ABSTRACT
After premature de-bonding failures of several roads in Germany, researchers at the Technische Universität Dresden developed a new test device, the Dresden Dynamic Shear Tester (DDST), for quality control and characterization of the interlayer bond. The DDST is a device that can be used to quantify the stiffness of the interlayer bond between asphalt layers at different temperatures, stress levels, and frequencies. This paper describes the testing methodology and results of this new equipment. The paper also explains the procedure to determine the interlayer bond stiffness by back-calculation of testing data. The results of experiments showed that the shear stiffness at the interlayer zone was strongly influenced by the temperature, frequency and normal load. The dependency on the normal load was more evident at high temperatures.
