A Comprehensive Review of Sub Base Layer Permeability and its Influence on Pavement Performance

Abstract India has one of the world's longest road networks, spanning over 6.61 million kilometres of road length. Most of the roads constructed are having poor drainage characteristics, causing premature failure which leads to high maintenance cost before reaching their design life. Drainage has been extensively used in pavement structures to intercept water from entering pavement through various sources. An effective pavement drainage design depends on comprehensive understanding of drainage methods and their effectiveness. The performance of the pavement drainage layer depends on the stability and the drainage effective of the material used in the construction. The purpose of this study is to review the various studies that researchers have conducted on efficient road and highway drainage systems. Selection of material, drainage effectiveness and the influencing factors were analysed, which provides a reference for sustainable drainage design.