Coda Wave Interferometry (CWI) for monitoring early-age cementitious mortar
Résumé
The hardening procedure of a cement-based mortar (mixed by cement past and uni- dimension glass beams) is studied with Coda Wave Interferometry (CWI) for a hydration time between 8 and 70 hours. Due to the continuous hydration of the cement paste, the hardening procedure involves not only a fast evolution of elastic properties, but also a autogenous shrinkage which can cause local stress and risks of micro-cracking. Traditional ultrasonic method (pulse velocity measurement) can estimate the variation of elastic properties by measuring compressive-wave's propagation velocity. Coda Wave Interferometry (CWI) of multiple scattered waves gives access to a velocity variation dominated by shear- waves. On the other hand, with the confirmed observation of micro-cracks occurring around cement/glass interfaces by Scanning Electronic Microscopy (SEM), we discuss the possibility of using CWI analysis for micro-cracking detection.
Domaines
Acoustique [physics.class-ph]
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