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Effects of freeze-thaw on characteristics of new KMP binder stabilized Zn- and Pb-contaminated soils

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Abstract

For viable and sustainable reuse of solidified/stabilized heavy metal-contaminated soils as roadway subgrade materials, long-term durability of these soils should be ensured. A new binder, KMP, has been developed for solidifying/stabilizing soils contaminated with high concentrations of heavy metals. However, the effects of long-term extreme weather conditions including freeze and thaw on the leachability and strength of the KMP stabilized contaminated soils have not been investigated. This study presents a systematic investigation on the impacts of freeze-thaw cycle on leachability, strength, and microstructural characteristics of the KMP stabilized soils spiked with Zn and Pb individually and together. For comparison purpose, Portland cement is also tested as a conventional binder. Several series of tests are conducted including the toxicity characteristic leaching procedure (TCLP), modified European Community Bureau of Reference (BCR) sequential extraction procedure, unconfined compression test (UCT), and mercury intrusion porosimetry (MIP). The results demonstrate that the freeze-thaw cycles have much less impact on the leachability and strength of the KMP stabilized soils as compared to the PC stabilized soils. After the freeze-thaw cycle tests, the KMP stabilized soils display much lower leachability, mass loss, and strength loss. These results are assessed based on the chemical speciation of Zn and Pb, and pore size distribution of the soils. Overall, this study demonstrates that the KMP stabilized heavy metal-contaminated soils perform well under the freeze-thaw conditions.

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Acknowledgments

This research is financially supported by the National Natural Science Foundation of China (grant no. 51278100, 41330641, and 41472258), Natural Science Foundation of Jiangsu Province (grant no. BK2012022), and National High Technology Research and Development Program of China (grant no. 2013AA06A206). The authors thank the former graduate student, Mr. J. J. Zhu, for conducting some of the laboratory tests.

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Correspondence to Yan-Jun Du.

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Responsible editor: Céline Guéguen

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Wei, ML., Du, YJ., Reddy, K.R. et al. Effects of freeze-thaw on characteristics of new KMP binder stabilized Zn- and Pb-contaminated soils. Environ Sci Pollut Res 22, 19473–19484 (2015). https://doi.org/10.1007/s11356-015-5133-z

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  • DOI: https://doi.org/10.1007/s11356-015-5133-z

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