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A platform for research: civil engineering, architecture and urbanism
Influence of surface properties on the detection and quantification of voids in concrete structures using active thermography
Impulse thermography is an active method for quantitative investigations of the near surface region of various structures. It has recently been applied and optimized to applications in civil engineering. In this paper, the influence of different surface treatments of a concrete test specimen on the location of voids and honeycombing simulated by polystyrene cubes and cubes made of porous concrete at depths of 6 and 10 cm was investigated. In summary, the following conclusions can be drawn: After a heating duration of 15 min, all cubes can be detected in the phase images, while in the thermograms, only the cubes at the lower depth of 6 cm are visible. Three different surface modifications like mechanically treatment, deposition of vaseline and covering with white wall paint were performed. Only the influence of the white wall paint can be detected. The white wall paint has a large influence on the thermogram due to the reduced emissivity. This yields to a reduced detectability of the underlying inhomogeneities. In the phase image at lower frequency, the influence of the white wall paint is considerably reduced.
Influence of surface properties on the detection and quantification of voids in concrete structures using active thermography
Impulse thermography is an active method for quantitative investigations of the near surface region of various structures. It has recently been applied and optimized to applications in civil engineering. In this paper, the influence of different surface treatments of a concrete test specimen on the location of voids and honeycombing simulated by polystyrene cubes and cubes made of porous concrete at depths of 6 and 10 cm was investigated. In summary, the following conclusions can be drawn: After a heating duration of 15 min, all cubes can be detected in the phase images, while in the thermograms, only the cubes at the lower depth of 6 cm are visible. Three different surface modifications like mechanically treatment, deposition of vaseline and covering with white wall paint were performed. Only the influence of the white wall paint can be detected. The white wall paint has a large influence on the thermogram due to the reduced emissivity. This yields to a reduced detectability of the underlying inhomogeneities. In the phase image at lower frequency, the influence of the white wall paint is considerably reduced.
Influence of surface properties on the detection and quantification of voids in concrete structures using active thermography
Einfluss der Oberflächeneigenschaften auf den Nachweis und die Quantifizierung von Hohlräumen in Betonbauteilen mittels aktiver Thermographie
Maierhofer, C. (author) / Röllig, M. (author) / Kreutzbruck, M. (author)
2008
7 Seiten, 4 Bilder, 13 Quellen
Conference paper
Storage medium
English
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