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The contemporary trend towards utilizing highly reactive pozzolanic and high-performance materials in concrete is gaining momentum, driven by the pursuit of improved strength, durability, and sustainable infrastructure with a reduced carbon footprint. This study specifically concentrates on efficiently utilizing high-reactive Extracted Micro Silica (EMS) from Khyber Pakhtunkhwa Rice Husk Ash (RHA) to create high-performance and environmentally sustainable cement. Rice Husk, an agricultural byproduct, was sourced from the Charsadda district in KPK, Pakistan. The pozzolanic reactivity of RHA was found to be closely tied to the employed combustion techniques. Acknowledging the pozzolanic properties of RHA, the Charsadda sample was subjected to controlled combustion in a Ferro cement drum at temperatures between 600–700 ℃ for 24 h, to achieve higher SiO2 content. After combustion, micro silica was extracted using an optimized extraction method. Cement pastes were then prepared with 5% (EMS-P05), 15% (EMS-P15), and 25% (EMS-P25) EMS substitutions compared with the control mix. As the percentage of EMS substitution increased, all EMS-based samples showed greater compressive strength than the control mix. Notably, EMS-P05 and EMS-P15 mortars exhibited higher compressive strength compared to EMS-P25. Microstructure analysis (XRD and SEM) of cement pastes revealed that the incorporation of low dosages of EMS percentages (EMS-P05 and EMS-P15) resulted in high reactivity and a significantly improved microstructure forming additional CSH gel compared to the control mix. However, SEM micro scan investigations also uncovered un-hydrated cement, agglomeration of micro silica grains, and the presence of large voids at 25% EMS substitution (EMS-P25), indicating a less dense and porous microstructure due to over-saturation and poor dispersion of EMS. According to the current research, reactive EMS could serve as a source of revenue in the construction industry, contributing to the production of high-performance and environmentally friendly cement products.

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Enhancing Compressive Strength and Microstructure of Sustainable Cement Using Extracted Micro Silica from Rice Husk Ash: Insights from Sem and Xrd Analysis

  • 会议论文

  • 发表日期：

    2025年

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  • Muhammad Fahad Ullah,
  • Hesheng Tang,
  • Sheraz Abbas

摘要

The contemporary trend towards utilizing highly reactive pozzolanic and high-performance materials in concrete is gaining momentum, driven by the pursuit of improved strength, durability, and sustainable infrastructure with a reduced carbon footprint. This study specifically concentrates on efficiently utilizing high-reactive Extracted Micro Silica (EMS) from Khyber Pakhtunkhwa Rice Husk Ash (RHA) to create high-performance and environmentally sustainable cement. Rice Husk, an agricultural byproduct, was sourced from the Charsadda district in KPK, Pakistan. The pozzolanic reactivity of RHA was found to be closely tied to the employed combustion techniques. Acknowledging the pozzolanic properties of RHA, the Charsadda sample was subjected to controlled combustion in a Ferro cement drum at temperatures between 600–700 ℃ for 24 h, to achieve higher SiO2 content. After combustion, micro silica was extracted using an optimized extraction method. Cement pastes were then prepared with 5% (EMS-P05), 15% (EMS-P15), and 25% (EMS-P25) EMS substitutions compared with the control mix. As the percentage of EMS substitution increased, all EMS-based samples showed greater compressive strength than the control mix. Notably, EMS-P05 and EMS-P15 mortars exhibited higher compressive strength compared to EMS-P25. Microstructure analysis (XRD and SEM) of cement pastes revealed that the incorporation of low dosages of EMS percentages (EMS-P05 and EMS-P15) resulted in high reactivity and a significantly improved microstructure forming additional CSH gel compared to the control mix. However, SEM micro scan investigations also uncovered un-hydrated cement, agglomeration of micro silica grains, and the presence of large voids at 25% EMS substitution (EMS-P25), indicating a less dense and porous microstructure due to over-saturation and poor dispersion of EMS. According to the current research, reactive EMS could serve as a source of revenue in the construction industry, contributing to the production of high-performance and environmentally friendly cement products.