In many instances concrete structures need to be either repaired because of degradation or strengthened for upgrading. There is a variety of available repair methods involving techniques for restoring the initial load bearing capacity such as different types of injections and patching and strengthening techniques which aim at increasing the load bearing capacity and the stiffness of the structural members, among which jacketing by means of cast in place concrete, shotcrete and placement of external steel glued plates or epoxy bonded FRPs.