01661917

Component

Asphalt binder in hot-mix asphalt (HMA) pavement is subject to oxidative aging. Upon aging, the chemical changes of asphalt binder transfer to its physical changes, and the physical changes transfer to the behavioral and performance changes of HMA mixture. Therefore, understanding binder aging variations in asphalt pavement structures is critically important for mechanistic-based pavement design and analysis. Using test data on extracted asphalt binders from 21 roads in different climate conditions, this study examined the relationship between asphalt binder aging state and pavement depth. The study found that binder aging severity does not necessarily continuously decrease with pavement depth. Data from different climate conditions even show opposite trends. Therefore, one uniform empirical equation is inadequate to characterize the aging-depth relationship for all the asphalt pavements. It is recommended that a mechanistic-based binder aging model be developed in the future that takes the following fundamental influencing factors into consideration: aging susceptibility of the asphalt binder, temperature, and binder oxygen exposure.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders. Alternate title: The Aging–Depth Relationship of Asphalt Binders in Hot-Mix Asphalt Pavements.

18-05687

English

19p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Aging (Materials); Asphalt pavements; Bituminous binders; Climate; Hot mix asphalt; Mechanistic-empirical pavement design; Oxidation; Temperature

Pavement thickness

Design; Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-05687

TRIS, TRB, ATRI

Jan 8 2018 11:27AM