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.

中文翻译：

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海洋沉积物掺入对碱活化 GGBFS 行为的影响

本研究涉及使用碱活化磨碎的高炉矿渣 (GGBFS) 和未煅烧的疏浚沉积物的细粒开发新型粘合剂。在两种水/固比（0.45 和 0.62）下研究了沉积物的掺入（质量的 23%）对水化热、坍落度流动和机械性能的影响。结果表明，在碱活化剂中不存在硅酸盐的情况下，除了反应动力学和凝固时间变慢之外，添加沉积物保持了与没有沉积物时获得的机械强度相当的机械强度。而当将 23% 的沉积物添加到硅酸盐活化系统时，抗压强度降低，反应动力学减慢。混合物中沉淀物的存在不会影响糊状物的初始凝固时间。而在 W/S = 0.62 时，注意到机械性能的损失，凝固时间和反应动力学减速。在没有沉积物的情况下对 GGBFS 的测试表明，含水量的增加（W/S 从 0.45 增加到 0.62）对粘合剂力学性能的影响大于沉积物的掺入，但沉积物的存在会影响凝结时间超过 W/S 增加。这些结果表明，系统中水量的控制允许开发具有良好机械性能和调节凝固时间的碱活化材料。62) 对粘合剂的机械性能的影响大于沉积物的掺入，但沉积物的存在对凝结时间的影响大于 W/S 的增加。这些结果表明，系统中水量的控制允许开发具有良好机械性能和调节凝固时间的碱活化材料。62) 对粘合剂的机械性能的影响大于沉积物的掺入，但沉积物的存在对凝结时间的影响大于 W/S 的增加。这些结果表明，系统中水量的控制允许开发具有良好机械性能和调节凝固时间的碱活化材料。