Monitoring uniform and localized corrosion in reinforced mortar using high-frequency guided longitudinal wages
2008
High-frequency guided longitudinal waves have been used in a through-transmission arrangement to monitor reinforced
mortar specimens undergoing both accelerated uniform and localized corrosion. High-frequency guided longitudinal
waves were chosen because they have the fastest propagation velocity and lowest theoretical attenuation for the
rebar/mortar system. This makes the modes easily discernible and gives them the ability to travel over long distances.
The energy of the high-frequency longitudinal waves is located primarily in the center of the rebar, leading to less
leakage into the surrounding mortar. The results indicate that the guided mechanical waves are sensitive to both forms
of corrosion attack in the form of attenuation, with less sensitivity at higher frequencies. Also promising is the ability to
discern uniform corrosion from localized corrosion in a through-transmission arrangement by examination of the
frequency domain.
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