The current study aims to evaluate the performance of geosynthetic-interlayered asphalt layers under cyclic loading conditions. In this regard, a control and geosynthetic-interlayered asphalt beam specimens were tested under a cyclic four-point bending test apparatus replicating an equivalent single axle contact pressure of 550kPa. Two different types of geosynthetic-interlayers viz., glass-grid composite (GGC) and bi-axial polyester grid (PET) were adopted. The cyclic four-point bending test results suggest that the geosynthetic-interlayers enhanced the performance life of asphalt layers by about 46-fold and 38-fold, respectively for GGC and PET interlayered specimens with respect to the control specimens. Geosynthetic-interlayers found to initiate delamination of the asphalt layers at the interface. To understand the delamination of the asphalt layers, the interface bond strength properties of control and geosynthetic-interlayered asphalt specimens were evaluated. Results revealed that there is a reduction in the interface bond strengths of about 36% and 16% in the GGC and PET interlayered specimens. Overall, it was found that along with the tensile properties bonding characteristics also important in enhancing the performance life of geosynthetic -interlayered asphalt layers. Copyright © Soil Mechanics and Geotechnical Engineering, ARC 2019.All rights reserved.