Einsatz eines mobilen NMR-Sensors als zerstörungsfreies Messsystem in der Bauwerkserhaltung

Application of a mobile NMR sensor as a non-destructive measurement system in the field of maintenance.

The potential to use the NMR-MOUSE® as non-destructive analytical tool in building maintenance is demonstrated on two examples. The first one covers moisture transport through fine grained concrete matrices, whereas in the second one the NMR-MOUSE is used to determine the layer thickness of selected coating systems for concrete protection.
In using this NMR technique, significant moisture profiles have been determined in fine grained concrete matrices with a maximum measuring depth of 5 mm and a depth-resolution of 250 µm. The NMR technique also allows observing the time depended progress of capillary water uptake and evaluating the effects of polymer modifications of the concrete matrix.
Furthermore, the layer thickness of one model coating system and two OS 11a-coating systems were determined on the basis of depth profiles. The results show, that layer thickness between 50 and 200 µm can be determined with a standard deviation of about 5 µm.