The potentiality on alkali activation of volcanic tuff with calcium-based materials, fly ash, and their mixtures as additives were comprehensively investigated in this study. Several characterization strategies have been employed for mechanism exploration. CaO and fly ash (FA) brought about more dramatic responses than CaSO₄ and alkaline activator on activating the volcanic tuff-based geopolymer, which was relatively stable under the wet-dry alternated conditions. The symmetrical stretching vibration of Si–O–T (T = Al or Si) was right-shifted to the band at approximately 1036 cm⁻¹, implying the incorporation of Ca into Si–O–T. FA accompanying with CaO enhanced the polycondensation, gelation, and hardening of geopolymer. However, too many quartz balls brought into geopolymer paste by an excessive amount of fly ash deteriorated the cementing quality and reduced the mechanical strengths. This work contributes to the module usage of volcanic tuff in the construction industries and supplies an innovative method in activating geopolymerization.

本研究全面研究了钙基材料，粉煤灰及其混合物作为添加剂对火山凝灰岩的碱活化潜力。几种表征策略已用于机理探索。CaO和粉煤灰（FA）在活化火山凝灰岩基地质聚合物方面比CaSO ₄和碱性活化剂具有更显着的响应，而火山灰基地质聚合物在湿-干交替条件下相对稳定。Si–O–T（T = Al或Si）的对称拉伸振动在大约1036 cm ^-1处右移到带，意味着将Ca掺入Si–O–T中。伴随CaO的FA增强了地聚合物的缩聚，胶凝和硬化。但是，过多的粉煤灰将过多的石英球带入地质聚合物浆料中，会降低固井质量并降低机械强度。这项工作有助于在建筑行业中使用火山凝灰岩的模块，并提供了一种激活地聚的创新方法。