Monitoring the corrosion of reinforced concrete using the ultrasonic coda wave method
LDuo1, XU Jiahao1, HU Hongwei1, YI Shanchang2, WANG Lei2
1.College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2.College of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
Abstract:Aiming at the propagation velocity deviation of existing ultrasonic nondestructive testing methods in corrosion damage evaluation of reinforced concrete (RC), a monitoring method using coda wave interferometry (CWI) to characterize RC corrosion was proposed. Based on multiple scattering of ultrasonic propagation of concrete, corrosion damage evaluation indexes of CWI were established. A rapid electrochemical experiment was set up to monitor the corrosion process of RC at 0%, 1% and 2% corrosion rates. The relative velocity change "Δv" ⁄"v" and the decorrelation coefficient "K" _"d" were analyzed by stepwise CWI, and the influence of transducer arrangement on the sensitivity of coda corrosion monitoring was explored. The results show that "Δv" ⁄"v" decreases with the corrosion time, while "K" _"d" increases with the corrosion time. The CWI method can effectively monitor the corrosion crack propagation process of RC structure and has good sensitivity. The corrosion cracking of RC structure can be detected by three different arrangements of the transducer: vertical, opposite and same side, and the vertical arrangement is more sensitive to RC corrosion detection.
吕铎1,徐嘉豪1,胡宏伟1,易善昌2,王磊2. 基于超声尾波法的钢筋混凝土腐蚀监测研究[J]. 振动与冲击, 2024, 43(2): 264-270.
L Duo1, XU Jiahao1, HU Hongwei1, YI Shanchang2, WANG Lei2. Monitoring the corrosion of reinforced concrete using the ultrasonic coda wave method. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(2): 264-270.
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