Smart Behavior of Carbon Fiber Reinforced Cement-based Composite  

作　　者：Wu YAO, Bing CHEN Keru WUState Key Laboratory of Concrete Materials Research, Tongji University, Shanghai 200092, China 

出　　处：《Journal of Materials Science & Technology》2003年第3期239-242,共4页材料科学技术（英文版）

基　　金：This work was supported by NSFC(No.59908007);a foundation for phosphor plan from the Science and Technology Committee of Shanghai Municipality(No.01QE14052);The financial support from the Foundation for the University Key Studies of Shanghai was also gratefully acknowledged.

摘　　要：The electrical characteristics of cement-based material can be remarkably improved by the addition of short carbon fibers. Carbon fiber reinforced cement composite (CFRC) is an intrinsically smart material that can sense not only the stress and strain, but also the temperature. In this paper, variations of electrical resistivity with external applied load, and relation of thermoelectric force and temperature were investigated. Test results indicated that the electrical signal is related to the increase in the material volume resistivity during crack generation or propagation and the decrease in the resistivity during crack closure. Moreover, it was found that the fiber addition increased the linearity and reversibility of the Seebeck effect in the cement-based materials. The change of electrical characteristics reflects large amount of information of inner damage and temperature differential of composite, which can be used for stress-strain or thermal self-monitoring by embedding it in the concrete structures.The electrical characteristics of cement-based material can be remarkably improved by the addition of short carbon fibers. Carbon fiber reinforced cement composite (CFRC) is an intrinsically smart material that can sense not only the stress and strain, but also the temperature. In this paper, variations of electrical resistivity with external applied load, and relation of thermoelectric force and temperature were investigated. Test results indicated that the electrical signal is related to the increase in the material volume resistivity during crack generation or propagation and the decrease in the resistivity during crack closure. Moreover, it was found that the fiber addition increased the linearity and reversibility of the Seebeck effect in the cement-based materials. The change of electrical characteristics reflects large amount of information of inner damage and temperature differential of composite, which can be used for stress-strain or thermal self-monitoring by embedding it in the concrete structures.

关 键 词：Carbon fiber Cement-based composite Smart material Seebeck effect 

分 类 号：TQ342.74[化学工程—化纤工业]