Prüfung von Ortbetonauskleidungen mit Ultraschallverfahren

The contribution discusses practical experiences obtained mainly by application of the impact pulse echo technique at plate-like concrete members. The technique, sometimes developed by Sonsalone in the US, shows a excellent detectability fo different given nonconformities like voids and cracks, i.e. wiht a horizontal orientation. Nests of grovel - because of larger scattering - can be detected and localized. The interpretation is a problem because of the less of frequency ports in the spectrum.