GMCs stabilized/solidified Pb/Zn contaminated soil under different curing temperature: leachability and durability

Wang, Fei; Zhang, Yunhui; Shen, Zhengtao; Pan, Hao; Xu, Jian; Al-Tabbaa, Abir

GMCs stabilized/solidified Pb/Zn contaminated soil under different curing temperature: leachability and durability

2019

In this study, the impact of the curing temperature on leaching behaviour and durability of GGBS-MgO-CaO (GMC)-stabilized/GMC-solidified Pb/Zn-contaminated clay soils was investigated. Toxicity characteristic leaching procedure (TCLP) test, wetting-drying cycles, freeze-thaw cycles and unconfined compression strength (UCS) test were carried out. The influence of curing temperature, binder dosage and curing time on the performance of these samples was investigated. The results show that the leachability and the durability of all samples were improved by increasing curing temperature, curing time and binder dosage. GMCs are more functional in immobilizing Pb compared with Zn, especially in immobilizing high Pb–contaminated soils. The mass loss and Pb/Zn leachability of all samples increased, while their strength decreased after cyclic wetting-drying and cyclic freeze-thaw. Furthermore, curing at 21 °C and 45 °C, the freeze-thaw resistance of 10% GMC-treated soil (GMC10) was found better than that of 10% Portland cement–treated soil (PC10). After 10 cycles of wetting-drying, GMC10 is more chemically stable than PC10.

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