MgO-GGBS Binder–Stabilized/Solidified PAE-Contaminated Soil: Strength and Leachability in Early Stage
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 8
Abstract
The MgO granulated ground blast-furnace slag (GGBS) binder, as a novel binder, has gained increasing attention in recent decades in stabilization/solidification (S/S) to treat contaminated soils. In this study, the physical strength and leaching performance of an MgO-GGBS (MG) binder was examined and compared with (PC) portland cement and PC and fly ash (PF) regarding the S/S treatment of dimethyl phthalates (PAE) contaminated soil after 7-day curing. PC, GGBS, fly ash (FA) and MgO were used as binders and the effect of different MG dosages was discussed. The results show that the order of early-stage strength after 7-day curing was: , and PAE leachate concentrations was in the order of . The increase in MG dosage can improve the strength of binders and immobilize PAEs, while the increase of initial PAE concentrations () can reduce the strength and increase the leaching of PAE. Therefore, the MG binder showed a better performance for the S/S of PAE-contaminated soil than PC and PF binders. The relation between leachability and strength was further explored and is expected to provide guidance for the early-stage strength estimation after the S/S of PAE-contaminated clay soil with the MG binder.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This study is supported by the National Key R&D Program of China (2018YFC1803100), the National Natural Science Foundation of China (No. 51978157), and the Fundamental Research Funds for the Central Universities. The third author would like to thank the Killam Trusts of Canada for kindly providing the Izaak Walton Killam Memorial Postdoctoral Fellowship.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 8 • August 2021
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© 2021 American Society of Civil Engineers.
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Received: Mar 9, 2020
Accepted: Mar 24, 2021
Published online: May 24, 2021
Published in print: Aug 1, 2021
Discussion open until: Oct 24, 2021
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