Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

Riccardo Maddalena, Kefei Li, Philip A. Chater, Stefan Michalik, Andrea Hamilton

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We present new results on solid (monolithic) synthetic C-S-H made at room temperature from easily obtainable calcium sources (calcium oxide, calcium hydroxide) and nanosilica (w/s = 2) with a 2 minute mixing time. Using synchrotron X-ray diffraction combined with TGA/DSC, 29Si NMR and synchrotron pair distribution function (PDF) data we show that the solid C-S-H is crystallographically similar to the more conventionally made synthetic C-S-H slurry. We show that C-S-H is present after 1 day curing (C/S = 0.81) and no X-ray visible portlandite is present from day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.
Original languageEnglish
Pages (from-to)554-565
Number of pages12
JournalConstruction and Building Materials
Early online date23 Jul 2019
Publication statusPublished - 30 Oct 2019


  • calcium-silicate-hydrate (C-S-H)
  • characterization
  • thermal analysis
  • X-ray diffraction


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