Phase evolution of C-(N)-A-S-H/N-A-S-H gel blends investigated via alkali-activation of synthetic calcium aluminosilicate precursors
By Brant Walkley, Rackel San Nicolas, M. Sani, Gregory J Rees, J. Hanna, J. V. van Deventer, J. Provis. 2016
473 citations recorded by the source corpus.
Stoichiometrically-controlled alkali-activated pastes containing calcium-(sodium) aluminosilicate hydrate (C-(N)-A-S-H) and sodium aluminosilicate hydrate (N-A-S-H) gels are produced by alkali-activation of high-purity synthetic calcium aluminosilicate powders. These powders are chemically comparable to the glass in granulated blast furnace slag, but without interference from minor constituents. The physiochemical characteristics of these gels depend on precursor chemical composition. Increased Ca content of the precursor promotes formation of low-Al, high-Ca C-(N)-A-S-H with lower mean chain length as determined by quantification of solid state nuclear magnetic resonance spectra, and less formation of calcium carboaluminate ‘Alumino-ferrite mono’ (AFm) phases. Increased Al content promotes Al inclusion and reduced crosslinking within C-(N)-A-S-H, increased formation of calcium carboaluminate AFm phases, and formation of an additional N-A-S-H gel. Small changes in precursor composition can induce significant changes in phase evolution, nanostructure and physical properties, providing a novel route to understand microstructural development in alkali-activated binders and address key related durability issues.
Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/150c466c956f00110434ba553ed95becc830a063
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Citations in the corpus
- Application of alkali-activated materials for water and wastewater treatment: a review (2019, background): “H gel), on the other hand, consists of cross-linked and non-cross linked structures resembling tobermorite (Bernal et al. 2014a; Myers et al. 2013, 2014; Walkley et al. 2016).”
- Apply 29Si, 27Al MAS NMR and selective dissolution in identifying the reaction degree of alkali activated slag-fly ash composites (2017, methodology): “It is commonly agreed that this site mainly refers to the end of chain silicate tetrahedrals within the newly formed C-(A)-S-H type gels [37].”