer from deterioration due to their life and virtually without any maintenance. These bridges are; The Little River Bridge Australia, The Tenthhill Creek Bridge Australia, The East Church Street Bridge United States, Wynantskill Creek Bridge United States, and the Rail Over Bridge of Karal junction India. The authority for each rehabilitation did a comparison between available methods of retrofitting and then the rehabilitation using composite Carbon Fiber Reinforced Polymer (CFRP) was the preferred solution for all three bridges. The Little River Bridge's flexural strengthening results showed that the CFRP composite system is an effective and feasible method for strengthening concrete beams. The Tenthill Bridge can be strengthened to provide more flexural and shear capacities by using CFRP laminate and CFRP wrapping. The East Church Street Bridge's retrofit methodology turned out to be a more affordable alternative to traditional maintenance techniques. Installation of the system was comparatively simple, and it barely affected traffic. These crucial characteristics make it appealing to bridge owners, particularly for comparable uses in densely populated urban regions. The Wynantskill Creek Bridge Strengthening Project used an FRP laminate system to show how cost-effective these technologies are in strengthening applications with little to no traffic disruption. The strengthening of the Rail Over Bridge demonstrated the many advantages of FRP materials, including their high strength, lightweight, and non-corrosive attributes. Additionally, installing these products is simpler, more affordable, and causes the least amount of traffic disturbance than traditional refurbishment methods. In general, the outcome of the strengthening restored the bridges to their original structural functionality and enhanced their carrying capacity.

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