Fibers Enhancing New Mine Waste-Based Alkaline-Activated Cement for Dry Stacking Purposes

AbstractRecent disasters involving upstream raised tailings dams in Brazil have caused regulatory agencies to prohibit the construction of new upstream dams and demand the decommissioning of existing ones. As such, new alternatives are being sought to safely dispose of iron ore exploitation byproduc...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2024-07, Vol.36 (7)
Main Authors: Guedes, João Pedro Camelo, Wagner, Alexia Cindy, Carvalho, João Vítor de Azambuja, Daassi-Gli, Cocou Auxence Pierre, Scheuermann Filho, Hugo Carlos, Consoli, Nilo Cesar
Format: Article
Language:English
Subjects:
Compressive strength
Dams
Exploitation
Fibers
Iron compounds
Iron ores
Legislation
Mine wastes
Storage facilities
Tailings
Technical Papers
Upstream
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Summary:AbstractRecent disasters involving upstream raised tailings dams in Brazil have caused regulatory agencies to prohibit the construction of new upstream dams and demand the decommissioning of existing ones. As such, new alternatives are being sought to safely dispose of iron ore exploitation byproducts. The dry stacking of filtered tailings is an option to diminish the risks associated with tailings storage facilities and cope with new legislation. Accordingly, this paper studies new solutions for enhancing the performance of tailings for dry stacking purposes. The behavior of reinforced and nonreinforced iron ore tailings-alkaline-activated cement (AAC) blends was studied through unconfined compressive strength tests and conventional triaxial testing. The AAC is produced from the residues of iron ore exploitation (waste and tailings). The addition of fibers has enhanced the performance of cemented iron ore tailings with increased strength regardless of the fiber content and ductility. Also, reinforcement effectiveness values were greater than those reported for other cement agents, due to the lower stiffness of the cemented matrix from AAC compared with others. A comparative analysis between using only AAC and ACC plus 0.5% of fibers within the η/Biv framework was proposed. The dosage curves for the same qu value yielded an AAC=20.80% for AAC only and AAC=3.80% when using 0.5% of fibers. Therefore, using fibers can collaborate with the feasibility of using a new waste-based AAC to construct dry stacking facilities.
ISSN:0899-1561
1943-5533
DOI:10.1061/JMCEE7.MTENG-17386