Evaluating Coconut Fiber and Fly Ash Composites for Use in Landfill Retention Layers

<p>This study utilized a series of experimental tests, including the Atterberg limit, standard Proctor, permeability, and direct shear tests. Three composites were investigated: 85% fly ash-10% bentonite (V1), 90% ash-5% (V2), 95% ash-0% (V3). All contained 5% coconut fiber. The plasticity index (PI) increased significantly from 19.10% to 22.15%, with change in content 0% 10%. composite met landfill liner standards. permeability values low satisfied local criteria, namely 1.052 x 10-5 1.260 1.394 Composite V2 has best value cohesion 55 kPa angle 22°.Therefore, V3 was most promising as an alternative covering material for landfills because it lowest atterberg limits results, OMC, results test that meet criteria even though is not result among three variations. However, by supporting OMC good plasticity, chosen. This beneficial valuable engineering, selection, design materials used construction liners. .</p>