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Anionic contamination and its stabilization on the strength and plastic features of clay soils (vermiculite and sepiolite)
Soil & Sediment Contamination ( IF 2 ) Pub Date : 2020-04-09 , DOI: 10.1080/15320383.2020.1749829
Hanie Abbaslou 1 , Parvaneh Poorangha 1 , Somayeh Bakhtiari 1 , Ali Reza Ghanizadeh 1
Affiliation  

Utilizing fine-grained soils containing clay minerals in most of the structures due to the specific surface area, ion exchange capacity and high adsorption capacity of hazardous contaminants have always been considered with the geotechnical view of the environment. In this study, the effect of contamination and stabilization of anionic pollutants (As) on the most important mechanical and physical properties of Vermiculite and Sepiolite clay soils was evaluated. Various experiments were performed at different stages such as gradation, Atterberg limits, specific gravity, density, permeability coefficient, unconfined compression strength, determination of pollutant concentration, X-Ray diffraction, as well as X-Ray fluorescence on different treatments of soil and in two different treatment periods (7 and 28 days). Finally, by examining the results of different experiments, we analyzed the proportion of two soils as a liner and also contamination problems with regard to the application of engineering materials. It was concluded that by the passage of time, microstructure characteristics of soil constituents and soil soluble conditions affect the geotechnical properties of polluted soils with anionic factors; therefore, the soils used as engineering materials and exposed to contaminants should be evaluated for their geotechnical properties after contamination and modification, so that the decisions about their selection can be made more confidently. The analysis of experiments also indicates the change in soil properties due to contamination of soil with an anionic contaminant (increasing the plastic limit), as well as the improvement of most of the geotechnical properties after the modification and stabilization (reduction of plastic limit).



中文翻译:

阴离子污染及其对粘土(ver石和海泡石)的强度和塑性特征的稳定作用

由于比表面积,在大多数结构中都使用含有粘土矿物的细粒土壤,因此从岩土工程的环境角度出发,一直考虑到离子交换能力和有害污染物的高吸附能力。在这项研究中,评估了污染物和阴离子污染物(As)的稳定对Ver石和海泡石粘土最重要的机械和物理性能的影响。在不同阶段对土壤和土壤进行不同处理,例如分级,阿特伯格极限,比重,密度,渗透系数,无限制抗压强度,污染物浓度的测定,X射线衍射以及X射线荧光,进行了各种实验。两个不同的治疗期间(7天和28天)。最后,通过检查不同实验的结果,我们分析了两种土壤作为衬里的比例,以及与工程材料应用有关的污染问题。结论是,随着时间的流逝,土壤成分的微观结构特征和土壤可溶条件会影响受阴离子因素污染的土壤的岩土力学特性。因此,应在污染和改良后对用作工程材料和暴露于污染物的土壤的岩土性能进行评估,以便可以更加自信地做出选择的决定。实验分析还表明,土壤被阴离子污染物污染(增加了塑性极限)而引起的土壤特性变化,

更新日期:2020-04-09
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