International Research Journal of Education and Technology

The long-term performance of pavement structures is significantly influenced by the stability of the sub-base and base soil layers. Stabilizing these soil layers can enhance their properties and overall strength, ensuring better durability and performance of the pavement. In India, black cotton soil constitutes the fourth largest soil group and is characterized by its porous and fragile structure, which contributes to its relatively lower strength compared to other soil types. Additionally, black cotton soil has a high swelling capacity, making it more susceptible to volume changes and stability issues. Therefore, stabilizing black cotton soil is crucial to improve its suitability for use in pavement construction. The stabilization of black cotton soil using construction and demolition waste holds significant potential for improving the performance of pavement structures. By increasing the CBR value, the strength and durability of the sub-base and base layers are enhanced, leading to a reduction in pavement thickness and overall construction costs. This study contributes to the broader field of sustainable engineering by integrating waste materials into soil stabilization processes.

Keywords: High swelling capacity Black cotton soil, Fly ash, California bearing ratio, Sub-base, Base layers, Swelling Capacity