Corrosion detection mechanism of rebar based on ground penetrating radar

HONG Shuxian, HUANG Zuming, CHEN Dingzhong, and DONG Biqin College of Civil and Transportation Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China Abstract: To study the mechanism of ground penetrating radar (GPR) on the detection of reinforcement corrosion, this paper employs GPR to periodically monitor the accelerated reinforcement corrosion process and designs various experimental setups to separate the effects of different corrosion patterns on GPR signals, including corrosioninduced cracks width and corrosion product diffusion. Results indicate that the reflected wave amplitude increases with accelerated corrosion before the appearance of corrosion-induced cracks. The reflected wave amplitude decreases with the widening of corrosion-induced cracks after their appearance. The reflected wave amplitude increases with the increase in the filling amount of corrosion product in vertical cracks. This study provides valuable insights into the relationship between GPR signals and reinforcement corrosion.