United States Department of Transportation
i
Design and Construction of Ultra Thin Overlays as an Alternative to Seal Coats
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2018-03-01
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[PDF-5.89 MB]
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TRIS Online Accession Number:01667490
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:Friction loss is one of the most critical issues faced by agencies responsible for preserving a pavement structure. There are various methods used for surface treatments including seal coats, slurry seals, and ultra thin asphalt concrete overlays. Ultra thin overlays have increased in popularity due to their lack of noise and improved ride quality, as well as their reduced overall cost owing to the reduced layer thickness. This study had three major objectives: (i) determine the best mix type for use as an ultra thin overlay, (ii) evaluate the volumetric-based criterion that is currently used to determine the optimum binder content for mixes used in ultra thin overlays using performance tests relevant for surface mixes, and (iii) identify the properties of the tack coat that are required to construct such mixes in the field. The performance evaluation was conducted using laboratory techniques including the Hamburg Wheel Tracking Device and the Three Wheel Polishing Device. Out of the six potential gradations or aggregate structures that could be used as an ultra thin overlay, three were found to be suitable based on the performance tests. It was also observed that the optimum binder content, as defined by the volumetric criterion, was also generally the optimum based on performance tests conducted in the laboratory.
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