Hydraulic capability of polymer-treated GCLs in saline solutions at elevated temperatures

Ozhan, Hakki O.

doi:10.1016/j.clay.2018.05.007

Cited by 30 publications

(15 citation statements)

References 38 publications

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“…8,39 This polymer class has been widely applied for GCLs to modify clays, either in the form of a linear polymer or as cross-linked polymer. 4,17…”

Section: Common Polymers In Geotechnical Engineeringmentioning

confidence: 99%

“…Researchers have shown that certain polymers can reduce the permeability of liners when exposed to deionized water and even aggressive leachate. [1][2][3][4][5][6] The incorporation of polymers can create an increase in swelling pressure, improve membrane properties, and limit cation exchange. 3 Furthermore, polymer modification has shown to improve the replastification properties and waterbinding capacity of clays.…”

Section: Introductionmentioning

confidence: 99%

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A brief introduction to polymers and concepts of polymer modification of bentonite for barrier applications

Lieske

Verst

Maubeuge

et al. 2023

Civil Engineering Design

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Polymer‐modified bentonite has reached significant attention in recent years, as polymers have been found to increase the resistance of clay barriers to detrimental environmental conditions. Studies on polymer modification of clays for barriers, in most cases, address a specific bentonite with a specific means of modification based on a specific polymer product. The term polymer, however, generally describes a broad category of macromolecules able to create a wide range of possible properties of the modified clay. This article reviews the basics of polymer modification of clays for use in hydraulic barriers to provide a general basis for comparison and design of different modification products and methods. Basics of both primary material categories, that is, polymer and clay, are presented, followed by possible polymer–clay interactions related to polymer charge properties and structure. Possible enhancements associated with polymer modification, but also open questions are addressed.

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“…8,39 This polymer class has been widely applied for GCLs to modify clays, either in the form of a linear polymer or as cross-linked polymer. 4,17…”

Section: Common Polymers In Geotechnical Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A brief introduction to polymers and concepts of polymer modification of bentonite for barrier applications

Lieske

Verst

Maubeuge

et al. 2023

Civil Engineering Design

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“…24,25 In order to improve the chemical permeability of conventional sodium bentonite GCLs, bentonite-polymer composite GCLs (BPC GCLs) have been developed in recent years. [26][27][28] The research of hyperbranched poly(amidoamine) (PAMAM) as a continuous phase using aqueous dispersion method showed that intercalation of PAMAM took place in pre-expanded kaolinite to give exfoliated nanocomposite. 29 The modied montmorillonite by the preparation of poly (methylmethacrylate) nanocomposites with basal distance 1.95 nm exhibited better thermal stability and revealed tremendous affinity for removing pesticides from aquatic solutions.…”

Section: àmentioning

confidence: 99%

Attenuation of Cr/Pb in bauxite leachates by bentonite–polymer composite geosynthetic clay liners

Peng

et al. 2020

RSC Adv.

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“…It is frequently utilized in environment-related materials due to its excellent swelling properties and low permeability [ 8 , 9 , 10 ]. To protect soil and groundwater from pollution, landfills often use compacted clay liners (CCL), geosynthetic clay liners (GCL), geomembranes, and bentonite–sand mixtures (BS) as barrier systems [ 11 , 12 ]. However, CCL often cracks because of uneven settlement or dryness, which significantly weakens its impermeability.…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation of Polymer-Modified Bentonite and Sand Mixtures Based on Osmotic Pressure Principle

Zhang

et al. 2022

Materials

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Polymer-modified bentonite and sand mixtures (PMBS) are widely used in the engineering field due to their low cost and low permeability. In this study, different ionic types of polyacrylamides were used to modify bentonite to improve its swelling properties and impermeability. The physicochemical properties of polymer-modified bentonite were characterized by X-ray diffraction, particle size distribution, IR spectroscopy, SEM, and free swell index (FSI) to further demonstrate the successful organic modification of bentonite. To investigate the impermeability mechanism of PMBS from the perspective of osmotic pressure, the colloidal osmotic pressure of bentonite and hydraulic conductivity were compared. The results showed that anionic polyacrylamide (APAM) had the most obvious improvement on the swelling properties of bentonite, and 3% APAM increased the FSI of bentonite from 15 mL/2 g to 41 mL/2 g. With the increase in polymer dosage, the colloidal osmotic pressure of bentonite increased and the hydraulic conductivity of PMBS decreased significantly. The interior of PMBS is equivalent to a highly concentrated bentonite–sand–water system. When the colloidal osmotic pressure in the restricted space is higher than the external hydraulic pressure, it will prevent infiltration from occurring. When the external hydraulic pressure exceeds the high concentration of bentonite colloid osmotic pressure, the hydraulic conductivity may increase rapidly. Therefore, the impermeability of PMBS depends on the colloidal osmotic pressure of bentonite. Finally, it was confirmed that PMBS had a self-healing capacity by simulating damage to PMBS.

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Hydraulic capability of polymer-treated GCLs in saline solutions at elevated temperatures

Cited by 30 publications

References 38 publications

A brief introduction to polymers and concepts of polymer modification of bentonite for barrier applications

A brief introduction to polymers and concepts of polymer modification of bentonite for barrier applications

Attenuation of Cr/Pb in bauxite leachates by bentonite–polymer composite geosynthetic clay liners

Study on Preparation of Polymer-Modified Bentonite and Sand Mixtures Based on Osmotic Pressure Principle

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