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Article: Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

TitleEffect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement
Authors
KeywordsAlkali-activated slag cement
GO nanosheets
LDHs
Microstructure
Reaction pathway
Issue Date2017
Citation
Construction and Building Materials, 2017, v. 132, p. 290-295 How to Cite?
AbstractDue 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.
Persistent Identifierhttp://hdl.handle.net/10722/341197
ISSN
2023 Impact Factor: 7.4
2023 SCImago Journal Rankings: 1.999
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhu, Xiao Hong-
dc.contributor.authorKang, Xiao Juan-
dc.contributor.authorYang, Kai-
dc.contributor.authorYang, Chang Hui-
dc.date.accessioned2024-03-13T08:40:56Z-
dc.date.available2024-03-13T08:40:56Z-
dc.date.issued2017-
dc.identifier.citationConstruction and Building Materials, 2017, v. 132, p. 290-295-
dc.identifier.issn0950-0618-
dc.identifier.urihttp://hdl.handle.net/10722/341197-
dc.description.abstractDue 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.-
dc.languageeng-
dc.relation.ispartofConstruction and Building Materials-
dc.subjectAlkali-activated slag cement-
dc.subjectGO nanosheets-
dc.subjectLDHs-
dc.subjectMicrostructure-
dc.subjectReaction pathway-
dc.titleEffect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.conbuildmat.2016.11.059-
dc.identifier.scopuseid_2-s2.0-85004097285-
dc.identifier.volume132-
dc.identifier.spage290-
dc.identifier.epage295-
dc.identifier.isiWOS:000393002700027-

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