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

Maddalena, Riccardo, Hamilton, Andrea, Li, Kefei, Chater, Philip and Michalik, Stefan 2019. Direct synthesis of a solid calcium-silicate-hydrate (C-S-H). Construction and Building Materials 223 , pp. 554-565. 10.1016/j.conbuildmat.2019.06.024

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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 at day 3. PDF data shows that the ordered domain size is 2.5 – 4.5 nm, depending on the fit chosen.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Publisher: Elsevier
ISSN: 0950-0618
Funders: EPSRC
Related URLs:
Date of First Compliant Deposit: 24 October 2019
Date of Acceptance: 3 June 2019
Last Modified: 28 Oct 2019 13:00
URI: http://orca.cf.ac.uk/id/eprint/126282

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