Monitoring of autogenous crack healing in cementitious materials by the nonlinear modulation of ultrasonic coda waves, 3D microscopy and X-ray microtomography
Résumé
In this work the non-destructive monitoring of the self-healing progress of cracked mortars is presentedthrough the use of three combined methods: nonlinear Coda Wave Interferometry, 3D microscopy and Xray computed microtomography (CT). The aim of the acoustic method is to compare, at various healingstages, both the ultrasonic velocity variations and decorrelation coefficients between a reference codasignal and a signal perturbed by a high level lower-frequency elastic wave. The decrease in the relativevariation of the extracted nonlinearities demonstrates its ability to accurately monitor global crack filling.3D microscopy also reveals this capability. Measurement results of these two techniques agree for theinfluence of age at cracking on healing potential. In reducing the voxel size to 12 lm, X-ray CT imagesconfirm the creation of localized bridges between crack faces and provide information on their location.
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