Bonded concrete overlays of asphalt (BCOA), previously known as ultra-thin whitetopping, have become increasingly common in Illinois in the past 15 years. No methods exist for assessing in situ properties under loading for this type of overlay. A procedure to backcalculate layer properties from falling weight deflectometer tests does exist for concrete slabs on grade with infinite dimensions, but this method is not applicable to finite-sized BCOA slabs with multiple layers and interfaces. Based on two-dimensional finite element modeling of BCOA pavements, a backcalculation procedure was derived for a range of expected slab sizes, effective concrete pavement thicknesses, joint load transfer efficiencies, and foundation layer stiffnesses. The backcalculated effective concrete thickness quantifies the load-carrying capacity of the BCOA pavement, variation of the structural capacity as a function of distance along the roadway, and potentially the condition of the concrete–asphalt bond interface and the underlying asphalt concrete layer. Application of the BCOA backcalculation procedure to falling weight deflectometer data collected from several projects in Illinois confirmed the reasonableness of the procedure through observed performance and estimated layer thicknesses from construction.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Backcalculation Procedure for Bonded Concrete Overlays of Asphalt Pavement


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2014-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Improved Backcalculation Procedure for Continuously Reinforced Concrete Pavement

    Zhang, Yating / Roesler, Jeffery | Transportation Research Record | 2018


    Pavement smoothness of asphalt concrete overlays

    Yildirim, Yetkin | Online Contents | 2016


    Novel Method for Backcalculation of Asphalt Pavement Moduli

    Zhang, Xiaoning / Sun, Lijun | Transportation Research Record | 2004


    Backcalculation of Asphalt-Overlaid Concrete Pavements

    McPeak, T. J. / Khazanovich, L. / American Society of Civil Engineers; Airfield Pavement Committee | British Library Conference Proceedings | 1997