An Investigation on the utilization of fly ash and bentonite mixture as a bottom and/or upper liner material at waste disposal areas

In this study, Çatalağzı fly ash was mixed with betonite, as binding material, at 10, 20 and 30 percentages (dry weight bentonite/dry weight Çatalağzı fly ash) to obtain less permeable liner material. For mis purpose, the prepared mixtures were compacted at optimum water content and maximum dry density, and the permeabilities of which were determined using bom rigid wall permeameter and flexible wall permeameter. In addition, to see the effect of possible leachates from waste disposal areas (landfill) on the permeability, the experiments were conducted with basic (20% solution of NaOH) and asidic (20% solution of HC1) chemical liquids as well. In this context, it was observed that the long term permeabilities continiously changed and increased with the elapse of time. Furthermore, in case of finding a suitable mixture, additional laboratory tests such as indirect tensile tests, unconsolidated undrained (UU), consolidated undrained (CU) triaxial tests, consolidation tests were also conducted, andIV collapse potentials were also investigated to provide necessary geotechnical parameter for design. Finally, it was concluded that, %20 bentonite-Çatalağzı fly ash mixture may be used as a bottom and/or upper liner be used at waste disposal areas. If %20 bentonite-Çatalağzı fly ash mixture was used as a bottom and/or upper liner at waste disposal areas. The long term increasing trend of the permeability should be taken into account in the design. Science Code Key Words Page Number Supervisor 6240100 fly ash, bentonite, permeability, landfill, liner