caa a22 4500 467931178 CHVBK 20180406152943.0 cr unu---uuuuu 170328e20061001xx s 000 0 eng 10.1007/s10706-005-2214-7 doi (NATIONALLICENCE)springer-10.1007/s10706-005-2214-7 Sand-Attapulgite Clay Mixtures as a Landfill Liner [Elektronische Daten] [Amer Al-Rawas, Yahia Mohamedzein, Abdulaziz Al-Shabibi, Salem Al-Katheiri] Absrtract: 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. Springer, 2006 Attapulgite nationallicence hydraulic conductivity nationallicence landfill liners nationallicence shear strength nationallicence swelling nationallicence Al-Rawas Amer Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, 33, 123, Al-Khod, Sultanate of Oman aut Mohamedzein Yahia Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, 33, 123, Al-Khod, Sultanate of Oman aut Al-Shabibi Abdulaziz Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, 33, 123, Al-Khod, Sultanate of Oman aut Al-Katheiri Salem Minerals Department, Directorate General of Commerce and Industry - Governorate of Dhofar, Ministry of Commerce and Industry, Sultanate of Oman aut Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1365-1383 0960-3182 24:5<1365 2006 24 10706 https://doi.org/10.1007/s10706-005-2214-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10706-005-2214-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Al-Rawas Amer Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, 33, 123, Al-Khod, Sultanate of Oman aut NATIONALLICENCE 700 1- Mohamedzein Yahia Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, 33, 123, Al-Khod, Sultanate of Oman aut NATIONALLICENCE 700 1- Al-Shabibi Abdulaziz Department of Civil and Architectural Engineering, College of Engineering, Sultan Qaboos University, 33, 123, Al-Khod, Sultanate of Oman aut NATIONALLICENCE 700 1- Al-Katheiri Salem Minerals Department, Directorate General of Commerce and Industry - Governorate of Dhofar, Ministry of Commerce and Industry, Sultanate of Oman aut NATIONALLICENCE 773 0- Geotechnical & Geological Engineering Kluwer Academic Publishers 24/5(2006-10-01), 1365-1383 0960-3182 24:5<1365 2006 24 10706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer