Flocculation and sedimentation in suspensions using ultrasonic wave reflection

Chul Woo Chung, John S. Popovics, Leslie J. Struble

Research output: Contribution to journalArticle

Abstract

This work was undertaken to help understand and interpret the ultrasonic wave reflection response of Portland cement paste as it transforms from a fluid-like suspension to a solid in the first hours after mixing. A high impact polystyrene buffer (delay line) was used to measure small changes in the P- and S-wave reflection coefficients. Two materials were studied: a non-hydrating colloidal alumina suspension whose microstructure was manipulated between dispersed and flocculated states by adjusting the pH and a coarse silica suspension that readily sedimented. The S-wave reflection coefficient clearly distinguished between dispersed and flocculated states. Sedimentation of particles in dispersed suspensions was distinguished using the P-wave reflection coefficient. Based on these findings, the observed P- and S-wave responses from hydrating Portland cement paste are interpreted in terms of flocculation and sedimentation processes.

Original languageEnglish (US)
Pages (from-to)2944-2951
Number of pages8
JournalJournal of the Acoustical Society of America
Volume129
Issue number5
DOIs
StatePublished - May 1 2011

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

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