Novel Nondestructive Evaluation of Corrosion on Rebar Embedded in Mortar Wall Using 10-GHz Doppler Sensor

Le résumé fourni par la source

This paper proposes a novel non-destructive method to detect corrosion on rebar embedded in a mortar wall using a 10-GHz Doppler sensor. The movement of the transmitting and receiving antennas parallel to the wall induced a Doppler shift, which suppressed unwanted reflections from the wall surface. This approach isolates the signal attenuation caused by rebar corrosion, enabling its direct measurement. The attenuation of 14 dB was observed due to the round-trip propagation in a 50 mm thick mortar wall, though the reflected level from the rebar can be detected. An attenuation of 7.8 dB was observed for a rebar with a 9 mm diameter and a corrosion level of around 100 mg/cm2placed behind a 50 mm thick mortar wall.

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