Analysis of shear strength clay using coconut shell charcoal powder as stabilization material

Abstract

One type of soil that has weak bearing capacity is clay. One parameter that can be reviewed is the soil shear strength value in the form of cohesion value (c) and internal shear angle (φ). To increase the bearing capacity of the soil can be done using stabilization materials. In this research, coconut shell charcoal powder is used to increase the shear strength of the soil so that it does not become a waste and can be used as a stabilizing material because coconut trees are quite widely available on the island of Bangka. Variations in the addition of coconut shell charcoal powder are 5%, 10%, and 15% of the dry weight of the soil. Tests conducted in this study are sieve analysis, consistency limits, specific gravity, compaction, and direct shear test. The testing standard used is SNI. Soil classification using the USCS method. The value of shear strength of clay soil increased with the addition of the percentage of coconut shell charcoal powder from 26.844 kN/m2 for clay soil to 59.845 kN/m2 for clay soil with 15% coconut shell charcoal powder so that the coconut shell charcoal powder can be used as soil stabilization material.