尾泥微粉-粉煤灰-水泥复合胶凝体系性能研究

摘要/Abstract

摘要： 为了探究尾泥微粉在水泥基材料中应用的可行性,提高提锂尾渣资源利用率,利用提锂过程中产生的尾泥微粉与粉煤灰复掺后部分替代水泥,对尾泥微粉-粉煤灰-水泥复合胶凝体系的性能进行研究。结果表明:复掺适量提锂尾泥微粉与粉煤灰对复合胶凝体系流动性能有一定改善作用;复掺提锂尾泥微粉与适量粉煤灰部分替代水泥使得复合胶凝体系早期抗压强度略有降低,后期强度有明显增长。复掺5%(质量分数)提锂尾泥微粉与10%(质量分数)粉煤灰试验组的90 d抗压强度达到55.15 MPa,相比对照组提高了9.75%;复掺提锂尾泥微粉与粉煤灰在水化后期能够有效发挥复合活性效应与填充效应,促进水化产物生成并使其填充到大孔中,增加水泥浆体中毛细微孔(<10 nm)的比例,从而细化水泥浆体孔隙结构,提高体系致密度,宏观上表现为抗压强度增大。

关键词: 尾泥微粉, 粉煤灰, 流动度, 抗压强度, 孔结构, 水化进程

Abstract: In order to explore the feasibility of the application of tailings powder in cement-based materials and improve the utilization rate of lithium tailings resources, the performance of tailings powder-fly ash-cement composite cementitious system was studied by using tailings powder produced in the process of lithium extraction and fly ash to partially replace cement. The results show that the flow performance of composite cementitious system can be improved by adding an appropriate amount of lithium tailings powder and fly ash. The early compressive strength of composite system is slightly reduced by adding lithium tailings powder and an appropriate amount of fly ash to partially replace cement, but it later strength is significantly increased. Compared with the control group, the 90 d compressive strength of experimental group with 5% (mass fraction) lithium tailings powder and 10% (mass fraction) fly ash increases by 9.75%, reaching 55.15 MPa. In the later stage of hydration, the composite activity effect and filling effect can be effectively exerted by mixing lithium tailings powder and fly ash, which can promote the formation of hydration products and fill them into macropores, increase the proportion of capillary micropores (< 10 nm) in cement paste, so as to refine the pore structure of cement paste and improve the density of system. Macroscopically, the compressive strength increases.

Key words: tailings powder, fly ash, fluidity, compressive strength, pore structure, hydration process

中图分类号:

TQ172

李永清, 倪勇军, 李芳芳, 郭伟龙, 曹轩豪, 关博文. 尾泥微粉-粉煤灰-水泥复合胶凝体系性能研究[J]. 硅酸盐通报, 2024, 43(1): 236-245.

LI Yongqing, NI Yongjun, LI Fangfang, GUO Weilong, CAO Xuanhao, GUAN Bowen. Properties of Tailings Powder-Fly Ash-Cement Composite Cementitious System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 236-245.

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