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

Maddalena, Riccardo ORCID: https://orcid.org/0000-0001-6251-3782, 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:	Publisher
Date of First Compliant Deposit:	24 October 2019
Date of Acceptance:	3 June 2019
Last Modified:	04 May 2023 23:19
URI:	https://orca.cardiff.ac.uk/id/eprint/126282

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