Steel bars, or rebars, with anti-rusted coating are used in reinforced concrete structures at corrosion-critical circumstances. The bond strength between coated rebars and covered concrete is resulted from the adhesion at the steel-concrete boundary, the frictional force, and the interlocking force provided by the raised ribs at the steel bar surface. The pull-out tests showed that coated rebar had lower bond strength. Current study demonstrated the feasibility of probing test concrete blocks using high-power sound waves generated by piezoelectric transducers. It is similar to ordinary ultrasonic scanning with lower frequency and higher energy. Preliminary resutls showed strong relation existed betwee anti-rusted coating of rebar and elastic wave attenuation.
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