Laboratory Investigation of Weak Subgrade Soil Modified with Cement Kiln Dust and Quarry Stone Dust as Stabilizer

The study deals with application of Cement Kiln Dust (CKD) and Quarry Stone Dust (QSD) as stabilizer to improve CBR of the weak subgrade soil. Laboratory experiments were conducted to determine the Particle size distribution, Atterberg’s limit, Compaction Characteristics, CBR and Unconfined compression strength test and Permeability test of nine test specimens prepared by mixing different combination of CKD (5%, 10% and 15%) and QSD (10%, 15%, and 20%) with 5% increment by dry weight. It is observed that CBR value increases with increment of CKD and QSD dosage. Percentage increase in CBR was noticed 78.25% in least and 401.23% in maximum for S1 (5% CKD & 10% QSD) and S9 (15% CKD & 20% QSD) respectively. Hence, CKD and QSD could be considered as the effective stabilizer and S9 can be considered as the best combination having maximum CBR value.