ABSTRACT
Fiber Reinforced Polymer (FRP) materials have been mostly implemented for strengthening and repairing existing structures in the form of an externally bonded system, i.e., sheet, jacket, near surface mounted. Furthermore, they have been recently utilized as internal reinforcement of concrete elements in the form of strands, bars, tendons, etc. The higher durability and better performance associated with the FRP material compared to steel promises major improvement in the life cycle of concrete elements. Nevertheless, concerns remain regarding potential damages and defects in this material, many of which are related to their unique features. Hence, as it is the case for other materials, FRP reinforced/strengthened concrete (FRP-RSC) elements need to be inspected regularly to allow effective maintenance during their service life. A recent study sponsored by the US Federal Highway Administration (FHWA) aims at addressing the absence of inspection guide and procedures for FRP-RSC elements. This study first determined all possible or potential damages and anomalies attributed to FRP-RSC elements. It then investigated inspection methods that can be applicable to the inspection of FRP-RSC. Finally, it provided a framework for in-service inspection of FRP-RSC elements applicable to buildings and bridges. The study recommended adding FRP as new material to the AASHTO Manual for Bridge Element Inspection (MBEI) and developed accompanying inspection aids and condition states for inclusion. It also proposed condition rating tables and examples for inclusion in the FHWA Specification for National Bridge Inventory (SNBI) as well as guidance for load rating of structures with FRP-RSC bridge elements. By providing the inspection community with more clarity in the application of inspection methods to FRP and development of comprehensive inspection processes this study allows evaluation of the performance and condition assessment of FRP-RSC elements, therefore, drives the proliferation of FRP applications in concrete structures.
