Sediments from dredging works are increasingly used in the building and construction industry. One of the major difficulties of sediment valorization resides notably in the very heterogeneous composition of its fine particles. This paper focused on the rheological impacts caused by the use of uncontaminated raw marine sediment (RS) in Self-Compacting Concrete (SCC). The Densified Mixture Design Algorithm (DMDA) was used to optimize RS as a raw material in the granular structure of the SCC. The AFREM grout method was used to determine the saturation dose of the superplasticizer. The rheological tests were carried out to assess the influence of fine RS particles on the workability of SCC. The stability of SCC was found to be correlated with the high percentage of fine particles less than 125 μm present in the RS. The fine nature of clays and the organic matter caused the increase in yield stress and plastic viscosity. The rheological tests were carried out to assess the influence of fine RS particles on the workability of SCC. The stability of SCC was found to be correlated with the high percentage of fine particles less than 125 μm present in the RS