United States Department of Transportation
i
High-Performance Thin Overlays New Jersey Department of Transportation [case study]
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2021-11-01
[PDF-1.53 MB]
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Abstract:This is one of five case studies highlighting FHWA’s Every Day Counts initiative known as Targeted Overlay Pavement Solutions (TOPS). TOPS integrates innovative overlay procedures into practices to improve performance, lessen traffic impacts, and reduce the cost of pavement ownership. The New Jersey Department of Transportation (NJDOT) specifies high-performance thin overlay (HPTO) as a fine-graded polymer-modified asphalt mixture that uses 100 percent high-quality crushed stone with a nominal maximum aggregate size of 3/8 inch. HPTO is designed using a modified Superpave design methodology with restrictions on reclaimed asphalt pavement and natural sands. The typical lift thickness for HPTO is 1 inch. NJDOT uses HPTO as a multi-solution tool but primarily as a preservation application on pavements in good to fair condition in need of minimal repairs (less than 10 percent). HPTO can be combined with other preservation strategies such as microsurfacing, slurry seals, or micro-milling as warranted by unique project conditions. NJDOT research shows the timing of HPTO application is critical to get the maximum pavement life extension. According to NJDOT, HPTO applied to existing pavement in “good” condition, more than doubles the service life compared to HPTO applied to fair condition pavements.
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