The concept of perpetual pavements, or long-lasting asphalt pavements, is not new. Actually, full-depth and deepstrength
asphalt pavement structures have been constructed since the 1960s.Full-depth pavements are constructed directly on subgrade soils, and deep-strength sections are placed on relatively thin granular base courses. One of the chief advantages of these pavements is that the overall section of the pavement is thinner than those employing thick granular base courses. As a result, the potential for traditional fatigue cracking may be reduced, and pavement distress may be confined to the upper layer of the structure. Both are advantages to perpetual pavements. Thus, when surficial distress reaches a critical level, an economical solution is to remove the very top layer and replace it to the same level...

点击浏览该文件