Effect of High-Carbon Fly Ash on the Electrical Resistivity of Fly Ash Concrete Containing Carbon Fibers

Two series, each consisting of seven high-volume fly ash concrete mixtures with conductive carbon fibers, were used in this investigation. The first series of the concrete mixtures contained ASTM Class C fly ash and 0, 1, 3, 5, 7.5, 10, and 20 lbs. carbon fibers per cubic yard of concrete. The second series of concrete mixtures contained high-carbon fly ash in addition to the materials used in the first series. The high-carbon fly ash was used as a replacement of fine aggregate in the concrete mixtures. The electrical resistance of the concrete was measured at the ages of 1, 3, 7, 14, 28, 56, and 91 days. The study revealed a reduction in electrical resistance of concrete with an addition of high-carbon fly ash containing conductive carbon fibers. Finally, the study indicated that high-carbon fly ash could be used for making concrete of lower electrical resistance.