Influence of rejuvenator preheating temperature and recycled mixture's curing time on performance of hot recycled mixtures. (9th August 2021)

• Record Type: Journal Article
• Authors: Li, Mingchen; Liu, Liping; Xing, Chengwei; Liu, Lingxiao; Wang, Huayu
• Is Part Of: Construction & building materials. Volume 295(2021)
• Publication Date: 2021-08-09
• Subjects: Hot recycled asphalt mixture -- Molecular dynamics -- Diffusion -- Preheating temperature -- Curing time -- Mixing method; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2021.123616
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Increasing the preheating temperature and diffusion time of rejuvenator can enhance its diffusion. The 110℃ rejuvenator preheating temperature is recommended to improve diffusion effect. The 3-hour recycled mixture's curing time is recommended to improve its performance. Abstract: The recycled hot mix asphalt mixture performance is improved by a rejuvenator with good diffusion ability. This paper investigates the rejuvenator-aged asphalt diffusion and its influencing factors, including the rejuvenator's preheating temperature and curing process of recycled mixtures. A molecular dynamic simulation of the diffusion process between rejuvenator and aged asphalt is performed. Its results are then validated by a gel permeation chromatography test. Laboratory tests are also employed to evaluate these two factors' influence on the recycled mixture's performance on a macroscale. Simulated and experimental results strongly indicate that a proper combination of rejuvenator preheating and recycled mixture curing improves the rejuvenator diffusion ability and the recycled mixture performance. Following this, the 110℃ preheating temperature of rejuvenator and the 3-hour curing time after completing the mixing process of the hot plant-mix asphalt mixture are recommended based on the above results.