CFRC中碳纤维长度分布规律研究  

Research on Length Distributions of Carbon Fibers in CFRC

作　　者：朱录涛[1] 张晖[2] 

机构地区：[1]襄樊学院建筑工程学院,湖北襄樊441053 [2]武汉纺织大学机电工程学院,武汉430073

出　　处：《武汉理工大学学报》2010年第18期33-36,共4页Journal of Wuhan University of Technology

摘　　要：以羧甲基纤维素钠(CMC)和硅灰为碳纤维分散剂配制了碳纤维水泥基复合材料(CFRC),通过酸洗、多次过滤等从新拌CFRC料浆中将碳纤维分离出来,以分析碳纤维在CFRC中的长度分布规律。研究表明,碳纤维完全以单根纤维形式分散在水泥基体中,碳纤维在CFRC中以2 mm以下的短小纤维数量最多,而且在全部碳纤维中所占的体积分数为45%。这些短小碳纤维的长度低于纤维从水泥中拔出的临界长度,使得CFRC的电阻随载荷而变化。CMC的表面润滑作用、分散剂体系的粘性、硅灰填充效应和特别的湿拌-干湿拌-湿拌工艺有利于碳纤维在水泥基体中的分散。Carbon fiber reinforced cement matrix composites（CFRC） is prepared using sodium carboxymethyl cellulose（CMC） and silica fume as the dispersing agents to disperse short carbon fibers.Through the acid washing and multi-filtration,carbon fibers are separated from the new-mixed CFRC slurry.Research has shown that carbon fibers are dispersed entirely in the form of a single fiber in the cement matrix,the length of most of carbon fibers is less than 2mm.And most of carbon fibers are less than the critical length.These fibers will be pulled out from the cement during loading,which is an important role for the piezoresistive effect of CFRC.The surface lubrication effect of CMC,viscosity of dispersant system, filling effect of silica fume and the mixing process all are favorable to dispersion of carbon fibers in cement matrix.

关 键 词：碳纤维 机敏混凝土 长度分布 分散性 

分 类 号：TU528[建筑科学—建筑技术科学]