FECT

Abstract: The subgrade soil serves as a foundation for highway pavement, designed to bear the load of vehicles passing over it. However, not all types of soil exhibit good physical and mechanical properties, especially soft clayey soils. To address this issue, soil stabilization methods are employed with the aim of improving the physical and mechanical characteristics of the soil. In this study, natural lime material and soft soil were used to determine the optimum value based on the percentage of the mixture. The lime stabilization was carried out with varying percentages of 5.5%, 8%, 10.5%, and 13%. The results of the research were highly positive, particularly with a lime percentage of 8%, as it effectively increased the plasticity index and reduced the activity value of the soil. The original soil's plasticity index was 28.01%, with an activity value of 1.89. However, after stabilization with 8% lime, the plasticity index decreased to 16.79%, and the activity value reduced to 1.14, indicating a decrease in the soil's potential for expansion. The stabilized mixture can be utilized as a subgrade material for flexible pavement.

Keywords: Soft soil, Stabilization, Lime, Plasticity Index, Activity Value.