Filtern
Dokumenttyp
Schlagworte
- Beton (6)
- Concrete (6)
- Impuls-Thermografie (6)
- Hohlstellen (5)
- Non-destructive testing (5)
- Simulation (5)
- Civil engineering (4)
- Impulse thermography (3)
- Thermografie (3)
- Zerstörungsfreie Prüfung im Bauwesen (3)
Eingeladener Vortrag
- nein (3)
New thermography systems enable the application of active investigation techniques, i.e. the observation of the cooling down process after heating the surface of a structure under investigation. Defects like voids in concrete having a different thermal diffusivity in comparison to the bulk material are visualised by different surface temperatures. The differences between temperature transient curves above sound regions and above inhomogeneities are expected to include information about the defect parameters.
Experimental investigations with impulse thermography and radar on a concrete test specimen containing voids were analysed. Radar was used to determine the depth of the voids. The influence of size and depth of the voids on the temperature transient curves was studied for different heating times. The transient curves were also fitted with a simple semi-empirical model.
Impulse-thermography has been established as a fast and reliable tool in many areas of non-destructive testing. In recent years several investigations have been done to apply active thermography to civil engineering. For quantitative investigations in this area of application, finite difference calculations have been performed for systematic studies on the influence of environmental conditions, heating power and time, defect depth and size and thermal properties of the bulk material (concrete). The comparison of simulated and experimental data enables the quantitative analysis of defects.
Active Infrared Thermography in Civil Engineering - Quantitative Analysis by Numerical Simulation
(2003)
Active infrared thermography in civil engineering - quantitative analysis by numerical simulation
(2003)
The cooling-down process of building structures after heating-up with an external radiation source was analysed to detect voids inside and below the surface. Quantitative results of concrete test specimen containing voids with different sizes at various depths will be presented here. The experimental results were compared to numerical simulations performed with a Finite Difference program developed at BAM.
Ziel der Untersuchungen ist die Weiterentwicklung der Impuls-Thermografie als quantitatives zerstörungsfreies Prüfverfahren zur Ortung oberflächennaher Inhomogenitäten in Bauteilen und Bauwerken.
Zur Zeit werden Putzablösungen auf Mauerwerk bzw. Beton, Hohlstellen und Kiesnester in Beton, Ablösungen und Hohlstellen bei Spaltklinkern im Dickbettmörtel auf Beton, Verbundprobleme von CFK-Laminaten auf Beton sowie Ablösungen von Bitumen-Abdichtungsbahnen auf Stahl untersucht.