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<p>This study evaluated a low-cement binder composed of construction and demolition waste powder (CDWP) and recycled coal gangue powder (RCGP) for the solidification/stabilization of Pb/Zn-contaminated dredged slurry. Artificially contaminated slurry containing 5000&#xa0;mg/kg Pb and 5000&#xa0;mg/kg Zn was treated with 10% binder at different CDWP:RCGP ratios and compared with ordinary Portland cement (OPC). Mechanical performance, leaching behavior, durability, and microstructure were assessed through UCS, TCLP, freeze–thaw and wet-dry tests, SEM, and XRD. The results showed that B3 (CDWP:RCGP = 7:3) achieved the best overall performance. At 28 d, B3 exhibited low Pb leaching (0.78&#xa0;mg/L), lower than the OPC control (1.09&#xa0;mg/L), and maintained good durability, with mass losses of 4.25% after freeze–thaw cycles and 10.35% after wet-dry cycles, close to those of OPC. However, Zn immobilization remained weaker, especially in mixtures with high RCGP contents. Overall, the optimized CDWP-RCGP binder shows potential as a sustainable alternative to OPC for contaminated dredged slurry treatment.</p>

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Construction and Demolition Waste–based Coal Gangue Binder for Stabilizing/Solidifying Pb and Zn Contaminated Dredged Slurry

  • 期刊论文

  • 发表日期：

    2026年5月1日

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  • Xinhao Qin,
  • Jianwen Ding,
  • Chuanrong Xue,
  • Zhengtao Yang

摘要

This study evaluated a low-cement binder composed of construction and demolition waste powder (CDWP) and recycled coal gangue powder (RCGP) for the solidification/stabilization of Pb/Zn-contaminated dredged slurry. Artificially contaminated slurry containing 5000 mg/kg Pb and 5000 mg/kg Zn was treated with 10% binder at different CDWP:RCGP ratios and compared with ordinary Portland cement (OPC). Mechanical performance, leaching behavior, durability, and microstructure were assessed through UCS, TCLP, freeze–thaw and wet-dry tests, SEM, and XRD. The results showed that B3 (CDWP:RCGP = 7:3) achieved the best overall performance. At 28 d, B3 exhibited low Pb leaching (0.78 mg/L), lower than the OPC control (1.09 mg/L), and maintained good durability, with mass losses of 4.25% after freeze–thaw cycles and 10.35% after wet-dry cycles, close to those of OPC. However, Zn immobilization remained weaker, especially in mixtures with high RCGP contents. Overall, the optimized CDWP-RCGP binder shows potential as a sustainable alternative to OPC for contaminated dredged slurry treatment.