粉煤灰的粒度分形评价及颗粒特征分析  

Fractal Evaluation for the Particle Size of Fly Ash and Grain Properties Analysis

作　　者：刘锦子[1] 高英力[2] 周士琼[3] 胡显燕[1] 

机构地区：[1]湖北第二师范学院,武汉430205 [2]武汉理工大学硅酸盐材料工程教育部重点实验室,武汉430070 [3]中南大学土木建筑学院,长沙410075

出　　处：《国外建材科技》2007年第4期33-36,共4页Science and Technology of Overseas Building Materials

摘　　要：针对不同细度的粉煤灰,引入分形理论探讨了粉煤灰的粒度分布特征,在激光粒度分析试验的基础上,计算了其各自相应的分形维数,证明了其不失为一种较好的评价粉体粒度特征的理论方法;同时对其颗粒性状如:在水泥基材料中的密实填充效应、颗粒形貌等进行了系统的试验研究,结果表明:70%水泥和30%超细粉煤灰颗粒混合相比于纯水泥颗粒能更好的满足Horsfield理想填充,而其特有的形貌特征使其在水泥基材料中具有较好的减水增强效应。For the different fineness fly ash, fractal theory was used to research the particle distribution character of fly ash, and calculating fractal dimensions respectively according to the test of laser particle size analysis. So the fractal theory is approved as a better method of evaluating powder＇s particle character. Meanwhile the classing fly ash＇s grain properties such as dense packing effect in cement-based materials and particle morphologies were tested, the results indicated that the packing structure of 70 % cement and 30% ultra-fine fly ash meets Hosfield＇s perfect packing structure better than that of pure cement particle, and its specific shape character provide the better effects of water reducing and strength increasing for fly ash applying in cement-based material.

关 键 词：粉煤灰 分形 粒度分析 颗粒形貌 

分 类 号：TU528.041[建筑科学—建筑技术科学]