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۱Stabilizing Landfill Clays with Phosphorus Treatment; A case study
اطلاعات انتشار: هشتمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۶
Due to their high buffering potential and very low permeability, cohesive soils are frequently used as water–proof–elements in landfill projects. However, stabilization of such clayey barriers has been a major issue in adapting cost–effective methods to enhance soil stability. Therefore, it was deemed worth investigating the effect of Di–Ammonium Phosphate (DAP) solutions compromised the majority part of phosphorus fertilizers to improve geotechnical properties of Hamedan’s clayey landfill barrier (located in the west part of Iran). A series of contaminated specimens were prepared by mixing sampled clays with industrial DAP in concentrations ranging from 0.01 to 0.1mole\l. The conventional geotechnical experiments such as compaction, unconfined compressive strength, and direct shear box were then performed. Findings indicate that: Increasing phosphorus ion concentration in the specimens improves Cohesion (by 24%), and unconfined compressive strength (by 12%), and decrease internal friction angle (by 11.78%) and maximum dry density (by 1.5%). Accordingly it could be deduced that leaching phosphorus ion through landfill blanket has a noticeable effect on the stability of the Hamedan’s landfills.<\div>

۲Investigating Effects of Phosphorus Ions on Geotechnical Properties of Bentonite
اطلاعات انتشار: هشتمین کنگره بین المللی مهندسی عمران، سال
تعداد صفحات: ۶
As pore fluid’s chemical properties in cohesive soils may have decisive effects on geotechnical characteristics of barriers, an investigation carried out to study bentonite–contaminant interactions at various phosphorus ion concentrations. Bentonite specimens were artificially contaminated by mixing the soil with di–ammonium phosphate (DAP) in concentrations ranging from 0.01 to 0.1mole\l. The conventional geotechnical experiments such as compaction, unconfined compressive strength, and direct shear box were performed. Findings on phosphorus ion impact on the water content (ω) change, dry density, unconfined compressive strength, internal friction angle, and cohesion indicate that: Increasing phosphate ion concentration in soil–electrolyte may lead to an increase in cohesion, and unconfined compressive strength of contaminated bentonite. The obtained results showed that 57% and 29% improvement in cohesion and unconfined compressive strength, respectively may be achieved by maintaining a high DAP concentration of about (0.1 mol\l). Our observations showed that a given value of 23% optimum water content with deionized water increased to 25% at the highest phosphorus ion concentration.<\div>
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