Sensitivity of Ultrasonic Coda Wave Interferometry to Material Damage—Observations from a Virtual Concrete Lab

Ultrasonic measurements are used in civil engineering for structural health monitoring of concrete infrastructures. The late portion the ultrasonic wavefield, coda, is sensitive to small changes elastic moduli material. Coda Wave Interferometry (CWI) correlates these coda with wavefield recorded intact, or unperturbed, specimen reveal amount velocity change that occurred. CWI has potential detect localized damages and global reductions alike. In this study, sensitivity different types mesostructures their damage levels investigated numerically. Realistic numerical models generated, evolution simulated using discrete element method. virtual lab, propagated from one transducer a realistic source signal at second transducer. Different scenarios slope decorrelation waveforms observed reduction velocities Finally, impact possible generalizations findings discussed, recommendations given application scale.