Study on Conductive Mechanism of Carbon Fiber Filled Cement-Based Composites

Abstract:

In order to investigate conductive mechanism of carbon fiber filled cement-based composites, the conductive properties of cement paste, carbon fiber filled cement-based composites containing different contents of carbon fibers or aggregates were studied. Experimental results indicate that the electrical resistance of the plain cement paste obviously increases with hydration time, which results from the ionic conduction in strong electrolyte solution. The electrical resistivity of the carbon fiber filled cement-based composites decreases with the increase of fiber content. Both contacting conduction and ionic conduction are in charge of the electrical conduction in these composites. The electrical resistivity of the carbon fiber filled cement-based composites decreases under compression, which is due to the improvement of interface contact between matrix and fibers and the increase of fiber bridging probability. The fiber pull-out and breaking under tension lead to an increase in electrical resistivity of these composites. Aggregates block fiber dispersion and contact. This causes an increase in electrical resistivity of the composites.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1435-1438
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1435
• Online since: December 2011
• Authors: Xue Li Nan, Xiao Min Li
• Keywords: Carbon Fiber (CF), Cement-Based Composite, Conductive Mechanism, Electrical Resistance

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