United States Department of Transportation
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Edition:Final Report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;NTL-HIGHWAY/ROAD TRANSPORTATION-HIGHWAY/ROAD TRANSPORTATION;
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Abstract:Delamination or debonding between asphalt layers is a persistent problem often encountered when analyzing pavement cores taken from Missouri’s roadways. Delaminated asphalt layers are suspected to be the primary cause of premature pavement deterioration that dramatically decreases the pavement’s service life. After a thorough review, the Missouri Department of Transportation (MoDOT) increased their minimum tack coat application rates to more closely follow national recommendations and guidelines in order to mitigate the issues with delaminated asphalt lifts. This report presents the findings of a tack coat investigation conducted by MoDOT to evaluate and verify the effects of the tack coat specification change. The source of the data and information presented in the report is from a laboratory study and field studies that evaluated the bond strength of asphalt overlays between different surface types, tack coat products, varied application rates, and environmental conditions. The laboratory study evaluated different tack coat products for bond strength between two lifts of new asphalt and between new asphalt and concrete. The laboratory study subjected a set of each tack product to freezing temperatures to monitor the effects of cold temperature. Also, the application rates were varied to determine the most optimal rate for adequate bond strength.
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