In this research, four embedded ultrasonic piezoelectric transducers were combined to form cross pair and opposite pair monitoring schemes for continuously monitoring the damage to different strength grades of concrete caused by the corrosion of reinforcements under accelerated corrosion conditions. The damage process was analyzed by combining the electrochemical effects of steel corrosion, that is, half-cell potential and galvanic current tests. Results show that the embedded ultrasonic transducer method can detect damage of concrete during steel corrosion and that each stage of damage can be determined from the plots of ultrasonic transducer data versus corrosion rate. The results further indicate that a combination of cross pair and opposite pair testing methods can more comprehensively reflect the damage to concrete caused by the expansion of corrosion of steel bars, than a single testing method. Since electrochemical testing can only depict the corrosion state of steel rebars, it is beneficial to use embedded ultrasonic measurements to monitor the damage process of concrete. The differences in damage between different strength grades of concrete, that is, the resistance to corrosion of steel bars and brittle failure, can be obtained from the plots of ultrasonic transducer data.

在本研究中，四个嵌入式超声压电换能器组合形成交叉对和对向监测方案，用于连续监测在加速腐蚀条件下钢筋腐蚀对不同强度等级混凝土的破坏。结合钢腐蚀的电化学效应，即半电池电位和电流测试，分析了损伤过程。结果表明，嵌入式超声换能器方法可以检测钢筋腐蚀过程中混凝土的损坏情况，并且可以从超声换能器数据与腐蚀速率的关系图中确定每个损坏阶段。结果进一步表明，交叉对和对向对检测方法相结合，比单一检测方法能更全面地反映钢筋锈蚀膨胀对混凝土的破坏情况。由于电化学测试只能描绘钢筋的腐蚀状态，因此使用嵌入式超声波测量来监测混凝土的损坏过程是有益的。不同强度等级混凝土之间的损伤差异，即钢筋的抗腐蚀性能和脆性破坏，可以从超声换能器数据的绘图中得到。