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Author(s): (Scientist, SINTEF Community , Høgskoleringen 7B, 7034 Trondheim)
(Scientist, SINTEF Community , Høgskoleringen 7B, 7034 Trondheim)
(Chief scientist, SINTEF Community , Høgskoleringen 7B, 7034 Trondheim)
Medium: journal article
Language(s): English
Published in: Nordic Concrete Research, , n. 2, v. 63
Page(s): 1-20
DOI: 10.2478/ncr-2020-0015
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.

Structurae cannot make the full text of this publication available at this time. The full text can be accessed through the publisher via the DOI: 10.2478/ncr-2020-0015.
  • About this
    data sheet
  • Reference-ID
    10705830
  • Published on:
    19/02/2023
  • Last updated on:
    19/02/2023
 
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