![]() Payan, C., Quiviger, A., Garnier, V., Chaix, J.F., Salin, J.: Applying diffuse ultrasound under dynamic loading to improve closed crack characterization in concrete. Snieder, R.: The theory of coda wave interferometry. Legland, J.-B., Zhang, Y., Abraham, O., Durand, O., Tournat, V.: Evaluation of crack status in a meter-size concrete structure using the ultrasonic nonlinear coda wave interferometry. Grêt, A., Snieder, R., Scales, J.: Time-lapse monitoring of rock properties with coda wave interferometry. International Society for Optics and Photonics (2017) ![]() In: Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure 2017. Hafiz, A., Schumacher, T.: Monitoring of applied stress in concrete using ultrasonic full-waveform comparison techniques. Stähler, S.C., Sens-Schönfelder, C., Niederleithinger, E.: Monitoring stress changes in a concrete bridge with coda wave interferometry. Planès, T., Larose, E.: A review of ultrasonic Coda Wave Interferometry in concrete. Murnaghan, F.D., Murnaghan, B.F.: Finite deformations of an elastic solid. Hughes, D.S., Kelly, J.L.: Second-order elastic deformation of solids. Zhang, Y., Abraham, O., Grondin, F., Loukili, A., Tournat, V., Duff, A.Le, Lascoup, B., Durand, O.: Study of stress-induced velocity variation in concrete under direct tensile force and monitoring of the damage level by using thermally-compensated Coda Wave Interferometry. Zhang, Y., Planès, T., Larose, E., Obermann, A., Rospars, C., Moreau, G.: Diffuse ultrasound monitoring of stress and damage development on a 15-ton concrete beam. The results show that MSC is capable of discriminating minute stress changes in a laboratory as well as a field setting. Finally, we discuss a field test involving a prestressed concrete bridge girder and a column. Second, two concrete prisms were used to study the effect of the frequency of the transmitted pulse. First, two concrete cylinders were cast and tested to study the effect of maximum aggregate size. The CWC technique was evaluated by investigating key influence parameters that affect the relationship between MSC and the applied stress. In this study, the changes in the applied stress were correlated to the changes observed in the ultrasonic waveforms, which were estimated using magnitude-squared coherence (MSC). In this paper we present an ultrasonic monitoring approach that uses a coda wave comparison (CWC) technique, which makes use of the highly sensitive diffuse (or coda) portion of a recorded ultrasonic waveform. In contrast, ultrasonic waves propagate through the thickness of a member and can thus detect internal changes. While conventional sensors such as strain gauges are accurate and reliable, they only allow for surface observations. ![]() Condition or health monitoring of concrete structures has experienced increasing interest over the last decade.
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