密封和饱水条件下养护的水泥硬化体纳米结构(英文)  

Nanostructure of Hardened Cement Compacts Cured Under Sealed and Saturated Curing Conditions

作　　者：沈业青[1] 邓敏[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12期1699-1702,共4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(2010CEM018);国家重点基础研究发展计划(2009CB623105)资助项目

摘　　要：采用毛细吸水的方法可重复制备压实水泥水化硬化体;测量了用以表征水泥水化程度的化学收缩;利用小角X射线散射技术获得了水化硅酸钙纳米凝胶颗粒的堆积结构分形维数;研究了不同养护条件下制备的水泥硬化体分形结构。结果表明:密封养护的水泥硬化体10 d龄期水化程度与饱水养护的水泥硬化体相同;而饱水养护的水泥硬化体10 d龄期时其纳米凝胶结构的分形维数明显低于密封养护的水泥硬化体。同步辐射小角X射线散射技术可探测到密封养护的水泥硬化体由于水化产生的自干燥现象,以及由此引起的纳米凝胶颗粒紧密堆积,该技术为水泥基材料自收缩性能的微观机制研究提供了技术手段。Hydrated cement compacts were repeatedly prepared via capillary absorption. The chemical shrinkage was measured to characterize the hydration degree of the cement in the compacts. The fractal dimension was detected to distinguish the packing behavior of the nanoparticles of C-S-H gel by small-angel X-ray scattering （SAXS） technique. The fractal structure of hardened cement compacts cured under different conditions was investigated. The results show that the hydrated compacts cured under the saturated condition have the same hydration degree as that under the sealed condition at the age of 10 d. The fractal dimension of nanoparticles of C-S-H gel in the saturated compacts is less than that in the sealed compacts at 10 d. The dense packing of nanoparticles of C-S-H gel due to the auto-desiccation in the nanostructure of sealed compacts was found by synchrotron SAXS. This technique could provide some information for the research on the micro-mechanisms ofautogenous shrinkage in cement based materials.

关 键 词：水泥硬化体 纳米结构 分形维数 养护条件 

分 类 号：TQ172.1[化学工程—水泥工业]