Abstract: In China, about one hundred million of reclaimed asphalt pavement (RAP) are produced every year. Worldwide, the length of asphalt pavements and amount of recycled asphalt pavement also grow continuously. Additives have been used to improve the performance of asphalt pavements with high RAP content, such as rejuvenation agent and antiaging agent. Compared with the rejuvenators, antiaging modifiers receive little attention in current asphalt recycling industry because the conventional antiaging agents provide limited anti physical hardening performance and are usually cost-intensive. Therefore, there is a great need to develop effective and long-lasting antiaging additives for recovered asphalt binders. This study aims to develop new complex asphalt antiaging agents that contain both antioxidants and microcapsules in order to prevent the physical hardening of asphalt binder by both obstructing the chemical oxidation reaction and sustainably releasing the rejuvenation oil. The antioxidants involve the commercial antioxidant Irganox and sodium lignosulfonate. The microcapsules are prepared by polystyrene-shell and two type of oil-core materials: cooking vegetable oil and commercial rejuvenation oil using phase separation method. SEM shows that the microcapsules are successfully synthesized. The base asphalt binder and modified asphalt binders are treated by a pressure aging vessel (PAV) to simulate the long-term aging of asphalt binder, then measured by the dynamic shear rheometer (DSR). Results show that the four antiaging additives developed can effectively slow down the physical hardening of asphalt binders. Overall, the additive with microcapsules containing rejuvenation oil and sodium lignosulfonate demonstrates a superior antiaging performance, which reduces 22.4% of the asphalt hardening rate and 27% loss rate of asphalt ductility. The second ranked antiaging additive includes the microcapsules with commercial rejuvenation oil core and Irganox antioxidant, which results in a 21.3% reduction of physical hardening and 19.5% reduction of losing durability. By comparison, the aging additives containing cooking vegetable oil microcapsules present a lower performance in reduction the viscosity of asphalt binder and conversely increase the loss rate of asphalt ductility. On the other hand, the two antiaging additives containing rejuvenation oil microcapsule provide a better fatigue resistance but a lower rutting stabi-lity, which is opposite to the antiaging additives containing cooking oil. By analyzing the change of functional groups during oxidation process, results indicate that the control of carbonyl and sulfoxide products is the key to the physical anti-aging of asphalt binder, and the prevention of physical aging is more relied on controlling the production of sulfoxides. The design of antiaging agents in this study is proved to provide sustainable softening and rejuvenation effects to recycled asphalt binder, and has high potential to be developed into mature technologies that benefit the road and highway construction industry as well as environmental conservation.
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2019, Vol. 33 
