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- Masonry (3) (entfernen)
For the investigation of the complex inner structure of historic buildings, the application of radar has been increased during the last ten years. Although historic masonry in general is very inhomogeneous and although in some cases high absorption occurs due to enhanced moisture, radar has been successfully applied to get information on geometry, position of inclusions and about kind and size of existing damages. In this paper case studies will be presented concerning the localisation of metallic inclusions and the investigations of the structure of an exterior wall with a multiple leaf structure.
Non-destructive and minor destructive testing methods enable a classification of historic structures, building processes, applied building technologies and materials. Therefore, these methods should be part of the global investigation of historic buildings which is usually required before the planning of any building intervention. The case study presented herein encompasses experimental work carried out at the St. Servatius Church in Quedlinburg, Germany. Within a comprehensive restoration campaign, non-destructive on-site investigations were carried out with radar and ultrasonics. The results were combined with plans, views and cores recorded in advance.
In this contribution, the development and application of optical and thermographic methods for the nondestructive evaluation of delaminations, cracks and further substructures in Connection with bulging is presented.
Since delaminated fagade elements show geometric as well as thermal anomalies, surface geometry and defects beneath the surface were investigated. As methods, Stereo photogrammetry, a tracking based method for tactile recording of geometric 3D data and active thermography were used. Two case studies were assessed with a combination of these methods: the plaster scratches at the Magdeburg Cathedral and a mural painting in Cobbelsdorf, both located in Germany. While the plaster scratches have been investigated by artificial heating with an infrared radiator, the rural painting was tested by analysing the temperature increase due to solar heating.