Ultrasonic imaging-A novel way to investigate corrosion status in post-tensioned concrete members

The problem of durability in reinforced concrete structures is most prevalent in chloride-induced corrosion of reinforcing steel. Traditional corrosion monitoring techniques such as half-cell potential and corrosion rate measurements often fail when used in this type of structure and standard nondestructive testing methods such as impact-echo have also encountered problems. This study introduces a new method called C-scan imaging to evaluate grouted post-tensioned tendons. Preliminary investigations on lab specimens show promise for the technique.