Alkali-reduced Bauxite Residue as Novel SCM
dc.contributor.author | Danner, Tobias | |
dc.contributor.author | Sletnes, Malin | |
dc.contributor.author | Justnes, Harald | |
dc.date.accessioned | 2021-01-25T09:50:28Z | |
dc.date.available | 2021-01-25T09:50:28Z | |
dc.date.issued | 2020 | |
dc.identifier.issn | 0800-6377 | |
dc.identifier.uri | https://hdl.handle.net/11250/2724477 | |
dc.description.abstract | Bauxite residue is a major waste stream available in large volumes globally that can cause risks to the surrounding environment (e.g. ecotoxicity) when disposed and stored by conventional methods. There is yet no large-scale application and the utilization as supplementary cementitious material might be the best way to re-use bauxite residue. The main obstacle for the utilization of bauxite residue in the construction industry is the high alkalinity. This paper presents first results of a study on alkali reduction of bauxite residue by acetic acid treatment and the potential application of this alkali reduced bauxite residue as pozzolan in cementitious binders. A process of alkali reduction is presented that can help solving waste management problems of alumina refineries by transforming bauxite residue to a less hazardous waste, while producing a reactive pozzolan and Na-acetate that can find application in the construction and infrastructure market. 90% alkalinity reduction of bauxite residue could be achieved by simply washing with diluted acetic acid. Alkali-reduced bauxite residue showed good pozzolanic reactivity regarding portlandite consumption, bound water and 28-day compressive strength of mortars with 20% replacement of OPC. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | Sciendo | en_US |
dc.rights | CC BY 3.0 | * |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/3.0/ | * |
dc.subject | Bauxite residue | en_US |
dc.subject | Red mud | en_US |
dc.subject | Pozzolan Cement | en_US |
dc.subject | Acetic acid | en_US |
dc.subject | Alkali reduction | en_US |
dc.subject | Sodium acetate | en_US |
dc.title | Alkali-reduced Bauxite Residue as Novel SCM | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | © 2020 The authors | en_US |
dc.subject.nsi | VDP::Teknologi: 500 | en_US |
dc.source.volume | 63 | en_US |
dc.source.journal | Nordic Concrete Research | en_US |
dc.source.issue | 2 | en_US |
dc.identifier.doi | 10.2478/ncr-2020-0015 | |
dc.identifier.cristin | 1846664 | |
dc.relation.project | Norges forskningsråd: 269767 | en_US |
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