Monitoring steel corrosion by using the combination of ultrasonic guided wave and acoustic emission

Corrosion of steel bars in reinforced concrete structure will reduce the bearing capacity of the structure, which will cause damage to the structure and cause great casualties and economic losses. In this paper, the same specimen was monitored by using the ultrasonic guided wave (UGW) and acoustic emission (AE). The variation trend of the cumulative number of acoustic emission impacts and the amplitude variation trend of ultrasonic guided waves were obtained in the process of monitoring steel corrosion. By analysing the curve of cumulative number of impacts and the curve of the amplitude of ultrasonic guided wave changing with time, it can be accurately obtained that the corrosion of steel reinforcement can be divided into three stages, so that the feasibility of monitoring the corrosion process of steel reinforcement can be verified by ultrasonic guided wave and acoustic emission. (paper)