Field cores were taken in 1995 and 2002 from eight asphalt pavements constructed in 1993 at FHWA's pavement testing facility to evaluate in situ pavement aging. Dynamic mechanical properties of these cores were evaluated by using the Superpave® shear tester. The moduli of aged pavements were also predicted from binder, aggregate, and mixture properties with available prediction models, and the aging severity levels of all pavements were compared between the lab-measured and model-predicted. Eight pavements with two polymer-modified and six unmodified binders were evaluated in this study. Polymer-modified asphalt pavements showed comparatively lower aging than unmodified asphalt pavements. For unmodified asphalt pavements, stiffer asphalts tended to have higher aging indices. The binder aging index was found to be inversely proportional to the loading frequency, and differences between the aging indices for different binders were higher at lower frequency. Comparison of lab-measured and model-predicted binder aging indices showed similar rankings for all binders. Low stiffness binders, for example, AC-5, showed higher aging indices than high stiffness binders, for example, Styrelf. Pavement depth significantly affected binder aging. The aging index near the surface (6.35 mm) was found to be about four to five times the aging index at a depth of 139.7 mm in pavement. Comparison of lab-measured and model-predicted mixture aging indices showed large variations, from overpredicted to quite underpredicted, depending on the binder type and nominal maximum aggregate size.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Assessment of Aging at FHWA's Pavement Testing Facility


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2005-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Assessment of Aging at FHWA's Pavement Testing Facility

    Al-Khateeb, Ghazi / Qi, Xicheng / Shenoy, Aroon et al. | Transportation Research Record | 2005



    Mechanistic Analyses of FHWA's Accelerated Loading Facility Pavements

    Al-Khateeb, Ghazi / Gibson, Nelson / Qi, Xicheng | Transportation Research Record | 2007


    FHWA's Quality Journey

    Jones, Fred | Online Contents | 1996