Experimental study on the permeability of Pb-contaminated silt solidified by CFG

Man Li, Qiang Wang, Jingdong Yang, Jinyang Cui, Xiaoliang Guo And Wenjun Zhou
Environmental Technology 2020 September 17, : 1-27
The permeability of soil is a fundamental parameter in hydrological and geotechnical studies, nevertheless, the investigations on the silt especially the heavy mental contaminated silt have rarely been reported. The research introduces the effect of the different factors, including the osmotic pressure, curing time, the content of binders and the concentration of lead, on the permeability and microscopic properties of lead contaminated silt solidified by a novel curing agent, formed by mixing cement, fly ash and desulfurization gypsum (CFG). According to the tests of the permeability and scanning electron microscope (SEM), the permeability of samples are investigated under different influencing factors. And the different analysis methods, including intuitive analysis, normalization analysis and orthogonal analysis, are used. The results demonstrates that the permeability coefficient of the contaminated silt increases with the increasing osmotic pressure as well as lead ion concentration, and decreases with the increasing CFG content as well as the curing time, and there are interactions among various factors, which jointly affect the permeability of samples. Moreover, the statistical analysis shows that osmotic pressure has the most significant effect on permeability among various factors, besides, the influence of lead ion concentration, osmotic pressure and CFG content on the permeability coefficient at the curing age of 14d is more significant than that of 28d, and the influence order of factors was slightly different at different curing age. Furthermore, the SEM test proves the conclusion of the statistical analysis and also explain the common reasons for the enhancement of the impermeability and unconfined compressive strength (UCS) of the lead contaminated silt with the increasing curing time.

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