In this paper we evaluate the utility of microwave and mechanical wave nondestructive testing techniques to detect delamination in reinforced concrete bridge deck mock-up samples. The mechanical wave tests comprise air-coupled impact-echo measurements, while the microwave measurements comprise three-dimensional synthetic aperture radar imaging using wideband reflectometery in the frequency range of 1-4 GHz. The results of these investigations are presented in terms of images that are generated from these data. Based on a comparison of the results, we show that the two methods are complementary, in that provide distinct capabilities for defect detection. More specifically, the former approach is unable to detect depth of a delaminated region, while the latter may provide this information. Therefore, the two methods may be used in a complementary fashion (i.e., data fusion) to give more comprehensive information about the 3D location of delamination.

Meeting Name

40th Annual Review of Progress in Quantitative Nondestructive Evaluation, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics (2013: Jul. 21-26, Baltimore, MD)


Electrical and Computer Engineering

Keywords and Phrases

Concrete Bridge Decks; Flexural Mode; Impact-Echo; Microwave Imaging; Near-Surface Delaminations; Synthetic Aperture Radar; Data Fusion; Mechanical Waves; Nondestructive Examination; Radar Imaging; 3d Locations; Air-Coupled; Comprehensive Information; Defect Detection; Frequency Ranges; Delamination

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version

Final Version

File Type





© 2014 American Institute of Physics (AIP), All rights reserved.

Publication Date

01 Jul 2014