The bonding of asphalt layers has direct reliance on road pavement structures strength and durability. Because of insufficient bond of pavement layers the slippage and tearing, rutting and cracking emerge and the pavement life cycle becomes shorter. The article describes the research, which was made in 2010-2011 at Vilnius Gediminas Technical University Road Research Institute. In this research the strength of layers bonding was assessed using direct shear (Leutner) test, without normal stress in specimen. The samples were chosen from road sectors in Lithuania with standard asphalt layers, also asphalt layers with geosynthetics interlayer.

asphalt layers bonding, bonding strength, Leutner test, asphalt pavement