Filtern
Dokumenttyp
Referierte Publikation
- nein (8)
Schlagworte
- Radar (3)
- Non-destructive testing (2)
- Zerstörungsfreie Prüfung im Bauwesen (2)
- Antenna (1)
- Antennenentwicklung (1)
- Beton (1)
- CFK-Laminate (1)
- Civil engineering (1)
- Concrete (1)
- Cultural heritage (1)
The application of impulse radar for structural investigation of concrete elements has been increased during the last years related to technical developments, i. e. of high frequency antennas. In this paper, case studies will be presented related to the location of reinforcing bars, tendon ducts and repaired concrete areas in concrete bridges, anchors and dowels in concrete highways and delaminations of layered structures as they are used for non-ballasted railway tracks. It is shown that impulse radar can be applied in case of regular inspection and for searching the cause of damages but also for quality assessment in civil engineering.
Application of georadar for the determination of moisture content and distribution in masonry
(2003)
Das Impulsradarverfahren - ein Verfahren zur zerstörungsfreien Strukturaufklärung in Bauwerken
(2004)
Das Projektziel war die Vermeidung von Schäden bei Erdarbeiten und Ausschachtungen durch Entwicklung eines innovativen Bodenradarsystems mit wesentlicher Verbesserung des räumlichen Auflösungsvermögens bei der zerstörungsfreien Ortung von folgenden Objekten im Untergrund: Gasleitungen, Frisch- und Abwasserleitungen, Leitungen zur Elektrizitäts- und Kommunikationsversorgung aus verschiedenen Materialien und umgeben mit unterschiedlichen Böden mit variierendem Feuchtegehalt. Darüber hinaus ging es um die Reduzierung der Kosten und Erhöhung der Akzeptanz des Verfahrens durch eine schnelle Echtzeit-Interpretation der Messdaten.
CHEF provides knowledge about flood protection of cultural heritage objects and directly supports the European Floods Directive by giving recommendations on how to assess the vulnerability of monuments. A comprehensive analysis of protective measures BEFORE, DURING and AFTER a flood has been carried out within the project, including technical and administrational measures. An overview of these measures is given, followed by recommendations on how to establish the most effective protective strategies.
In this paper, a new method for the investigation of the degradation of ballast railway track beds is proposed. An array of antennas is used for simultaneous acquisition of reflected radar impulses, which have been transmitted from different sending positions. This array setup allows an automated CMP-measurement, which enables a direct calibration of the ballast thickness. These multiple offset measurements using the array setup are well suited for fast railway inspections. The method offers the possibility to visualize the state of degradation of the ballast in a velocity spectrum.