Zerstörungsfreie Risstiefenbestimmung in Betonbauwerken mittels Radiotracerverfahren

At the Leipzig Technical University a method was developed, which allows to determine nondestructively the crack depth in concrete up to 15 cm. Based on a radiotracer technique the access to only one side of the object is required. The labelling of artificial-made cracks was carrie out by use of a transport medium (not miscible with water) on the base of methyl isobutyl ketone (MIBK) and In-113m as radionuclide. For the calculation of crack depth, measure-geometrical paramters were used. The improvement of the reliability of building-diagnostical interpretation using radio-physical parameters is described. A first application is provided for concrete structures below chemical equipments built as a barrier against ecologicall harmful substances (petrol tanks). The intersectional aspect of further qualification of the technique is emphasized.