De-bonding of hot mix asphalt pavements in Washington State : an initial investigation.
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2008-11-01
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Edition:Final technical report.
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Abstract:Recent evidence in Washington State indicates that de-bonding of HMA surface layers may become a significant
problem. “De-bonding” describes a condition where adjacent layers of HMA lose adhesion to one another and can
become separated. Typically, design and construction practice is to build in a certain amount of bonding, however
the appropriate amount, testing and techniques are still under debate. For WSDOT pavements, which are generally
thick and long-lasting, this de-bonding is thought to be more prevalent between the surface layer (usually applied
as a preservation overlay) and underlying layers. This de-bonding may contribute to early failure of the HMA
pavement surface layer, which can increase pavement preservation costs. This study gathers initial evidence on debonding
in Washington State and attempts to define the problem scope and potential performance impacts.
Specifically it attempts (1) determine if de-bonding occurs, (2) identify possible de-bonding mechanisms, (3)
define the scope of de-bonding in WSDOT pavements, (4) determine de-bonding impacts on pavement
performance, and (5) identify the role of tack coats in de-bonding.
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