Properties and interfacial microstructure of cement-based materials with composite micro-grains  

作　　者：冯奇 巴恒静 柳俊哲 

机构地区：[1]School of Municipal and Environmental Engineering Harbin Institute of Technology, Harbin 150090, China [2]School of Civil Engineering,Harbin Institute of Technology, Harbin 150090, China [3]School of Civil Engineering, Northeast Forestry University, Harbin 150040, China

出　　处：《Journal of Harbin Institute of Technology(New Series)》2005年第5期499-503,共5页哈尔滨工业大学学报（英文版）

摘　　要：Silica fume, fly ash and nano-fiber mineral materials (NR powder) are employed to incorporate into cement-based materials. According to the grain grading mathematical model of cement-based materials, two packing systems, namely, spherical grading system and nano-fiber reinforced system were designed. Properties and interfacial microstructure of the two systems were studied according to secondary interface theory. It was shown that nano-fiber mineral materials can improve the grain grading of the admixture, increase the density of the system, improve the microstructure of the interface and the hardened paste, and enhance the uniformity of cement-based materials mixed with composite micro-grains and greatly increase their wearable rigidity and flexure strength. In this paper, two kinds of interface models, including spherical grain model and nano-fiber reinforced interface model of the cement-based materials mixed with composite micro-grains, were brought forward.Silica fume, fly ash and nano-fiber mineral materials （NR powder） are employed to incorporate into cement-based materials. According to the grain grading mathematical model of cement-based materials, two packing systems, namely, spherical grading system and nano-fiber reinforced system were designed. Properties and interfacial microstructure of the two systems were studied according to secondary interface theory. It was shown that nano-fiber mineral materials can improve the grain grading of the admixture, increase the density of the system, improve the microstructure of the interface and the hardened paste, and enhance the uniformity of cement-based materials mixed with composite micro-grains and greatly increase their wearable rigidity and flexure strength. In this paper, two kinds of interface models, including spherical grain model and nano-fiber reinforced interface model of the cement-based materials mixed with composite micro-grains, were brought forward.

关 键 词：cement-based materials mixed with composite micro-grains compact packing system interface structure ideal model 

分 类 号：TU525[建筑科学—建筑技术科学]