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Eingeladener Vortrag
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Die Kombination und direkte Datenfusion der Ergebnisse von 3DLaserscannern
zur Erfassung der Geometrie und der aktiven Thermografie zur
Ortung verdeckter Hohlstellen und anderer Inhomogenitäten liefert umfassende
quantitative Informationen über die Zuordnung von Merkmalen und Veränderungen
eines Bauteils. In diesem Beitrag werden die erforderlichen Verfahrensspezifikationen,
das Prinzip der Datenüberlagerung und ausgewählte Fallstudien aus der
Denkmalpflege vorgestellt.
The delamination of a plaster layer, which covers a concrete structure, can be detected by active thermography. In this paper, a systematic series of measurements is described, where the gap between plaster and concrete was varied. These investigations were compared to FEM-simulations. The experimental and simulated data were in good agreement. It was found that the used experimental setup yields only marginal differences between fixed and lose plaster in the thermal behavior. However, significant characteristics within the temperature decays could be resolved, which are clearly related to the air gap.
Applications of infrared thermography in civil engineering are not limited to the identification of heat losses in building envelopes. Active infrared thermography methods enable structural investigations of building elements with one-sided access up to a depth of about 10 cm. Masonry and especially historical masonry has a very heterogeneous structure containing several different materials (brick, stone, mortar, plaster, wood, metal, etc.) with various thermal properties. As many classes of damage originate from defects that are close to the surface, active thermography is in general very well suited to assessing different test problems in cultural heritage buildings. In this paper, the physical background, equipment, environmental influences and material properties are discussed. Several application results are presented. It is shown how active thermography can be integrated into a holistic approach for the assessment of historical structures.