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International Journal of Concrete Structures and Materials
Fig. 12 | International Journal of Concrete Structures and Materials

Fig. 12

From: Evaluation of the Depth of Deteriorations in Concrete Bridge Decks with Asphalt Overlays Using Air-Coupled GPR: A Case Study from a Pilot Bridge on Korean Expressway

Fig. 12

Condition map based on the attenuation of EM waves measured by air-coupled GPR system on the pilot bridge: a depth-corrected attenuation of concrete cover (black lines indicating − 6 dB), b total attenuation at top rebar (black lines indicating − 26 dB) and c attenuation of pavement layer (black line − 26 dB). For a comparison, various types of damages on the surface in Fig. 5 are shown in the figure ( : core, : surface-breaking cracks, : efflorescence, : patching and : pothole).

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