Review on Applications of Lignin in Pavement Engineering: A Recent Survey

Lignin is the second-largest plant polymer on Earth after cellulose. About 98% of lignin produced in papermaking and pulping industry used for combustion heating or power generation. Less than 2% more valuable fields, mainly formulation dispersants, adhesives, surfactants. Asphalt one most important materials pavement engineering. It a dark brown complex mixture composed hydrocarbons with different molecular weights their non-metallic derivatives. Because chemical structure similar to that asphalt, it carbon-based hydrocarbon material. More researchers studied application In this paper, structure, application, extraction technology were summarized. This review article describing applications engineering exploring prospects application. There are three main types can be engineering, which asphalt mixture, roadbed soil. as modifier, extender, emulsifier, antioxidant, coupling agent. mixtures, an additive. road base soils, soil stabilizer. Furthermore, analyzed effects from life cycle assessment. The conclusions suggest lignin-modified exhibits viscosity hardness, its high-temperature resistance rutting significantly improved compared conventional asphalt. addition, some binders exhibit reduced low-temperature crack fatigue resistance, adjusted selected according climate change regions. performance additive extender has been proved feasible. also produce good mechanical properties well environmental benefits summary, plays role soil, likely development trend future due friendliness low cost. research needed generalize