THE EFFECT OF BLOOD CLAM SHELL POWDER ADDITION ON SHEAR STRENGTH VALUE OF CLAY SOIL

Ground condition is an important aspect that influences performance under the load. An effort to overcome the load problem can be done by improving unstable soil through soil stabilization using blood clam shell powder. In order to determine the shear strength and changes in its value, it can be done by conducting the Triaxial UU test on a mixture of clay and blood clam shell powder with addition of 10%, 20%, 25%, and 30% of soil weight and 4% coal ash. Mixed soil was then stored in plastic for 24 hours to achieve evenly distributed moisture content. Laboratory testing was carried out with reference to ASTM (American Society for Testing and Materials) standards, aimed to calculate soil shear angle, cohesion, and soil shear strength values. The results showed that the addition of blood clam shell powder and coal ash increased the soil shear strength compared to the clay soil (without any addition). The highest shear strength value of 35,724 kPa was obtained by adding 25% blood clam shells.