This study investigates the potential of using eggshell powder and quarry dust as alternative stabilizing agents for improving the engineering properties of lean clay soil. The objective is to develop a sustainable and cost-effective solution for subgrade enhancement in road construction, particularly in regions with limited access to traditional materials like lime or cement. contributes to chemical stabilization by providing calcium for cementitious reactions and improving soil structure, while quarry dust improves mechanical interlock and particle gradation. A comprehensive experimental program was conducted to evaluate changes in Atterberg limits, compaction characteristics, California Bearing Ratio, unconfined compressive strength, swell potential, and durability under wet-dry and freeze-thaw conditions. The results showed a marked improvement in strength, compaction efficiency, and moisture resistance, with a significant reduction in plasticity and swell behavior. The optimal mix of 6% eggshell powder and 30% quarry dust achieved the highest UCS and CBR values while demonstrating excellent durability. These findings highlight the feasibility of utilizing agricultural and construction waste materials in soil stabilization, offering both engineering benefits and environmental advantages for sustainable infrastructure development.
Alajlan et al. (Sat,) studied this question.