A Research On The Influence Factors And Mechanism Of CFRM Conductivity

As a new composite material, carbon fiber-reinforced cement mortar (CFRM) is widely gaining in importance due to its superior structural and functional properties, and has the potential to be used for structural health monitoring, traffic monitoring and the shield of electromagnetic wave.For engineering applications, certain fundamental questions need to be answered regarding the electrical properties of CFRM. In this thesis, some key issues such as the conductivity mechanism of CFRM and the effects of content of water, temperature, content of carbon fiber, voltage and stress are addressed and examined through experimental study. A modification is made on the theory of percolation and quantum mechanics tunneling effect, and an equivalent electrical circuit is presented to illustrate the conductivity of CFRM. A simple formula is derived to calculate the volume electrical resistivity of CFRM, which incorporates several important factors such as content of carbon fiber and the gap width between carbon fibers.