Our study is in the context of the valorization of the dredged sediments of Oued el fodda dam with the use of lime, natural pozzolan (NP), or the combination of both to improve the physical and mechanical properties of the studied silt. This investigation presents the influence of different mixing proportions of (0-8%) lime and (0-20%) NP on the consistency limits, compaction parameters, compressive strength and shear strength to the triaxial apparatus. From the results obtained, it can be concluded that the use of lime or the lime-pouzzolan combination showed significant effects on the development of physical and mechanical properties of the studied silt in the short and long term.