A quantitative analysis of dicalcium silicate synthesized via different sol-gel methods

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Abstract

In this paper, the synthesis of dicalcium silicate (C 2S) via sol-gel (acid-catalyzed) process including aqueous route, non-aqueous route, and the Pechini method is reported. The composition of C 2S (α, β, and γ) polymorphs, by-products, and amorphous content is established by employing QXRD (quantitative X-ray diffraction) studies. The attention has been focused to comprehend assay-amorphous relationships of C 2S yield. The intermediate dried gels have been investigated via thermal analysis to monitor changes in the gel structures and precursors at low temperatures. The synthetic parameters including calcination time and temperature, Ca/Si molar ratio and mode of cooling have been optimized to get pure β-C 2S with low amorphous content. The dependency of β → γ C 2S polymorphic transformation on mean crystallite size (D cryst) is studied. Overall, the Pechini method exhibits the most promising results for the purity and tuning of β-C 2S polymorph. Moreover, the non-aqueous and aqueous routes require calcining the dried gel at a temperature higher than 1200 ℃ due to the presence of CaO precursors as CaCO 3. The theoretical calculations of amorphous content have revealed that the change in the stoichiometry from 2.0 to 1.7 Ca/Si ratio is not a viable solution to improve the C 2S product yield.

Original languageEnglish
Article number110329
Number of pages12
JournalMaterials and Design
Volume213
DOIs
Publication statusPublished - 1 Jan 2022

Keywords

  • Aqueous route
  • Dicalcium silicate
  • Mean crystallite size
  • Non-aqueous route
  • Pechini method
  • Polymorphs
  • Sol–gel

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