Effect of Different Fibers on Pavement Performance of Asphalt Mixture Containing Steel Slag

The objective of this paper is to investigate the effect and mechanism of three types of fibers-basalt fiber (BF), polyester fiber (PF), and lignin fiber (LF)-on the pavement performances of asphalt mixtures containing basic oxygen steel making furnace slag (BOF). The dynamic modulus test, low-temperature bend test, and three-point fatigue bending test were conducted, and the antislide performance and attenuation law were analyzed. The reinforcement mechanisms of the three types of fiber in the steel slag asphalt mixture were studied. The results reveal that there are differences in pavement performance after the addition of fibers; fibers could result in increasing the dynamic modulus of steel slag mixtures, especially at lower frequency area; fiber can improve low-temperature crack resistance of steel slag asphalt mixtures; the antislide performance is enhanced after the addition of fibers; fibers can also improve the resistance to repeated bending tensile load to enhance the antifatigue performance of steel slag asphalt mixtures; moreover, BF offers the optimal pavement performance. This research can provide a useful reference for practical applications of BF, PF, and LF in road engineering.