Recycled Asphalt Binder (RAB) is the remaining asphalt from the aged pavement which contains a lot of agglomerated asphaltene. An effective rejuvenator requires to be capable of deagglomerating the asphaltene component while replenishing the light compounds. It is reported that phenolic compounds could effectively activate intercalant that helps to deagglomerate the aggregated asphaltene. Studies have shown that the phenolic hydroxyl functional group can be found in many biomasses. One promising pathway is from the waste black liquor, which contains up to 48% of the lignin and is difficult to degrade naturally, in the paper pulp mill. Several pathways such as acidification, membrane filtration, or electrolysis have been applied successfully to extract lignin from the black liquid. However, limited study has been conducted to investigate the effectiveness of using lignin additives to deagglomerate the aggregated asphaltene in the RAB. The aim of this study was to evaluate the effectiveness of black liquid lignin as an additive for the asphalt rejuvenating agent. Two types of commercial rejuvenators (CR) were also used as the control group. The lignin additive and two CR were mixed with RAB and virgin asphalt (VA) individually. Furthermore, the composites were subjected to a laboratory aging process that combines the Rolling Thin Film Oven (RTFO) and Ultraviolet light to simulate short-term and long-term aging, respectively. The rheological and chemical properties of those composites were measured. For the rheological properties, a Dynamic Shear Rheometer (DSR) was used to investigate the various rheological and performance indicators including dynamic shear modulus, phase angle, Glove-Rowe aging parameter, rutting resistance, and fatigue cracking resistance potential. In addition, Gel Permeation Chromatography (GPC) was employed to investigate the molecular size distribution of the various composites. In the two-materials composites, the L1 can reduce the large molecule up to 36%, while the rheological performance of lignin-modified asphalt composite is apparent between the VA and RAB. From the three-material asphalt composite scenarios, the RAB shows better resistance on rutting and fatigue cracking parameters. The normalization of GPC results also shows that the area of the three-materials combination could decrease from 63% to 73% compared to the RAB. The lignin additive has shown the potential to deagglomerate the RAB and able to partially recover the rheological properties.

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