Concrete structures worldwide are now facing deterioration problems related to their ageing. Safety control of existing structures requires the definition of appropriate monitoring and surveillance programmes. Visual inspection plays a vital role in the safety control process; it is supported basically by human expertise without the assistance of any dedicated device or system. The availability of combined terrestrial imaging systems has encouraged the development of a new methodology aimed at registering and codifying into an electronic environment, the main deficiencies typically surveyed during visual inspections. A case study is described here in which such methodology was applied to a concrete arch dam.
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