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

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

doi:10.1016/j.conbuildmat.2019.06.024

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

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

Civil And Environmental Engineering

Research output: Contribution to journal › Article

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.

Language	English
Pages	554-565
Number of pages	12
Journal	Construction and Building Materials
Volume	223
Early online date	23 Jul 2019
DOIs	10.1016/j.conbuildmat.2019.06.024
Publication status	Published - 30 Oct 2019

Fingerprint

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, R., Li, K., Chater, P. A., Michalik, S., & Hamilton, A. (2019). Direct synthesis of a solid calcium-silicate-hydrate (C-S-H). Construction and Building Materials, 223, 554-565. https://doi.org/10.1016/j.conbuildmat.2019.06.024

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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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.",

keywords = "calcium-silicate-hydrate (C-S-H), characterization, thermal analysis, X-ray diffraction",

author = "Riccardo Maddalena and Kefei Li and Chater, {Philip A.} and Stefan Michalik and Andrea Hamilton",

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Maddalena, R, Li, K, Chater, PA, Michalik, S & Hamilton, A 2019, 'Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)' Construction and Building Materials, vol. 223, pp. 554-565. https://doi.org/10.1016/j.conbuildmat.2019.06.024

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 journal › Article

TY - JOUR

T1 - Direct synthesis of a solid calcium-silicate-hydrate (C-S-H)

AU - Maddalena, Riccardo

AU - Li, Kefei

AU - Chater, Philip A.

AU - Michalik, Stefan

AU - Hamilton, Andrea

PY - 2019/10/30

Y1 - 2019/10/30

N2 - 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.

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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KW - characterization

KW - thermal analysis

KW - X-ray diffraction

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