The aim of this study is to measure the level of reinforcing rod corrosion in concrete structures by means of fully non-destructive measurements. In this report, a two transducer method (oscillator: diameter 20 mm, central frequency 2.0 MHz; sensor: diameter 20 mm, central frequency 2.0 MHz, and diameter 40 mm, central frequency 500 kHz) was used to apply ultrasonic to test pieces in which varying levels of reinforcing rod corrosion weight loss had been induced by electrolytic corrosion. As a result, the spectral intensity in the 100-300 kHz band was fond to be correlated to the amount of reinforcing rod corrosion when using a 20 mm diameter transducer on the receiving side when the reinforcement rod covering is 10 mm or 30 mm, and when using a 40 mm diameter transducer on the receiving side when the reinforcement rod covering is 50 mm.
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