コンクリート中に埋設された腐食鉄筋の渦流試験
1993 年 31 巻 4 号 p. 236-243
詳細
1993 年 31 巻 4 号 p. 236-243
A eddy current method is used for the detection of cracks in metal materials and reinforcing steel bars buried in concrete structures. In the experiment, two types of probe coil were used, and the test frequencies of 2, 8, 32, and 128kHz were applied. Lissajous' pattern of signal from mortar, contaminated mortar zone and corroded reinforcing bar in concrete were measured to provide fundamental data for bars. The results obtained were as follows:
The amplitude and phase of Lissajous' pattern of signal obtained from bars barely change with or without concrete. Lissajous' pattern was influenced by the mortar zone, contaminated mortar zone, and reinforcing bars with corroded or not.
The amplitude is increased and the phase is shifted in a clockwise rotation as the test frequency is increased.
