Comment on “Attenuation and dispersion of sound in dilute suspensions of spherical particles” [J. Acoust. Soc. Am. 108(1), 126–146 (2000)]

Shukla, Shiva Kant; Elvira, Luis

doi:10.1121/1.4916967

Cited by 2 publications

(2 citation statements)

References 14 publications

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“…The seemingly "irregular" phase velocity (which reaches values close to 9000 m/s) vs. frequency curves are attributed to the interaction of the waves with the cavities formed by the air bubbles. This is in accordance with studies in gels and suspensions where phase velocity exhibits a strong attenuation and phase velocity peaks at wavelengths much longer than the air bubble size [14].…”

Section: Resultssupporting

confidence: 92%

Characterization of fresh cementitious media through wave dispersion

Iliopoulos

Aggelis²

2019

Sustainable Construction Materials and Technologies (SCMT)

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Ultrasonics have been widely used for testing concrete in the hardened and fresh state. Serious advances have been made in the field throughout the last three decades in terms of wave analyses, hydration modeling while materials with various additives have been tested. However, from the ultrasonics point of view, most of the information is provided mainly by the traditional parameter of "pulse velocity" based on the initial waveform threshold crossing and secondary by the amplitude of the pulse. These features are very powerful, but their characterization capacity diminishes with the increasing heterogeneity of the material. Detailed measurements of phase velocity and attenuation as a function of frequency provide extended information since instead of a single pulse velocity value, they provide a whole curve of wave velocity or attenuation over the frequency range of interest. This allows to observe resonant peaks owing to the microstructure giving better possibilities for characterization and allowing the monitoring of the changes of the curve as the material evolves from viscous to solid. In this paper a summary of wave dispersion and attenuation measurements in cement paste and mortar is presented, supported by theoretical formulations considering the microstructure while challenges and potential improvements are discussed.

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Section: Resultssupporting

confidence: 92%

Characterization of fresh cementitious media through wave dispersion

Iliopoulos

Aggelis²

2019

Sustainable Construction Materials and Technologies (SCMT)

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“…Nevertheless, the matrix hardens, imposing stiff boundary conditions to the bubbles, restraining therefore, their scattering contribution. Herein, it is mentioned that, indeed, cavities in liquid matrix produce strong resonant peaks in phase velocity (even higher than 10 km/s), as seen experimentally and predicted theoretically [ 16 , 24 , 25 ]. These peaks are (almost) eliminated when the matrix obtains a minimum level of stiffness [ 8 ].…”

Section: Ultrasonic Dispersion Resultsmentioning

confidence: 66%

Chasing the Bubble: Ultrasonic Dispersion and Attenuation from Cement with Superabsorbent Polymers to Shampoo

et al. 2020

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This study aims to experimentally investigate the ultrasonic behavior of fresh cement focusing on the contribution of the entrapped air bubbles. Frequency dispersion and attenuation carry delicate information that is not possible to gather by traditional ultrasonic pulse velocity. This is measured by simple indicators that quantify the frequency dependence of propagation velocity of longitudinal waves through fresh cementitious media. It seems that dispersion shows much stronger sensitivity to the microstructural processes, since the presence of superabsorbent polymers in mortar induces a large difference in dispersion parameters when compared to reference cement mortar, while only marginal difference in threshold-based pulse velocity. To reach this aim, references are taken from, and comparisons are made to other liquids in order first in order to validate the reliability of the methodology and to better understand the contribution of the cavities in the obtained dispersion and attenuation curves. Ultrasonic dispersion assessment of cementitious media has the potential to bring a lot of information on the microstructure of materials, as well as the ongoing processes.

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Comment on “Attenuation and dispersion of sound in dilute suspensions of spherical particles” [J. Acoust. Soc. Am. 108(1), 126–146 (2000)]

Cited by 2 publications

References 14 publications

Characterization of fresh cementitious media through wave dispersion

Characterization of fresh cementitious media through wave dispersion

Chasing the Bubble: Ultrasonic Dispersion and Attenuation from Cement with Superabsorbent Polymers to Shampoo

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