Diffusion and Regeneration Mechanism of Waste Composite Oils Rejuvenator in Aged Asphalt

Abstract

The physical performance of recycled asphalt was used as the main evaluation index to study the optimal range of a self-made rejuvenator. Through the penetration, viscosity and gel permeation chromatography (GPC) tests, the diffusion degree of the rejuvenator under different temperatures and time process was analyzed, and the diffusion efficiency of the rejuvenator was evaluated from the macro and micro perspective. The regeneration mechanism of the rejuvenator in the aged asphalt was also analyzed using the Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and chemical composition tests. The research results showed that the optimum rejuvenator content was about 3%. Higher temperature and longer time were beneficial to improving the permeability and diffusion of the rejuvenator. During the aging process, the light components were reduced, and more macromolecular asphaltenes were generated as well as a large number of carbonyl and sulfoxide. After diffusion and regeneration, the light components in the asphalt were supplemented, the wrinkles and gullies of the aged asphalt were almost improved to the surface state of the matrix asphalt.

Keywords

recycled asphalt / waste engine oil / waste cooking oil / rejuvenator / regenerant diffusion / regeneration mechanism

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