Monitoring Chloride-Induced Corrosion in HYSD 500 Grade Steel and Epoxy Coated Steel Bars Using the Electro Mechanical Impedance Technique
摘要
The durability and security of reinforced concrete (RC) structures, particularly in chloride-rich environments, rely significantly on structural health monitoring (SHM). This study examines corrosion monitoring in high yielding strength deformed steel (HYSD) 500 grade Rebars and epoxy coated steel bars exposed to chloride ingress using the electro-mechanical impedance (EMI) technique. Before immersing the steel bars in chloride solutions, simulating marine or de-icing conditions, baseline impedance readings were recorded using piezoelectric sensors attached to the rebars. Impedance data was then continuously collected to track corrosion related changes in mechanical properties. The initial findings reveal distinct impedance patterns for the two types of steel bars. Compared to HYSD 500 grade steel, epoxy coated bars exhibited slower and less pronounced impedance variations, indicating greater resistance to corrosion and chloride penetration. These results validate the EMI technique as an effective and reliable method for early detection of chloride induced corrosion, offering valuable insights for real time SHM. The study underscores the superior corrosion resistance of epoxy coated bars and their potential to enhance the lifespan of RC structures. Additionally, it highlights the importance of innovative SHM techniques in infrastructure management, contributing to more effective maintenance strategies.