United States Department of Transportation
i
Critical Factors Affecting Asphalt Concrete Durability: Research Brief
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2016-10-01
[PDF-61.89 KB]
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TRIS Online Accession Number:01624687
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Edition:Research brief
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Abstract:This research evaluated changes to the composition of asphalt concrete mixtures that the Wisconsin Department of Transportation (WisDOT) should consider to improve the durability of flexible pavement constructed in Wisconsin. Based on a synthesis of current research, a laboratory experiment was conducted to quantify the effect of: (1) effective binder volume, (2) low temperature performance grade, (3) recycled binder content, and (4) polymer modification on the resistance of typical Wisconsin mixtures to aging and load associated cracking. For the types of mixtures normally used in Wisconsin, the laboratory experiment found mixture composition had little effect on aging; however, cracking resistance was significantly affected. The laboratory experiment produced a regression equation that was used to evaluate current WisDOT specification requirements. This evaluation concluded that recent specification changes made by WisDOT will improve the cracking resistance of asphalt concrete mixtures, with the greatest improvement occurring for overlays in the Southern Asphalt Zone. The regression equation was also used to recommend additional specification changes that WisDOT should consider.
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