Non-Destructive Testing in Civil Engineering -Automated Testing with Radar, Impact-Echo and Ultrasonic Echo at a PT-Bridge across the river Fulda

Stability and durability of post-tensioned concrete bridges are mainly determined by the state of the reinforcement and the tendons. Detailed information about the kind and the extension of damages or about suspected non-visible damages have to be gained through additional analyses on object level. The number of the destructive tests can be significantly reduced by application of efficient non-destructive test methods. The efficiency of automated non-destructive test methods radar, impact-echo and ultrasonic echo has been demonstrated by measurements on the bridge "Fuldatalbrucke"near Eichenzell. The methods were applied to detect the reinforcement, internal tendons and to locate possible voids in the tendon ducts. The results of the investigations are presented in a number of images.