用^(27)Al MAS NMR分析铝掺杂水化硅酸钙结构中铝的配位状态（英文）  

^(27)Al MAS NMR Studies on Location of Aluminum in Substituted Calcium Silicate Hydrate

作　　者：吕林女[1,2] 何永佳[2,3] 何满倩 胡曙光[2,3] 

机构地区：[1]武汉理工大学理学院,武汉430070 [2]武汉理工大学,硅酸盐建筑材料国家重点实验室,武汉430070 [3]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐学报》2017年第8期1096-1100,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(No.51272193,51372183,U1305245);国家重点研发计划项目(No.2016YFB0303501)

摘　　要：制备了具有宽范围Ca/(Si+Al)比和Al/Si比的铝掺杂水化硅酸钙(C-A-S-H)系列样品,采用^(27)Al魔角旋转固体核磁共振技术(^(27)Al MAS NMR)半定量研究了Al在C-A-S-H结构中的配位状态。结果表明:Al在C-A-S-H结构的配位形式和位置主要取决于其初始Ca/(Si+Al)比和Al/Si比。当初始Ca/(Si+Al)比低时(0.6和0.8),Al只能取代硅酸盐链硅氧四面体结构中四配位的Si,以Al[4]的形式存在;随着Ca/(Si+Al)比的增加,部分Al开始形成Al[5]和Al[6],且随着Al/Si比的增加,Al[4]的含量减小,Al[5]和Al[6]的总量增加,但Al[4]还是占主要比例,Al[5]的量非常少。Al[4]既可取代桥四面体中的Si也可取代配对四面体中的Si,但优先取代的是桥四面体中的Si,两者取代比并非恒定,而是随着初始Ca/(Si+Al)比和Al/Si比的变化而变化。Aluminum-substituted calcium silicate hydrate （C-A-S-H） series with various ratios of Ca/（Si＋AI） and Al/Si were prepared. The Al incorporation in C-S-H structure was semi-quantitatively investigated by 27Al magic angle spinning nuclear magnetic resonance （27Al MAS NMR）. The results show that the possible site and content of Al in C-S-H structure mainly depend on initial ratios of Ca/（Si＋A1） and Al/Si. At low ratios of Ca/（Si＋Al） of 0.6 and 0.8, A1 only substitutes 4-coordinated Si in the silicate chains. Some A1 starts to form Al[5] and Al[6] as Ca/（Si＋Al） ratio increases, and the content of Al[4] decreases, but Al[4] is still dominant and Al[5] is rather limited as Al/Si ratio increases. Al can substitute Si in both bridging and pairing sites, Al-Si substitution takes priority in bridging site, and the ratio of the Al number in bridging site to that in pairing site depends on the initial ratios of Ca/（Si＋A1） and Al/Si.

关 键 词：结构 铝取代 水化硅酸钙 ^27Al魔角旋转固体核磁共振技术 

分 类 号：TU528.01[建筑科学—建筑技术科学]