Studying the Effect of Different Tack Coat Materials on Interface Bond Strength of Flexible Pavement Overlay

Abstract

Asphalt pavement is a complex structure usually consists of surface, the base and subbase courses on a subgrade. A complete bond between layers will made the pavement work as a single composite structure. A slippage is the one most common distress due to poor bonding among pavement layers which decrease the life of overlay pavement structure. This research is a try to estimate bond strength at the interface among pavement layers by performing laboratory tests. FDOT test method use to evaluate the bond between bituminous layers, to carry these objective cylinder specimens with 101.6 mm diameter need set using normal Marshall Process firstly for the fundamental layer, follow in application of tack coat and lastly overlay with the upper layer in the similar mold in a fitting manner. After the samples tested it is detected interface bond strength depend on tack coat type and rate .The optimal quantity of tack coat has been establish 0.25l/   for Css-1 and Anionic, 0.4 l/   for Rc-70.