This study investigates the enhancement of strength, durability, and shrinkage parameters of poorly graded silty sand through stabilization using local wastes. Brick kiln dust and rice husk ash were utilized as additives alongside cement as the primary stabilizer. The strength assessment included unconfined compressive strength and indirect tensile strength tests, while durability was evaluated through wet-dry cycles. Shrinkage effects were studied over a 28-day curing period in a humidity chamber maintained at constant relative humidity. Microstructural analysis involved particle size and elemental characterization of stabilized soil mixtures. Results demonstrate significant improvements in both strength and durability when using the admixtures. The combination of cement with brick dust and rice husk ash proved effective in enhancing the engineering properties of the silty sand. Specifically, the 7-day unconfined compressive strength results indicate potential for replacing granular sub-base layers in low volume road construction. In conclusion, the study recommends the use of brick kiln dust and rice husk ash as suitable admixtures for stabilizing poorly graded silty sand, offering sustainable solutions for infrastructure development with improved performance characteristics.
