Polyelectrolyte effects on the rheological properties of concentrated cement suspensions

Jennifer A Lewis, Hiro Matsuyama, Glen Kirby, Sherry Morissette, J. Francis Young

Research output: Contribution to journalArticlepeer-review

Abstract

Polyelectrolyte species, known as superplasticizers, dramatically affect the rheological properties of dense cement suspensions. We have studied the influence of sulfonated naphthalene formaldehyde condensate (SNF) and carboxylated acrylic ester (CAE) grafted copolymers of varying molecular architecture on the surface (e.g., adsorption behavior and zeta potential) and rheological properties of concentrated cement suspensions of white portland cement and two model compounds, B-Ca 2SiO 4 and Γ-Ca 2SiO 4. The adsorption of SNF species was strongly dependent on cement chemistry, whereas CAE species exhibited little sensitivity. The respective critical concentrations (Φ*) in suspension required to promote the transition from strongly shear thinning to Newtonian flow (flocculated → stable) behavior were determined from stress viscometry and yield stress measurements. Theoretical analysis of interparticle interactions suggested that only colloidal particles in the size range of ≤1 μm are fully stabilized by adsorbed polyelectrolyte species. Our observations provide guidelines for tailoring the molecular architecture and functionality of superplasticizers for optimal performance.

Original languageEnglish (US)
Pages (from-to)1905-1913
Number of pages9
JournalJournal of the American Ceramic Society
Volume83
Issue number8
StatePublished - Aug 1 2000

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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