水热合成法制备偏高岭土-粉煤灰基地聚合物材料的研究

摘要

Zeolite-enhanced geopolymer were hydrothermal synthesized with sodium hydroxide as alkali activator,fly ash and metakaolin as raw materials. The influences of fly ash content,sodium hydroxide solution concentration,steam-curing temperature and steam-curing time on the mechanical properties of materials were discussed. The results show that different factors have different influence on the strength,with sodium hydroxide solution concentration most prominent. With the conditions of fly ash content of 50％,sodium hydroxide solution concentration of 10 mol/L,steam-curing temperature of 100℃ and steam-curing time of 24 hours,the strength of geopolymer can reach 47.5 MPa in three days. Amorphous silicon aluminum acid salt and zeolite were mainly generated in the product by XRD and SEM analysis,and different kinds of zeolites were synthesized at different hydrothermal synthesis process.%以氢氧化钠为激发剂,偏高岭土和粉煤灰为主要原料,采用水热合成法制备沸石增强型地聚合物材料,探讨粉煤灰掺量、氢氧化钠溶液浓度、蒸养时间、蒸养温度等因素对材料力学性能的影响.研究表明:不同因素对地聚合物强度的影响不同,其中以氢氧化钠溶液浓度影响最为突出;当粉煤灰掺量为50%,氢氧化钠溶液浓度为10 mol/L,在100℃下蒸养24 h,试样3d抗压强度达47.5 MPa;通过XRD和SEM分析可知,地聚合物样品主要为无定形的硅铝酸盐及沸石相,随着水热合成工艺条件的改变,生成的沸石类型不同.