ABSTRACT
ABSTRACT: This paper presents the Advanced Shear Tester (AST) device capable of testing of 150 mm in diameter cylindrical samples in the shear mode. Samples can be either typical bi-layer pavement cores or solid gyratory compacted specimens. Validation of the AST design was performed on the Hot-Mix Asphalt (HMA) specimens prepared in laboratory conditions as well as cored from the asphalt pavement. For the comparison, the abbreviated triaxial test was conducted in order to determine the Mohr-Coulomb failure criterion of the HMA samples. The results demonstrated that monotonic strength tests in the AST device can be used to determine the Mohr-Coulomb failure envelope for solid HMA samples. Additionally, the AST can differentiate between different application rates of the interlayer bonding agent during the shear strength and shear fatigue tests. It was observed that the dissipated energy parameter from the fatigue testing is the most indicative of the application rate of the interlayer material.
