United States Department of Transportation
i
Work plan for special design features and crack sealing maintenance.
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2013-09-01
[PDF-1.34 MB]
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Abstract:The Alaska DOT&PF wants to construct and maintain asphalt concrete (AC) paved highways in a way that minimizes roadway lifecycle costs while preserving acceptable
performance. Thermal cracking is a natural feature of most paved Alaska roadways that influences both long term maintenance costs and the driving public’s perception
of road performance. This work plan for a research test section provides construction and maintenance procedures to address what is arguably the most severe form of
thermal cracking — major transverse thermal cracks.
A newly constructed AC pavement surface will be modified with the addition of presawn transverse cracks (placed according to specified spacing and cut depths). Based
on previous experience it is expected that many of the presawn cracks will become active transverse thermal cracks. Alaska experience suggests that this controlled form
of thermal cracking result in a “better thermal crack” in terms of ride roughness and visual appearance. Alaska experience further suggests that such cracks should require
little if any sealing maintenance over the life of the pavement. The work plan includes long term monitoring and maintenance methods that will be used to evaluate the
performance of the experimental sections.
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