常温下碱-晶种复合激发粉煤灰胶凝材料的性能  

Properties of Alkali-Seed Activated Fly Ash Binder at Room Temperature

作　　者：朱绘美 武幸子 刘毓 李辉[1] ZHU Huimei;WU Xingzi;LIU Yu;LI Hui(College of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《硅酸盐学报》2025年第2期289-303,共15页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(52308278,52172028);陕西省重点研发计划项目(2023-YBGY-498);陕西省教育厅科学研究计划重点项目(23JY044)。

摘　　要：碱激发粉煤灰胶凝材料具有优异的抗腐蚀、耐高温和固化重金属等性能,且粉煤灰利用率高、生产过程绿色化,但其常温养护下凝结硬化十分缓慢,限制了工程应用。因此,本工作合成一系列不同特性的碱-晶种复合激发剂,并制备碱-晶种复合激发粉煤灰胶凝材料(ASAFA),探究其常温性能和结构的演变规律。结果表明,碱-晶种复合激发剂中的晶种是高聚合度的N-A-S-H凝胶和沸石(方钠石、钠-菱沸石等),两者的含量和比例搭配是影响激发效果的重要因素。通过调整原料活性、反应温度和时间,可以增加复合激发剂中N-A-S-H凝胶和沸石的总含量,并且提高沸石类物相的比例,进而诱导地聚合反应产物在ASAFA体系内加速、均匀生长,降低硬化体中的有害孔比例,促进ASAFA的凝结硬化进程和抗压强度。Introduction Alkali-activated fly ash cementitious materials are characterized by several advantageous properties,including corrosion resistance,high-temperature resistance,and the ability to solidify heavy metals.Additionally,these materials demonstrate a high utilization rate of fly ash and are produced through an environmentally friendly process.Despite these benefits,a significant limitation is their slow solidification and hardening at room temperature,which restricts their practical engineering applications.Consequently,alkali-seed composite activated solutions were used to prepare alkali-seed composite excitation fly ash(ASAFA)specimens,and their properties and structural evolution were explored.The results indicated that N-A-S-H gel and zeolite(sodaliteand chabazite-Na)were the main components of alkali-seed composite activated solution,and their proportion played a crucial role in determining the excitation effect.Through adjustments in the activity of raw materials,reaction temperature and duration,it is possible to increase the total content and proportion of N-A-S-H gel and zeolite in the seed,thereby encouraging accelerated and uniform growth of the reaction products within the ASAFA system,and reducing the proportion of harmful pores in the hardened structure.As a result,the setting and hardening process and compressive strength of ASAFA was promoted.Methods The study utilized first-class fly ash(FA1)with a specific surface area of 430 m~2/kg as the primary raw material.FA1 was subjected to sorting-roller grinding to achieve specific surface areas of 715 m~2/kg and 1014 m~2/kg,resulting in the production of FA~2and FA3,respectively.The activity of the three types of fly ash was assessed in accordance with GB/T 1596-2005"Fly Ash Used in Cement and Concrete."The results indicated that the mechanical activation from the grinding process significantly enhanced the activity of FA2 and FA3 at all ages compared to FA1,with activity values at 28 days reaching 92%and 114%,respectively.An 8mol/L NaOH solution

关 键 词：碱 晶种 复合激发 粉煤灰 常温养护 

分 类 号：TU526[建筑科学—建筑技术科学]