Improvement of Original Soil with Addition of Variation of Embankment Based on CBR (California Bearing Ratio) Value

Abstract

Soil is the most widely used material in the construction of a construction. In order for the soil to carry the construction load on it, an improvement in the structure and density of the soil itself is needed. This is in accordance with the technical requirement that the soil must be hard. If the soil does not meet the requirements, it is necessary to stabilize it by adding embankment soil as in this study which stabilized clay soil with variations of 50% and 75% addition of selected embankment soil. Clay samples were taken in the Keramasan area. The test was carried out in the laboratory of the Department of Civil Engineering, State Polytechnic of Sriwjaya to determine the Comparison of CBR (California Bearing Ratio). The results showed that the original soil sample had a moisture content of 36.15%, a specific gravity of 2.55, a liquid limit of 65, 65%, plasticity index 31.36% and CBR 9.00%. Based on the USCS Classification, the soil sample belongs to the CH type, which is clay with a moderate to poor rating. From the results of soil testing that has been stabilized, the optimal water content is 31%, specific gravity is 2.60, liquid limit is 54.04%, plasticity index (IP) is 24.70% and CBR 11.85 (addition of 50% of selected embankment soil). ). While the addition of 75% of the selected embankment soil, obtained the optimum moisture content of 25.1%, specific gravity 2.60, liquid limit 36.61%, IP 13.19% and CBR 12.02%. It can be concluded that the addition of 75% embankment soil gets a higher CBR value than the addition of 50% of embankment soil and original soil (without addition).