利用同步辐射X射线小角散射研究超低水灰比水化水泥早期微结构  

Early Age Microstructure of Hydrating Cement with Ultra-Low Water to Cement Ratio Investigated by Synchrotron SAXS

作　　者：沈业青[1] 邓敏[2] 陆安群[2] 

机构地区：[1]安徽师范大学化学与材料科学学院,安徽省功能性分子固体重点实验室,安徽芜湖241000 [2]南京工业大学材料科学与工程学院,材料化学工程国家重点实验室,南京210009

出　　处：《硅酸盐学报》2012年第5期691-695,共5页Journal of The Chinese Ceramic Society

基　　金：高性能土木工程材料国家重点实验室开放基金(No.2010CEM018);国家重点基础研究发展计划(2009CB623105)资助

摘　　要：利用同步辐射X射线小角散射技术表征超低水灰比水泥水化早期产物分形结构,研究水化水泥早龄期微结构及演变。水泥水化早期水化产物双分形结构表明:水泥水化硅酸钙纳米凝胶颗粒随机堆积,内外层水化产物中纳米凝胶粒子结构分别具备不同的自相似性;内层水化产物中高密度凝胶堆积紧密,早龄期时随水化时间增加,堆积密度降低。外层水化产物中低密度凝胶堆积较为松弛,早龄期时随水化时间增加,堆积密度也在降低;水化诱导期生成结构最为致密的一层凝胶产物,诱导期后,凝胶产物层堆积密度随水化龄期的增加而减小,水化反应平缓后,凝胶堆积密度的演变也趋于平缓。Synchrotron small angle X-ray scattering（SAXS） was applied for non-destructive measure of fractal structure of hydrating cement.Early age microstructure of the cement with ultra low water to cement ratio was investigated.Fractal structure of the hydra-tion products indicates that nano C-S-H particles are packed randomly.Double fractal results from two types of structural self-similarity locating in the inner and outer hydration products respectively.Packing of the high density C-S-H within the inner hydra-tion productions is dense,and packing density degrease with hydration,while packing of the low density C-S-H within the outer hydra-tion productions is looser,and packing density also degrease with hydration.The densest packing of a layer of nano C-S-H particles is produced at the induction period of cement hydration.At acceleration period,packing density of the layer degreases with hydration of cement.However,evolution of packing density of the layer becomes flat after acceleration period of cement hydration.

关 键 词：同步辐射X射线小角散射 硅酸盐水泥 分形 微结构 早龄期水化 

分 类 号：TQ172.1[化学工程—水泥工业]