Rheological properties and viscoplastic model of asphalt in miscible recycling asphalt mixture

Abstract

Abstract: The rheological properties of blended original and aged asphalt with the recycled agent miscible affect the performance of large-mix recycled asphalt mixtures directly. Fourier infrared spectroscopy (FTIR), dynamic shear rheometry (DSR), and multi-stress creep recovery test (MSCR) were used to study the changes of characteristic functional groups, complex modulus, and irrecoverable creep flexibility after miscibility of different proportions of original asphalt, aging asphalt and regenerant. The mechanical response of asphalt is predicted based on the results of the multi-stress creep recovery test and viscoplastic strain model (VP model). A comparative analysis of the road performance of large-dose hot recycled asphalt mixtures was conducted. The results show that the carbonyl index is poorly correlated with the conventional asphalt indices. The regeneration effect of miscible hot recycled asphalt can be effectively controlled by using a range of folded sulfoxide group and aromatic characteristic functional group area index. The VP visco-plastic strain model accurately captures the strain response of rejuvenated asphalt under repeatedcreep-recovery loading. It is recommended that, during mixture design, original and aged asphalt be blended first, followed by the determination of the optimal rejuvenator dosage to ensure desirable rheological properties of the rejuvenated binder.

Key words: miscible hot recycled asphalt, creep recovery, rheological properties, viscoplastic model

CLC Number:

U414

WANG Meng, LI Ping, LIU Bin, DING Pang, ZHAI Xiao-cheng. Rheological properties and viscoplastic model of asphalt in miscible recycling asphalt mixture[J]. Journal of Lanzhou University of Technology, 2025, 51(6): 125-132.

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