The Experts below are selected from a list of 1998 Experts worldwide ranked by ideXlab platform
Opeyemi E. Oluwatuyi - One of the best experts on this subject based on the ideXlab platform.
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compacted sawdust ash lime stabilised soil based hydraulic barriers for waste containment
Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 2018Co-Authors: Oluwapelumi O Ojuri, Opeyemi E. OluwatuyiAbstract:This study examined the impact of sawdust ash–lime (SDAL) stabiliser on the geotechnical characteristics of lateritic soil as an effective hydraulic barrier system for Landfill Liner application. S...
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Compacted sawdust ash–lime-stabilised soil-based hydraulic barriers for waste containment
Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 2018Co-Authors: Oluwapelumi O Ojuri, Opeyemi E. OluwatuyiAbstract:This study examined the impact of sawdust ash–lime (SDAL) stabiliser on the geotechnical characteristics of lateritic soil as an effective hydraulic barrier system for Landfill Liner application. S...
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strength and hydraulic conductivity characteristics of sand bentonite mixtures designed as a Landfill Liner
2017Co-Authors: Oluwapelumi O Ojuri, Opeyemi E. OluwatuyiAbstract:Compacted sandy soils with addition of bentonite have been used in a variety of geotechnical structures as engineered barriers, such as in Landfill Liners and hydraulic containment structures. In this study, Igbokoda sand was mixed with bentonite at varying percentages of 0%, 2%, 4%, 6%, 8% and 10% by weight of sand. Strength tests, which include compaction test, California Bearing Ratio (CBR) test and direct shear test, were performed on various sand-bentonite mixtures using standard methods. Hydraulic conductivity tests were also performed on various sand-bentonite mixtures in order to determine their suitability as Landfill Liner. Results from the tests showed that 8% of bentonite with sand mixture had a hydraulic conductivity below 1×10-7 cm/s, a cohesion value of 250 kN/m3 and a reasonable strength (CBR) value of 54.07% using the West Africa standard compactive method, hence being the safest of the selected varying percentages for the design of a Landfill Liner.
Oluwapelumi O Ojuri - One of the best experts on this subject based on the ideXlab platform.
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compacted sawdust ash lime stabilised soil based hydraulic barriers for waste containment
Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 2018Co-Authors: Oluwapelumi O Ojuri, Opeyemi E. OluwatuyiAbstract:This study examined the impact of sawdust ash–lime (SDAL) stabiliser on the geotechnical characteristics of lateritic soil as an effective hydraulic barrier system for Landfill Liner application. S...
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Compacted sawdust ash–lime-stabilised soil-based hydraulic barriers for waste containment
Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 2018Co-Authors: Oluwapelumi O Ojuri, Opeyemi E. OluwatuyiAbstract:This study examined the impact of sawdust ash–lime (SDAL) stabiliser on the geotechnical characteristics of lateritic soil as an effective hydraulic barrier system for Landfill Liner application. S...
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strength and hydraulic conductivity characteristics of sand bentonite mixtures designed as a Landfill Liner
2017Co-Authors: Oluwapelumi O Ojuri, Opeyemi E. OluwatuyiAbstract:Compacted sandy soils with addition of bentonite have been used in a variety of geotechnical structures as engineered barriers, such as in Landfill Liners and hydraulic containment structures. In this study, Igbokoda sand was mixed with bentonite at varying percentages of 0%, 2%, 4%, 6%, 8% and 10% by weight of sand. Strength tests, which include compaction test, California Bearing Ratio (CBR) test and direct shear test, were performed on various sand-bentonite mixtures using standard methods. Hydraulic conductivity tests were also performed on various sand-bentonite mixtures in order to determine their suitability as Landfill Liner. Results from the tests showed that 8% of bentonite with sand mixture had a hydraulic conductivity below 1×10-7 cm/s, a cohesion value of 250 kN/m3 and a reasonable strength (CBR) value of 54.07% using the West Africa standard compactive method, hence being the safest of the selected varying percentages for the design of a Landfill Liner.
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sawdust stabilization of lateritic clay as a Landfill Liner to retain heavy metals
Geo-Chicago 2016, 2016Co-Authors: I I Akinwumi, Oluwapelumi O Ojuri, Daniel Edem, Adebanji S OgbiyeAbstract:Compacted clay soils are commonly used as Landfill Liners. This research work was aimed at investigating the suitability of sawdust amended lateritic clay as a Landfill Liner to adsorb Pb and Cd, thereby protecting underground water. Index properties, compaction, strength and permeability tests were conducted on the unstabilized and stabilized clay in order to determine the effects of the sawdust on the geotechnical properties of the lateritic clay. Batch kinetics tests were utilized to determine the capacity of the clay and sawdust-amended clay to adsorb Pb and Cd. The soil, classified as A-7-6 and CH by AASHTO and unified soil classification systems, respectively, was admixed with 0%, 5%, 10%, 20%, and 30% sawdust by dry weight of the soil. Test results show that the specific gravity, plasticity index, maximum dry unit weight and unconfined compressive strength of the soil decreased with increasing sawdust content while the optimum moisture content and hydraulic conductivity increased with increasing sawdust content. The stabilization of the lateritic clay with ≤10% sawdust content was recommended for use as Landfill Liners, as they meet the standard hydraulic conductivity requirement and present a good adsorption of Pb and Cd.
