MgO-GGBS Binder–Stabilized/Solidified PAE-Contaminated Soil: Strength and Leachability in Early Stage: Fid-Bau Portal

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MgO-GGBS Binder–Stabilized/Solidified PAE-Contaminated Soil: Strength and Leachability in Early Stage

Wang, Fei / Xu, Jian / Zhang, Yunhui / Shen, Zhengtao / Al-Tabbaa, Abir

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: $PF < MG < PC$ , and PAE leachate concentrations was in the order of $MG < PC \approx PF$ . The increase in MG dosage can improve the strength of binders and immobilize PAEs, while the increase of initial PAE concentrations ( $3,000 - 10,000 mg / kg$ ) 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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MgO-GGBS Binder–Stabilized/Solidified PAE-Contaminated Soil: Strength and Leachability in Early Stage

Wang, Fei / Xu, Jian / Zhang, Yunhui / Shen, Zhengtao / Al-Tabbaa, Abir

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: $PF < MG < PC$ , and PAE leachate concentrations was in the order of $MG < PC \approx PF$ . The increase in MG dosage can improve the strength of binders and immobilize PAEs, while the increase of initial PAE concentrations ( $3,000 - 10,000 mg / kg$ ) 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.

MgO-GGBS Binder–Stabilized/Solidified PAE-Contaminated Soil: Strength and Leachability in Early Stage

Wang, Fei / Xu, Jian / Zhang, Yunhui / Shen, Zhengtao / Al-Tabbaa, Abir

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: $PF < MG < PC$ , and PAE leachate concentrations was in the order of $MG < PC \approx PF$ . The increase in MG dosage can improve the strength of binders and immobilize PAEs, while the increase of initial PAE concentrations ( $3,000 - 10,000 mg / kg$ ) 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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Title:

MgO-GGBS Binder–Stabilized/Solidified PAE-Contaminated Soil: Strength and Leachability in Early Stage

Contributors:

Wang, Fei (author) / Xu, Jian (author) / Zhang, Yunhui (author) / Shen, Zhengtao (author) / Al-Tabbaa, Abir (author)

Published in:

Journal of Geotechnical and Geoenvironmental Engineering ; 147

Publication date:

2021-05-24

ISSN:

1090-0241 , 1943-5606

DOI:

https://doi.org/10.1061/(ASCE)GT.1943-5606.0002569

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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