Full-resolution 3D imaging for concrete structures with dual-polarization GPR

Abstract Ground-penetrating radar (GPR) is one of the most commonly used technologies for concrete inspection. This technology's main limitation is that its raw data are complex and only understood by GPR experts. Thus, this study's ultimate goal was to explore effective strategies for transforming GPR data collected by dual-polarization antennas into a more intuitive form of three-dimensional (3D) images. To understand the strategies' performance, they were implemented on a 1mx1m section of a reinforced concrete slab specimen. The evaluation of the results indicated a great benefit of the dual-polarization GPR system that created an accurate, high-resolution 3D representation of concrete with a single scanning direction dataset. More importantly, while there were differences between the 3D images obtained by different polarization, their combined use provided a comprehensive visualization of the concrete specimen's interior, which displayed reinforcements in two directions, steel bar debonding, and concrete delamination.

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