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Organisationseinheit der BAM
- 8 Zerstörungsfreie Prüfung (30)
- 8.0 Abteilungsleitung und andere (29)
- 9 Komponentensicherheit (10)
- 9.3 Schweißtechnische Fertigungsverfahren (7)
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- 9.6 Additive Fertigung metallischer Komponenten (3)
- 6 Materialchemie (2)
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- 7 Bauwerkssicherheit (2)
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Eingeladener Vortrag
- nein (28)
Application of georadar for the determination of moisture content and distribution in masonry
(2001)
Today's civil engineering NDT needs are for quantitative, fast to apply and easy to interpret methods. They are required on site both for evaluation of existing structures/infrastructure and for quality control in new construction. With this purpose, BAM has carried out in-situ feasibility studies, using radar, impact-echo and ultrasonic-echo methods. Two examples are given of their combined application on different railway slab–track constructions, using high frequency radar, scanning impact-echo and ultrasonic array methods. The aim was to evaluate limitations and advantages, comparability and complementarity of these methods. The on-site measurements demonstrated the possibility to investigate, with good accuracy via NDT, the bonding conditions between sleepers and slab, to locate voids and measure layer thickness. The acoustic and electromagnetic methods used, were found to be complementary.
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.