Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of two dispersants on the rheological behavior of kaolin and illite in concentrated calcium hydroxide dispersions
AbstractThe influence of an alkylammonium surfactant and a negatively charged grafted block copolymer (CTP) onto the threshold stress value of illite and kaolinite dispersions was investigated in a strongly alkaline environment.For both clay minerals, addition of hexadecyl trimethylammonium (HDMA) promotes the release of calcium ions. For kaolin KF, this release is linked at low HDMA/ kaolinite ratio with an increase of the threshold stress, and at high HDMA/kaolinite ratio with a decreasing viscosity of the dispersion. Low cationic additive concentrations coagulated the dispersions while at high additive content, repulsion between the surfactant counter ions on the particle surfaces stabilized the dispersion.In contrast, although addition of a comb-type copolymer with an anionic backbone (CTP) reduced viscosity of both dispersions, no calcium ion release was observed. This result indicated that CTP stabilized the dispersions by a steric mechanism.
Influence of two dispersants on the rheological behavior of kaolin and illite in concentrated calcium hydroxide dispersions
AbstractThe influence of an alkylammonium surfactant and a negatively charged grafted block copolymer (CTP) onto the threshold stress value of illite and kaolinite dispersions was investigated in a strongly alkaline environment.For both clay minerals, addition of hexadecyl trimethylammonium (HDMA) promotes the release of calcium ions. For kaolin KF, this release is linked at low HDMA/ kaolinite ratio with an increase of the threshold stress, and at high HDMA/kaolinite ratio with a decreasing viscosity of the dispersion. Low cationic additive concentrations coagulated the dispersions while at high additive content, repulsion between the surfactant counter ions on the particle surfaces stabilized the dispersion.In contrast, although addition of a comb-type copolymer with an anionic backbone (CTP) reduced viscosity of both dispersions, no calcium ion release was observed. This result indicated that CTP stabilized the dispersions by a steric mechanism.
Influence of two dispersants on the rheological behavior of kaolin and illite in concentrated calcium hydroxide dispersions
Konan, Koffi Leon (Autor:in) / Peyratout, Claire (Autor:in) / Cerbelaud, Manuella (Autor:in) / Smith, Agnes (Autor:in) / Bonnet, Jean-Pierre (Autor:in) / Jacquet, Alain (Autor:in)
Applied Clay Science ; 42 ; 252-257
14.01.2008
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Dispersants for Dual Binding System Kaolin - Calcium Aluminate Cement
| British Library Conference Proceedings | 2015