4.6 Article

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

期刊

SUSTAINABILITY
卷 14, 期 20, 页码 -

出版社

MDPI
DOI: 10.3390/su142013648

关键词

gold mining tailings; polymer; fiber; compression; microstructural analysis

资金

  1. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)
  2. Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
  3. Geotechnical Laboratory
  4. Physical Properties of Rock Laboratory
  5. Geosciences Institute of the University of Brasilia
  6. Scanning Electron Microscopy Laboratory of the Federal University of Uberlandia

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This paper proposes a new construction material based on polymer-stabilized and fiber-reinforced gold ore tailings composites, showing potential for use in various construction applications. The mechanical and microstructural analysis provided a better understanding of the material's behavior and properties.
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/cm(3) and 1.8 g/cm(3)), 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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