Electrical Characterization of a Cement Paste with Carbon Fiber by Electrochemical Impedance Spectroscopy

In this work is presented a methodology to determine the electrical conductivity percolation threshold for a cement paste added with graphite powder (with size maximum particle 1mm) and carbon fiber (10mm length by 7.2 mm in diameter).  For graphite cement ratio of 1:1 and different volumetric fraction of carbon fiber (0-1.2%). the electrical conductivity of the cement paste is obtained by two techniques: four point method (4P, DC) and Electrochemical Impedance Spectroscopy (EIS AC). The electrical conductivity of cement paste specimens with different percentage of carbon fibers shows a percolation threshold of 0.27% of carbon fiber weight.