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Ultra-High-Performance Concrete (UHPC) is a high-strength, durable material characterized by a dense microstructure and optimized mix design, providing superior resistance to environmental and mechanical stresses. This study explores the development of a UHPC mix by substituting quartz sand with manufactured sand (M-sand) and coal bottom ash (CBA) in equal proportion, aiming to improve sustainability without compromising mechanical properties. The mix comprises cement, silica fume, steel fibers, and high-range water-reducing admixture (HRWRA), with CBA and M-sand replacements at 10%, 20%, 30%, and 40% by weight. Experimental results indicate that the mix with 20% replacement of CBA and M-sand achieves the maximum compressive strength of 136.76 MPa and tensile strength of 15.9 MPa, demonstrating significant enhancements in mechanical performance. Furthermore, rapid chloride penetration and sorptivity tests confirm the exceptional impermeability of the mix, ensuring its durability against chloride ion ingress. The findings suggest that partial replacement of quartz sand with M-sand and CBA improves UHPC’s strength while contributing to its long-term durability and performance in demanding structural applications, offering an ideal solution for high-performance, sustainable construction.

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Mechanical and Durability Assessment of Ultra-High-Performance Concrete with Partial Replacement of Quartz Sand by Manufactured Sand and Coal Bottom Ash

  • 会议论文

  • 发表日期：

    2025年

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  • K. Swetha,
  • G. Nivetha,
  • V. Jaganathan

摘要

Ultra-High-Performance Concrete (UHPC) is a high-strength, durable material characterized by a dense microstructure and optimized mix design, providing superior resistance to environmental and mechanical stresses. This study explores the development of a UHPC mix by substituting quartz sand with manufactured sand (M-sand) and coal bottom ash (CBA) in equal proportion, aiming to improve sustainability without compromising mechanical properties. The mix comprises cement, silica fume, steel fibers, and high-range water-reducing admixture (HRWRA), with CBA and M-sand replacements at 10%, 20%, 30%, and 40% by weight. Experimental results indicate that the mix with 20% replacement of CBA and M-sand achieves the maximum compressive strength of 136.76 MPa and tensile strength of 15.9 MPa, demonstrating significant enhancements in mechanical performance. Furthermore, rapid chloride penetration and sorptivity tests confirm the exceptional impermeability of the mix, ensuring its durability against chloride ion ingress. The findings suggest that partial replacement of quartz sand with M-sand and CBA improves UHPC’s strength while contributing to its long-term durability and performance in demanding structural applications, offering an ideal solution for high-performance, sustainable construction.