Journal ArticleDOI
Sand–Attapulgite Clay Mixtures as a Landfill Liner
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In this article, the potential use of sand-attapulgite (palygorskite) mixtures as a landfill liner was investigated and the results showed that the addition of clay developed coating between and around the sand grains which results in filling the voids and reducing the hydraulic conductivity of the sand-clay mixtures.Abstract:
This paper investigates the potential use of sand–attapulgite (palygorskite) mixtures as a landfill liner. The sand and attapulgite clay used in this study were brought from Wahiba (eastern Oman) and Al-Shuwamiyah (southern Oman), respectively. Initially the basic properties of the sand and clay were determined. Then the attapulgite clay was added to the sand at 5, 10, 20 and 30% by dry weight of the sand. The sand–attapulgite clay mixtures were subjected to mineralogical, chemical, microfabric and geotechnical analyses. The X-ray diffraction (XRD) qualitative analysis showed that attapulgite is the major clay mineral. The chemical compounds, exchangeable cations and cation exchange capacity (CEC) for the␣samples were determined. The CEC for the sand–clay mixtures is low but increases with the increase in clay content. The scanning electron microscope (SEM) examination showed that the addition of clay developed coating between and around the sand grains which results in filling the voids and reducing the hydraulic conductivity of the sand–clay mixtures. The hydraulic conductivity values for the pure clay and sand + 30% clay mixture prepared at 2% above optimum water content are slightly higher than hydraulic conductivity requirements for landfill liners but can be acceptable. The geotechnical study which included grain size distribution, Atterberg limits, specific gravity, compaction, hydraulic conductivity and shear strength tests showed that the sand+30% clay mixture prepared at 2% above optimum water content can be considered to satisfy the requirements for landfill liners. For all sand–clay mixtures no swelling was recorded and the addition of clay to the sand improved the shear strength.read more
Citations
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The Influence of Kaolinite - Illite toward mechanical properties of Claystone
TL;DR: In this article, the relationship between clay minerals (kaolinite and illite) and rock properties of the claystone, including both mechanical (cohesion, friction angle, stress, and strain) and physical properties (natural water content, void ratio, and wet density), belonging to Warukin Formation of Kalimantan, Indonesia.
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Effects of confining pressure and effective stress on hydraulic conductivity of sand-clay mixtures
TL;DR: In this article, a comparison between indirect hydraulic conductivity tests and standard flexible wall tests in order to cut down the time needed to perform the test for different sand-Alqatif clay mixtures.
Journal ArticleDOI
Effect of attapulgite colloids on uranium migration in quartz column
TL;DR: In this article, the effect of attapulgite colloids on U(VI) migration in a quartz column was investigated based on a study of the stability of colloids and the sorption behavior of uranium on attapulegite, and the results showed that attapulate colloids are stable without disturbance, but changes on pH or addition of an electrolyte can reduce their stability.
Journal ArticleDOI
Influence of pH, soil humic acid, ionic strength and temperature on sorption of U(VI) onto attapulgite
Liqiang Tan,Liqiang Tan,Xiaoli Tan,Xiaoli Tan,Xuemei Ren,Huiyang Mei,Xiangke Wang,Xiangke Wang +7 more
TL;DR: In this article, the surface properties of attapulgite were investigated by N2-BET surface area and zeta potential analysis, which indicated an inner-sphere complexation.
Journal ArticleDOI
Compaction and swelling characteristics of sand-bentonite and pumice-bentonite mixtures
TL;DR: In this paper, the compaction and swelling characteristics of sand-bentonite and pumice-binarite mixtures were compared using available geo-materials from Turkey.
References
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Geotechnical practice for waste disposal
TL;DR: In this article, the authors present a general principles for the management of landfills and impoundments, and discuss the strategies for remediation technologies, such as cover systems, geomembrane liners, and monitoring wells.