- Title
- Rheology of alkali-activated blended binder mixtures
- Creator
- Tekle, Biruk; Hertwig, Ludwig; Holschemacher, Klaus
- Date
- 2021
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/188936
- Identifier
- vital:17350
- Identifier
-
https://doi.org/10.3390/ma14185405
- Identifier
- ISSN:1996-1944
- Abstract
- Alkali-activated cement (AAC) is an alternative cement that has been increasingly studied over the past decades mainly because of its environmental benefits. However, most studies are on heat-cured AACs and are focused on mechanical properties. There is a lack of research on the fresh properties of ambient-cured AAC systems. This study investigates the rheological properties of ambient-temperature-cured alkali-activated blended binder mixtures activated with sodium silicate and sodium hydroxide solutions. The influence of binder amount, alkaline solid to binder ratio (AS/B), sodium silicate to sodium hydroxide solids ratio (SS/SH), and total water content to total solid (from the binding materials) ratio (TW/TS) on the rheological properties are investigated. The effect of borax as an admixture and silica fume as a replacement for fly ash is also investigated. The results showed that both the yield stress and plastic viscosity are mainly affected by the binder content and TW/TS ratio decreasing with the increase of each parameter. The yield stress increased with the increase of the SS/SH ratio. Borax significantly reduced the yield stress, while silica fume’s effect was dependent on its dosage.
- Publisher
- MDPI AG
- Relation
- Materials Vol. 14, no. 18 (2021), p. 5405
- Rights
- All metadata describing materials held in, or linked to, the repository is freely available under a CC0 licence
- Rights
- https://creativecommons.org/licenses/by/4.0/
- Rights
- Copyright authors
- Rights
- Open Access
- Subject
- 3-D printers; Admixtures; Alkali-activated cement; Behavior; Binders (materials); Borax; Carbon dioxide; Caustic soda; Cement; Concrete mixing; Fly ash; Mechanical properties; Moisture content; plastic viscosity; Rheological properties; Rheology; Shear stress; Silica fume; Silicon dioxide; Sodium; Sodium hydroxide; Sodium silicates; Thixotropy; Viscosity; Yield strength; Yield stress; 34 Chemical Sciences; 40 Engineering
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