Ultrasonic guided waves for monitoring corrosion of FRP wrapped concrete structures
MetadataShow full item record
Reinforced concrete (RC) structures affected by corrosion of steel bars are often repaired and rehabilitated by wrapping fibre reinforced polymer (FRP) sheets. Most commonly available FRP materials are glass and carbon fibre composites. This paper uses ultrasonic guided waves as a non-destructive tool to monitor the initiation and progression of corrosion in reinforcing bars in concrete after repairing with bonded FRP sheets. Concrete cylinders embedded with reinforcing bars are subjected to accelerated impressed current corrosion in chloride environment. After specific days of exposure to corrosive environment the cylinders are repaired by wrapping with GFRP and CFRP sheets. Anodic current was further continued for specified times. Specific core and surface seeking guided wave modes were used to ultrasonically measure the resistance offered by FRP wraps to corrosion. The ultrasonic measurements were correlated with destructive parameters of pull-out strength and mass loss. This paper demonstrates that guided waves were able to discern the corrosion protection offered by the FRP. It is observed that Glass FRP gives better protection than Carbon FRP.
Showing items related by title, author, creator and subject.
Sharma, S.; Mukherjee, Abhijit (2010)Corrosion of reinforcing steel in concrete is one of the major durability problems faced by civil engineers as they maintain an aging infrastructure. The problem accelerates since steel is embedded inside concrete. If it ...
Sharma, S.; Mukherjee, Abhijit (2011)Ultrasonic guided waves have been used for monitoring progression of rebar corrosion in concrete in chloride and oxide environments. The effect of rates of corrosion in the two environments on the ultrasonic signals is ...
Sharma, S.; Mukherjee, Abhijit (2013)This work reports nondestructive evaluation of reinforcing bars that are corroding in the presence and absence of chlorides utilizing ultrasonic guided waves. The effect of rates of corrosion and its progression in the ...