## 1 Introduction  
Asphalt mastic is a micro-dispersion system found in asphalt mixtures, where the filler acts as the dispersed phase in a high-consistency asphalt medium. The composition and microstructure of the mastic as well as its rheological characteristics, have a significant impact on the asphalt mixes' high-temperature stability and low-temperature deformation resistance. Recently, fibers have become a common additive or modifier to enhance the adhesion characteristics of asphalt mastic, increase the shear resistance of the mixture, and extend the pavement's service life [1, 2]. The fibers disperse uniformly throughout the asphalt mixture and form a network structure that produces reinforcing and bridging effects, significantly enhancing the stability of both asphalt and asphalt mixtures. Fibers are widely used to improve the performance of asphalt pavements, but the research on fiber-modified asphalt mastic is limited and focused on a single type of fiber. Different fibers exhibit different modification effects on asphalt mixtures in various performance areas. For instance, the stiffness and rutting resistance of asphalt mixtures can be improved by the inclusion of polyester fiber and basalt fiber. On the other hand, it has been discovered that bamboo fiber increases the fatigue life of asphalt mixtures. Straw fiber works better at low temperatures despite being less effective at high temperatures. The addition of fibers to asphalt mixtures can improve the resistance to crack extension and raise the damage temperature. It should be emphasized, though, that the addition of fibers has a limit on how much low-temperature strength in asphalt mixtures may be improved. Asphalt mixtures' moisture sensitivity can be increased byamid fibers, while their mechanical qualities can be enhanced by ceramic fibers [3; 4; 5]. The low-temperature performance of asphalt mixtures can be enhanced by mixing polyester fiber with an anhydrous calcium sulfate whisker. Combining various fibers and rubber powder has the potential to increase the asphalt mixtures' resistance to freeze-thaw damage and moisture stability. The impact of freeze-thaw cycles on fiber-modified asphalt mixtures; however, continues to be a problem that requires attention. Overall, using natural fibers has the benefit of being environmentally benign and renewable, which promotes sustainable development. Future technical applications and research in the realm of fibers in asphalt mixtures look promising. The types of fibers currently used in roadways are diverse, and the modification effect of different fiber types on asphalt mixtures is shown in different performance areas. [PERSON] et al. found that adding polyester and straw fibers improved the performance of asphalt because they were compatible with asphalt and that straw fibers were not as effective as polyester fibers in modifying asphalt at high temperatures, while straw fibers were more effective at low temperatures [6]. [PERSON] et al. used three different fibers (i.e., carbon fibers, steel fibers, and steel wool) as microwave-absorbing materials to create self-healing asphalt mixtures that improved the mechanical properties and healing ability of the mixtures [7]. [PERSON] et al. used ceramic fibers to develop ceramic fiber modified asphalt mixtures, showing that there is variability in the degree of influence of different fiber types on the mechanical properties of asphalt mixtures, and good wettability and dispersion of fibers and asphalt in the mixtures were found by scanning electron microscopy (SEM) experiments [8]. [PERSON] et al. prepared a polyester fiber composite reinforced asphalt mixture (ACPRA) to meet the low temperature performance requirements by optimizing the anhydrous calcium sulfate whisker (ACSW) and polyester fiber content, where the asphalt aggregate ratio was 4.0%, the ACSW content was 10.8%, and the polyester fiber content was 0.4% [9]. The addition of basalt fibers to asphalt mixtures can strengthen the mixture and effectively improve its high and low-temperature performance.