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Mineral and Chemical Characterization of Geosynthetic Clay Liner Bentonite
Geosynthetic clay liner (GCL) is commonly used in cover system and bottom lining of waste containment facilities due to very low hydraulic conductivity of GCL bentonite. The GCL is consisting of thin layer of bentonite supported by geotextiles and/or geomembranes and held together by needle punched or stitch bonded fibres. For effective functioning of cover system, GCL must be hydrated and retained moisture/water. For retaining moisture within GCL, mineral and chemical composition of bentonite core of GCL needs to be investigated critically. Hence, in the present study, mineralogical and chemical characterization of bentonite core of a commercially available GCL were studied using X-ray diffraction, ion chromatography, Fourier transform infrared spectroscopy, scanning electron microscope, cation exchange capacity, specific surface area and swelling of bentonite. The X-ray diffraction of bentonite indicates the presence of primary mineral montmorillonite and minor minerals such as quartz, dolomite, feldspar and cristobalite. The interlayer cations of bentonite obtained from ion chromatography mainly consists of Na+ and some traces of NH4+, K+, Ca2+ and Mg2+, while Fourier transform infrared spectroscopy provides the detail of molecular interaction corresponds to stretching or bending vibration of particular bands and the positions of peaks. Cation exchange capacity, specific surface area and swelling index of bentonite were found to be 73.42 meq/100 g, 674.84 m2/g and 21 ml/2 g, respectively.
Mineral and Chemical Characterization of Geosynthetic Clay Liner Bentonite
Geosynthetic clay liner (GCL) is commonly used in cover system and bottom lining of waste containment facilities due to very low hydraulic conductivity of GCL bentonite. The GCL is consisting of thin layer of bentonite supported by geotextiles and/or geomembranes and held together by needle punched or stitch bonded fibres. For effective functioning of cover system, GCL must be hydrated and retained moisture/water. For retaining moisture within GCL, mineral and chemical composition of bentonite core of GCL needs to be investigated critically. Hence, in the present study, mineralogical and chemical characterization of bentonite core of a commercially available GCL were studied using X-ray diffraction, ion chromatography, Fourier transform infrared spectroscopy, scanning electron microscope, cation exchange capacity, specific surface area and swelling of bentonite. The X-ray diffraction of bentonite indicates the presence of primary mineral montmorillonite and minor minerals such as quartz, dolomite, feldspar and cristobalite. The interlayer cations of bentonite obtained from ion chromatography mainly consists of Na+ and some traces of NH4+, K+, Ca2+ and Mg2+, while Fourier transform infrared spectroscopy provides the detail of molecular interaction corresponds to stretching or bending vibration of particular bands and the positions of peaks. Cation exchange capacity, specific surface area and swelling index of bentonite were found to be 73.42 meq/100 g, 674.84 m2/g and 21 ml/2 g, respectively.
Mineral and Chemical Characterization of Geosynthetic Clay Liner Bentonite
Lecture Notes in Civil Engineering
Jose, Babu T. (editor) / Sahoo, Dipak Kumar (editor) / Shukla, Sanjay Kumar (editor) / Krishna, A. Murali (editor) / Thomas, Jimmy (editor) / Veena, V. (editor) / Khan, Vishwajeet (author) / Rajesh, S. (author)
Indian Geotechnical Conference ; 2022 ; Kochi, India
Proceedings of the Indian Geotechnical Conference 2022 Volume 8 ; Chapter: 19 ; 197-205
2024-07-14
9 pages
Article/Chapter (Book)
Electronic Resource
English
| NTIS | 1998
| NTIS | 1998
| British Library Conference Proceedings | 2002