In this study, ground granulated blast-furnace slag (GGBS) was introduced as an additive to improve the setting and hardened properties of alkali-activated high-calcium FA binders at standard curing condition. FA was partially replaced by GGBS with contents of 0, 10%, 20%, 30%, 40% and 50% by mass to form a binary blends, which were then activated by an alkaline solution consisting of Na₂SiO₃ and NaOH to produce alkali-activated binders. The performance of alkali-activated high-calcium FA binders modified by GGBS were evaluated by multi-technical characterization. Moreover, the correlations between multiple properties were also analysed. The results show that adding GGBS as an additive could accelerate the setting times of alkali-activated high-calcium FA binders. The viscosity increases with an increase in GGBS content and is closely related to the flowability. Increasing GGBS content significantly improves the compressive strength of the paste sample, especially its early compressive strength, but makes the material more brittle. The sorptivity coefficient of hardened paste has a strong correlation with its compressive strength. In addition, the microcosmic improvement mechanism of GGBS as an additive was also discussed. The improvement in strength is owing to the generation of additional C-(A)-S-H gel in the presence of GGBS, which fills the pores in the matrix, transforming the large capillary pores into small gel pores, resulting in a denser and more uniform structure. The resulting decrease of threshold and critical diameters may be the main reason for the decrease of sorptivity coefficient.

在这项研究中，引入了磨碎的高炉矿渣（GGBS）作为添加剂，以改善标准活化条件下碱活化的高钙FA粘结剂的凝固和硬化性能。用质量分数为0、10％，20％，30％，40％和50％的GGBS部分取代FA，形成二元共混物，然后将其用由Na ₂ SiO ₃组成的碱性溶液活化和NaOH生成碱活化的粘合剂。通过多技术表征评估了GGBS改性的碱活化高钙FA粘合剂的性能。此外，还分析了多个属性之间的相关性。结果表明，添加GGBS作为添加剂可以加快碱活化高钙FA粘合剂的固化时间。粘度随着GGBS含量的增加而增加，并且与流动性密切相关。GGBS含量的增加显着提高了糊状样品的抗压强度，特别是其早期抗压强度，但使材料更脆。硬化糊的吸着系数与其抗压强度有很强的相关性。此外，还讨论了GGBS作为添加剂的微观改善机理。强度的提高是由于在存在GGBS的情况下生成了额外的C-（A）-SH凝胶，该凝胶填充了基质中的孔，将较大的毛细孔转变为较小的凝胶孔，从而导致更致密，更均匀结构体。阈值和临界直径的减小可能是吸附系数减小的主要原因。