水泥水化产物中，水化硅酸钙（C-S-H）凝胶是其中最重要的水化产物之一，它对水泥石和混凝土的性能起重要作用。目前对C-S-H凝胶的研究中，大多限于用XRD、DTA、SEM和化学分析的方法。本项目主要采用29Si、27Al固体NMR技术，对水泥水化浆体中C-S-H凝胶结构进行研究，系统研究C/S（钙硅比）对四面体结构的链长和聚合度的影响，探讨水泥石中Si4+存在的结构形式以及 Al3+在C-S-H凝胶结构中所起的作用，对水泥石孔结构、孔隙率、耐久性等因素与C-S-H凝胶聚合度相互关系进行深入研讨，研究硬化浆体中C-S-H凝胶聚合度由内到外的变化规律，建立C-S-H凝胶聚合度与水泥石性能以及径向深度（界面）之间的关系模型。 本研究将促进固体NMR技术在水泥化学中的应用，同时对C-S-H凝胶结构的研究提供一定的理论补充。

The C-S-H is one of the most important hydration products of cement, which plays an important role in the performance of cement and concrete. Much research have been done on the C-S-H structure, whilst most of them investigated the structure of C-S-H gel by the XRD、DTA、SEM and chemical analytical methods. The project is planned on the basis of the existing work, to carry out basic research of C-S-H structure investigated by the 29Si、27Al solid NMR technology. The effect of the different C/S of cement pastes on the C-S-H structure is studied; the kinds of Si4+ and Al3+ in cement paste are investigated. The relationship between the pore structure, porosity，durability and C-S-H gel polymerization degree is also discussed. Distribution of C-S-H gel polymerization degree in cement stone is studied to establish the C-S-H structure model of cement performance and radial displacement of C-S-H gel polymerization degree. The subject can provide a theoretical basis for further investigation of C-S-H structure.