Zhu, XH, Kang, XJ, Yang, K et al. (1 more author) (2017) Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement. Construction and Building Materials, 132. pp. 290-295. ISSN 0950-0618
Abstract
Due to its high aspect ratio and outstanding tensile strength, graphene oxide (GO) can dramatically reduce the brittleness of cement-based materials. In this paper, GO nanosheets were successfully synthesised using the modified Hummers’ method. Effects of the GO on the fluidity, mechanical properties of alkali-activated slag (AAS) mortars and the microstructure of the AAS pastes were studied. It is found that addition of the GO caused a significant reduction in fluidity and a slight decrease in the compressive strength of the hardened mortars. However, the GO improved the flexural strengths by 20% with a dosage of 0.01 wt% after 7 days. Large-scale layered double hydroxides (LDHs) were observed using SEM, the compositions of which were identified and EDS and XRD. A possible mechanism of the formation of LDHs in the GO-AAS system is proposed. Due to the Mg2+/Al3+ decomposed from the slag and the Al(OH)4− formed in the high pH condition in the GO-AAS system, the reaction pathway of LDHs can be regarded as aMg2++Al(OH)−4+(2a−2)OH−+xH2O+A−⇋MgaAl(OH)2+2aA⋅xH2O(s) This research provides a further understanding of the effect of graphene oxide which has a potential application of GO in AASC.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016 Elsevier Ltd. This is an author produced version of a paper published in Construction and Building Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | GO nanosheets; Alkali-activated slag cement; Microstructure; LDHs; Reaction pathway |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) > Institute for Resilient Infrastructure (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 07 Feb 2017 11:46 |
Last Modified: | 09 Dec 2017 01:40 |
Published Version: | https://doi.org/10.1016/j.conbuildmat.2016.11.059 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.conbuildmat.2016.11.059 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:111910 |