中文摘要：

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。^27Al魔角旋转固体核磁共振技术（^27AlMASNMR）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＋A1）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。

英文摘要：

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.