Factors affecting the delamination of detectability in GPR images

Kien Dinh; Nenad Gucunski

doi:10.1117/12.2582435

22 March 2021 Factors affecting the delamination of detectability in GPR images

Kien Dinh, Nenad Gucunski

Proceedings Volume 11592, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XV; 1159206 (2021) https://doi.org/10.1117/12.2582435
Event: SPIE Smart Structures + Nondestructive Evaluation, 2021, Online Only

Abstract

Concrete delaminations are commonly-found defects in bridge decks and rigid pavements. While previous studies reported that ground-penetrating radar (GPR) could visualize those defects in many instances, it is still unclear about the factors that may affect such an application. For this reason, this study aimed to develop an understanding of the factors that influence the detectability of concrete delamination in GPR images/signals. Concerning the methodology, the study was conducted using both synthetic data generated from a GPR simulation program, and real data collected on a concrete bridge deck specimen. The analysis of such image data indicated the following. First, there is always some energy reflected from concrete delamination. However, its shape and strength are affected by the thickness of the delamination, the material (air or water) within it, and the peak (most energetic) frequency of the emitted signal. Second, the depth of delamination and its position relative to reinforcing steel bars might impact its visibility in GPR images.

Conference Presentation

Citation Download Citation

Kien Dinh and Nenad Gucunski "Factors affecting the delamination of detectability in GPR images", Proc. SPIE 11592, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XV, 1159206 (22 March 2021); https://doi.org/10.1117/12.2582435

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