Abstract：This paper systematically studied the effects of Si/Al and Na/Al on the setting time of low-calcium fly ash-based geopolymers under different water-binder ratios. Through scanning electron microscopy analysis, the effect of element ratio on the setting time of low calcium fly ash-based geopolymers was explained at the microscopic level. The results show that the initial and final setting times of low calcium fly ash-based geopolymers increase with the increase of the water-binder ratio. Under the conditions of different water-binder ratios, the initial and final setting times of low calcium fly ash-based geopolymers decrease with the increase of Si/Al, but increase with the increase of Na/Al. Compared with Na, Si element has a more significant effect on the setting time of geopolymers during the coagulation process. When the water-binder ratio is 0.45, Si/Al is 2.0 and Na/Al is 2.3, the initial and final setting times of the geopolymer are 49 min and 109 min respectively, and the setting time is better at this time.
王子杰, 黄义雄, 熊 龙, 郭玉林, 刘佳益, 王振林, 郭 勇. 钠、硅对低钙粉煤灰基地质聚合物凝结时间的影响[J]. 水泥杂志, 2025, 0(12): 5-.
WANG Zijie, et al. Influence of sodium and silicon on setting time of low-calcium fly ash-based geopolymer. Journal of Cement, 2025, 0(12): 5-.
2025, Vol. 0 
