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Determination of the appropriate use of pavement surface history in the KDOT life-cycle analysis process.
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    Final report
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  • Abstract:
    The primary objective of this study was to evaluate KDOT’s pavement surfacing history and recommend

    whether or not the department’s life-cycle cost analysis (LCCA) procedure should include a surfacing history

    component, and, if so, how the LCCA process should be revised/ updated to incorporate surfacing history.

    An analysis using KDOT’s databases demonstrated that they could be used to estimate performance of

    new or reconstructed pavement lives for use in the LCCA process. For the predominant pavement types used

    in Kansas, full-depth asphalt concrete (FDAC) and doweled, jointed plain concrete (JPC-D), service lives were

    estimated to be 12 years and 20 years, respectively. These compare with 10 years and 20 years currently being


    The impact of modifying the service lives for FDAC and JPC-D pavements was evaluated using the LCCA’s

    of 12 recent KDOT construction/reconstruction projects. The LCCA’s were obtained and re-computed using lifecycle

    models formulated from results of the performance analyses conducted for FDAC and JPC-D pavements

    and for maintenance and rehabilitation (M&R) treatments applied to them. The resulting life-cycle costs were

    then compared with those computed by KDOT. It was found that modified performance lives resulted in only a

    negligible change in the overall NPV for both pavement types on the 12 projects evaluated.

    Three alternative methods for computing future rehabilitation costs for use in LCCA were presented and

    evaluated. One method, which utilizes a cost-to-own approach, warrants further evaluation and development. The

    advantage of the cost-to-own approach is that it does not require modeling of the service lives of the pavement

    being studied. It appears the cost data to perform this type of analysis are available in the KDOT data base.

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