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Zusammenfassung
In der Geophysik wird seit einiger Zeit das Verfahren der "Spektralen Induzierten Polarisation (SIP)"eingesetzt, um nähere Informationen über die Art, die Struktur und den Zustand des Bodens zu erhalten. Die Methode beruht auf der Messung des komplexen spezifischen elektrischen Widerstands im Frequenzbereich zwischen 1 mHz und 10 kHz.
Die SIP kann neue Möglichkeiten beim Einsatz elektrischer Verfahren in der Bauwerksuntersuchung eröffnen. So lassen sich beispielsweise Materialunterschiede von Feuchteinhomogenitäten trennen, was mit konventioneller Widerstandsmessung nicht möglich ist. Ebenfalls denkbar ist eine Detektion kontaminierter Bereiche (z. B. bei starker Belastung durch organische Substanzen oder Salze) im Mauerwerk.
Vorgestellt werden das Verfahrensprinzip, die Messtechnik und erste Ergebnisse von Messungen an Mauerwerksziegeln.
Non Destructive Testing of Concrete Railway Tracks by Impulse Response and Impact Echo Techniques
(2003)
Spectral Induced Polarization - a Tool for Non-Destructive Testing of Soils and Building Materials
(2003)
The Spectral Induced Polarization (SIP) is a newly developed non-destructive geophysical method. It is an extension of conventional electrical resistivity measurements. By measuring additional parameters a more detailed investigation of the subsurface is possible. Up to now SIP is mainly used in mineral exploration, but the number of application examples from near surface geophysics and civil engineering is increasing. Results are presented from the investigation of slag heaps and measurements on bricks.
Pile testing as a NDT-CE (non-destructive-testing in civil engineering) method provides information about the condition of foundations. It is also used as a tool for quality control. Real size test fields with sound piles, piles with flaws and piles connected with a foundation allow calibration of measurement devices and method comparison under "real" conditions. Such a site is planned on a BAM testing area south of Berlin. The joint use facilitates the establishment of the testing site as a national or European reference site.