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<p>This study focuses on the resource utilization of dredged clay, a common coastal construction byproduct with inferior engineering properties. Using cement-stabilized clay as the control, alkali-activated slag-fly ash geopolymer is employed as the stabilizer to investigate the pile-forming strength and solidification mechanism of treated clay. Unconfined compression tests are carried out to evaluate the effects of alkali-activator dosage, modulus, and slag-fly ash ratio on the 7 d, 14 d, and 28 d unconfined compressive strength (UCS). Macro‑microscopic analyses are conducted using Particle Image Velocimetry (PIV), Scanning Electron Microscopy (SEM), and X‑ray Diffraction (XRD). Results demonstrate that geopolymer-stabilized clay presents considerably higher strength than cement-stabilized soil. The optimal mixture is 12% alkali-activator with modulus 1.0 and a slag-fly ash ratio of 9:1, whose 28‑day UCS exceeds the cement sample (1.03&#xa0;MPa) by 2.86&#xa0;MPa and satisfies the laboratory strength criterion for cement-soil mixing piles. PIV observations reveal ductile failure with retarded crack initiation and steady microcrack growth, whereas cement-stabilized soil fails in brittle shear. Microstructural observations are consistent with the formation of C–A–S–H and N–A–S–H gels via dissolution, depolymerization, and polycondensation, forming a compact network that densifies the soil matrix with increasing curing age. This study provides laboratory-scale theoretical basis and technical support for the low-carbon and efficient resource utilization of dredged clay in pile engineering.</p>

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Geopolymer Stabilization of Dried Dredged Soil Using Slag and Fly Ash for Pile Applications

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Shuangxi Feng,
  • Tianhao Bu,
  • Huayang Lei,
  • Jiankai Li,
  • Xinyue Wang,
  • Yunyang Ge

摘要

This study focuses on the resource utilization of dredged clay, a common coastal construction byproduct with inferior engineering properties. Using cement-stabilized clay as the control, alkali-activated slag-fly ash geopolymer is employed as the stabilizer to investigate the pile-forming strength and solidification mechanism of treated clay. Unconfined compression tests are carried out to evaluate the effects of alkali-activator dosage, modulus, and slag-fly ash ratio on the 7 d, 14 d, and 28 d unconfined compressive strength (UCS). Macro‑microscopic analyses are conducted using Particle Image Velocimetry (PIV), Scanning Electron Microscopy (SEM), and X‑ray Diffraction (XRD). Results demonstrate that geopolymer-stabilized clay presents considerably higher strength than cement-stabilized soil. The optimal mixture is 12% alkali-activator with modulus 1.0 and a slag-fly ash ratio of 9:1, whose 28‑day UCS exceeds the cement sample (1.03 MPa) by 2.86 MPa and satisfies the laboratory strength criterion for cement-soil mixing piles. PIV observations reveal ductile failure with retarded crack initiation and steady microcrack growth, whereas cement-stabilized soil fails in brittle shear. Microstructural observations are consistent with the formation of C–A–S–H and N–A–S–H gels via dissolution, depolymerization, and polycondensation, forming a compact network that densifies the soil matrix with increasing curing age. This study provides laboratory-scale theoretical basis and technical support for the low-carbon and efficient resource utilization of dredged clay in pile engineering.