摘要
研究了含有碳纤维、石墨、钢纤维的水泥基材料的导电性及其在压应力作用下电阻率的变化规律;探讨了掺有导电掺合料的水泥石电阻率的变化机理。研究表明,水泥基材料具备压敏效应的前提条件是其导电网络达到渗流区,而碳纤维由于长径比大、密度小,极小掺量即可使水泥石进入渗流区,产生压敏效应。
The electrical conductivity and its specific resistance varying with compressive stress of cement based composite materials (CBCM),reinforced by carbon fiber, black lead and steel fiber, were studied. The changing mechanism of specific resistance of CBCM,mixed with electric admixtures, was also researched. The results show that the precondition of CBCM possessing the piezoresistive effect is its electric net reaching the vadose zone. Moreover, due to the carbon fiber possessing a character of high slenderness ratio and low density, only a small content of it is enough to make CBCM enter the vadose zone and possess the piezoresistive effect.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2004年第3期137-141,共5页
Acta Materiae Compositae Sinica
基金
国家自然科学基金重点项目(50238040)
"863"计划项目(2002AA335010)
关键词
导电掺和料
压敏效应
电阻率
electric admixtures
piezoresistive effect
specific resistance
