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<p>The remediation of contaminated soils and the reutilization of industrial solid waste present dual challenges in environmental geotechnics. To achieve the goal of “pollution control through waste utilization,” this study systematically investigates the solidification/stabilization mechanisms of lead-contaminated soils treated with quaternary all-solid-waste geopolymers and waste tire textile fibers (WTTFs). Multiple sets of samples with varying lead concentrations (4000&#xa0;mg/kg and 12,500&#xa0;mg/kg) and WTTF contents (0% and 0.7%) were prepared. Unconfined compressive strength tests, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and inductively coupled plasma analysis were conducted after 7 and 28&#xa0;days of curing. At a lead concentration of 12,500&#xa0;mg/kg, the results demonstrate that the incorporation of quaternary all-solid-waste geopolymers markedly improves the mechanical strength and stabilization performance of the contaminated soils, increasing the unconfined compressive strength from 0.28&#xa0;MPa in untreated soil to 4.75&#xa0;MPa, while reducing the lead leachate concentration from 3.83 to 0.34&#xa0;mg/L. Microstructural analyses reveal that the synergistic formation of C–(A)–S–H gel and AFt is primarily responsible for the enhanced strength and effective encapsulation of lead ions. Moreover, WTTFs alone can reduce the lead leaching concentration by approximately 40%, indicating a noteworthy independent immobilization effect. The proposed solidification/stabilization method effectively achieves the dual goals of solid waste utilization and lead-contaminated soil remediation, providing new insights and theoretical support for sustainable environmental geotechnics.</p>

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Investigation of the solidification/stabilization of lead-contaminated soil by different quaternary all-solid-waste geopolymers combined with waste tire textile fibers

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Mingxing Xie,
  • Han Sun,
  • Liangtian Jia,
  • Zechao Feng,
  • Junjie Zheng,
  • Yifei Sun

摘要

The remediation of contaminated soils and the reutilization of industrial solid waste present dual challenges in environmental geotechnics. To achieve the goal of “pollution control through waste utilization,” this study systematically investigates the solidification/stabilization mechanisms of lead-contaminated soils treated with quaternary all-solid-waste geopolymers and waste tire textile fibers (WTTFs). Multiple sets of samples with varying lead concentrations (4000 mg/kg and 12,500 mg/kg) and WTTF contents (0% and 0.7%) were prepared. Unconfined compressive strength tests, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and inductively coupled plasma analysis were conducted after 7 and 28 days of curing. At a lead concentration of 12,500 mg/kg, the results demonstrate that the incorporation of quaternary all-solid-waste geopolymers markedly improves the mechanical strength and stabilization performance of the contaminated soils, increasing the unconfined compressive strength from 0.28 MPa in untreated soil to 4.75 MPa, while reducing the lead leachate concentration from 3.83 to 0.34 mg/L. Microstructural analyses reveal that the synergistic formation of C–(A)–S–H gel and AFt is primarily responsible for the enhanced strength and effective encapsulation of lead ions. Moreover, WTTFs alone can reduce the lead leaching concentration by approximately 40%, indicating a noteworthy independent immobilization effect. The proposed solidification/stabilization method effectively achieves the dual goals of solid waste utilization and lead-contaminated soil remediation, providing new insights and theoretical support for sustainable environmental geotechnics.