This work reports nondestructive evaluation of reinforcing bars that are corroding in the
presence and absence of chlorides utilizing ultrasonic guided waves. The effect of rates
of corrosion and its progression in the two environments on the ultrasonic signals is
discussed. Surface and core seeking guided wave modes were used to monitor beams
undergoing accelerated impressed current corrosion. Effective combination of guided wave
modes could relate to the differences in corrosion mechanisms and rates in the two environments.
Calibration of the ultrasonic data with the physical condition of the bar in the two
environments has been attempted. It is done by conducting destructive tests of mass loss,
tensile strength, and pull out strength at different stages of corrosion.
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