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SHEN Shuiyue, LI Yuanyuan, LI Yunlong, DUAN Shuaipeng. Research on Engineering Characteristics of Modified Silica-Alumina-Based Waste Solidification/Stabilizing of Pb and Cd Contaminated Soil[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 223-230. doi: 10.3724/j.gyjzG23061402
Citation: SHEN Shuiyue, LI Yuanyuan, LI Yunlong, DUAN Shuaipeng. Research on Engineering Characteristics of Modified Silica-Alumina-Based Waste Solidification/Stabilizing of Pb and Cd Contaminated Soil[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(3): 223-230. doi: 10.3724/j.gyjzG23061402

Research on Engineering Characteristics of Modified Silica-Alumina-Based Waste Solidification/Stabilizing of Pb and Cd Contaminated Soil

doi: 10.3724/j.gyjzG23061402
  • Received Date: 2023-06-14
    Available Online: 2025-06-07
  • Publish Date: 2025-03-20
  • Modified silica-alumina-based waste material (MRF) was designed and investigated for its potential application in solidifying/stabilizing Pb and Cd contaminated soil. The unconfined compressive strength test, toxic leaching test and microscopic test were used to analyze the effect laws of different MRF dosing, curing age and other parameters on the strength characteristics and toxic leaching characteristics of Pb and Cd contaminated soil. The study showed that when the amount of MRF was 15%, the compressive strength of the cured body and the leaching concentrations of Pb and Cd met the requirements of strength limits of Chinese main road subgrade filler (4.0 MPa) and the concentration limits of Chinese surface water environmental standard V-class water (0.1, 0.01 mg/L), respectively. With the increase of MRF admixture and maintenance age, the peak stress and breaking strain of the cured body increased and decreased respectively, the compressive strength increased and the leaching concentrations of Pb and Cd decreased. The microstructure of the solidified/stabilized contaminated soil was a highly dense spatial structure, which generated adhesive gels such as AFt, C-S-H and C-A-S-H.
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