Study On The Force And Electrical Conductivity Of Graphite Tailings Concrete

Years of mining graphite in China left numerous of tailings which ivines the lands and pollutes the environment, in addition, it haven’t been effective development and utilization. In this paper graphite tailings will be added to the concrete, then concrete strength and electrical conductivity was analyzed. Orthogonal design method was used to study how water-cement ratio, sand ratio, tailings content, chopped carbon fiber content and other factors affects the quality of concrete such as compressive strength, conductivity, pressure-sensitive and frost resistance as well as whether tailings could be applied to buildings, roads and bridges construction. The results show that graphite tailings concrete has higher compressive strength while water-cement ratio and tailings content increase and chopped carbon fibers slightly increase. Resistivity of graphite tailings concrete with tailings content decrease with the carbon fiber content increase, and vice versa. In the elastic range, the resistivity of graphite tailings concrete decreases with increasing stress, and vice versa, its pressure-sensitive characteristics showed better correspondence. Graphite tailings have little effects on compressive strength and mass after freeze-thaw as a result of carbon fiber could reduce the loss of mass and compressive strength of concrete after freezing and thawing. It was found after analysis that the optimal mixing amount of tailings is about 10% while carbon fiber is about 0.3%. This thesis is helpful to get a deep recognition about mechanical and electrical of graphite tailing concrete, has certain theoretical significance and value of practical application to development of improving engineering project.