硅酸盐学报2017，Vol.45Issue(8)：1096-1100,5.DOI:10.14062/j.issn.0454-5648.2017.08.07
用27Al MAS NMR分析铝掺杂水化硅酸钙结构中铝的配位状态
27 Al MAS NMR Studies on Location of Aluminum in Substituted Calcium Silicate Hydrate
摘要
Abstract
Aluminum-substituted calcium silicate hydrate (C-A-S-H) series with various ratios of Ca/(Si+Al) 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+Al) and Al/Si.At low ratios of Ca/(Si+Al) of 0.6 and 0.8,Al only substitutes 4-coordinated Si in the silicate chains.Some Al 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+Al) 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Key words
structure/aluminum-substituted/calcium silicate hydrate/27Al magic angle rotating solid nuclear magnetic resonance technology分类
土木建筑引用本文复制引用
吕林女,何永佳,何满倩,胡曙光..用27Al MAS NMR分析铝掺杂水化硅酸钙结构中铝的配位状态[J].硅酸盐学报,2017,45(8):1096-1100,5.基金项目
国家自然科学基金项目(No.51272193,51372183,U1305245) （No.51272193,51372183,U1305245）
国家重点研发计划项目(No.2016YFB0303501). （No.2016YFB0303501）
