Network Level Bridge Deck Condition Assessment in Minnesota

In the period between 2009 and 2011, MnDOT carried out NDT scanning on 166 bridge decks throughout Districts 1, 3, 6, and Metro areas. Most of the work was carried out with ground penetrating radar (GPR), with infrared thermography (IR) used to a lesser extent in combination with the GPR. The purpose of this work was to determine the degree of unsound concrete in each deck so that appropriate maintenance and rehabilitation measures could be taken to maximize the benefit to users for a given budget. As part of this process, MnDOT commissioned an independent study to review cost, accuracy, and usefulness of these NDT methods with respect to their estimation of the actual extent of bridge deck repair. As part of this study, repair work on 12 of the bridge decks was evaluated. This evaluation included both chain drag areas obtained prior to construction and the footprint of the actual bridge deck repair area. The paper describes the GPR and IR methodology used in this project, the types of results obtained from these surveys, the method of gathering the chain drag and final repair quantities, and the comparison between the GPR/IR results and those obtained from chain drag and repair quantities.

References
1. ASTM D4788-03(2007) Standard Test Method for Detecting Delaminations in Bridge Decks Using Infrared Thermography, ASTM International, West Conshohocken, PA, 2007. 2. ASTM D6087-05, Test Method for Evaluating Asphalt-Covered Concrete Bridge Decks Using Ground Penetrating Radar, ASTM International, West Conshohocken, PA, 2005. 3. Barnes, Christopher L. and Jean-Francois Trottier. "Effectiveness of Ground Penetrating Radar in Predicting Deck Repair Quantities," ASCE.Journal of Infrastructure Systems 10.2 ” pp:69-76. 2004. 4. Carter, C.R., T. Chung, F.B. Holt and D. Manning. “An Automated Signal Processing System for the Signature Analysis of Radar Waveforms from Bridge Decks,” Canadian Electrical Engineering Journal, Vol. 11, No. 3, pp. 128-137. 1986. 5. Manning, D.G. and F.B. Holt. "Detecting Delaminations in Concrete Bridge Decks," Concrete International, November, pp. 34-41. 1980. 6. Maser, K.R. “New Technology for Bridge Deck Assessment,” Phase I and II Final Report prepared for the New England Transportation Consortium, Center for Transportation Studies, Massachusetts Institute of Technology, Cambridge, MA, 1990. 7. Maser, K.R., and W.M.K. Roddis. “Principles of Radar and Thermography for Bridge Deck Assessment,” ASCE Journal of Transportation Engineering, Vol. 116, No. 5, Sept/Oct 1990. 8. Maser, K., N. Martino, J. Doughty and R. Birken. "Understanding and Detecting Bridge Deck Deterioration using Ground Penetrating Radar," TRB 91st Annual Meeting, Paper 12-1765, January 2012. 9. Washer, G., N.K. Bolleni and R. Fenwick, “Thermographic Imaging of Subsurface Deterioration in Concrete Bridges,” Transportation Research Record: Journal of the Transportation Research Board, No. 2201 Washington, D.C., pp. 27-33. 2010.
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