A mechanistic design procedure was developed for the state of Colorado to determine the required concrete thickness of thin [12.7 cm to 17.8 cm (5 in. to 7 in.)] whitetopping overlays on asphalt pavements. Field testing was conducted to evaluate critical load locations for whitetopping with joint spacing up to 3.66 m (12 ft). The load-induced flexural strains were used to calibrate fully bonded stresses computed by applying finite element analysis techniques to partially bonded stresses measured in the field. For each test section, load testing was conducted throughout the course of a day to develop a temperature correction for the critical stresses derived for zero temperature gradient (zero slab temperature curling). Equations predicting the critical concrete flexural stresses and asphalt concrete strains for use in whitetopping were developed. A mechanistic design procedure is described that allows the evaluation of trial whitetopping thicknesses and joint spacings. The procedure computes the concrete and asphalt fatigue life for specific material properties. Iterations are required to determine the appropriate parameters that provide the required design life for both concrete and asphalt layers. In addition to the design procedure, the effect of surface preparation during construction was studied by comparing identical slabs constructed on milled and unmilled asphalt. It was concluded that existing asphalt pavement should be milled and cleaned before concrete placement for an overall reduction of 25 percent in the critical load-induced stresses. However, new asphalt, such as that placed in repair patches, should not be milled before concrete placement to avoid a 50 percent increase in critical load-induced stresses.


    Zugriff

    Download

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Mechanistic Design of Thin Whitetopping Pavements in Colorado


    Weitere Titelangaben:

    Transportation Research Record: Journal of the Transportation Research Board


    Beteiligte:
    Tarr, Scott M. (Autor:in) / Sheehan, Matthew J. (Autor:in) / Ardani, Ahmad (Autor:in)


    Erscheinungsdatum :

    01.01.2000




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Performance Evaluation of Whitetopping and Ultrathin Whitetopping Pavements

    Li, Xiaojun / Wen, Haifang | Transportation Research Record | 2011


    Repair of Ultrathin Whitetopping Pavements

    Wu, Chung-Lung / Tayabji, Shiraz / Sherwood, James | Transportation Research Record | 2001


    Repair of Ultrathin Whitetopping Pavements

    Wu, Chung-Lung | Online Contents | 2001


    An Investigation on Load Transfer Behaviour for Whitetopping Pavements

    Baroowa, Dhritee Diksha / Maitra, Swati | Elsevier | 2025

    Freier Zugriff

    Guidelines For Concrete Overlays of Existing Asphalt Pavements (WhiteTopping)

    Voigt, G. F. / Mack, J. W. | British Library Conference Proceedings | 1996