SPB和SPC固化稳定化镍锌污染土的强度及环境特性研究

doi:10.13722/j.cnki.jrme.2017.1193

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Abstract The systematic investigation on the strength and environmental safety properties of the SPB and SPC stabilized soil is presented in this paper. The field soil which has been industrial contaminated with nickel(Ni) and zinc(Zn) is studied. The SPB binder is composed of superphosphate and cement-activated steel slag and the SPC binder is composed of superphosphate and quicklime. The stabilized soils were tested for the unconfined compression strength，dry density，soil pH，acid neutralization capacity，toxic leaching characteristics and contaminant speciation varying with dosages and curing periods. The results demonstrate that the addition of two binders increases the unconfined compressive strength and soil pH，but reduces the toxicity leaching concentration of Ni and Zn. These results are interpreted based on the variations in chemical speciation of Ni and Zn and the capacity index of acid buffer of the stabilized soils. It was also found that the SPC stabilized soil had a lower pH value than that of PC under curing of 28 days. The SPC shows higher immobilization efficiency than PC at early curing. Overall，this study demonstrates that the SPB and SPC binders have positive effects on the immobilization of the heavy metal and the strength of the stabilized soils.

Key words： environmental engineering nickle/zinc composite binder solidification/stabilization strength properties environmental safety characteristics

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1193 OR http://www.rockmech.org/EN/Y2017/V36/I12/3062

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