Delineation of compaction criteria for acceptable hydraulic conductivity of lateritic soil-bentonite mixtures designed as landfill liners

Amadi, Agapitus Ahamefule; Eberemu, Adrian O.

doi:10.1007/s12665-012-1544-z

Cited by 32 publications

(10 citation statements)

References 16 publications

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“…It is found that the LL, plastic limit (PL) and PI values increase linearly with an increase in the amount of bentonite in the mixture. The hydraulic conductivity of soil-bentonite mixes is reported by Amadi and Eberemu (2012) and Widomski et al (2015). The hydraulic conductivity of soil-bentonite mixtures decreases with either increase of bentonite content or compaction energy.…”

Section: Introductionmentioning

confidence: 79%

Characterization of pond ash-bentonite mixes as landfill liner material

Rout

Singh

2020

Waste Manag Res

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Characterization of pond ash-bentonite mixes is made to assess their suitability as liner material for waste disposal facilities by examining the relevant index and engineering properties. Further, a comparative assessment is made between sand-bentonite and pond ash-bentonite mixes for the range of bentonite content varying from 0 to 30% by weight at an interval of 5% to ensure an effective substitution of sand with pond ash. Addition of bentonite to sand or pond ash significantly influences the plasticity, strength and permeability properties. Besides, the shape parameters of the coarser fraction and morphology of compacted mixes also influence the engineering properties. A multiple linear regression equation is suggested to predict the hydraulic conductivity of these mixes by considering the basic material properties such as liquid limit, plasticity index and void ratio as an input variable with a correlation coefficient of 0.92 between the measured and predicted hydraulic conductivity values. At comparable conditions, compacted pond ash-bentonite mixes exhibit higher strength but also higher permeability than sand-bentonite mixes. Pond ash-bentonite and sand-bentonite mixes met the liner requirements when compacted with modified Proctor compaction effort at a minimum bentonite content of 20% and 15%, respectively.

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Section: Introductionmentioning

confidence: 79%

Characterization of pond ash-bentonite mixes as landfill liner material

Rout

Singh

2020

Waste Manag Res

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“…They usually possess low shear and tensile strength, high porosity, high permeability, and their properties are mainly influenced by the surrounding environmental conditions [29]. Conversely, soil compaction remolds the soil into clods, thus minimizing the interclod voids and ensuring reductions in the permeability and consolidationsettlement of the compacted soil, as well as increasing tensile and shear strength [16,30]. Therefore, the process by which air is displaced from the pores between soil grains (due to the densification caused by the application of mechanical stress) is termed soil compaction.…”

Section: Essentialness Of Soil Compactionmentioning

confidence: 99%

“…Soil compaction is typically achieved within a precise range of moisture contents and dry densities. This specification is principally grounded in the aim of achieving a maximum dry density, therefore controlling the performance of compacted soil liners with respect to their permeability [30]. Hence, the key objectives of compacting a soil mass are to increase load-bearing capacity, prevent soil settlement and frost damage, provide stability, and reduce water seepage, swelling, and contraction [31,32].…”

Section: Essentialness Of Soil Compactionmentioning

confidence: 99%

A critical reappraisal of residual soils as compacted soil liners

2019

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Compacted residual soils are often used as liner materials in engineered landfills, tailings dams, solar ponds, and canals, etc. to minimize the migration of contaminants into the surrounding environment and groundwater. To date, there has not been an extensive and adequate review of the suitability of different residual soil types for use as compacted liner materials. This paper reviews the suitability, merits, demerits, and possible applications of using expansive and lateritic residual soils as compacted soil liners. The review is then complemented by a study of the geotechnical properties of lateritic residual and shrinkable soils from Peninsular Malaysia. Suitability was assessed based on engineering property data for both soil types, collected from various journal papers, workshops, proceedings of conferences, and symposia from around the world. These properties were then compared with the standard requirements for use as liner materials. Descriptive statistics were employed to better assess the individual criteria of using both residual soil types as compacted soil liners. The results indicate that expansive and lateritic soils can be effectively utilized as liner materials if more acceptable materials are not readily available. The study addresses untreated soils but does not discuss the stabilization aspects.

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“…After consolidation had been accomplished, the permeability tests were started. The tests proceeded with use of the flow pump technique, designed for low-permeability material (Aiban and Znidarcić, 1989;Amadi and Eberemu, 2012). As an example, characteristics of the predicted permeability coefficient and its changes due to extended curing time for different material densities are presented in Figure 3.…”

Section: Permeability Testsmentioning

confidence: 99%

Bentonite cut-off walls: solution for landfill remedial works

Koda

Osinski

2017

Environmental Geotechnics

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2The application of landfill containment systems such as cut-off walls could be used effectively as one of the remedial solutions limiting environmental hazards caused by such sites. The complexity and weight of problems concerning remediation works of old sanitary landfills having been considered and interdisciplinary engineering and ecological solutions are recommended. This paper discusses threats to the environment emerging from old landfills and polluted areas and presents examples of engineering solutions used for the remediation of the old, large embankment-type Radiowo landfill located in Warsaw, Poland. The principal remediation problem for the Radiowo landfill was protection systems against leachate migration and groundwater pollution. The research included bentonite vertical barrier quality tests involving both laboratory and on-site hydraulic conductivity tests.Furthermore, a quality assessment based on the groundwater flow and transport modelling and an analysis of monitoring records are presented. The output of the research is the proposal of a dual device employing monitoring and numerical modelling processes for the purpose of controlling the self-purification of soil-water environments after the implementation of containment systems on contaminated sites.

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Delineation of compaction criteria for acceptable hydraulic conductivity of lateritic soil-bentonite mixtures designed as landfill liners

Cited by 32 publications

References 16 publications

Characterization of pond ash-bentonite mixes as landfill liner material

Characterization of pond ash-bentonite mixes as landfill liner material

A critical reappraisal of residual soils as compacted soil liners

Bentonite cut-off walls: solution for landfill remedial works

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