微粉增强水泥基复合材料的早期界面显微结构研究

基金项目: 国家自然科学基金资助项目(50078019);哈尔滨工业大学校交叉学科基金资助项目(HIT.MD2001.10)

详细信息

STUDY ON INTERFACIAL MICROSTRUCTURE OF SUPERFINE POWDERS REINFORCED CEMENT BASED COMPOSITES AT EARLY AGE

School of Civil Engineering, Harbin Institute of Technology, Harbin 150006, China

摘要

摘要: 介绍了粉煤灰、硅灰、纳米SiO₂与水泥水化反应产物的早期界面显微结构,探讨了三种微粉与水泥水化反应的机理及对改善界面结构的作用,并提出了"二级界面"的概念。研究表明,三种微粉对界面的改善呈递增趋势,单一微粉中纳米SiO₂的水化产物结构最致密、均匀,微粉复合有效改善二级界面显微结构,有效提高水泥基材料性能。
- 二级界面 /
- 复合微粉 /
- 显微结构
Abstract: This paper describes interfacial microstructures of hydrated products of cement and three types of superfine powders, which are fly ash, silica fume and nano-SiO₂. Hydration mechanics of these three superfine powders and cement and their improvement of interfacial microstructures are researched also; therefore a concept of secondary interface is developed. The authors believe that these three superfine powders can improve interfacial microstructures and their effect degrees increased by fly ash, silica fume and nano-SiO₂. From the analysis of interfacial microstructures of hydrated products, the hydrated product of nano-SiO₂ is the densest and homogeneous when these three powders are used alone, and on the other hand, the hydration degree of mixture of these three powders shows much higher.
- secondary interface /
- superfine composite powders /
- microstructure particle