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<p>Dredged slurry, characterized by high water content and compressibility, poses significant challenges for construction projects. While lime stabilization is widely used, its efficiency diminishes under high-water-content conditions and may induce excessive brittleness. This study investigates the use of eggshell powder (ESP), an abundant and low-cost agricultural by-product, as a supplementary material combined with lime for stabilizing dredged clay. One-dimensional compression tests and microstructural analyses were conducted on specimens treated with 8% lime and ESP contents ranging from 0 to 20%, cured for 3 hours, 7&#xa0;days, and 28&#xa0;days. The results demonstrate that ESP-lime treatment markedly reduces soil compressibility. The compression yield stress increases with ESP content up to 10-15%, while the pre-yield, post-yield, and swelling indices decrease. Longer curing duration further enhances these improvements, with the most pronounced effects occurring within the first 7&#xa0;days. Microstructural observations reveal that ESP fills pores and lime promotes the formation of cementitious gels, resulting in a denser soil fabric. The findings confirm that ESP-lime combinations effectively improve the compressibility behavior of dredged soil, offering a sustainable and technically viable stabilization strategy for geotechnical applications.</p>

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Compression Behavior and Microstructural Mechanisms of Lime-Eggshell Powder Stabilized Dredged Material

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Shuai Yang,
  • Taoyuan Dong,
  • Zhehao Qiu,
  • Jianhua Wang,
  • Jie Yin

摘要

Dredged slurry, characterized by high water content and compressibility, poses significant challenges for construction projects. While lime stabilization is widely used, its efficiency diminishes under high-water-content conditions and may induce excessive brittleness. This study investigates the use of eggshell powder (ESP), an abundant and low-cost agricultural by-product, as a supplementary material combined with lime for stabilizing dredged clay. One-dimensional compression tests and microstructural analyses were conducted on specimens treated with 8% lime and ESP contents ranging from 0 to 20%, cured for 3 hours, 7 days, and 28 days. The results demonstrate that ESP-lime treatment markedly reduces soil compressibility. The compression yield stress increases with ESP content up to 10-15%, while the pre-yield, post-yield, and swelling indices decrease. Longer curing duration further enhances these improvements, with the most pronounced effects occurring within the first 7 days. Microstructural observations reveal that ESP fills pores and lime promotes the formation of cementitious gels, resulting in a denser soil fabric. The findings confirm that ESP-lime combinations effectively improve the compressibility behavior of dredged soil, offering a sustainable and technically viable stabilization strategy for geotechnical applications.