C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C

Gomez Zamorano, Lauren y Balonis, Magdalena y Erdemli, Bartu y Neithalath, Narayanan y Sant, Gaurav (2017) C-(N)-S-H and N-A-S-H gels: Compositions and solubility data at 25°C and 50°C. Journal of the American Ceramic Society, 100 (6). pp. 2700-2711. ISSN 00027820

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URL o página oficial: http://doi.org/10.1111/jace.14715

Resumen

Abstract Calcium silicate hydrates containing sodium [C–(N)–S–H], and sodium aluminosilicate hydrates [N–A–S–H] are the dominant reaction products that are formed following reaction between a solid aluminosilicate precursor (eg, slags, fly ash, metakaolin) and an alkaline activation agent (eg NaOH) in the presence of water. To gain insights into the thermochemical properties of such compounds, C–(N)– S–H and N–A–S–H gels were synthesized with compositions: 0.8≤Ca/Si≤1.2 for the former, and 0.25≤Al/Si≤0.50 (atomic units) for the latter. The gels were characterized using thermogravimetric analysis (TGA), scanning electron microscopy with energydispersive X-ray microanalysis (SEM-EDS), and X-ray diffraction (XRD). The solubility products (KS0) of the gels were established at 25°C and 50°C. Selfconsistent solubility data of this nature are key inputs required for calculation of mass and volume balances in alkali-activated binders (AABs), and to determine the impacts of the precursor chemistry on the hydrated phase distributions; in which, C–(N)–S–H and N–A–S–H compounds dominate the hydrated phase assemblages. KEYWORDS calcium silicate hydrate, cements, geopolymers, solubility, thermodynamics

Tipo de elemento: Article
Divisiones: Ingeniería Mecánica y Eléctrica
Usuario depositante: Editor Repositorio
Creadores:
CreadorEmailORCID
Gomez Zamorano, LaurenNO ESPECIFICADONO ESPECIFICADO
Balonis, MagdalenaNO ESPECIFICADONO ESPECIFICADO
Erdemli, BartuNO ESPECIFICADONO ESPECIFICADO
Neithalath, NarayananNO ESPECIFICADONO ESPECIFICADO
Sant, GauravNO ESPECIFICADONO ESPECIFICADO
Fecha del depósito: 24 Abr 2020 19:06
Última modificación: 24 Abr 2020 19:06
URI: http://eprints.uanl.mx/id/eprint/17682

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