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hydraulic properties of Bentonite :

Hydraulic and mechanical properties of compacted

2018-8-1  The hydraulic conductivity of the samples retrieved was in the order of 10 − 14 m/s and mainly related to the dry density of the samples, but overall it was lower than expected for the untreated FEBEX bentonite. The fact that the hydraulic gradients applied in this work were lower than those used to determine the hydraulic conductivity of the reference bentonite, and in some cases close to the critical hydraulic

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Hydraulic Properties of Polymerized Bentonites

For the hydraulic properties, the results of a swelling pressure test show that with comparable initial dry density, PB had higher swelling pressure than that of the UB. Under the identical void ratio, the PB had much lower permeability (k) than that of the UB with aggressive 0.6 M NaCl and 0.6 M CaCl 2 solutions. Based on the test results, the PB produced using the proposed conditions can be used as a barrier

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Hydraulic properties of dune sand–bentonite mixtures

2016-8-1  Hydraulic conductivity of the dune sand–bentonite mixtures decreases with increasing bentonite content. For bentonite content more than 12%, the saturated hydraulic conductivity is

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Measurement of hydraulic properties of bentonite

2016-4-1  The range of hydraulic conductivities of the bentonite cake was from 2.1 × 10− 11 m/s to 5.7 × 10− 10 m/s. The hydraulic conductivity of the bentonite cake deposited on Korean standard sand were compared with that of the bentonite cake deposited on filter paper to show the effect of the filter medium.

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Hydraulic Properties of Polymerized Bentonites

AbstractWith the goal of increasing the swelling pressure and lowering the permeability of ordinary sodium bentonite with high concentration cation solutions, the optimum conditions for producing p...

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Hydraulic and mechanical properties of compacted

Significant water content and dry density gradients across the bentonite barrier • Swelling capacity and permeability of retrieved bentonite determined in lab. • Swelling related to position in the barrier: depended on dry density, water content, salinity. • Permeability possibly affected by hydraulic gradient, microstructure evolution, free/adsorbed water.

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Measurement of hydraulic properties of bentonite

2016-4-1  The range of hydraulic conductivities of the bentonite cake was from 2.1×10 -11 m/s to 5.7×10 -10 m/s. The hydraulic conductivity of the bentonite cake deposited on Korean standard sand were compared with that of the bentonite cake deposited on filter paper to show the effect of the filter medium.

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Determination of mechanical and hydraulic properties

2021-1-7  In order to enhance the mechanical and hydraulic properties of a bentonite-sand mixture, an anionic and a cationic polyacrylamides with a content of 1, 2, 5, 10, and 15% respectively were added to the bentonite-sand mixtures. The polyacrylamides used in this study were water-soluble synthetic polymers with high molecular weights.

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Effect of alkaline solutions on bentonite properties ...

2017-5-23  For the Ca solutions, the hydraulic conductivity of the bentonite specimen to the 0.02 mol/L Ca(OH)2 solution (6.5 × 10−9 cm/s) was approximately an order of magnitude lower than that of the bentonite specimen to the 0.02 mol/L Ca(OH)2 + 1 mol/L CaCl2 solution (5.0 × 10−8 cm/s), whereas the hydraulic conductivity to the 0.02 mol/L Ca(OH)2 + 1 mol/L CaCl2 solution (pH = 11.3) (5.0 × 10−8

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Short-Term Hydraulic Conductivity and Consolidation ...

AbstractThe present study investigated the effectiveness of two soil-bentonite slurry wall backfills, specifically sand/conventional Na-bentonite (NaB) and sand/hexametaphosphate (SHMP)-amended Ca-...

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Hydraulic Properties of Polymerized Bentonites

For the hydraulic properties, the results of a swelling pressure test show that with comparable initial dry density, PB had higher swelling pressure than that of the UB. Under the identical void ratio, the PB had much lower permeability (k) than that of the UB with aggressive 0.6 M NaCl and 0.6 M CaCl 2 solutions. Based on the test results, the ...

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Hydraulic Properties of Domestic Bentonite-Sand Mixture

Hydraulic Properties of Domestic Bentonite-Sand Mixture as a Backfill Material in the High-level Waste Repository IL Objectives and Importance of the Project A repository for high-level radioactive wastes would be constructed in the hard rock at a depth of several hundreds meters

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Hydraulic Properties of Polymerized Bentonites

AbstractWith the goal of increasing the swelling pressure and lowering the permeability of ordinary sodium bentonite with high concentration cation solutions, the optimum conditions for producing p...

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SWELLING AND HYDRAULIC PROPERTIES OF Ca

2005-1-16  This study is intended to measure the swelling and hydraulic properties of Ca-bentonite which is considered as a candidate buffer material for a high level waste (HLW) repository in Korea. Based upon the experimental data measured, the effect of dry density, bentonite content, and initial water content on the swelling pressure will be analyzed.

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Effect of NaCl on hydraulic properties of bentonite

2020-1-22  Na-bentonite is very sensitive to chlorides, and flocculation occurs when it is exposed to saline environments. The purpose of this work is to investigate the properties of Na-bentonite and bentonite–palygorskite filler material for GCL in saline solutions in the range between 0.5% and 10% (0.09 and 1.8 M) NaCl concentration.

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Hydraulic Conductivity of Bentonite Grouted Sand

2010-8-31  properties of Ottawa sand based on ASTM standards. Wyoming sodium-bentonite grade CP-200 was used to prepare suspensions. The bentonite contains at least 70% fine particles that are smaller than 0.075 mm, and it swells freely at a minimum ratio of 8 ml/g. Bentonite properties are summarized in Table 2 (Mitchell and Soga 1976).

