活性粉末复合胶凝体系的水化特性及微观结构  

Hydration characteristics and microstructure of compound cementitious system with reactive powder

作　　者：龙广成[1] 谢友均[1] 石明霞[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2007年第4期52-55,共4页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(50678174);湖南省科技计划项目(2006SK4017)

摘　　要：通过水化放热分析、差热分析、SEM以及BEI(Backscattering Electron Image)等手段对比研究了不同水胶比下活性粉末复合胶凝材料体系的水化放热特点、结合水含量以及水化产物特征;分析了胶凝体系水化硬化后的微观结构及其对宏观性能的影响规律,提出了相应的微观结构模型。结果表明:超低水胶比下活性粉末复合胶凝体系的水化放热速率非常低,约为同组成的普通胶凝体系的50%;体系的水化主要集中在早期;水化硬化后的体系主要包含CSH凝胶、未水化完全的水泥熟料颗粒和活性粉末,这些未水化完全的颗粒内核被致密的水化产物层包裹,从而大大提高了活性粉末复合胶凝体系硬化后的性能。The hydration process such as exothermic rate and bound water content and characteristics of hydration products of compotmd cementitious system with reactive powder were investigated using calorimetry, thermogravitymetric analysis, SEM and BEI. Microstructure of hardened cementitious system was analyzed and a microstructure model was presented. The results indicate that the exothermic rate in peak is only about half compared with cementitious system with water to binder ratio （w/b） of 0.42. The corresponding hydration velocity during 3 d is rapid. There are many unhydrated clinker particles and reactive powder in eementitious system, which are enwrapped by dense hydration products CSH layer, resulting in excellent properties in hardened system with reactive powder.

关 键 词：活性粉末 胶凝体系 水化 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]