Abstract
Acoustophoresis has been used to study the evolution of the surface potential of hydrating cement suspensions because it is potentially capable of measuring zeta potentials of cement suspensions at concentrations high enough not to modify ion/particle interactions, which is not the case for most other methods. Measurements were performed using cement with and without addition of high-range water reducing admixture (HRWRA). In this paper it will be shown that quantitative determination of the potential is rendered difficult by the large size of cement particles as well as by ongoing hydration reactions. Other benefits of the technique will be discussed.
Résumé
L'acoustophorèse a été utilisée pour étudier l'évolution du potentiel de surface de suspensions de pâtes de ciment, durant leur hydratation, parce que cette technique est potentiellement capable de mesurer le potentiel zêta d'une suspension de ciment à des concentrations suffisamment élevées pour ne pas modifier les interactions ion/particule, ce qui n'est pas le cas de la plupart des autres méthodes. Les mesures ont été faites, en présence ou non d'adjuvants à pouvoir réducteur d'eau élevé. Dans cet article, on démontre aussi que la détermination quantitative du potentiel est rendue difficile à cause de la large taille des particules ainsi que des réactions d'hydratation. D'autres avantages de cette technique sont également discutés.
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Editorial Note Dr. Chiara F. Ferraris is a RILEM Senior Member and works at NIST, a RILEM Titular Member, The Swiss Federal Institute of Technology (EPFL) is a RILEM Titular Member.
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Flatt, R.J., Ferraris, C.F. Acoustophoretic characterization of cement suspensions. Mat. Struct. 35, 541–549 (2002). https://doi.org/10.1007/BF02483122
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DOI: https://doi.org/10.1007/BF02483122