ABSTRACT

A tack coat is a thin layer that ensures the bonding between an asphalt overlay and existing pavement. Adequate tack coat bonding is required for the composite pavement structure to behave as a single layer. The bond strength is significantly reduced at high temperatures, given that the tack coat is a temperature-dependent material. This implies that debonding frequently occurs at high temperatures, such as those in the summer season. However, the distresses or failures related to debonding may not occur due to the recovery of the bond strength by the healing effect of the tack coat material in the early-age of the composite pavement. The aim of this study was to verify the healing effect of the tack coat at the interface between the asphalt overlay and existing concrete layer based on pull-off tests.