Fly ash-based geopolymers incorporated with 2% nano-SiO₂ (NS)/nano-TiO₂ (NT) particles were subjected to microstructural and statistical nanoindentation analysis. With the addition of both types of nanoparticles, the compressive strength of geopolymer and the micromechanical properties of N-A-S-H gel were increased. NS exhibited higher reinforcement effect than NT on macro-strength. However, NT more significantly enhanced gel micromechanical properties. NT and especially the NS were found to have a positive effect on the early reaction rate of geopolymer. After 28 days, the gel proportion obtained by Backscattered electron (BSE) images analysis was close values of 49.16%, 55.69% and 54.02% for reference sample and NS, NT reinforced geopolymer, which were more than two times of that from the statistical nanoindentation. The effects of NS and NT on microstructure, gel proportion and gel micromechanical properties were discussed to reveal the macro-strength reinforcement mechanism. The results obtained from different techniques were also compared and discussed.

掺有2％纳米SiO ₂（NS）/纳米TiO _2的粉煤灰基地质聚合物（NT）颗粒经过微结构和统计纳米压痕分析。通过添加两种类型的纳米颗粒，地聚合物的抗压强度和NASH凝胶的微机械性能得以提高。NS在宏观强度上比NT表现出更高的增强作用。但是，NT更明显地增强了凝胶的微机械性能。发现NT，尤其是NS对地聚合物的早期反应速率具有积极影响。28天后，通过反向散射电子（BSE）图像分析获得的凝胶比例对于参考样品和NS，NT增强的地质聚合物的接近值分别为49.16％，55.69％和54.02％，是统计纳米压痕的两倍以上。NS和NT对微观结构的影响，讨论了凝胶比例和凝胶微机械性能，以揭示宏观强度增强机理。还比较和讨论了从不同技术获得的结果。