United States Department of Transportation
i
Reducing roughness in rehabilitated asphalt concrete (AC) pavements
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1998-12-01
[PDF-69.99 KB]
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TRIS Online Accession Number:00765948
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:A recently completed study entitled, "The Investigation of Development of Pavement Roughness" (FHWA-RD-97-147), initiated by the Long Term Pavement Performance (LTPP) program, provides an answer to the question of how much different rehabilitation treatments reduce roughness. A component of the study investigated selected asphalt concrete (AC) rehabilitation treatment factors in reducing roughness. Specific factors considered include: overlay mix type (recycled and virgin), overlay thickness, and surface preparation of the existing AC surface prior to overlay (minimal and intensive preparation). Key findings were as follows: regardless of the roughness before overlay, the roughness for each test section at a site after the overlay fell within a relatively narrow band, the range of which varied from project to project; even thin overlays substantially reduced the roughness of a pavement; and 85% of the sections that received either a 50-mm or 125-mm AC overlay had an International Roughness Index (IRI) of less than 1.2 m/km. 4 p.
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