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Article Dans Une Revue NDT International Année : 2014

Steel detection in reinforced concrete wall by microwave infrared thermography

Franck Brachelet
Florin Breaban
  • Fonction : Auteur
Didier Defer

Résumé

This paper presents a NDT by infrared thermography with a microwave excitation system. The advantages of such stimulation lie in the volumetric absorption of incoming waves which lead to a greater sounded depth. The device generating the microwaves was made of a commercial magnetron 800 W at 2.45 GHz associated with a pyramidal horn antenna. This method was applied to detect the steel reinforcements (deformed bar 12 mm of diameter placing at every 10 cm) in a concrete specimen (1 m×1 m×6.5 cm) with a concrete cover of 3.8 cm. The specimen was heated with an average power of 600 W for 5 min. An infrared camera was placed on the same side as the stimulated surface and thermograms were recorded at regular intervals. The whole assembly was placed in a protective enclosure against high frequency electromagnetic fields. The method based on a contrast algorithm was used to analyze the thermogram series. The result shows a higher temperature rise in front of the steel reinforcement areas. The effect of microwave caused an increase in moderate temperature does not lead to alteration of inspected concrete.
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Dates et versions

hal-01074661 , version 1 (15-10-2014)

Identifiants

Citer

Sam Ang Keo, Franck Brachelet, Florin Breaban, Didier Defer. Steel detection in reinforced concrete wall by microwave infrared thermography. NDT International, 2014, 62, pp.172-177. ⟨10.1016/j.ndteint.2013.12.002⟩. ⟨hal-01074661⟩
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