In this work, the effects of slag addition on the geopolymerization process and sulfate resistance of alkali-activated cement were studied. The substitution of metakaolin by slag increased the reactivity of precursors, contributing to a higher reaction rate and accelerating geopolymerization process. The mechanical properties and sulfate resistance were significantly improved with the incorporation of slag. The results show that the transformation of gel phases and development of pore structures were the vital reasons for improvement of sulfate resistance. The quantity of C-A-S-H generation increased with the slag content and consequently to a more compact microstructure. The refinement of pore structures came from the higher space-filling capacity of C-A-S-H phase and the filling effect of slag particles. The optimum replacement level of metakaolin was 30 wt%, in terms of sulfate resistance development and the potential damage of ettringite. This work provides a reference for the utilization of granulated blast furnace slag in metakaolin based geopolymer, which is of great value in urging geopolymer towards practical application in harsh environment.

在这项工作中，研究了炉渣添加对碱活化水泥的地质聚合过程和抗硫酸盐性的影响。用高炉渣代替偏高岭土可提高前驱体的反应性，从而有助于提高反应速率并加速地聚过程。炉渣的加入显着改善了机械性能和耐硫酸盐性。结果表明，凝胶相的转变和孔结构的发展是提高耐硫酸盐性的重要原因。CASH的产生量随炉渣含量的增加而增加，因此组织更加紧凑。细孔结构的细化来自于CASH相较高的空间填充能力和炉渣颗粒的填充效果。就硫酸盐抗性的发展和钙矾石的潜在损害而言，偏高岭土的最佳替代水平为30重量％。这项工作为偏高岭土基聚合物中粒化高炉矿渣的利用提供了参考，这对促使地质聚合物在恶劣环境中的实际应用具有重要价值。