Performance of Soft Soil Stabilized by Fly Ash with Natural Fiber Reinforcement as Landfill Cover Layer
Journal Title: International Journal of Innovative Research in Advanced Engineering - Year 2016, Vol 0, Issue 0
Abstract
The use of clay as a landfill cover system is a choice of alternative materials that are widely used in almost all the existing landfill system in Indonesia and in the world. In addition to the relatively low cost of procurement is also available in almost all regions in Indonesia. However, alternative reliable overburden landfills has not been much discussed and researched. The purpose of this study is to design an ideal final cover layer landfill technically and mechanically. The results showed that the addition of fly ash and palm oil fiber (POF) between 10% of fly ash and 0.5% of POF can enhance the mechanical value of soils. the compressive strength of soils increase from 39.4 kPa to 89.0 kPa or rose by 129%, decreasing the value of soil hydraulic conductivity is to be 1,2x10-7 from the initial value of 1,17x10-6 or decreased by 850.4%, increase in soil friction angle of 8.55° to 24 °, and lowering the soil liquid limit of 33.48% to 24.5%, decreasing of swelling potential of 8 % to only 1.5% at the end of the wetting cycle, reduce the cracking intensity factor (CIF) from 1.96% to zero cracks. Mechanical behavior is heavily influenced by the nature of fly ash which has of a small water absorption and change the water in the soil for the pozzolanic reaction and produce calcium hydrate silica (CSH), in which the reaction is to form granules (binder) in the soil so that the soil becomes dense and hard, while palm oil fiber have cellulose and lignin as dominant compounds that tend to have high water absorption but serves to strengthen the fiber tensile force between the fibers and the soils surface due to adhesion forces so that the soil is not easily collapse and reduce the potential shrinkages and cracking of the soils..
Authors and Affiliations
Sukiman Nurdin, Lawalenna Samang, Johannes Patanduk, Tri Harianto
Keywords
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