Abstract
The review focuses on the potential use of wood lignin as a partial substitute and performance enhancer in asphalt binders. The aim behind this reviews to fight issues like durability, strength and the reduction in aquifer recharging. Lignin is a dead natural polymer occurring in the secondary cell wall of plant cells. During polymerisation, monlignols accumulate in a non uniform manner, thus leaving behind pores in the structure. Using this property in our asphalt binders would render roads as permeable to water. But lignin being hydrophobic in nature, the material would not corrode due to water actions, unlike commonly used bitumen. Various tests have been conducted to generate aging conditions on test using lignin as asphalt binder. All of them show that lignin addition to binder brings stiffness. Lignin also positively effects high temperature rutting performance, without adversely affecting low temperature. Lignin additionally also shows better recovery than bitumen as binder. The fatigue resistance of surface is negatively affected by lignin. Basically the result of various studies suggests that wood lignin is a promising substitution of bitumen as binder, coming with economic savings and environmental benefits.
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