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Since Lignin fibers are insoluble in water and organic solvents, they possess excellent flexibility and dispersibility. Adding an appropriate amount of lignin fiber to asphalt mixtures can enhance resistance to shrinkage cracking, improve the thixotropy and anti-flow properties of the asphalt mixture, extend open time, and achieve thickening effects. Lignin fiber is one of the important additives in stone mastic asphalt (SMA) and has been widely applied domestically since the 1990s.

The most notable feature of lignin fiber is its inherent flexibility and unique three-dimensional network structure. These characteristics enable lignin fiber to enhance crack resistance, thickening, and oil retention within the system, as well as to absorb 5-6 times its own weight. This structure and these traits improve the workability, operational performance, anti-slip performance, stability, and thermal stability of the material, thereby increasing the strength of the mixture along with the bonding strength and uniformity of material strength relative to the aggregate. All of these properties make lignin fiber an indispensable additive in the mixture.