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Effect of salt solution on morphological changes of Geosynthetic Clay Liner

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Document pages: 8 pages

Abstract: Morphological changes of geosynthetic clay liner (GCL) samples were observed using two different osmotic water, distilled water and NaCl solution (100   mM concentration was observed in detail by microscopic analysis). GCL samples were hydrated with NaCl solution and observed by optical microscope. Although the surface of the treated GCL sample was similar to that of the untreated GCL sample, crystal deposits were found on the surface of the treated sample. Using scanning electron microscopy (SEM), compared with GCL samples hydrated with NaCl solution, the bentonite particles contained in GCL have a more solid appearance after hydrating the samples with distilled water. It seems that the hydration of salt solution will reduce the expansionng of the bentonite particles. Furthermore, the energy-dispersive X-ray spectrometer (EDS) results showed that distilled water hydration had no effect on the distribution of the elements contained in the GCL samples. However, bound chlorine was observed, which demonstrated that the bentonite particles had absorbed the NaCl solution. In addition, changes in the hydraulic conductivity of the hydrated GCL samples were also observed.

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