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<p>The need to reduce the consumption of ordinary Portland cement (OPC) in concrete has driven the interest in sustainable alternatives. In this study, self-compacting concrete (SCC) incorporating eggshell powder (ESP), an agro-waste rich in calcium carbonate, and micro silica (MS), a highly reactive pozzolan, was used as partial cement replacement. SCC mixes were prepared with a water-to-binder ratio of 0.36 following EFNARC guidelines. Binary blends with 5–20% MS and ternary blends with 10% MS and 5–20% ESP were developed. Fresh properties were assessed using slump flow, V-funnel, L-box, and J-ring tests. The mechanical performance was measured by compressive, splitting tensile, and flexural strengths at 7 and 28 days, while the microstructural features were examined using scanning electron microscopy and energy dispersive spectroscopy (SEM–EDS). The ternary blend containing 10% ESP and 10% MS achieved the optimum performance, with 28-day compressive, tensile, and flexural strengths of 39.6, 6.34, and 4.88&#xa0;MPa, respectively. ESP content above 15% reduced the strength owing to dilution effects. Overall, the results demonstrate that ESP, when optimally combined with MS, can improve the workability, strength, and durability of SCC while reducing its environmental impact.</p> Graphical abstract <p></p>

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Mechanical, durability, and microstructural assessment of self-compacting concrete incorporating eggshell powder and micro silica

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • J. Kalaiselvi Nivedha,
  • Mainak Mallik,
  • Saurabh Dubey

摘要

The need to reduce the consumption of ordinary Portland cement (OPC) in concrete has driven the interest in sustainable alternatives. In this study, self-compacting concrete (SCC) incorporating eggshell powder (ESP), an agro-waste rich in calcium carbonate, and micro silica (MS), a highly reactive pozzolan, was used as partial cement replacement. SCC mixes were prepared with a water-to-binder ratio of 0.36 following EFNARC guidelines. Binary blends with 5–20% MS and ternary blends with 10% MS and 5–20% ESP were developed. Fresh properties were assessed using slump flow, V-funnel, L-box, and J-ring tests. The mechanical performance was measured by compressive, splitting tensile, and flexural strengths at 7 and 28 days, while the microstructural features were examined using scanning electron microscopy and energy dispersive spectroscopy (SEM–EDS). The ternary blend containing 10% ESP and 10% MS achieved the optimum performance, with 28-day compressive, tensile, and flexural strengths of 39.6, 6.34, and 4.88 MPa, respectively. ESP content above 15% reduced the strength owing to dilution effects. Overall, the results demonstrate that ESP, when optimally combined with MS, can improve the workability, strength, and durability of SCC while reducing its environmental impact.

Graphical abstract