Salem Alkatheiri - One of the best experts on this subject based on the ideXlab platform.
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sand attapulgite clay mixtures as a Landfill Liner
Geotechnical and Geological Engineering, 2006Co-Authors: Amer Alrawas, Yahia E A Mohamedzein, Abdulaziz S Alshabibi, Salem AlkatheiriAbstract: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.
Haijun Lu - One of the best experts on this subject based on the ideXlab platform.
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The Adsorption Capacity and Geotechnical Properties of Modified Clay Containing SSA Used as Landfill Liner-Soil Materials
Journal of Chemistry, 2015Co-Authors: Haijun Lu, Yiqie Dong, Jixiang Li, Changhong WangAbstract:The potential of clay containing 0~5% sewage sludge ash (SSA) is assessed for use as a Landfill Liner-soil material. Low temperature N2 adsorption, batch adsorption, permeability, and unconfined compressive strength tests are performed to evaluate pore structure, adsorption capacity, hydraulic conductivity, and unconfined compressive strength of the clays. The pore size distribution of the modified clay containing SSA is mainly composed of micropores (
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the adsorption capacity and geotechnical properties of modified clay containing ssa used as Landfill Liner soil materials
Journal of Chemistry, 2015Co-Authors: Haijun Lu, Yiqie Dong, Jixiang Li, Changhong WangAbstract:The potential of clay containing 0~5% sewage sludge ash (SSA) is assessed for use as a Landfill Liner-soil material. Low temperature N2 adsorption, batch adsorption, permeability, and unconfined compressive strength tests are performed to evaluate pore structure, adsorption capacity, hydraulic conductivity, and unconfined compressive strength of the clays. The pore size distribution of the modified clay containing SSA is mainly composed of micropores (<2 nm) and mesopores (2~7 nm). With the increasing of SSA from 0% to 5%, the adsorption capacity of Zn(II) and Cu(II) to the clay increases 37% and 273%, respectively. The hydraulic conductivity of modified clay is from 3.62 × 10−8 to 2.17 × 10−8 cm/s. At SSA = 3%, the unconfined compressive strength of the clay reaches the maximum value of 601.1 kPa. After the clay containing SSA is contaminated by acid and alkali chemical solutions, the amount of mesopores and hydraulic conductivity increase. The adsorption capacity and unconfined compressive strength of contaminated clay decrease about 2∼44% and 25.7∼38.2%, respectively. The modified clay containing SSA can meet the adsorption and geotechnical requirement of Landfill Liners.
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study on transport of cr vi through the Landfill Liner composed of two layer soils
Desalination, 2011Co-Authors: Haijun Lu, Mao Tian Luan, Jinli ZhangAbstract:Abstract A new Landfill Liner system composed of two-layer soils was proposed. The upper soil layer composed of 90% raw clay plus 10% lime contributes significant to bearing capacity of Liners, and the lower soil layer containing 3 or 6% granular activated carbon (GAC) or 3 or 6% acid-activated bentonite contributes to adsorption capacity of Liners. The results from unconfined compressive strength tests showed that the method of adding lime into Liner soil material was effective measure to improve compressive strength of Liners. The batch test results indicated that GAC and acid-activated bentonite were two potential materials for use as adsorptive amendments for trapping heavy metal ions in Liners. To investigate the transport of Cr(VI) through the new Liner system, laboratory column tests were performed. The column tests results indicated that the lower soil layer containing adsorptive amendments prevented effectively the transport of Cr(VI). The diffusion coefficients of Cr(VI) for Liner soil materials were back-calculated by a one-dimensional numerical transport program. The diffusion coefficient of Cr(VI) was 4.64 × 10−8 m2/s on average for the upper soil layer. The diffusion coefficient of the lower soil layer was 5.4 × 10−10 m2/s to 7.0 × 10−10 m2/s. The differences of diffusion coefficients may be due to different grain size distributions and moulding density between these soils.
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The effect of Landfill leachate pH to pollutants transport through Landfill Liners
2010 2nd International Conference on Education Technology and Computer, 2010Co-Authors: Haijun LuAbstract:In order to study the influence of Landfill leachate pH to adsorption of Cr(VI) onto Landfill Liners, batch testing was carried out in laboratory. The result of batch testing showed that the adsorption of Cr(VI) onto Landfill Liner-soil material decreases dramatically with the increasing of the pH values. However, the initial rapid drcease in adsorption capacity moderates as the Landfill leachate pH exceeds neutral. The relationship between of adsorption parameter (Qm, b) and Landfill leachate pH values is linear. The numerical model of pollutants transport was developed, and Cr(VI) migration law through Landfill Liner was predicted by the model. The result of numerical simulation showed that Cr(VI) migration is influenced obviously by Landfill leachate pH values. Hence, Landfill leachate pH values must be considered in numerical simulation of pollutants transport.
Amer Alrawas - One of the best experts on this subject based on the ideXlab platform.
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sand attapulgite clay mixtures as a Landfill Liner
Geotechnical and Geological Engineering, 2006Co-Authors: Amer Alrawas, Yahia E A Mohamedzein, Abdulaziz S Alshabibi, Salem AlkatheiriAbstract: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.
