01697322

Component

Laboratory and field oxidation of asphalt binders are heterogeneous reactions in which oxygen interacts with the binder molecules. To apply an adequate model to study the formation of functional groups such as carbonyl and sulfoxide with time, a kinetic equation must be selected according to the conditions of the reaction, such as temperature and heterogeneity. Consequently, the Ozawa kinetic model for heterogeneous and isothermal reactions was applied in this paper to samples of binders subjected to two different oxidative conditions: environmental and accelerated in laboratory the (PAV). It was found that field oxidation and laboratory oxidation follow the same mechanism, ruled by the diffusion of oxygen molecules into the binder surface. The activation energy for carbonyl and sulfoxide production was found to be different for the aging procedures. The findings serve as starting point to calibrate an aging procedure that better simulates oxidation, as well as to select binders in terms of their oxidation proneness.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.

19-03684

English

7p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; References; Tables

Bituminous binders; Field tests; Laboratory tests; Oxidation

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2019 Paper #19-03684

TRIS, TRB, ATRI

Dec 7 2018 9:24AM