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Technical advisory guide (TAG) for bonded wearing course pilot projects.
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  • Abstract:
    A bonded wearing course (BWC) is a gap graded, ultra thin hot-mix asphalt (HMA) mixture applied

    over a thick polymer modified asphalt emulsion membrane. The emulsion membrane seals the

    existing surface and produces high binder content at the interface of the existing roadway surface and

    the gap-graded mix all in one pass. The gap-graded HMA provides an open surface texture to allow

    water to flow through the surface. A BWC can be applied and opened to traffic quickly, usually

    within 15 minutes, without sanding or tracking. Bonded wearing courses are primarily used in high

    traffic areas as a surface treatment over HMA and PCC surfaces. It can be placed over structurally

    sound pavements as a maintenance treatment, and may also be used in new construction and

    rehabilitation projects as the final wearing course.

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