Paving over existing asphalt that suffers from alligator cracking will likely just delay the same structural problem. If the existing aggregate base is contaminated with subgrade material, it should also be removed. If new aggregate base is to be a component of the rehabilitated pavement section and the subgrade is clay or silt, then a geotextile may be placed on the subgrade to prevent the upward migration of fines. This will retain the structural integrity of the aggregate base. The use of Full-Depth asphalt will not require the use of a geotextile.
Structural failures are often the result of poor drainage.
Existing drainage should be evaluated and if drainage is found to be inadequate, sufficient drainage should be included in the rehabilitation plans. After all failed layers are removed, new layers should be placed on recompacted subgrade or base layers. New hot mix asphalt should be placed to a depth of at least the mini-mum required design thickness. By assessing the existing condition of the intersection, then selecting an appropriate repair method based on the assessment, we can ensure that an intersection will have the structural capacity to perform well through its design life.