Splitting stress-strain properties of cement stabilized reclaimed asphalt pavement

To evaluate splitting tensile stress-strain properties of cement stabilized reclaimed asphalt pavement (RAP), four types of mixture containing varying percentages of RAP (0, 15% and 30%) and cement (4.5% and 5.0%) were designed in this paper. A mix made from only virgin material and cement dosage of 4.5% was selected as the control mix for the investigation. Five indexes, splitting tensile strength, splitting resilient modulus, peak strain, energy density and brittleness index, were used to assess the influence of RAP content and test temperature (-15, 5, 20°C and 35°C) on splitting properties via splitting tensile test. The test results have indicated that splitting tensile strength, splitting resilient modulus and brittleness index decrease with the increasing of temperature, and the decreasing amplitude increases with the increasing of RAP content. The splitting tensile strength and peak strain decrease persistently with the increasing of RAP content, while the brittleness index augments at -15°C. In positive temperature cases, splitting strength, peak strain and energy density increase first and then diminish with the increasing of RAP content, whereas, modulus and brittleness index tend to decrease. A positive linear correlation between splitting strength and other indexes exists, and the optimal RAP content is from 15% to 20%.