Recycling Law of Aged Asphalt Based on Diffusion Behavior of Rejuvenator/Virgin Asphalt

Abstract

Abstract: Tube method was used to simulate the diffusion of rejuvenator/virgin asphalt in aged asphalt. The formed rejuvenated asphalt in different layers were cut out for testing of conventional indexes, rheological properties and temperature susceptibility, so as to evaluate the variation laws of technical performance for rejuvenated asphalt with diffusion process of rejuvenator/virgin asphalt. In addition, the influencing mechanism of temperature and time on diffusion behavior of rejuvenator/virgin asphalt was also carried out. The results show that the performances of rejuvenated asphalt in different layers are restored to varying degrees and display gradient trend with the diffusion of rejuvenator/virgin asphalt. The farther away from the interface between virgin asphalt and aged asphalt, the closer the performance is to the aged asphalt. In the same diffusion position, RA-1 rejuvenator shows better diffusion ability and rejuvenating effect than virgin asphalt SK-90, especially in terms of improvement of cracking resistance at low temperature for rejuvenated asphalt. The increase of mixing temperature and extension of diffusion time within certain range are conducive to enhancing the diffusion ability of rejuvenator/virgin asphalt in aged asphalt and promoting the blending between virgin and aged asphalt.

Key words: hot recycling technology of asphalt pavement, hot reclaimed asphalt pavement, asphalt, aged asphalt, rejuvenator, diffusion behavior, rheological property, temperature sensitivity

CLC Number:

U414

XU Jinzhi, ZHANG Binjun, ZHANG Depeng. Recycling Law of Aged Asphalt Based on Diffusion Behavior of Rejuvenator/Virgin Asphalt[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4187-4196.

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