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Environmental Science and Pollution Research

, Volume 25, Issue 16, pp 16050–16060 | Cite as

An evaluation of stabilised/solidified contaminated model soil using PC-based and MgO-based binders under semi-dynamic leaching conditions

  • Fei Wang
  • Zhengtao Shen
  • Abir Al-Tabbaa
Research Article

Abstract

The leaching performance of stabilised/solidified contaminated model soil was studied to investigate the benefit of stabilisation/solidification treatment using novel binders over conventional binders. Different combinations of Portland cement (PC), ground granulated blast-furnace slag (GGBS), pulverised fly ash (PFA), and magnesia (MgO) were used and grouped into PC-based and MgO-based binders. A semi-dynamic leaching test was used, where the cumulative releases of Zn, Cu, Ni, Pb, Ca, and Mg were measured and the effective diffusion coefficients (De) and the leachability indices (LX) were calculated. The effects of different binders and water/cement ratios (w/c) on the migration of different metals after treatment were also discussed. The results showed that w/c ratio has a significant impact on the cumulative leachability of heavy metals. The diffusion coefficients of Pb and Zn are higher than those of Cu and Ni. In addition, mixes (w/c at 0.5:1) showed better performance in immobilising heavy metals than mixes (w/c at 1:1), especially in the case of Cu, Ni, and Pb.

Keywords

Novel binders Stabilisation/solidification Semi-dynamic leaching Diffusion coefficient Leachability Heavy metal 

Notes

Funding information

The authors are grateful to Schlumberger Foundation for its financial help of the PhD studentship for the first author, and the later financial support from the National Natural Science Foundation of China (Grant No. 51608113) is greatly appreciated. The second author would like to thank the Killam Trusts of Canada for kindly providing the Izaak Walton Killam Memorial Postdoctoral Fellowship.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Geotechnical Engineering, School of TransportationSoutheast UniversityNanjingChina
  2. 2.Department of EngineeringUniversity of CambridgeCambridgeUK
  3. 3.Department of Earth and Atmospheric SciencesUniversity of AlbertaEdmontonCanada

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