Fig. 14From: Seasonal Variation and Age-related Changes in the Relative Permittivity of Concrete Bridge Decks on Korea ExpresswaysCondition maps of concrete bridge decks obtained from air-coupled GPR measurements. a cut-off relative permittivity over 12, b cut-off relative permittivity under 6 and over 11, and c depthcorrected attenuation map based on the reflection from the top rebars.Back to article page