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<p>This study investigates the use of treated and untreated eggshell powder (ESP) as a sustainable partial substitute for cement in mortar. ESP was incorporated at 5% and 7.5% replacement levels, with treated samples burned at 900&#xa0;°C for 0.5, 1, and 2&#xa0;h. Compressive strength tests revealed that mortar containing 5% of eggshells burned for 2&#xa0;h achieved a 25% strength increase after 90 days, while 7.5% replacement led to a 22.22% increase. Durability tests under acidic (MgSO₄) and alkaline (NaOH) environments for up to 90 days showed minimal variation in hardened mixture density (± 5.39%) and compressive strength reduction remained below 6.98% for all treated ESP mixes. These findings demonstrate that properly processed ESP can significantly enhance the mechanical strength and durability of cement mortar, offering a viable eco-friendly alternative to traditional cement.</p>

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Assessing the Durability of Eco-Friendly Mortars with Treated and Untreated Eggshell Powder as a Cement Substitute

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Nahla Hilal,
  • Taghreed Khaleefa Mohammed Ali,
  • Abdulrahman S. Mohammed,
  • Ayad S. Aadi,
  • Zouaoui R. Harrat

摘要

This study investigates the use of treated and untreated eggshell powder (ESP) as a sustainable partial substitute for cement in mortar. ESP was incorporated at 5% and 7.5% replacement levels, with treated samples burned at 900 °C for 0.5, 1, and 2 h. Compressive strength tests revealed that mortar containing 5% of eggshells burned for 2 h achieved a 25% strength increase after 90 days, while 7.5% replacement led to a 22.22% increase. Durability tests under acidic (MgSO₄) and alkaline (NaOH) environments for up to 90 days showed minimal variation in hardened mixture density (± 5.39%) and compressive strength reduction remained below 6.98% for all treated ESP mixes. These findings demonstrate that properly processed ESP can significantly enhance the mechanical strength and durability of cement mortar, offering a viable eco-friendly alternative to traditional cement.