Asphalt mixture layers' interface bonding properties under monotonic and cyclic loading

This paper focuses on investigating the interface shear bonding properties of asphalt pavement structures using both monotonic and cyclic direct shear tests. Several pavement structures were considered, differing in the asphalt mixture type and tack coat type, and laboratory preparation of the double-layered asphalt specimens. Based on the results on bond materials used in this research, it was found that the resulting shear strength from monotonic shear test can be used only as a rough indicator for long term interface bonding performance, because not all research and field experience could be reflected in the test results. The cyclic shear test employed in this study can be used for evaluating the interface fatigue performance. Additionally, differentiation between particular bond materials with respect to interface shear bonding properties is assured.