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Journal Articles
Experimental Study on the Electro-Thermal Behavior of Conductive Concretes with Carbon Black and Carbon Fiber-Carbon Black
Pages: 449-457
Year: Issue:  3
Journal: Journal of Shenyang Jianzhu University(Natural Science)

Keyword:  carbon blackcarbon fiberconductive concreteelectrical resistivityelectric heating behavior;
Abstract: For developing newfunctional materials which could be used for snow-melting,deicingand indoor heating,electrical conductivities and electric heating effects of conductive concretes with carbon black and diphasic carbon fiber-carbon black were studied. Two kinds of cubic concrete specimens were made with electrodes inside and connected into direct current circuit to observe heat effects. Electrical resistivities of the specimens were measured along with different concrete ages,and the corresponding electrical conductivities of the two kinds of materials were compared and analyzed,taking into account of influences of carbon fiber on electrical conductivity. It is found that the conductive behavior of diphasic carbon fiber-carbon black concrete is better that that of carbon black concrete. Concrete specimens with 1% carbon black and 2% carbon fiber have electrical resistivities less than 100 Ω·cm. The change of heating rate of both kinds of conductive concrete is stable and the heating effect is well. The electrical resistivity change of the carbon black concrete is more stable with time extending. But for carbon fiber-carbon black diphasic conductive concrete,it is influenced by polarization. Conclusion is that in contrast with the carbon black concrete,conductivity of the carbon fiber-carbon black diphasic concrete is better,but the stability of its electrical resistivity should be further studied. However,electrical resistivity change rate of the carbon black concrete is small and relatively good stable.
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