Abstract:The influence of tack coat type and content, paving technology and service environment on the adherence of asphalt overlay with geotextile interlayer were investigated in terms of shear damage energy based on layer parallel direct shear test. The correlation between adherence and anti reflective cracking performance of geotextile interlayer was also verified through three point fatigue bending beam test. The results show that the optimum content for emulsified asphalt, base asphalt, SBS modified asphalt is 12, 09, 08kg/m2 respectively. The adherence of geotextile interlayer with the SBS modified asphalt which can reach the adherence level of common asphalt overlay is superior to those offered by the emulsified asphalt or base asphalt. Lower shear resistance is obtained for lower asphalt mixture paving temperature when SBS modified asphalt is sprayed one time. However, there is no difference in the adherence for different asphalt mixture paving temperatures when SBS modified asphalt is sprayed twice. The adherence of geotextile interlayer becomes poor when the test temperature rises or the immersion time increases. The influence of test temperature on adherence affects the geotextile interlayer less than the reference, while the reverse is true for the influence of water. There is a strong positive correlation between adherence and anti reflective cracking performance for geotextile interlayer.