Indeed, hardened concrete (sound or damaged) exhibits a smooth curve with a slightly increasing trend for phase velocity, especially for the low frequency range [ 9 , 17 ], while the few experimental results as well as simulations concerning liquid matrix (fresh concrete) imply an opposite trend and showcase much stronger dispersion exhibiting even “resonant peaks” of phase velocity and attenuation [ 8 , 10 ].
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Chasing the Bubble: Ultrasonic Dispersion and Attenuation from Cement with Superabsorbent Polymers to Shampoo.
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