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Short-Term Hydraulic Conductivity and Consolidation ...

Short-Term Hydraulic Conductivity and Consolidation Properties of Soil-Bentonite Backfills Exposed to CCR-Impacted Groundwater ... Soil properties, Expansive soils, Compression, Hydraulic properties, Backfills, Consolidated soils Journal of Geotechnical and Geoenvironmental Engineering. Vol. 144, Issue 6 (June 2018) ©2018 American Society of ...

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Effect of alkaline solutions on bentonite properties ...

2017-5-23  The influence of alkaline aqueous solutions on the properties of bentonite was investigated to evaluate the performance of bentonitic engineered barriers when contacted with alkaline groundwater. Batch and hydraulic conductivity tests were conducted on Na-bentonite using six different alkaline aqueous solutions. For the batch tests, almost no change in the montmorillonite fraction of the ...

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Swelling Properties and Permeability of GMZ Bentonite

2021-2-3  Sustainability 2021, 13, 1622 2 of 12 retardation ability, swelling, a better cation exchangeability, low hydraulic activity, and self-healing. Na+-bentonite has been considered as an ideal buffer material in many coun- tries. A number of significant properties of bentonite and its

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Engineering Properties of Vertical Cutoff Walls

Soil–cement–bentonite (SCB) vertical cutoff walls are commonly used to control the flow of contaminated groundwater at polluted sites. However, conventional backfill consisting of ordinary portland cement (OPC) is associated with a relatively high CO 2 footprint. Potential chemical interactions between OPC and bentonite could also undermine the long-term durability of SCB materials.

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Hydraulic Properties of Domestic Bentonite-Sand Mixture

Hydraulic Properties of Domestic Bentonite-Sand Mixture as a Backfill Material in the High-level Waste Repository IL Objectives and Importance of the Project A repository for high-level radioactive wastes would be constructed in the hard rock at a depth of several hundreds meters

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Hydraulic properties of dune sand–bentonite mixtures

Abstract This paper presents a study on the valorization of local materials such as desert dune sand obtained from Laghouat region in the South Algeria and mine bentonite intended for the realization of liner base layers in the conception of insulation barriers for hazardous waste facilities. In practice, an economical mixture satisfying the hydraulic requirements is generally concerned.

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Hydraulic Properties of Polymerized Bentonites

DOI: 10.1061/(ASCE)MT.1943-5533.0002442 Corpus ID: 139283281. Hydraulic Properties of Polymerized Bentonites @article{Prongmanee2018HydraulicPO, title={Hydraulic Properties of Polymerized Bentonites}, author={N. Prongmanee and J. Chai and S. Shen}, journal={Journal of Materials in Civil Engineering}, year={2018}, volume={30}, pages={04018247} }

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Measurement of hydraulic properties of bentonite

Abstract Bentonite cake and filter cake on the surface of porous media result from the filtration of stabilizing slurry into the adjacent porous formation. This paper provides measurements of hydraulic conductivities of bentonite cake formed on Korean standard sand under various pressure levels. Two types of bentonite (Tixoton and Bentonil GTC4) were used to create the slurries with three ...

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SWELLING AND HYDRAULIC PROPERTIES OF Ca

2005-1-16  This study is intended to measure the swelling and hydraulic properties of Ca-bentonite which is considered as a candidate buffer material for a high level waste (HLW) repository in Korea. Based upon the experimental data measured, the effect of dry density, bentonite content, and initial water content on the swelling pressure will be analyzed.

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Hydraulic and mechanical properties of compacted

Abstract The FEBEX “in situ” test was performed at an underground laboratory in Grimsel (Switzerland) with the aim of studying the behaviour of components in the near-field of a nuclear waste repository. A gallery of 2.3 m in diameter was excavated through the granite and two heaters, simulating the thermal effect of the wastes, were placed inside, surrounded by a barrier of highly ...

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Effect of NaCl on hydraulic properties of bentonite

2020-1-22  Na-bentonite is very sensitive to chlorides, and flocculation occurs when it is exposed to saline environments. The purpose of this work is to investigate the properties of Na-bentonite and bentonite–palygorskite filler material for GCL in saline solutions in the range between 0.5% and 10% (0.09 and 1.8 M) NaCl concentration.

Read More
Hydraulic Conductivity of Bentonite Grouted Sand

2010-8-31  properties of Ottawa sand based on ASTM standards. Wyoming sodium-bentonite grade CP-200 was used to prepare suspensions. The bentonite contains at least 70% fine particles that are smaller than 0.075 mm, and it swells freely at a minimum ratio of 8 ml/g. Bentonite properties are summarized in Table 2 (Mitchell and Soga 1976).

Read More
Effect of NaCl on hydraulic properties of bentonite

2020-1-22  Na-bentonite is very sensitive to chlorides, and flocculation occurs when it is exposed to saline environments. The purpose of this work is to investigate the properties of Na-bentonite and bentonite–palygorskite filler material for GCL in saline solutions in the range between 0.5% and 10% (0.09 and 1.8 M) NaCl concentration.

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Hydraulic conductivity and compressibility

2017-4-25  An experimental program was undertaken for the index and engineering properties (compaction, hydraulic conductivity and consolidation) of various mix proportions of sand, silt and coal ash with bentonite as an admixture to act as a barrier material for landfills. Thirty-four mixes were tested in all with different categories of mixes comprising of bentonite–sand, bentonite–sand-coal ash ...

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