Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of low fractions of styrene/butyl acrylate polymer latexes on some properties of ordinary portland cement mortars
The influence of the chemical structure of styrene/butyl acrylate latexes on some properties of ordinary Portland cement mortars has been investigated for low fractions of polymer with respect to the amount of cement. The structural parameters that were varied included the presence of carboxylic surface charges, the nature of the surfactant system, the molecular weight of the non-ionic emulsifier, and the particle surface coverage. The first part of the study showed that sterically stabilised latexes remain colloidally and chemically stable for several hours in the cement interstitial medium. Moreover, no interaction could be shown between cement and latex components. Then, for a fraction of about 5wt.-% of polymer, no significant influence of the presence of the latex was observed on the end-use properties of the mortars. However, it clearly appears that the use of a fraction of anionic stabiliser is highly detrimental to the paste workability, whereas this latter property is improved by the presence of non-ionic surfactant due to steric repulsion forces. Finally, the microstructure analysis confirms that the particles are homogenously dispersed in the mineral matrix and that they remain smooth and spherical.
Influence of low fractions of styrene/butyl acrylate polymer latexes on some properties of ordinary portland cement mortars
The influence of the chemical structure of styrene/butyl acrylate latexes on some properties of ordinary Portland cement mortars has been investigated for low fractions of polymer with respect to the amount of cement. The structural parameters that were varied included the presence of carboxylic surface charges, the nature of the surfactant system, the molecular weight of the non-ionic emulsifier, and the particle surface coverage. The first part of the study showed that sterically stabilised latexes remain colloidally and chemically stable for several hours in the cement interstitial medium. Moreover, no interaction could be shown between cement and latex components. Then, for a fraction of about 5wt.-% of polymer, no significant influence of the presence of the latex was observed on the end-use properties of the mortars. However, it clearly appears that the use of a fraction of anionic stabiliser is highly detrimental to the paste workability, whereas this latter property is improved by the presence of non-ionic surfactant due to steric repulsion forces. Finally, the microstructure analysis confirms that the particles are homogenously dispersed in the mineral matrix and that they remain smooth and spherical.
Influence of low fractions of styrene/butyl acrylate polymer latexes on some properties of ordinary portland cement mortars
Boutti, Salima (Autor:in) / Urvoy, Marie (Autor:in) / Dubois-Brugger, Isabelle (Autor:in) / Graillat, Christian (Autor:in) / Bourgeat-Lami, Elodie (Autor:in) / Spitz, Roger (Autor:in)
Macromolecular Materials and Engineering ; 292 ; 33-45
2007
13 Seiten, 11 Bilder, 9 Tabellen, 15 Quellen
Aufsatz (Zeitschrift)
Englisch
Thermal activation of ordinary Portland cement-slag mortars
| British Library Online Contents | 2010
Crumpled highly filled poly(styrene-co-butyl acrylate)/clay hybrid latexes
| British Library Online Contents | 2013
Retardation effect of styrene-acrylate copolymer latexes on cement hydration
| British Library Online Contents | 2015
Retardation effect of styrene-acrylate copolymer latexes on cement hydration
| Online Contents | 2015