Application of tack coat in pavement engineering: Fid-Bau Portal

Application of tack coat in pavement engineering

Wang, Jiayu / Xiao, Feipeng / Chen, Zheng / Li, Xinghai / Amirkhanian, Serji

Highlights•Emulsified asphalt was the most common asphalt among all types of tack coats.•Tack coat should be applied to a clean, dry and well-compacted under layer.•The use of trackless emulsions was a solution to tack coat removed from the surface by construction equipment.•The shear tests were the most commonly used approaches to verify the interlayer bonding strengths.•The intrinsic factors and application conditions together influenced the properties of interlayer bonding.

AbstractThe interlayer bonding between pavement layers has significant effects on the pavement performance responses during the traffic loading. The insufficient bond adhesion may increase the transferred stresses and extended strains in the relevant layers when applied to traffic. Over the last 30years, many research studies focused on these related fields and found some useful conclusions to help conduct field practices of tack coat materials. In this review, it was found that the shear mode tests were the most common methods to verify bond strength and some non-destructive tests were becoming more and more useful to investigate tack coat properties. In addition, some test parameters including shear strength, cracking resistance and fatigue performance were used to assess tack coat properties. The intrinsic factors such as tack coat type, application rate, curing time and the application conditions including temperature, moisture, and surface texture together influenced the characteristics of interlayer bonding. However, pavement failure mechanisms and the interactions between influence factors are needed to be investigated in the future.