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 the percolation threshold is governed by carrier hopping across the fiber-matrix interface. The activation energy is decreased by increasing the fiber crystallinity, but is increased by using intercalated fibers. The carbon fibers contribute to hole conduction. which is further enhanced by intercalation, thereby decreasing the absolute thermoelectric power and the resistivity. (C) 2001 Elsevier Science Ltd. All rights reserved.