Rehabilitation of bridge and other infrastructures damaged by continuous wear, as well as timedependent and environmental effects, is a major concern. Every year, worldwide billions of dollars are spent to repair and maintain a large number of reinforced concrete (RC) bridges. Recent developments on ultra high performance concrete (UHPC) significantly made these materials feasible and convenient to use for repair of damaged and deficient piers. UHPC can protect the existing core pier against aggressive environmental agents and increase strength and durability of the piers as the confinement material. This paper presents an investigation on the performance of repaired damaged RC circular bridge piers using HPC jacketing technique. Jackets made of UHPC having different thicknesses with same reinforcement configuration were used to repair damaged RC core piers and analyze their behavior. Reinforced core piers were axially loaded to 60% of their ultimate load to induce damage before being repaired with HPC jackets. Jacketed pier specimens were tested to failure under concentric axial load applied through the core pier. Test results indicated performance enhancement of UHPC jacketed repaired piers in terms of improved ductility, energy absorbing capacity and strength recovery. The jacket confining effect and overall ductility characteristics of repaired piers were influenced by jacket thickness to core pier diameter ratio which needs to be optimized.