Impact Study of Basalt and Polyacrylonitrile Fibers on Performance Characteristics of Asphalt Concrete

The adhesion interaction at the bitumen-fiber interface was examined in test ranges for temperatures from 0 °C to 50 °C. Mechanisms of adhesion interaction are defined, as well as values of adhesion strength of compounds of asphaltic cement with basalt and polyacrylonitrile fibers, determining values of strength properties of fiber-containing road asphalt concrete mixtures. Qualitative effect of fiber surface relief on adhesion strength of bitumen-fiber joint is determined. The paper has been studied the effect of mixed fiber reinforcement of basalt and polyacrylonitrile fiber on physical and mechanical properties of asphalt concrete. Mixed introduction of basalt and polyacrylonitrile fibers reduces the speed of rutting on road asphalt concrete surfaces by 2.3 times higher as compared to physical and mechanical indices of asphalt concrete without addition of fiber. The average rate of rutting has a maximum value when the ratio of polyacrylonitrile fiber to 35% and basalt fiber to 65% in the combined sample is reduced by an average of 33 to 43%.