United States Department of Transportation
i
High Performance Thin Overlays New Jersey Department of Transportation
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2022-03-01
[PDF-1.74 MB]
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Edition:Final Report
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Abstract:High-performance thin overlay (HPTO) mixture is a fine-graded polymer-modified asphalt mixture that uses aggregate with a top size of approximately ⅜ inch. It is designed using a modified Superpave design methodology with restrictions on the use of reclaimed asphalt pavement and sand. It is performance tested for rutting and cracking resistance during design and production. HPTO mixes are typically used in maintenance and pavement preservation applications but can also be used as a leveling course when extended staging times are expected for temporary pavements during construction. It is a rut-resistant and durable mixture most often placed at a thickness of 1 inch either on a milled or unmilled surface. HPTO has been used as a maintenance application on high-volume interstate projects and on heavy-duty parking lots. The New Jersey Department of Transportation (NJDOT) has increasingly been using HPTO mixes for preventive maintenance and pavement preservation projects statewide. This report is a case study of NJDOT’s experience and includes background, specifications, implementation, design, planning, construction, and performance.
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