Bridge Inspection Practices Using Nondestructive Testing Methods for Concrete Structure

Nondestructive testing (NDT) methods have been developed and employed as a means of rapid and effective structural inspection. Despite the various kinds of NDT methods developed for bridge inspection, not much study has been performed on their usage and effectiveness at a practical level. This paper presents an evaluation of NDT methods to identify how they are implemented in state agencies in the United States. The findings and analysis presented are based on the results obtained from a survey questionnaire targeted at Departments of Transportation (DOTs) in all U.S. states and territories. The survey questionnaire was initiated to clarify multiple issues regarding NDT implementation, such as identifying the types of inspection that involve NDT methods, effective methods of inspecting concrete structures, and so on. A total of 40 state agencies participated in the survey processing, and the major findings obtained from the states are explained in detail in this paper.