WebThe main objective of this research is to investigate the applicability of diffuse ultrasound to the evaluation of distributed micro-cracking damage in concrete. To simulate the micro-cracking damage, polypropylene fibers with very low mechanical characteristics were embedded in concrete specimens, using three different fiber amounts (0, 0.3 ... WebThe propagation and scattering of ultrasound in concrete is discussed. The heterogeneous composition of concrete causes the ultrasound to scatter considerably. In the limit of many scattering events, the ultrasonic energy density in circular cylinders of concrete is shown to evolve in accordance with a one-dimensional diffusion equation. …
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WebFeb 1, 2024 · Finally, correlations between concrete thermal damage, ITZ characteristics and diffusivity are discussed . 2. Diffuse ultrasound for NDE of concrete2.1. Multiple scattering and diffusion of ultrasonic waves. In the case of heterogeneous materials, the “wave-matter” interaction is governed by both impedance contrasts and wave frequency. WebNov 1, 2001 · A simple description of multiple-scattering and intrinsic attenuation of ultrasound in concrete is provided by the diffusion … frozen reparos
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WebThe propagation and scattering of ultrasound in concrete is discussed. The heterogeneous composition of concrete causes the ultrasound to scatter considerably. In the limit of … WebMar 13, 2024 · The typical c l (r i,j) values of ultrasound wave propagated in concrete are on the order of several thousand meters per second; thus, stress variations and perturbations in our concrete beam only slightly change the c l ... Turner J. Ultrasound diffusion for crack depth determination in concrete. J Acoust Soc Am 2004; 115: … WebOct 1, 2024 · The diffusion of ultrasound is dependent on the material characteristics, as well as the test configurations (e.g., frequency of waves [18,47], transducer spacing [21,22]) and environmental conditions [25,30]. ... Both the diffusivity and dissipation of ultrasound in concrete depend on the wave frequency for the frequency range between 200 and ... frozen rhymezone