Alkali-reduced Bauxite Residue as Novel SCM
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 migh...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Sciendo
2020-12-01
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| Series: | Nordic Concrete Research |
| Subjects: | |
| Online Access: | https://doi.org/10.2478/ncr-2020-0015 |
| _version_ | 1818755315919749120 |
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| author | Danner Tobias Sletnes Malin Justnes Harald |
| author_facet | Danner Tobias Sletnes Malin Justnes Harald |
| author_sort | Danner Tobias |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-18T05:37:12Z |
| format | Article |
| id | doaj.art-e49f639154934da884799c303d92fdfe |
| institution | Directory Open Access Journal |
| issn | 2545-2819 |
| language | English |
| last_indexed | 2024-12-18T05:37:12Z |
| publishDate | 2020-12-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Nordic Concrete Research |
| spelling | doaj.art-e49f639154934da884799c303d92fdfe2022-12-21T21:19:17ZengSciendoNordic Concrete Research2545-28192020-12-0163212010.2478/ncr-2020-0015Alkali-reduced Bauxite Residue as Novel SCMDanner Tobias0Sletnes Malin1Justnes Harald2Scientist, SINTEF Community, Høgskoleringen 7B, 7034TrondheimScientist, SINTEF Community, Høgskoleringen 7B, 7034TrondheimChief scientist, SINTEF Community, Høgskoleringen 7B, 7034TrondheimBauxite 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.https://doi.org/10.2478/ncr-2020-0015bauxite residuered mudpozzolancementacetic acidalkali reductionsodium acetate |
| spellingShingle | Danner Tobias Sletnes Malin Justnes Harald Alkali-reduced Bauxite Residue as Novel SCM Nordic Concrete Research bauxite residue red mud pozzolan cement acetic acid alkali reduction sodium acetate |
| title | Alkali-reduced Bauxite Residue as Novel SCM |
| title_full | Alkali-reduced Bauxite Residue as Novel SCM |
| title_fullStr | Alkali-reduced Bauxite Residue as Novel SCM |
| title_full_unstemmed | Alkali-reduced Bauxite Residue as Novel SCM |
| title_short | Alkali-reduced Bauxite Residue as Novel SCM |
| title_sort | alkali reduced bauxite residue as novel scm |
| topic | bauxite residue red mud pozzolan cement acetic acid alkali reduction sodium acetate |
| url | https://doi.org/10.2478/ncr-2020-0015 |
| work_keys_str_mv | AT dannertobias alkalireducedbauxiteresidueasnovelscm AT sletnesmalin alkalireducedbauxiteresidueasnovelscm AT justnesharald alkalireducedbauxiteresidueasnovelscm |