Abstract
In composite pavements, such as whitetopping and overlay, it is important to ensure the bond between asphalt layer and concrete layer for long-term performance of the pavements. The bond strength is expected to be influenced by characteristics or texture in the interface between asphalt layer and concrete layer. So, we have been searching a method to make the optimistic interface characteristics. In this study, we have tried two types of method for surface treatment using water jet: one with high pressure and large amount of water and another with super high pressure and small amount of water. We investigated the relationship between the interface texture and bond strength, varying operational parameters including water pressure, operation speed and amount of water. As the results, it was found that there is an optimum value of a parameter, which was introduced to express the energy of water and is a function of the operational parameters, to obtain high bond strength
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