The addition of petroleum-derived oils (aromatic or paraffinic) and bioderived oils (typically low-viscosity, unsaturated hydrocarbons modified to remove acid functionality) to bitumen has become a burgeoning business to facilitate the use of increasing amounts of reclaimed asphalt pavement, reclaimed asphalt shingles (RAS), and combinations. These additives have been marketed as softening agents, to reduce high- and low-temperature performance grades, and as rejuvenators. Given the aging mechanism of bitumen and chemical changes that occur during aging, it is unlikely that any true form of rejuvenation is possible. In this paper data are provided on investigations into the use of a chemical class known as sterols, which can be obtained from seed oils and tall oil to retard the aging of bitumen. Investigations were carried out with RAS, with re-refined engine oil bottoms, and with the accelerated aging of bitumen and bituminous mixtures that contained sterol chemistry. The results demonstrated that, relative to controls without sterol, increases in the bitumen rheological index were reduced, and decreases in the colloidal index were reduced, as were decreases in the difference between bitumen low-temperature stiffness critical temperature and bitumen m-value critical temperature (ΔTc). Investigations with atomic force microscopy of bitumen samples with sterol additive, compared with those without, were used to understand the sterol additive function as the bitumen was aged.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Investigation of Sterol Chemistry to Retard the Aging of Asphalt Binders


    Additional title:

    Transportation Research Record: Journal of the Transportation Research Board


    Contributors:


    Publication date :

    2017-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Investigation into the Oxidative Aging of Asphalt Binders

    Liang, Yanlong / Wu, Rongzong / Harvey, John T. et al. | Transportation Research Record | 2019


    Oxidative Aging of Asphalt Binders in Hot-Mix Asphalt Mixtures

    Morian, Nathan / Hajj, Elie Y. / Glover, Charles J. et al. | Transportation Research Record | 2011




    Investigation and optimization of short-term aging test conditions for asphalt binders

    Li, Hui / Sun, Yang / Shan, Fei et al. | Elsevier | 2024

    Free access