The variation of water content significantly affects the strength development of stabilized dredged sludge (DS), as well as the rational use of binder. This paper experimentally studies the strength and microstructure evolutions of DS stabilized with alkali-activated ground granulated blast-furnace slag (GGBS) under different water contents, via a range of unconfined compressive strength (UCS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests. The sodium hydroxide (SH) and sodium silicate (SS) were used as single and composite activators for GGBS, and their roles on the stabilization efficacy were mainly focused. The results illustrated that the optimum single activator content tended to increase with the increase of water content. Composite activators were more effective than single activator in activating GGBS for achieving higher UCS of stabilized DS. The optimum mass ratio of SH to SS (H/S) in composite activators was 2/3, 2/3 and 1/4 at water content of 60, 70 and 80%, respectively. The linear empirical equations for predicting 60- and 90-day UCS based on 28-day UCS were proposed. XRD and SEM results confirmed that calcium silicate hydrate and calcium aluminate hydrate were the major hydrations, which undertook the cementation and filling roles. Furthermore, the micro-mechanisms revealing the strength evolutions of stabilized DS were analyzed and discussed. The results recommended that using 20% SH/SS-GGBS binder with optimum H/S of 2/3, 2/3 and 1/4 as the substitute of equivalent PC for stabilizing DS with water content of 60, 70 and 80%, respectively.

含水量的变化显着影响稳定的疏dr污泥（DS）的强度发展，以及粘结剂的合理使用。本文通过一系列无侧限抗压强度（UCS），X射线衍射（XRD）和扫描测试，研究了碱活化磨碎的高炉矿渣（GGBS）在不同含水量下稳定的DS的强度和微观结构演变。电子显微镜（SEM）测试。氢氧化钠（SH）和硅酸钠（SS）分别用作GGBS的单一和复合活化剂，它们在稳定功效方面的作用主要集中在此。结果表明，随着水含量的增加，最佳的单一活化剂含量趋于增加。复合活化剂在活化GGBS方面比单一活化剂更有效，以获得更高的稳定DS的UCS。复合活化剂中SH与SS的最佳质量比（H / S）在水含量分别为60％，70％和80％时分别为2 / 3、2 / 3和1/4。提出了基于28天UCS的60天和90天UCS的线性经验方程。XRD和SEM结果证实水合硅酸钙和铝酸钙是主要的水合产物，它们承担了胶结和填充作用。此外，分析和讨论了揭示稳定DS强度演变的微观机制。结果建议使用最佳H / S为2 / 3、2 / 3和1/4的20％SH / SS-GGBS粘合剂代替等效PC来稳定水含量分别为60％，70％和80％的DS，分别。