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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