硅灰对新型地质聚合物胶凝材料力学性能影响的研究进展

硅灰是冶炼金属硅或硅铁合金过程中产生的主要固体废弃物。目前，对硅灰的资源化利用受到了广泛的关注。根据地质聚合物所使用原料的不同，简要综述了硅灰对粉煤灰和偏高岭土基地质聚合物力学性能的影响。通过对比分析发现，硅灰掺杂能有效促进地质聚合物中N-A-S-H相的形成，从而改善其力学性能。与偏高岭土相比，粉煤灰中惰性石英相含量较高，难以活化，因此对硅灰需求量较大，这对于实际工业应用具有重要的指导作用，也为硅灰固体废弃物的高附加值利用新思路提供理论基础。

Effects of Silica Fume on Mechanical Properties of Novel Geopolymer-Based Cementitious Materials: a Brief Review

Silica fume is the main solid waste in the production processes of metal silicon or ferrosilicon alloy. The recovery of silica fume waste has been highly concerned recently. This study presents a brief overview on the effects of silica fume on mechanical properties of fly ash and metakaolin-based geopolymers. It is found that the mechanical capacity of metakaolin or fly-ash-based geopolymers can be significantly improved by the addition of silica fume waste. The fly-ash-based geopolymer in most cases requires more silica fume than the metakaolin-based one since the presence of abundant inactive quartz phase in the previous one. The results show an important guidance for the practical industrial application，and also provides theoretical basis for high value-added recovery of silica fume waste.