Application of ultrasonic P-wave reflection to measure development of early-age cement-paste properties

Chul Woo Chung, Prannoy Suraneni, John S. Popovics, Leslie J. Struble, W. Jason Weiss

Research output: Contribution to journalArticle

Abstract

Ultrasonic wave reflection (UWR), well established for the study of stiffening and strength development of cement-based materials, normally uses shear waves (S-waves) because they are sensitive to microstructural development. This study demonstrates possible application of UWR with longitudinal waves (P-waves) using a low impedance buffer for investigating stiffening in hydrating cement paste. The P-wave reflection coefficient was seen to increase modestly as hydration progressed. Also, the P-wave reflection coefficient showed higher values for pastes with lower water to cement ratios, which are primarily attributed to the higher density of low w/c pastes, and similar effects with addition of fly ash and entrained air. Partial debonding between paste and buffer was observed in most pastes at a time that coincided with final set as measured using S-waves; and the debonding appears to be associated with the development of pore water under-pressure that occurs after solidification (due to chemical shrinkage).

Original languageEnglish (US)
Pages (from-to)987-997
Number of pages11
JournalMaterials and Structures/Materiaux et Constructions
Volume46
Issue number6
DOIs
StatePublished - Jun 1 2013

Keywords

  • Cement paste
  • Longitudinal wave
  • P-wave
  • Setting
  • Shrinkage
  • Ultrasonic wave reflection

ASJC Scopus subject areas

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

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