Performance Evaluation of Lateritic Subgrade Soil Treated with Lime and Coir Fibre-Activated Carbon

The subgrade layer’s stability considerably influences the long-term performance of pavement systems. This study investigates influence lime as a traditional stabiliser and activated carbon with coir fibre (ACF) waste materials an environmentally friendly binder to stabilise lateritic soil. Experiments, including one-dimensional consolidation unconfined compressive strength (UCS) tests, have been conducted investigate geotechnical properties stabilised soil in various percentages additives 3%, 6%, 9%, 12% 1%, 2%, 3% ACF. results demonstrate that ACF can significantly improve parameters decrease void ratio permeability Furthermore, microstructural analysis was performed before after stabilisation for optimum content. proves AC particles fill voids, gel formation binds matrix. show is comparable UCS value decreasing ratio. both are suitable low-volume road according Malaysian standards.