摘要
为探明微波养护与不同组分碱激发粉煤灰胶凝材料(AAFA)的适应性,采用掺加偏高岭土或硅灰来调整原材料硅铝比的方法,研究微波养护时不同硅铝比AAFA试件的力学性能发展规律,并分析AAFA的聚合反应产物和微观结构.结果表明:与传统蒸汽养护相比,微波养护后硅铝比大于1.92的AAFA试件早期强度发展更快,但微波养护时间过长会使试件呈现明显的强度倒缩;硅铝比小于1.97的AAFA试件内部可生成较多的富铝水化铝硅酸钠(N-A-S-H)凝胶相,具备更为致密的微结构和更优异的高温稳定性,使其在微波养护阶段的最大抗压强度较高,同时可避免强度倒缩现象出现.
In order to explore the adaptability of microwave curing to alkali-activated fly ash cementitious materials(AAFA),the mechanical properties of AAFA with different Si/Al ratios were studied by adding metakaolin or silica fume to adjust the Si/Al ratio.The hydration products and microstructure of AAFA were analyzed.The results show that compared with the traditional steam curing,the early strength development of AAFA with Si/Al ratio greater than 1.92 after microwave curing is faster,but the specimen with too long microwave curing time will show significant strength shrinkage.More alumina rich N-A-S-H gel phases can be generated inside the AAFA specimens with Si/Al ratio smaller than 1.97,which yield more compact microstructure and better high temperature stability,so that the maximum compressive strength is higher during the microwave curing stage,and the phenomenon of strength reduction can be avoided.
作者
朱绘美
张煜雯
迂晨
乔沛
李辉
ZHU Huimei;ZHANG Yuwen;YU Chen;QIAO Pei;LI Hui(College of Materials Science and Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;Ministry of Education Ecological Cement Engineering Research Center,Xi′an University of Architecture and Technology,Xi′an 710055,China;Shaanxi Ecological Cement&Concrete Engineering Technology Research Center,Xi′an University of Architecture and Technology,Xi′an 710055,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2022年第6期558-564,共7页
Journal of Building Materials
基金
国家自然科学基金资助项目(51828201)
固废资源化利用与节能建材国家重点实验室开放资金资助项目(SWR‑2021‑009)。
关键词
碱激发粉煤灰胶凝材料
多级微波养护制度
硅铝比
力学性能
alkali-activated fly ash cementitious materials(AAFA)
multi-stage microwave curing regime
Si/Al ratio
mechanical property
