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

Tuesday, 7 October 2014: 11:20
Expo Center, 1st Floor, Universal 15 (Moon Palace Resort)
C. P. Barrios (Universidad Autonoma de Sinaloa), R. E. Nuñez (Facultad de Ingeniería Mochis, Universidad Autónoma de Sinaloa (UAS)), M. J. Pellegrini (Centro de Investigación en Materiales Avanzados, Física de Materiales), J. H. Castorena (Facultad de Ingeniería Mochis, Universidad Autónoma de Sinaloa), and J. P. Garcia (Facultad de Ingeniería, Universidad Autónoma de San Luis Potosí)
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.