Effect of carbon fiber grade on the electrical behavior of carbon fiber reinforced cement

Electrical conduction in cement reinforced by short cal bon fibers below th e percolation threshold is governed by carrier hopping across the fiber-mat rix interface. The activation energy is decreased by increasing the fiber c rystallinity, but is increased by using intercalated fibers. The carbon fib ers contribute to hole conduction. which is further enhanced by intercalati on, thereby decreasing the absolute thermoelectric power and the resistivit y. (C) 2001 Elsevier Science Ltd. All rights reserved.