United States Department of Transportation
i
Evaluation of Tack Coat Materials on Longitudinal Joints in Louisiana
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2018-02-01
[PDF-1.20 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:One of the advantages of asphalt pavements is that they can minimize traffic disruptions by being paved and opened to traffic quickly. Often, asphalt paving is performed while traffic is maintained in an adjacent lane. The disadvantage of this construction technique is it leads to the formation of longitudinal joints. A longitudinal joint is a construction feature that is present when two or more lanes are constructed adjacent to each other. They are formed when a previous placed mat is allowed to cool (cold lane), and at some other period of time the adjacent lane is paved (hot lane). The disadvantage of longitudinal joints are the distresses they create, such as separation, cracking and raveling, that cause a rather sound pavement structure to deteriorate sooner than expected. Multiple longitudinal joint construction techniques have been studied and are currently used in multiple states including Louisiana. This research project primarily focuses on tack coat materials and their influence on density, permeability, and shear strength at longitudinal joints.
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