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Chip seal performance measures : best practices.
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  • Abstract:
    The Washington State Department of Transportation (WSDOT) has a long history of designing, constructing,

    and maintaining chip seal or bituminous surface treatment pavements. However, to date WSDOT has not

    developed pavement performance indicators or models to predict chip seal service life, but rather assumes an

    average life of 6 to 8 years. Due to funding constraints and good pavement management practices, WSDOT

    has increased the number of pavement segments that are candidates for receiving chip seal applications. In

    order to improve predictions of chip seal performance and improve their demonstrated cost effectiveness,

    chip seal performance indicators are needed.

    The objectives of this research project are to evaluate different performance indicators for chip seal

    treatments and to develop trigger values for these indicators that will indicate the end of service life and the

    appropriate index values for resurfacing. Under Phase I of this study, a formal literature review and detailed

    survey of transportation agency practices were conducted to identify which pavement distress or combination

    of distresses best characterize the optimal timing for chip seal application. This report summarizes the

    findings of the literature review, agency survey, WSDOT pavement management and performance modeling

    practices, and a recommendation of potential performance models for further evaluation as additional data

    become available.

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