This study deals with the development of a new binder using alkali-activated ground granulated blast furnace slag (GGBFS) and the fine fraction of non-calcined dredged sediments. The effects of sediment’s incorporation (23% in mass) on hydration heat, slump flow and mechanical properties are studied at two water/solid ratios (0.45 and 0.62). The results show that in absence of silicates in the alkali-activator, the addition of sediments maintains mechanical strengths comparable to those obtained without sediments except that reaction kinetics and setting times are slowed down. Whereas when adding 23% of sediments to the silicate activated systems, compressive strength decreases and reaction kinetics is slowed down. The presence of sediments in the mixture does not affect the initial setting time of the paste. Whereas at W/S = 0.62, a loss in the mechanical behavior is noted, the setting times and the kinetics of the reaction are decelerated. Tests on GGBFS in the absence of sediments showed that it’s the increase of water content (W/S increase from 0.45 to 0.62) that affects the mechanical properties of the binders more than sediment’s incorporation, but it’s the presence of sediments that affects the setting times more than W/S increase. These results show that the control of the quantity of water in the system allows the development of alkali-activated materials with good mechanical performance and regulated setting time.