Rehabilitation of existing pavements is the greatest pavement priority facing local, state, and federal transportation agencies. The use of Hot Mix Asphalt (HMA) overlays presents a long term and economical solution to the pavement rehabilitation problem. If HMA overlays are placed directly over a Portland Cement Concrete (PCC) pavement, the resulting pavement system is prone to developing reflection cracking distress in the HMA overlay. One of the most economical and long term performing strategies to eliminate reflection cracking is to fracture the existing slab prior to the placement of the HMA overlay. This report presents a procedure for determining the required thickness of an HMA overlay placed over fractured PCC slabs. The report is based on a comprehensive national study of HMA overlaid fractured slab systems. The fundamental structural overlay thickness determination of State Highway and Transportation Officials (AASHTO) structural deficiency approach.
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