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Strength and Environmental Behaviours of Municipal Solid Waste Incineration Fly Ash for Cement-Stabilised Soil

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  • Zonghui Liu

    (Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China)

  • Jiaqi Li

    (College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China)

  • Liqiang Hu

    (Guangxi New Development Transportation Group Company Limited, Yulin 530029, China)

  • Xiaolei Zhang

    (Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China)

  • Shiying Ding

    (Guangxi Road and Bridge Engineering Group Company Limited, Nanning 530200, China)

  • Haodong Li

    (Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China)

Abstract

Many sandy soil foundations need to be solidified during traffic construction in Guangxi, China. Because it has a similar chemical composition as cement, municipal solid waste incineration fly ash (MSWIFA) can strengthen sandy soil. However, the chloride ions and heavy metals in MSWIFA may have a negative influence on the solidification of sandy soil. Thus, FA resource use faces great challenges. This study evaluates the feasibility of using MSWIFA to solidify sandy soil. The acetic acid buffer solution method was used in the leaching test to simulate the weak acid groundwater environment in the Guangxi karst landform. The effects of the treatment methods (washing with ferrous sulphate solution, pre-treatment of organics via chelation, and adding sugarcane ash) on the strength and environmental characteristics of fly ash cement-stabilised soil (FACS) are discussed in detail. The results indicate that the FACS unconfined compressive strength (UCS) decreased by 24.82–46.64% when 5% cement was replaced with FA. Sugarcane ash effectively improved the strength of FACS by more than 10%. The leaching concentrations of Zn and Cu in the FACS meet the concentration limit set by GB 16889-2008. The leaching concentrations of Cr and Pb after washing with 6% ferrous sulphate solution were reduced by more than 30%. Meanwhile, the FACS strength developed faster. Organic chelating agents solidified most heavy metals.

Suggested Citation

  • Zonghui Liu & Jiaqi Li & Liqiang Hu & Xiaolei Zhang & Shiying Ding & Haodong Li, 2022. "Strength and Environmental Behaviours of Municipal Solid Waste Incineration Fly Ash for Cement-Stabilised Soil," Sustainability, MDPI, vol. 15(1), pages 1-17, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:364-:d:1015344
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    References listed on IDEAS

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    1. Dong, Jun & Chi, Yong & Zou, Daoan & Fu, Chao & Huang, Qunxing & Ni, Mingjiang, 2014. "Energy–environment–economy assessment of waste management systems from a life cycle perspective: Model development and case study," Applied Energy, Elsevier, vol. 114(C), pages 400-408.
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