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Bauxite Residue as Supplementary Cementitious Material – Efforts to Reduce the Amount of Soluble Sodium Cover

Bauxite Residue as Supplementary Cementitious Material – Efforts to Reduce the Amount of Soluble Sodium

By: Tobias Danner and  Harald Justnes  
Open Access
|Jul 2020

Abstract

This study investigates the feasibility of using bauxite residue (BR) as supplementary cementitious material (SCM) for the cement and concrete industry. It is shown from pastes of BR and calcium hydroxide, that BR is highly pozzolanic in nature. The early hydration of cement pastes with BR is accelerated while long-term strength is reduced probably due to the alkaline nature of BR. To be used as cement replacement material in concrete, attempts have been made to reduce the alkali content of BR, in particular to reduce the chance of alkali-aggregate reactions. Co-calcination of BR with kaolin or washing and cooking of BR with calcium hydroxide or calcium hydroxide and gypsum resulted in considerable reduction of alkali content; up to 75%. At the same time the reactivity of the BR was reduced but still being higher compared to fly ash already used in the cement industry.

DOI: https://doi.org/10.2478/ncr-2020-0001 | Journal eISSN: 2545-2819 | Journal ISSN: 0800-6377
Language: English
Page range: 1 - 20
Submitted on: Jan 30, 2020
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Accepted on: Apr 3, 2020
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Published on: Jul 9, 2020
In partnership with: Paradigm Publishing Services
Publication frequency: 2 issues per year

© 2020 Tobias Danner, Harald Justnes, published by Nordic Concrete Federation
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.