Abstract
This article presents a methodology that can be used to identify and estimate the positions of features within the hidden bearing region of Reinforced Autoclaved Aerated Concrete (RAAC) roofing planks. The method requires the careful design of a dielectric filled wedge to hold a Ground Penetrating Radar (GPR) sensor at a fixed angle relative to the surface of RAAC planks to enable novel angled beam examination of the end bearing. Interpretation can be performed using time-of-flight and Fermat’s principle. The approach was experimentally trialed on in-situ RAAC ceiling planks within an active hospital estate with the results validated by conventional intrusive surveying techniques, demonstrating agreement with the GPR results.
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