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Understanding the behaviour of graphene oxide in Portland cement paste

Ghazizadeh, S; Duffour, P; Skipper, N; Bai, Y; (2018) Understanding the behaviour of graphene oxide in Portland cement paste. Cement and Concrete Research , 111 pp. 169-182. 10.1016/j.cemconres.2018.05.016. Green open access

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Abstract

This study reports on the effect of graphene oxide (GO) on the hydration of Portland cement (PC) and industrial clinker. GO accelerates PC hydration, whereas it temporarily retards that of clinker. This difference reflects a twofold behaviour of GO in cement pastes. Retardation is due to the interaction of GO with the surface of hydrating grains, while acceleration results from a seeding effect. Gypsum causes this difference. GO is shown to have little effect on the strength of hardened pastes, and this merely relates to the change of hydration degree, as opposed to reinforcing effect formerly assumed. Overall, GO is not particularly active as a nucleation surface, as it aggregates and behaves in a similar way to inert fillers (e.g. quartz). Polycarboxylate-ether copolymer could make GO an active seed in cement pastes, as it prevents GO from aggregating. Nevertheless, this was found to occur only in alite pastes but not PC pastes.

Type: Article
Title: Understanding the behaviour of graphene oxide in Portland cement paste
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cemconres.2018.05.016
Publisher version: https://doi.org/10.1016/j.cemconres.2018.05.016
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Graphene oxide; Portland cement; Alite; Polycarboxylate-ether copolymer; Hydration kinetics
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10049774
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