The use of high-volume ground granulated blast furnace slag (GGBFS) in cement-based materials significantly reduces CO₂ emissions. Nevertheless, low curing temperatures are barriers to using environmentally friendly materials in winter construction works. This is mainly attributed to slow GGBFS's reactivity and blends' strength development due to the low alkalinity offered by the slow hydration rate of Portland cement (PC) at low temperatures. In this study, sodium hydroxide was employed to produce dry reactive pre-alkali-activated GGBFS (A-GGBFS), with an intention to increase the system's alkalinity and reactivity. The blended cement paste was prepared with 50% PC replacement with untreated and treated GGBFS, and cured constantly at 0 °C for 28 days. The A-GGBFS accelerated the hydration rate and enhanced the precipitation of hydration products. By adding an optimal NaOH content during the pre-alkali-activation process, the 3 and 28 days compressive strengths of paste increased by 41% and 37%, respectively, gaining a comparable 28 days compressive strength to that measured in a 100% PC-based binder. The microstructural assessments are consistent with compressive strength measurements.

在水泥基材料中使用大量磨碎的粒状高炉矿渣 (GGBFS) 可显着降低 CO ₂排放。然而，低固化温度是在冬季建筑工程中使用环保材料的障碍。这主要归因于由于波特兰水泥 (PC) 在低温下缓慢水化速率提供的低碱度，GGBFS 的反应性和混合物的强度发展缓慢。在这项研究中，氢氧化钠用于生产干反应性预碱活化 GGBFS (A-GGBFS)，旨在提高系统的碱度和反应性。用未处理和处理过的 GGBFS 替代 50% PC 制备混合水泥浆，并在 0°C 下持续固化 28 天。A-GGBFS 加速了水化速率并增强了水化产物的沉淀。通过在预碱活化过程中添加最佳 NaOH 含量，浆料的 3 天和 28 天抗压强度分别提高了 41% 和 37%，获得的 28 天抗压强度与 100% PC 基粘合剂中测得的相当。微观结构评估与抗压强度测量结果一致。