Green Stabilization of Bauxite Tailings: Mechanical Study on Alkali-Activated Materials

AbstractThis study evaluates the alkali activation of a binary system composed of sugar cane bagasse ash and carbide lime as a green stabilization technique for bauxite tailings (BTs). To analyze the feasibility of this alternative binder as a stabilizer, mechanical tests were performed to measure t...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2021-11, Vol.33 (11)
Main Authors: Bruschi, Giovani Jordi, dos Santos, Carolina Pereira, Tonini de Araújo, Mariana, Ferrazzo, Suéllen Tonatto, Marques, Sérgio Filipe Veloso, Consoli, Nilo Cesar
Format: Article
Language:English
Subjects:
Bagasse
Bauxite
Bayer process
Binders (materials)
Building materials
Civil engineering
Evaluation
Mechanical properties
Mechanical tests
Porosity
Portland cements
Stabilization
Stiffness
Sugarcane
Tailings
Technical Note
Technical Notes
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Summary:AbstractThis study evaluates the alkali activation of a binary system composed of sugar cane bagasse ash and carbide lime as a green stabilization technique for bauxite tailings (BTs). To analyze the feasibility of this alternative binder as a stabilizer, mechanical tests were performed to measure the strength, stiffness, and durability of BT binder mixtures. As a control group, tailings were stabilized with high-initial-strength portland cement (Type III). The results show that the alternative binder is a suitable option to improve the mechanical behavior of bauxite tailings. The porosity/binder index (η/Biv) was an appropriate parameter for evaluating BT stabilization. Reduced porosity and increased binder content (decreased η/Biv) led to an improvement in the mechanical behavior of the studied mixtures.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0003949