Effect of nanosilica-based activators on the performance of an alkali-activated fly ash binder
By E. Rodríguez, S. A. Bernal, J. Provis, Jordi Payá, J. Monzó, M. Borrachero. 2013
208 citations recorded by the source corpus.
Abstract This paper assesses the effect of the use of an alternative activator based on nanosilica/MOH (M = K + or Na + ) blended solutions on the performance of alkali-activated fly ash binders. Binders produced with commercial silicate activators display a greater degree of reaction, associated with increased contents of geopolymer gel; however, mortars produced with the alternative nanosilica-based activators exhibited lower water demand and reduced permeability, independent of the alkali cation used. Na-based activators promote higher compressive strength compared with K-based activators, along with a refined pore structure, although K-activated samples exhibit reduced water demand. Zeolite type products are the major crystalline phases formed within these binders. A wider range of zeolites is formed when using commercial silicate solutions compared with the alternative activators. These results suggest that there are variations in the availability of Si in the system, and consequently in the alkalinity, depending on the silicate source in the activator, which is important in determining the nanostructure of the geopolymer gel.
Subfields: Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/4944a341730f269a5cc006ae60b249de54aa54f1
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In Civil and Structural Engineering
In Materials Chemistry
Citations in the corpus
- Effects of nano-silica on the strength development of geopolymer cured at room temperature (2015, background): “8, formation of sodium aluminosilicate gel was noticed which was also found by other researchers [19,23,26].”
- Effects SiO2/Na2O molar ratio on mechanical properties and the microstructure of nano-SiO2 metakaolin-based geopolymers (2014, background): “found that geopolymer motors produced using alternative nano-SiO2-based activators exhibited similar or better mechanical performance than those produced using conventional activators [15].”
- Sulfuric acid resistance of blended ash geopolymer concrete (2013, background): “A sodalite and natrolite were also identified which were the reaction products of geopolymerisation and represent the zeolite precursor of BAG concrete [20,26,27].”
- Production of sodium silicate powder from waste glass cullet for alkali activation of alternative binders (2019, background): “Attempts to find ways of reducing the cost and environmental impact of activators have mainly focused on hydrothermal processes to produce silicate solutions from by-products such as condensed silica fume [13-14] and rice husk ash [15-18].”
- Beneficial role of nanosilica in cement based materials – A review (2013, background): “It has also been found that nanosilica based activators for alkali-activated fly ash binder possesses better performances in terms of reduced porosity and compact microstructure [62].”