Shear Strength Improvement of Clay Soil Stabilized by Coffee Husk Ash

Finding alternatives to natural resources is important for a sustainable future and essential infrastructure projects. Among these replacements the use of coffee waste as soil stabilizers. Coffee husk ash (CHA) solid obtained by processing beans on farm or factory. The main aim this study determine geotechnical properties clay treated with CHA develop low-cost, environmentally friendly alternative composition. Laboratory tests were conducted investigate influence physical mechanical clay. concentration was adjusted from 5% 25% dry weight in increments. classification mixture becomes coarser following addition CHA. At CHA, peak UCS 130.83 kN/m2 measured compared untreated 89.17 kN/m2. In addition, cohesion values internal friction angles 0% increased 80.1 148.7 16.1° 25.8°, respectively. It found that can improve strength forming pozzolanic hydration process fills voids binds particles together.