Abstract
In this study, two kinds of: impact-elastic wave method and electromagnetic pulse method, are applied to lateral prestressing steel bars in existing prestressed concrete bridges to evaluate grouting conditions in tendon ducts. First of all, impact-elastic wave method was perfomed to evaluate the grouting condition in tendon ducts to measure elastic wave velocities. Then, electromagnetic pulse method was applied to detect voids in tendon ducts just below the measurement points by using maximum amplitude of received elastic waves. The evaluation results is verified by drilling and observing the actual grouting condition in tendon ducts. Non-destructive evaluation results show good agreement with those of visiual inspection.
