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<p>The tailings disposal structure must be designed to manage a wide range of materials properties and conditions. The main variations are in particle size distribution and moisture content of the tailings produced by the beneficiation plant. The addition of cement can improve tailings’ mechanical characteristics, but the variability of materials in the field might affect the cement’s hydration. Accordingly, this study investigates the effects of Portland cement on the mechanical behavior of two iron ore tailings (IOTs) with distinct fines content compacted in different moisture contents. The experimental program evaluates the coupled effects of cement, moisture, and fines content on tailings behavior using simple shear tests (under initial effective vertical stresses of 30, 60, and 90&#xa0;kPa), which replicate stress conditions more relevant to slope stability. The results show that even a small amount of cement (1%) significantly enhances the shear strength of the tailings. The cementation is effective for tailings compacted on either the dry or wet side of the compaction curve (water contents varying 11–15%). Besides, the cementation tends to be slightly more effective for coarser tailings. The cement acts as a supplier for extra strength, stability, and security for the filtered stacking structures. These findings provide valuable insights for optimizing tailings disposal practices, ultimately improving the safety and stability of tailings storage facilities.</p>

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Influence of Moisture and Cement Content on the Undrained Shear Response of Iron Ore Tailings

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Nilo Cesar Consoli,
  • Aziz Tebechrani Neto,
  • Alexia Cindy Wagner,
  • João Vítor de Azambuja Carvalho,
  • Lessandro de Almeida Franco,
  • João Pedro Camelo Guedes,
  • João Paulo de Sousa Silva

摘要

The tailings disposal structure must be designed to manage a wide range of materials properties and conditions. The main variations are in particle size distribution and moisture content of the tailings produced by the beneficiation plant. The addition of cement can improve tailings’ mechanical characteristics, but the variability of materials in the field might affect the cement’s hydration. Accordingly, this study investigates the effects of Portland cement on the mechanical behavior of two iron ore tailings (IOTs) with distinct fines content compacted in different moisture contents. The experimental program evaluates the coupled effects of cement, moisture, and fines content on tailings behavior using simple shear tests (under initial effective vertical stresses of 30, 60, and 90 kPa), which replicate stress conditions more relevant to slope stability. The results show that even a small amount of cement (1%) significantly enhances the shear strength of the tailings. The cementation is effective for tailings compacted on either the dry or wet side of the compaction curve (water contents varying 11–15%). Besides, the cementation tends to be slightly more effective for coarser tailings. The cement acts as a supplier for extra strength, stability, and security for the filtered stacking structures. These findings provide valuable insights for optimizing tailings disposal practices, ultimately improving the safety and stability of tailings storage facilities.