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<p>The research paper discusses the mechanical properties of red mud based geopolymer concrete. The effect of red mud addition to the precursor and the variation in molarity on the concrete property is assessed. After preliminary investigation, the composition of the precursor in the concrete was taken as 40% red mud, 30% fly ash and 20% ground granulated blast furnace slag. Molarity varied from 6 to 10&#xa0;M. To assess the impact of red mud, the outcomes were compared with fly ash- based geopolymer concrete (GC0, with 80% fly ash and 20% ground granulated blast furnace slag) and normal Portland cement concrete. The strength increased from 36.2 to 48.3&#xa0;MPa which amounts to a 33.4% rise when fly ash was replaced with red mud. Experiments for determining setting time, density, compressive strength, flexural strength and split tensile strength were conducted for all variations including GC0 and normal concrete. Red mud-based concrete took a longer time to set and attain full strength. Addition of ground granulated blast furnace slag deemed necessary for red-based concrete under ambient curing conditions. The compressive and flexural strength of red mud-based concrete surpassed that of the other variations whereas fly ash-based concrete exhibited the highest split tensile strength. Geopolymer concrete with 30% red and 20% ground granulated blast furnace slag at 12&#xa0;M molarity achieved a compressive strength of 56.8&#xa0;MPa and corresponding flexural and split tensile strengths of 5.91&#xa0;MPa and 2.82&#xa0;MPa, showing a significant improvement over normal concrete. Red mud in the matrix delayed the setting time, enhanced compactness, and enabled a complete geopolymer reaction. To support future research on the mechanical properties of red mud-based concrete, this paper introduces an equation to estimate flexural and split tensile strength from compressive strength. This innovative contribution enhances our understanding of red mud’s potential in geopolymer concrete applications, offering valuable insights for both current and future endeavours in this field.</p>

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Mechanically Activated Red Mud Based Geopolymer for Advanced Concrete Applications: Synthesis and Properties

  • 期刊论文

  • 发表日期：

    2025年3月14日

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  • Smita Singh,
  • Manjunath Amalkar,
  • Muttevi Chinmaya Dutta,
  • Dhanush Eshwar Rendi

摘要

The research paper discusses the mechanical properties of red mud based geopolymer concrete. The effect of red mud addition to the precursor and the variation in molarity on the concrete property is assessed. After preliminary investigation, the composition of the precursor in the concrete was taken as 40% red mud, 30% fly ash and 20% ground granulated blast furnace slag. Molarity varied from 6 to 10 M. To assess the impact of red mud, the outcomes were compared with fly ash- based geopolymer concrete (GC0, with 80% fly ash and 20% ground granulated blast furnace slag) and normal Portland cement concrete. The strength increased from 36.2 to 48.3 MPa which amounts to a 33.4% rise when fly ash was replaced with red mud. Experiments for determining setting time, density, compressive strength, flexural strength and split tensile strength were conducted for all variations including GC0 and normal concrete. Red mud-based concrete took a longer time to set and attain full strength. Addition of ground granulated blast furnace slag deemed necessary for red-based concrete under ambient curing conditions. The compressive and flexural strength of red mud-based concrete surpassed that of the other variations whereas fly ash-based concrete exhibited the highest split tensile strength. Geopolymer concrete with 30% red and 20% ground granulated blast furnace slag at 12 M molarity achieved a compressive strength of 56.8 MPa and corresponding flexural and split tensile strengths of 5.91 MPa and 2.82 MPa, showing a significant improvement over normal concrete. Red mud in the matrix delayed the setting time, enhanced compactness, and enabled a complete geopolymer reaction. To support future research on the mechanical properties of red mud-based concrete, this paper introduces an equation to estimate flexural and split tensile strength from compressive strength. This innovative contribution enhances our understanding of red mud’s potential in geopolymer concrete applications, offering valuable insights for both current and future endeavours in this field.