Two recent paving projects featured in the April edition of Roads & Bridges magazine tell the tale of a new, greener future for civil engineering specifications relating to asphalt projects.
• The use of recycled asphalt shingles (RAS) is gaining speed after a test in King County, Washington, where a 2 mile long stretch of roadway was overlaid with a 2-in.-thick layer of hot-mix asphalt (HMA) containing both reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS). The goal was to show that the addition of the shingles to the HMA had no significant negative impact on pavement performance, and the early testing seems to bear that out.
Locally, North Carolina (NC) has a standard specification that allows RAS from manufacturers’ scrap only. The regulations on RAS for other states can be found here (see full article below for link).
Please see full article below for more information.
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