Assessment of strength and stiffness properties of compacted filtered iron ore tailings-Portland cement blends field stack

Autores/as

  • Nilo Cesar Consoli Universidade Federal do Rio Grande do Sul, Graduate Program in Civil Engineering, Porto Alegre, Brazil https://orcid.org/0000-0002-6408-451X
  • Aghileh Khajeh Universidade Federal do Rio Grande do Sul, Graduate Program in Civil Engineering, Porto Alegre, Brazil
  • João Paulo de Sousa Silva Exploration and Mineral Projects, Mineral Development Centre VALE S.A., Santa Luzia, Brazil https://orcid.org/0000-0001-9829-880X
  • Hélder Mansur Chaves Universidade Federal do Pará, Department of Civil Engineering, Brazil
  • Juan Pablo Ocampo-Patiño Universidade Federal do Rio Grande do Sul, Graduate Program in Civil Engineering, Porto Alegre, Brazil
  • Jorge Hernán Florez Gálvez Universidad del Quindío, Department of Civil Engineering, Armenia, Colombia

DOI:

https://doi.org/10.21703/0718-2813.2025.37.3234

Palabras clave:

iron ore tailings (IOTs), experimental stack, undisturbed samples, compressive strength, tensile strength, shear modulus

Resumen

Dry stacking of iron ore tailings (IOTs) with cementitious materials is a viable disposal option, but its large scale implementation faces challenges. Therefore, this study investigates the key factors influencing compaction in real field conditions, including moisture content (optimum moisture content and less than optimum moisture content), vibration frequency (0 Hz and 35 Hz), and number of roller passes (4P and 6P). To achieve this objective, an experimental IOT stack was constructed in five different layers using a specific amount of Portland cement as a cementing agent (2.5% by dry solid weight). Then, laboratory tests, such as unconfined compression, splitting tensile, and ultrasonic pulse velocity (UPV), were conducted on undisturbed samples to evaluate the unconfined compressive strength (qu), splitting tensile strength (qt), and initial shear modulus (G0). Based on the laboratory
tests conducted on the field-collected specimens, it was concluded that samples with moisture contents closer to the optimum moisture content (OMC), exposed to vibration, and subjected to six-roller passes exhibited superior mechanical performance. This study provides insights into optimizing the compaction process for large-scale IOT stack structures.

Descargas

Publicado

2025-05-28

Número

Sección

Artículos

Cómo citar

Assessment of strength and stiffness properties of compacted filtered iron ore tailings-Portland cement blends field stack. (2025). Obras Y Proyectos, 37, 33-40. https://doi.org/10.21703/0718-2813.2025.37.3234