Use of Ground Penetrating Radar (GPR) for Value Engineering Rehabilitation Redesign of New York State Thruway Bridge Decks

A 2014-2015 New York State Thruway Authority deck rehabilitation project on I-87 in Rockland County, NY utilized ground penetrating radar (GPR) to assess the condition of two asphalt overlaid concrete bridge decks carrying mainline traffic. The initial GPR results were calibrated using cores at 24 select locations, and then combined with results from visual inspection and targeted underside sounding to produce the revised partial and full-depth repair plans. The use of GPR provided significant time and cost savings to the original design methodology, which would have required approximately 30 nights of sounding to fully cover the deck area due to the contract-specified nighttime lane closure constraints and time associated with managing the removal and replacement of the asphalt overlay. The relatively efficient GPR survey saved over $500k in traffic control, labor, and material cost; which was split between the owner and contractor as part of a “value engineering” initiative. The paper describes the project background, the alternate design methodologies, details of the GPR data collection, analysis, core calibration, and the ultimate use of the results.

References

1.  ASTM “Standard Test Method for Evaluating Asphalt-Covered Concrete Bridge Decks Using Ground Penetrating Radar” Designation D 6087-05, ASTM International, West Conshohocken, PA, 2005.

2. Barnes, Christopher L., and Jean-Francois Trottier. "Effectiveness of Ground Penetrating Radar in Predicting Deck Repair Quantities." ASCE. Journal of Infrastructure Systems  10.2 (2004) pp:69-76

3. 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, Massachusetts, 1990.

4. Maser, K.R., and Roddis, W.M.K “Principles of Radar and Thermography for Bridge Deck Assessment”, ASCE Journal of Transportation Engineering , Vol. 116, No. 5, Sept/Oct, 1990.

5. Maser, K., Martino, N, Doughty, J. and Birken, R. "Understanding and Detecting Bridge Deck Deterioration using Ground Penetrating Radar", TRB 91st Annual Meeting, Paper 12-1765, January, 2012.

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