Imaging of Early-Stage Cracking on Real-Size Concrete Structure from 4-Points Bending Test

Yuxiang Zhang 1 Eric Larose 1 Thomas Planes 2 Gautier Moreau 3 Claude Rospars 4
1 ISTerre - Institut des Sciences de la Terre
2 Civil and Environmental Engeineering [Colorado]
3 EDF - EDF
4 3S-R - Laboratoire sols, solides, structures - risques [Grenoble]
Abstract : Traditional ultrasonic imaging techniques encounter difficulty on complexes material such as concrete, which is in part due the use of coherent waves in a very heterogeneous material. From this angle, technique called LOCADIFF has been developed for monitoring heterogeneous media using multiply scattered waves [1, 2]. We consider that modifications in the medium are equivalent to the presence of extra scatterers, which are characterized by their effective scattering cross-section σ,. Within this view, LOCADIFF allows to locate the modification by measuring the spatio-temporal de-correlation of multiply scattered waves and by solving the corresponding inverse problem. Based on LOCADIFF, a newly developed imaging technique has been reported [3]. By mapping the intensity of modification on localized microstructure, the new technique is able to detect perturbations at multiple locations. Here we present the application of this new technique on a real-size 15 tons concrete structure for imaging early-stage cracking procedure issued from four point bending load, as part of the CEOS.fr project. Experimental results show that this technique can not only locate cracks that appeared simultaneously at multiple locations, but also detect them and observe their developments since an early-stage.
Keywords : Damage detection and localization Ultrasonic for (seismic acoustic) methods Interferometry
Type de document :
Communication dans un congrès
Le Cam, Vincent and Mevel, Laurent and Schoefs, Franck. EWSHM - 7th European Workshop on Structural Health Monitoring, Jul 2014, Nantes, France. 2014
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Yuxiang Zhang, Eric Larose, Thomas Planes, Gautier Moreau, Claude Rospars. Imaging of Early-Stage Cracking on Real-Size Concrete Structure from 4-Points Bending Test. Le Cam, Vincent and Mevel, Laurent and Schoefs, Franck. EWSHM - 7th European Workshop on Structural Health Monitoring, Jul 2014, Nantes, France. 2014. 〈hal-01021035〉

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