This study illustrates the significant influences of rice husk ash (RHA) addition on the mechanical properties, freezing resistance and microstructure of alkali-activated slag (AAS) material. The results indicate that the incorporation of rice husk ash enhanced the compressive strength, and reduced the mass loss percentage and compressive strength loss percentage during freeze-thaw cycles, improving the freezing resistance of hardened AAS pastes evidently. The primary reasons for this optimization are the synergistic functions from the potential filling effect of RHA particles and gels enrichment in nature and content of AAS samples. The former refined the capillary pores definitely and the later was responsible for the development of compressive strength. However, the excessive contents (more than 20%) of rice husk ash did make a side effect on the development of freezing resistance and microstructure of AAS samples, which was likely related to the structure of rice husk ash itself. The dosage of rice husk ash used in AAS should be within 20% when considering the achievement of better comprehensive properties.

这项研究说明了添加稻壳灰（RHA）对碱活化矿渣（AAS）材料的机械性能，抗冻性和微观结构的重大影响。结果表明，稻壳灰的掺入提高了冻融过程中的抗压强度，降低了质量损失率和抗压强度损失率，明显提高了固化AAS糊的抗冻性。进行此优化的主要原因是RHA颗粒的潜在填充效果以及AAS样品的性质和含量中富集的凝胶产生的协同功能。前者确实可以细化毛细孔，而后者则是产生抗压强度的原因。然而，稻壳灰的含量过高（超过20％）确实对AAS样品的抗冻性和微观结构产生了负面影响，这很可能与稻壳灰本身的结构有关。考虑到获得更好的综合性能，用于AAS的稻壳灰的用量应在20％以内。