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Develop draft chip seal cover aggregate specification based on AIMS angularity, shape and texture test results.
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  • Abstract:
    The objective of the study is to improve Oklahoma Department of Transportation (ODOT) chip

    seal design and performance through introducing new criteria for the selection of cover

    aggregate and binder. These criteria will be based upon the recent technological advances in

    the characterization of aggregate shape and texture as well as aggregate-binder compatibility.

    The study evaluates the shape and texture-related index properties, as well as durability, of

    commonly used cover aggregates in chip seal programs in Oklahoma. Additionally, it will

    provide a methodology for inclusion of these characteristics as a metric in future chip seal

    specifications. The study includes both laboratory testing and construction and performance

    evaluation of chip seal test sections. The study is ongoing and is quantifying how well the

    newly developed performance-based uniformity coefficient (PUC) correlate with chip seal

    performance in Oklahoma, and if it should be incorporated into state chip seal specifications. It

    has generated aggregate-binder compatibility data, based on the surface free energy

    (compatibility ratio) approach, for commonly used aggregates and asphalt emulsion binders in

    Oklahoma. Moreover, the chip seal construction practice followed by different ODOT

    Maintenance Divisions was documented and the best practice identified. This repository of

    information will be a useful resource for ODOT maintenance divisions.

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