Characterization of entrained air voids using scattered ultrasound

W. Punurai, L. J. Jacobs, K. E. Kurtis, J. Jarzynski, J. Qu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The passage of ultrasound waves through highly heterogeneous media (e.g. hardened cement pastes that contain entrained air voids for protection against damage during freeze-thaw cycles) leads to significant loss of wave energy and an apparent attenuation of ultrasonic signal emerging from the heterogeneous zone. The size of this attenuation depends on the correlation properties of the medium (e.g. size and volume fraction of air voids) and the wavelength and frequency content of the incident waves. An estimated of the effect can be obtained using independent scattering theory under dilute concentration assumption. The resulting attenuation characteristics are illustrated numerically. These results are discussed in comparison with experimental data of longitudinal wave attenuation in the hardened cement paste containing a low volume fraction of entrained air voids of less than 10% for a large frequency range of 500 kHz-5MHz.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 25B
Pages1335-1342
Number of pages8
DOIs
StatePublished - 6 Mar 2006
EventReview of Progress in Quantitative Nondestructive - Brunswick, ME, United States
Duration: 31 Jul 20055 Aug 2005

Publication series

NameAIP Conference Proceedings
Volume820 II
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceReview of Progress in Quantitative Nondestructive
Country/TerritoryUnited States
CityBrunswick, ME
Period31/07/055/08/05

Keywords

  • Cement-based materials
  • Entrained air voids
  • Ultrasonic scattering attenuation

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