United States Department of Transportation
i
Air-Launched GPR Evaluation for Rapid Assessment of MoDOT Bridge Decks [March 2015]
-
2015-03-01
[PDF-3.38 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:This study demonstrated the utility of the air-launched ground penetrating radar (GPR) tool in terms of evaluating the condition of MoDOT bridge decks. The objective was to confirm that the air-launched GPR tool can be implemented as a part of a long-term program that enables faster, better, and more cost-effective assessments of MoDOT bridge decks.
Ten bridge decks were investigated using an air-launched GPR system. Four of the bridge decks investigated were previously investigated using a ground-coupled GPR system, and results from those four bridge decks served as ground truth for the air-launched GPR interpretations. Findings show reasonably good spatial correlation between the ground-coupled GPR and air-launched GPR data sets in terms of deteriorated regions and overall percentages of deteriorated regions in terms of bridge deck surface area. Apparent discrepancies between the air-launched and ground-coupled GPR interpretations can be attributed to several factors, including interpolation between adjacent GPR traverses, differences in signal attenuation due to different antenna frequencies, and differences in signal resolution due to different distance from the antenna to the embedded reinforcing steel.
Recommendations for optimum acquisition, processing, and interpretation parameters for air-launched GPR reconnaissance-style assessment were provided as part of this study.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
