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dc.contributor.authorChaliasou, Napoleana-Anna
dc.contributor.authorHeath, Andrew
dc.contributor.authorPaine, Kevin
dc.contributor.authorCalabria-Holley, Juliana
dc.date.accessioned2019-10-30T01:10:26Z
dc.date.available2019-10-30T01:10:26Z
dc.date.issued2018-09-01
dc.identifier.citationChaliasou , N-A , Heath , A , Paine , K & Calabria-Holley , J 2018 , ' Chemical aspects related to using recycled geopolymers as aggregates ' , Advances in Cement Research , vol. 30 , no. 8 , 1700120 , pp. 361-370 . < http://10.1680/jadcr.17.00120 >
dc.identifier.issn0951-7197
dc.identifier.otherPURE: 17621958
dc.identifier.otherPURE UUID: a103a0fd-89fe-4f8f-b32e-9a8c7d4d60e3
dc.identifier.otherScopus: 85051463843
dc.identifier.otherORCID: /0000-0002-6173-0328/work/64003679
dc.identifier.urihttp://hdl.handle.net/2299/21819
dc.descriptionThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.description.abstractDespite extensive research into sustainability of geopolymers, end-of-life aspects have been largely overlooked. A recycling scenario is examined in this study. This requires an investigation of alkali leaching potential from a geopolymeric matrix. To study the feasibility of geopolymer cement (GPC) recycling, the migration of alkalis was evaluated for the first time on a microstructural level through energy dispersive X-ray (EDX) scanning electron microscopy (SEM) elemental mapping and leaching tests. Macroscale impacts were assessed through an investigation of Portland cement (PC) mortar properties affected by alkali concentration. Leaching tests indicated that alkalis immediately become available in aqueous environments, but the majority remain chemically or physically bound in the matrix. This type of leaching accelerates the initial setting of PC paste. Elemental mapping and EDX/SEM analysis showed a complex paste-aggregate interfacial transition zone. Exchange of calcium and sodium, revealed by the maps, resulted in the migration of sodium into the PC paste and the formation of additional calcium-silicon-based phases in the geopolymeric matrix. Strength values of mortars with 25% and 50% recycled aggregates (RA) showed negligible differences compared with the reference sample. Screening tests indicated a low potential for GPC RA inducing alkali-silica reaction. Transport of GPC RA alkalis and the underlying mechanisms were observed. This transport phenomenon was found to have minor effects on the properties of the PC mortar, indicating that recycling of geopolymers is a viable reuse practice.en
dc.format.extent10
dc.language.isoeng
dc.relation.ispartofAdvances in Cement Research
dc.subjectGeopolymers
dc.subjectLeaching
dc.subjectRecycled Material
dc.subjectMaterials Science(all)
dc.subjectChemistry(all)
dc.subjectBuilding and Construction
dc.subjectWaste Management and Disposal
dc.titleChemical aspects related to using recycled geopolymers as aggregatesen
dc.contributor.institutionDepartment of Engineering and Technology
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.description.statusPeer reviewed
dc.identifier.urlhttp://10.1680/jadcr.17.00120
rioxxterms.versionVoR
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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