• Treffer 6 von 9
Zurück zur Trefferliste

Effects of particle volume fraction and size on polysaccharide stabilizing agents

  • Polysaccharides modify the rheological properties of cement based systems. Depending upon their chemistry, molecular architecture, and adsorption tendency, they have different modes of action. Some polysaccharides like diutan gum have strong effect on the fluid phase; others like starch strongly interact with particles. This paper presents effects of diutan gum and starches in presence of polycarboxylates. Rheometric investigations with varied particle volume fractions and increasing coarse aggregate diameters were conducted. The results show that starches have stronger influence on the rheology at high particle volume fractions than diutan gum. At lower particle volume fractions this trend is inverted. Experiments with aggregates sizes up to 16 mm (0.63 in.) indicate that stabilizing agent influences on the effects of aggregates on yield stress were small; however up to 1.0 mm (0.04 in.), a significant effect on the plastic viscosity could be observed, which levelled off at largerPolysaccharides modify the rheological properties of cement based systems. Depending upon their chemistry, molecular architecture, and adsorption tendency, they have different modes of action. Some polysaccharides like diutan gum have strong effect on the fluid phase; others like starch strongly interact with particles. This paper presents effects of diutan gum and starches in presence of polycarboxylates. Rheometric investigations with varied particle volume fractions and increasing coarse aggregate diameters were conducted. The results show that starches have stronger influence on the rheology at high particle volume fractions than diutan gum. At lower particle volume fractions this trend is inverted. Experiments with aggregates sizes up to 16 mm (0.63 in.) indicate that stabilizing agent influences on the effects of aggregates on yield stress were small; however up to 1.0 mm (0.04 in.), a significant effect on the plastic viscosity could be observed, which levelled off at larger diameters.zeige mehrzeige weniger

Volltext Dateien herunterladen

  • ACI Superplasticizers 39 - 52.pdf
    eng
  • Superplasticizers and other chemical admixtures in concrete - Titelblatt.pdf
    eng

Metadaten exportieren

Weitere Dienste

Teilen auf Twitter Suche bei Google Scholar
Metadaten
Autoren/innen:Wolfram Schmidt, Sarah Leinitz, Hans-Carsten Kühne
Persönliche Herausgeber/innen:V. M. Malhotra, P. R. Gupta, T. C. Holland
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):11th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
Jahr der Erstveröffentlichung:2015
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.4 Baustofftechnologie
Herausgeber (Institution):ACI
Erste Seite:SP-302-03, 39
Letzte Seite:52
DDC-Klassifikation:Naturwissenschaften und Mathematik / Chemie / Analytische Chemie
Freie Schlagwörter:Diutan gum; Polycarboxylate ether; Polysaccharides; Starch; Volume fraction
Themenfelder/Aktivitätsfelder der BAM:Analytical Sciences
Veranstaltung:11th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete
Veranstaltungsort:Ottawa, Canada
Beginndatum der Veranstaltung:12.07.2015
Enddatum der Veranstaltung:15.07.2015
ISBN:9781942727224
Verfügbarkeit des Volltexts:Volltext-PDF im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.07.2016
Referierte Publikation:Nein