Influence of Polypropylene Fiber-Reinforcement on the Mechanical Behavior of Gold Ore Tailings through Direct Shear Tests

Sotomayor, Juan Manuel Girao; Alelvan, Giovanna Monique; Casagrande, Michéle Dal Toé

doi:10.1061/(asce)mt.1943-5533.0003878

Cited by 9 publications

(6 citation statements)

References 30 publications

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“…However, microstructural analysis is required for a comprehensive understanding of the behavior of composites in tailings. Since tailings materials have not undergone the typical soil formation process, classical soil mechanics may not accurately represent their behavior [34][35][36][37].…”

Section: Identification Of Ksfsmentioning

confidence: 99%

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Key Success Factors for the Practical Application of New Geomaterials

Alelvan,

Santos,

Pierozan

et al. 2023

Sustainability

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Geomaterials comprise naturally formed materials through geological processes, such as soils and rocks, or artificially processed materials, including mineral waste and geosynthetics. These materials find extensive use in geotechnical structures, such as slopes, dams, and pavements, among others. However, two issues commonly arise in earthworks: the materials available in the region do not meet the minimum engineering requirements, resulting in high transportation costs, and the exploitation of new deposits increases environmental impacts. Consequently, there is a need to develop stabilization and reinforcement techniques aimed at creating new geomaterials (NGs) to expand the range of local material applications. In this context, the present study evaluates the key success factors (KSFs) related to the application of NGs in geotechnical structures. The Delphi method was employed through a structured questionnaire developed after an extensive literature review. Brazilian experts from the public, private, and academic sectors were selected to identify the obstacles and potential pathways for the practical application of NGs. The outcomes of the study indicated that the lack of standardization, the complex behavior of geomaterials under varying conditions, as well as technical and economic limitations serve as barriers impeding the widespread adoption of NGs. Finally, a roadmap proposal was devised, encompassing a series of actions intended to facilitate the broader utilization of NGs.

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Section: Identification Of Ksfsmentioning

confidence: 99%

“…Applications include structural use under freeze-thaw cycling, transportation subgrades, and mining tailings [37,71,72].…”

Section: Examples Include Polypropylene and Polyester Fibersmentioning

confidence: 99%

Key Success Factors for the Practical Application of New Geomaterials

Alelvan,

Santos,

Pierozan

et al. 2023

Sustainability

Self Cite

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“…The second composite is formed by the tailings matrix, the same polymeric solutions content, and polypropylene fibers (GT_PF). The reinforcement was added in a content of 0.5% by matrix mass since this amount has been satisfactorily used in several studies in the literature [13,17,[32][33][34]. The mixture was made in a systematic process, alternating layers of tailings and fibers, and pulverizing the polymer solution, after which the mixture was homogenized until uniformity was visually observed.…”

Section: Composites Assemblymentioning

confidence: 99%

“…The fundamental improvement technique is compaction, which allows an increase in resistance by generating a more stable structure. This may not be sufficient, and additional processes such as stabilization and reinforcement may be required [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Proposal of New Construction Material: Polymer-Stabilized Gold Ore Tailings Composite

et al. 2022

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Recent events involving the rupture of tailings dams in Brazil have motivated the search for alternatives to incorporate the material into the production chain. At the same time, the consumption of raw materials by the civil construction sector is high, requiring the incorporation of alternative materials to achieve sustainable development. Thus, this paper proposes a new construction material based on the mechanical and microstructural behavior of polymer-stabilized and fiber-reinforced gold ore tailings composites. Unconfined Compressive Strength tests were performed on different polymer contents (6% and 9%), dry unit weights (1.7 g/cm³ and 1.8 g/cm³), and curing periods (7 and 28 days), according to 2K Experimental Design. Microstructural tests were performed using X-ray Diffraction, X-ray Fluorescence Spectrometry, Optical Microscopy, Scanning Electron Microscopy, and X-ray Micro-Computed Tomography. The results demonstrate that adding polymer increased tailings’ mechanical behaviors by forming packages with the lamellar particle, which was observed in microstructural tests. The polymeric composites’ brittle behavior was improved using fiber insertion, leading to an increase of the strain energy absorption capacity. The polymer-stabilized and fiber-reinforced gold ore tailings composites demonstrated its potential as a construction material, especially in landfill structures, tailings stockpiles, and paving base layers. The association of mechanical and microstructural analysis established a new understanding of the effect of the stabilizer and the reinforcement.

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“…The distribution of fibers in the internal structure of the filler has been studied in detail using many methods [33,34]. From a microscopic perspective [35,36], fibers enhance the internal structural density of the filling material [37] by occupying pores and retarding crack propagation, thereby bolstering the filling material's strength [38][39][40]. Xue [41] carried out microscopic experiments on the fiber-reinforced coarse aggregate cement backfill.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Multi-Size Basalt Fiber on Cemented Paste Backfill Mechanical Properties and Meso-Structure Characteristics

Chen,

Jiao,

Liu

et al. 2023

Minerals

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As the mine enters the deep mining stage, there is a need to enhance the compressive strength and toughness of the backfill. The objective of this study is to examine the mechanical properties of cemented tailings backfill after the incorporation of multi-size fibers and to validate the toughening mechanism of basalt fibers (BFs). To achieve this, a series of basic mechanical property tests for multi-size BFs mixing were devised, accompanied by industrial computerized tomography (CT) scanning and discrete element simulation. This study shows that the compressive strength increases and then decreases with the increase of BF dosage at a certain percentage of each size, and the splitting tensile strength gradually increases with the increase of BF dosage. The compressive strength tends to decrease and then increase, and the splitting tensile strength increases and then decreases as the fiber size ratio changes. The distribution of cemented tailings backfill and BF within the discrete element model is random. A few BF cannot play a bridging role; however, a moderate amount of BF is relatively uniformly distributed in the model to form a network structure, which generates a bond between the particles and the matrix and can effectively limit the expansion path of cracks and enhance the toughness.

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Influence of Polypropylene Fiber-Reinforcement on the Mechanical Behavior of Gold Ore Tailings through Direct Shear Tests

Cited by 9 publications

References 30 publications

Key Success Factors for the Practical Application of New Geomaterials

Key Success Factors for the Practical Application of New Geomaterials

Proposal of New Construction Material: Polymer-Stabilized Gold Ore Tailings Composite

The Influence of Multi-Size Basalt Fiber on Cemented Paste Backfill Mechanical Properties and Meso-Structure Characteristics

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