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<p>This study explores the mechanical performance and microstructural behavior of Ultra High-Performance Concrete (UHPC) incorporating Corn Cob Ash (CCA) as a partial replacement for natural river sand, alongside a 20% replacement of cement with Ground Granulated Blast Furnace Slag (GGBFS). UHPC mixes with 0–20% CCA (by weight of sand) were evaluated for workability, compressive strength, split tensile strength, and flexural strength under water and oven curing. Results showed that increasing CCA reduced slump flow and strength, primarily due to its porous, irregular particles and high water absorption. Mixes with up to 5% CCA demonstrated acceptable mechanical performance, while higher levels led to significant strength losses and increased porosity. Microstructural analyses confirmed reduced hydration gel formation and increased voids with higher CCA content. Overall, CCA can be sustainably utilized in UHPC at low replacement levels without compromising structural integrity.</p>

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Performance of GGBFS-Blended UHPC with Corn Cob Ash as Sand Replacement: A Mechanical Perspective

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Abhishek Soni,
  • Raman Nateriya

摘要

This study explores the mechanical performance and microstructural behavior of Ultra High-Performance Concrete (UHPC) incorporating Corn Cob Ash (CCA) as a partial replacement for natural river sand, alongside a 20% replacement of cement with Ground Granulated Blast Furnace Slag (GGBFS). UHPC mixes with 0–20% CCA (by weight of sand) were evaluated for workability, compressive strength, split tensile strength, and flexural strength under water and oven curing. Results showed that increasing CCA reduced slump flow and strength, primarily due to its porous, irregular particles and high water absorption. Mixes with up to 5% CCA demonstrated acceptable mechanical performance, while higher levels led to significant strength losses and increased porosity. Microstructural analyses confirmed reduced hydration gel formation and increased voids with higher CCA content. Overall, CCA can be sustainably utilized in UHPC at low replacement levels without compromising structural integrity.