An Eco Friendly Substitute of Asphalt Binder – Review

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.

Effect of thermal variances on flexible pavements

“…In the 1990s, Canadian and American researchers focused on utilizing a novel technique for analyzing data on asphalt paves. As a result, a valuable database is currently accessible to assist research on pavement temperatures based on many data and information on pavement temperatures and climatic factors, such as air temperature and solar radiation [23].…”

“…In that second step, however, most researchers used the reversal technique to build models to forecast the temperature of asphalt by focusing on the lowest and highest asphalt pavement temperatures throughout the service period using the Superpave method. Consequently, many studies have also begun to examine daily pavement temperature forecasts with somewhat varied changes and have been effectively applied in road engineering.The researchers employed statistical methods during a third phase, from 2000 to the present, to develop a regression prediction model in two applications, namely to correct deflection measurements in pavement layers with a back-calculation method and to simulate temperature fluctuation distributions in the structure of the asphalt [23][24][25]. The third phase of the study is heavily affected by the research results in the preceding phase, despite the significant expansion of the area of inquiry.…”

Effect of Thermal Variances on Flexible Pavements

“…In the 1990s, Canadian and American researchers focused on utilizing a novel technique for analyzing data on asphalt paves. As a result, a valuable database is currently accessible to assist research on pavement temperatures based on many data and information on pavement temperatures and climatic factors, such as air temperature and solar radiation [23].…”

“…In that second step, however, most researchers used the reversal technique to build models to forecast the temperature of asphalt by focusing on the lowest and highest asphalt pavement temperatures throughout the service period using the Superpave method. Consequently, many studies have also begun to examine daily pavement temperature forecasts with somewhat varied changes and have been effectively applied in road engineering.The researchers employed statistical methods during a third phase, from 2000 to the present, to develop a regression prediction model in two applications, namely to correct deflection measurements in pavement layers with a back-calculation method and to simulate temperature fluctuation distributions in the structure of the asphalt [23][24][25]. The third phase of the study is heavily affected by the research results in the preceding phase, despite the significant expansion of the area of inquiry.…”