Ultrasonic monitoring of the setting of cement-based materials: Frequency dependence

Hong Jae Yim, Jae Hong Kim*, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The microstructure of cement-based materials evolves during cement hydration. The foundation of the microstructure is laid during the setting period of concrete. This study experimentally monitors the evolving microstructure network of very early-age cement paste during the setting period. The ultrasonic wave reflection method was applied to probe paste samples, which allows us to obtain the frequency dependence of mechanical impedance. The frequency dependence is due to the development of a pore network and hence inversely describes the initial setting of concrete. A total of 11 cement paste mixes were prepared a different water-to-cement ratios and with the use of various admixtures. Finally, the critical time of frequency-dependent impedance is compared with the initial setting time measured by a Vicat needle test, and the results are discussed with the length of pore path.

Original languageEnglish (US)
Pages (from-to)518-525
Number of pages8
JournalConstruction and Building Materials
Volume65
DOIs
StatePublished - Aug 29 2014

Keywords

  • Hydration
  • Microstructure
  • Porosity
  • Setting
  • Ultrasonic wave

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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