This paper describes a thorough investigation of two bridge decks using ground penetrating radar (GPR), infrared thermography (IR), chain drag, crack mapping, coring, and chloride ion concentra-tion measurements. It discusses the use of GPR for the detection of bridge deck flaws at the rein-forcing steel level and the use of IR for the identification of overlay delamination. The GPR and IR results are compared to the results obtained from sounding the bridge decks. The correlation between the damages detected using GPR and IR and the conventional chain drag technique is discussed. Combined together, the nondestructive methods used in this study complemented each other to provide the maximum amount of informa-tion and create a more effective bridge deck condition assessment. Infrared thermography was effective in the detection of shallow delamination. Ground penetrating radar detected damage at the rebar level and damage extending upward from the corroding rebar to about 2.5 cm from the deck surface. Unlike chain drag, which detects disconti-nuities in advanced stages, GPR detected features associated with rebar corrosion, such as high-moisture content and high chloride ion concentra-tions, in early stages. A comprehensive rehabilitation approach of the two structures is proposed.
AASHTO, 2016, AASHTO T 260 97th Edition: Standard Method of Test for Sampling and Testing for Chloride Ion in Concrete and Concrete Raw Mate-rials, American Association of State Highway and Transportation Officials, Washington, DC.
ACI, 2014, ACI 318-2014: Building Code Requirements for Structural Concrete and Commentary, American Concrete Institute, Detroit, MI.
ASTM, 2012, ASTM D4580/D4580M – 12, Standard Practice for Meas-uring Delaminations in Concrete Bridge Decks by Sounding. American Society of Testing and Materials, West Conshohocken, PA.
ASTM, 2013, ASTM D4788 – 03, Standard Test Method for Detecting Delaminations in Bridge Decks Using Infrared Thermography, American Society of Testing and Materials, West Conshohocken, PA.
ASTM, 2015, ASTM D6087 – 08, Standard Test Method for Evaluating Asphalt-Covered Concrete Bridge Decks Using Ground Penetrating Radar, American Society of Testing and Materials, West Conshohocken, PA.
FHWA, 2011, FHWA-HIF-11042, Bridge Preservation Guide: Maintaining a State of Good Repair Using Cost Effective Investment Strategies, Federal Highway Administration, Washington, DC.
Iowa Department of Transportation, 2011, Final Report SPR-NDEB (90)-8H-00, Comprehensive Bridge Deck Deterioration Mapping of Nine Bridges by Nondestructive Evaluation Technologies, Iowa Department of Transporta-tion, Ames, IA.
Maser, K., 2009, “Integration of Ground Penetrating Radar and Infrared Thermography for Bridge Deck Condition Evaluation,” Non-Destructive Testing in Civil Engineering (NDTCE) 2009, Nantes, France.
Milovanovic, B., and I. B. Pecur, 2016, “Review of Active IR Thermography for Detection and Characterization of Defects in Reinforced Concrete,” Journal of Imaging, Vol. 11, doi:10.3390.
RADAN 7, 2011, Geophysical Survey Systems, Inc. (GSSI), Nashua, NH.
TRB, 2013, SHRP 2 Report S2-RO6A-RR-1, Nondestructive Testing to Identify Concrete Bridge Deck Deterioration, SHRP 2 Report S2-RO6A-RR-1, Transportation Research Board, Washington, DC.
Tinkey, Y., and L. Olsen, 2010, IDEA Program Final Report, Vehicle-Mounted Bridge Deck Scanner, Olsen Engineering, Wheat Ridge, CO.
261 Page Views
0 PDF Downloads
0 Facebook Shares