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An investigation into the colloidal stability of graphene oxide nano-layers in alite paste

Ghazizadeh, S; Duffour, P; Skipper, NT; Billing, M; Bai, Y; (2017) An investigation into the colloidal stability of graphene oxide nano-layers in alite paste. Cement and Concrete Research , 99 pp. 116-128. 10.1016/j.cemconres.2017.05.011. Green open access

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Abstract

Recent studies have reported that graphene oxide (GO) is capable of enhancing the mechanical properties of hardened Portland cement (PC) pastes. The mechanisms proposed so far to explain this strengthening generally assume that GO is well dispersed in the pore solution of PC paste, serving as a reinforcing agent or nucleation-growth site during hydration. This paper investigates (i) the effect of GO on the hydration of alite, the main constituent of PC cement, using isothermal calorimetry and boundary nucleation-growth modelling, and (ii) the factors controlling the colloidal stability of GO in alite paste environment. Results indicate that GO accelerates the hydration of alite only marginally, and that GO is susceptible to aggregation in alite paste. This instability is due to (i) a pH-dependent interaction between GO and calcium cations in the pore solution of alite paste, and (ii) a significant reduction of GO functional groups at high pH.

Type: Article
Title: An investigation into the colloidal stability of graphene oxide nano-layers in alite paste
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.cemconres.2017.05.011
Publisher version: http://dx.doi.org/10.1016/j.cemconres.2017.05.011
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: Colloidal stability, Graphene oxide, Alite, Portland cement
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/1556415
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