01626244

Component

This paper evaluates the effects of bio-based additives on the rejuvenation of aged binder. In the first section, a molecular dynamics simulation was used to study the effect of bio-binder, a newly introduced amide-rich compound, on the structural changes of an asphaltene dimer within the range of PG 64-22 binder grading at -22, -12, 0, 25 and 64°C. The binding energy of the final system, diffusion of the amide molecule into the asphaltene dimers, and changes in the stacking distance of asphaltenes were measured. The results show that the amide group interacts with asphaltene dimer, increasing the stacking distance of asphaltenes, with the highest influence observed at 64°C. In addition, as the temperature increases, diffusion of bio-binder into the asphaltene sheets increases whereas at lower temperatures, the diffusion was shown to be almost zero. In the second section, a series of tests at high, intermediate, and low temperatures was used to study the rheological properties of aged binder in the presence of a rejuvenator. Three rejuvenators were used for the experiments: Anova, RA5, and Bio-binder. Overall, Anova was shown to improve the properties of the aged binder closest to those of unaged binder. Bio-binder and RA5 performed similarly in terms of restoring aged asphalt properties. Crossover temperature was used as an indicator to evaluate extent of restoration of aged asphalt properties.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders. Alternate title: Investigation of the Efficacy of Asphalt Rejuvenation Using Bio-Based Additives.

01618707

17-06415

English

15p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; References; Tables

Asphaltene; Bituminous binders; Rheological properties; Temperature

Bio-binders; Molecular dynamics (Computer simulation); Rejuvenation; Rejuventors

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2017 Paper #17-06415

TRIS, TRB, ATRI

Dec 8 2016 12:36PM