Bridge Deck Scanning for Condition Assessment and Delamination Detection

It is well known that corrosion of reinforcement leading to concrete deck delaminations is a major maintenance repair replacement cost for state DOT’s across the country. Accurate mapping of top and bottom delaminations is needed to guide repair replacement decisions. The inspection of concrete bridge decks typically includes a delamination survey (with chain dragging for acoustic sounding that detects top rebar delaminations only). Employing innovative scanning NDE systems can improve delamination mapping accuracy, reduce inspection time, and provide additional information regarding possible bottom delaminations, the internal concrete conditions. In addition, sophisticated NDE systems can be employed in instances in which traditional chain dragging techniques have not been effective, such as on asphalt overlain concrete bridge decks. A research project titled “Vehicle-Mounted Bridge Deck Scanner” funded by the NCHRP-IDEA program is summarized herein. This research project focused on the development of rapid inspection techniques by adapting well known NDE test methods into rolling scanning equipment. The equipment then allowed for rapid testing to provide: (1) top and bottom delamination mapping; (2) internal conditions deterioration mapping; and (3) thickness profiling. Since development of the system, multiple bridge decks of varying type and condition have been evaluated. Three case studies, in which, comparison ground-truth techniques (Sounding, Coring, GPR, etc.) were employed, are presented herein. The presented case studies include both concrete and asphalt covered bridge decks.

1. Tinkey, Y., L.D. Olson, P. Miller and J. Tanner. “Vehicle Mounted Bridge Deck Scanner,” Proceedings of Transportation Research Board, Washington, D.C., January 2011. 2. Algernon, D., B. Grafe, F. Mielentz, B. Kohler and F. Schubert. “Imaging of the elastic wave propagation in concrete using scanning techniques: application for impact-echo and ultrasonic echo methods,” J. of Nondestructive Evaluation, Vol. 27, No. 1-3, p 83-97. 2008. 3. Maser, Kenneth R. “Integration of Ground Penetrating Radar and Infrared Thermography for Bridge Deck Condition Evaluation,” NDTCE’09, Non-Destructive Testing in Civil Engineering, Nantes, France, June 30 – July 3, 2009. 4. Barnes, C., J.-F. Trottier and D. Forgeron. “Improved Concrete Bridge Deck Evaluation Using GPR by Accounting for Signal Depth-Amplitude Effects,” NDT & E International, Vol. 41, No. 6, September 2008. 5. Barnes, Christopher L. and Jean-François Trottier. “Effectiveness of Ground Penetrating Radar in Predicting Deck Repair Quantities,” ASCE Journal of Infrastructure Systems, Vol. 10, No. 2, June 2004. pp. 69-76.
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