The Tennessee Department of Transportation (TDOT) routinely inspects approximately 20,000 bridge structures. In many instances, the inspection process relies heavily on NDT/NDE methods to better understand the current condition of the structure. The study presented herein documents the inspection process and several aspects of NDT/NDE use in Tennessee's bridge inspection program. Challenges faced by the department are identified. Accessibility of the structures and need for NDT/NDE methods are also discussed for instances such as bridge decks where accessibility may be limited due to asphalt overlay (top) and concrete or steel stay-in-place deck forms (bottom). Challenges encountered with underwater inspections are also discussed as well as methods the department follows to mitigate these challenges. NDT/NDE inspection techniques that the department has investigated for determining the depth of unknown foundations are also discussed. Typical applications where the use of a third party testing agency is required are also discussed. Finally, the required minimum qualifications/training for each typical inspection team leader are discussed including the department's typical training program for inspection team members.
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