ANALISIS PENGGUNAAN ABU CANGKANG KELAPA SAWIT TERHADAP PENINGKATAN CBR TANAH LEMPUNG

Abstract

Soil is a collection of natural mineral granules (Ageregat) that can be mechanically separated if the ageregate is stirred in water or a collection of minerals, organic matter, and loose deposits, located on the bedrock. Rocks are rocks whose minerals are bound together by a permanent and strong cohesive force, and cannot be separated in a simple mechanical way. Land is the basis of a structure or construction, both building construction and road construction. Therefore, there needs to be soil improvement in order to increase the carrying capacity of the soil, one of which is by chemically repairing the soil. This study was emphasized to analyze soil characteristics using stabilization methods using Palm Shell Ash in accordance with the variation of each stabilization material against cbr value parameters. In addition to determining the physical properties of unstable soils, this study is also focused on determining the level of stabilization of materials that provide optimal carrying capacity in the soil. The percentage of stabilization materials used in this study was Palm Shell Ash: 0%, 3%, 7%, 11% 15%.The value of California Bearing Ratio (CBR) without soaking for the original soil condition is 0.1" by 4.50%, 0.2" by 4.80% while cbr value increase for addition of 3% ACKS, 7% ACKS, 11% ACKS, 15% ACKS increased consecutively by 9.10%, 14.15%, 15.50%, and 16.05%. That's because the size of the grain in palm oil shell ash is so small that it can close the pores on the soil. Certainly meet the specification of the basic ground strength of the highway required (CBR value requirement > 6%).