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

Lauren Gomez-Zamorano, Magdalena Balonis, Bartu Erdemli, Narayanan Neithalath, Gaurav Sant

Research output: Contribution to journalArticle

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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 energy-dispersive X-ray microanalysis (SEM-EDS), and X-ray diffraction (XRD). The solubility products (KS 0) of the gels were established at 25°C and 50°C. Self-consistent 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.

LanguageEnglish (US)
JournalJournal of the American Ceramic Society
DOIs
StateAccepted/In press - 2017

Fingerprint

solubility
Gels
gel
Solubility
Aluminosilicates
aluminosilicate
Hydrates
Sodium
Chemical analysis
scanning electron microscopy
sodium
Silicic Acid
Coal Ash
Calcium silicate
Scanning electron microscopy
Microanalysis
Alkalies
slag
Reaction products
Fly ash

Keywords

  • Calcium silicate hydrate
  • Cements
  • Geopolymers
  • Solubility
  • Thermodynamics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

C-(N)-S-H and N-A-S-H gels : Compositions and solubility data at 25°C and 50°C. / Gomez-Zamorano, Lauren; Balonis, Magdalena; Erdemli, Bartu; Neithalath, Narayanan; Sant, Gaurav.

In: Journal of the American Ceramic Society, 2017.

Research output: Contribution to journalArticle

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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 energy-dispersive X-ray microanalysis (SEM-EDS), and X-ray diffraction (XRD). The solubility products (KS 0) of the gels were established at 25°C and 50°C. Self-consistent 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.",
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