抄録
Recycled asphalt mixture is a multiphase system, which consists of sized recycled asphalt pavement (RAP), new asphalt, and/or recycling agents and new aggregates. RAP percentages may have influences on performance of total recycled asphalt mixture. The performance of an asphalt pavement is significantly affected by its resistance to permanent deformation (rutting) and its fatigue performance (crack formation and propagation). The indirect tensile test (ITT) represents an appropriate procedure for the study of crack formation (crack development) in asphalt pavements. The paper presents the results of a project aimed at investigating static and dynamic response as cracking and fatigue behaviors of recycled asphalt mixtures using the ITT. In particular ITT were performed in which the RAP percentages, loading mode and test temperature was varied. The analysis of the test results summarized below. (1) The indirect tensile strength and failure stiffness modulus show significant increase with RAP percentages in static loading test using ITT, especially in high loading speed. (2) Recycled asphalt mixture with recycling agent shows high fracture energy, which can prevent crack propagation. (3) The number of load cycles to fatigue failure expected presents a bit decrease with RAP percentages in dynamic loading test using ITT. (4) Recycling agent shows significant decrease in tensile strength and increase in fatigue life. It can be concluded that the ITT provides information of the influences of RAP and recycling agent to the recycled asphalt mixture.
