偏高岭土基地聚合物反应机制与微结构研究  

Reaction mechanism and microstructure research of metakaolin-based geopolymer

作　　者：何真[1] 胡骏 王逢睿 李振 HE Zhen HU Jun WANG Fengruia LI Zhen(State Key Laboratory of Water Resources and H ydropower Engineering Science,Wuhan University, Wuhan 430072, China Wuhan Harbour Engineering Design and Research Co. ,Ltd. of CCCC,Wuhan 430040,China Northwest Research Institute Co. , Ltd. of China Railway Engineering Corporation, Lanzhou 730000,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]中交武汉港湾工程设计研究院,湖北武汉430040 [3]中铁西北科学研究院有限公司,甘肃兰州730000

出　　处：《武汉大学学报（工学版）》2017年第5期663-667,共5页Engineering Journal of Wuhan University

基　　金：国家重点基础研究发展规划(973计划项目)(编号:2015CB655101);中铁科技开发计划课题(编号:2013-重点-71)

摘　　要：对古建筑修复中使用的偏高岭土基地聚合物进行了XRD晶相分析和SEM形貌分析,结果表明,在短龄期内,水化反应与聚合反应同时进行,反应进行到一定程度后,水化反应逐渐停止,聚合反应成为主导.NMR核磁共振与FTIR红外光谱分析发现,地聚合反应发生时,偏高岭土中以多种配位形式存在的铝相均向四配位转化,且对称的Si-O-Si伸缩振动吸收峰偏移,变为非对称的伸缩振动,同时聚合反应后出现铝氧四面体内的振动吸收峰,表明铝氧四面体取代部分硅氧四面体,形成新的网络聚合结构.Metakaolin-based geopolymer, which is applied to the repair of ancient buildings, is studied by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The results show that within the short age, hydration and polymerization reacted simultaneously. However, the hydration reaction gradually stopped and the polymerization became dominant as the reaction progress. The nuclear magnetic resanance （NMR） and Fourier transform ifraved spectroscopy （FTIR） analysis have been taken on the raw material and reaction products; the results show that the coordination of aluminum changed from variety to uniform tetra-coordinated, and symmetrical Si-O-Si stretching vibration turned to asymmetrical. Meanwhile, vibration absorption peak of tetrahedrons appeared. It can be concluded that the SiO4 tetrahedron is partly replaced by A104 tetrahedron; thus, a new poly silicate-aluminum reticulate structure formed.

关 键 词：偏高岭土 聚合反应 微观结构 铝氧四面体 

分 类 号：TV49[水利工程—水工结构工程]