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

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

Research output: Contribution to journalArticle

Abstract

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.
LanguageEnglish
Pages554-565
Number of pages12
JournalConstruction and Building Materials
Volume223
Early online date23 Jul 2019
DOIs
Publication statusPublished - 30 Oct 2019

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Silicic Acid
Calcium silicate
Hydrates
Synchrotrons
Distribution functions
Calcium Hydroxide
Hydrated lime
Curing
Calcium
Nuclear magnetic resonance
X ray diffraction
X rays
calcium silicate
Temperature

Keywords

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

Cite this

Maddalena, Riccardo ; Li, Kefei ; Chater, Philip A. ; Michalik, Stefan ; Hamilton, Andrea. / Direct synthesis of a solid calcium-silicate-hydrate (C-S-H). In: Construction and Building Materials. 2019 ; Vol. 223. pp. 554-565.
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Direct synthesis of a solid calcium-silicate-hydrate (C-S-H). / Maddalena, Riccardo; Li, Kefei ; Chater, Philip A.; Michalik, Stefan; Hamilton, Andrea.

In: Construction and Building Materials, Vol. 223, 30.10.2019, p. 554-565.

Research output: Contribution to journalArticle

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AU - Maddalena, Riccardo

AU - Li, Kefei

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AU - Hamilton, Andrea

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AB - 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.

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