Experimental Research on Strength of Graphite Conductive Concrete and Conductivity

In order to optimize carbon fiber-steel fiber-graphite conductive concrete composition ratio of the threeconductive material, through experiment, the effects of three graphite materials content and fineness on concrete compressive strength and electrical conductivity are studied in this paper, and through Grey analysis of the three materials, significant degree of influence on conductivity is derived. The results show that the greater the carbon fiber content, the better the performance of concrete conductivity, when the carbon fiber content greater than 0.8%, the resistivity tends to be stable, while the carbon fiber content of 0.4%, the maximum intensity, initially identified carbon fiber content is 0.4%; logarithmically content varies between resistivity and carbon fiber. The longer the curing period, the worse conductivity, and when the age of more than 21 d, the conductive properties are stabilized. The finer the graphite particles, the lower the concrete strength, and the better the electrical conductivity, in which the graphite fineness of 400 mesh and 600 mesh, the conductive properties are extremely close. As the graphite content increases, the compressive strength and electrical resistivity decreases, when the graphite content exceeds 8%, the conductivity is stabilized. Comprehensive determining carbon fiber, steel fiber and graphite content with 0.5%, 0.8% and 5%, the best performance concrete conductivity and high strength can be obtained, and a significant degree of three-conductive material on conductive property effects of concrete is: carbon fibergraphitesteel fiber.