The project developed a process for the selection of appropriate rehabilitation strategies for the ranges of pavement types and conditions found in the United States.
The American Association of State Highway and Transportation Officials (AASHTO) Guide for Design of Pavement Structures
outlines a process for pavement rehabilitation selection that includes three phases: (1) problem definition, (2) potential problem solutions, and (3) selection of preferred solution. Although the process identifies the elements involved in each stage, it does not provide guidance on the ranges of factors and conditions associated with the appropriate use of each specific rehabilitation strategy. Thus, research is needed to address the technical issues associated with the selection of appropriate rehabilitation strategies and to provide highway agency personnel with the guidance needed to consider rehabilitation alternatives.
The research included a review of relevant literature and current state departments of transportation practices relative to pavement rehabilitation, identification of the items that must be considered in the selection of rehabilitation strategies, and development of a process for the evaluation and selection of appropriate pavement rehabilitation strategies. The process address the aspects of data collection, pavement evaluation, selection of rehabilitation techniques, formation of alternative rehabilitation strategies, life-cycle cost analysis, and selection of a preferred rehabilitation strategy. The agency final report has been distributed to all state departments of transportation, and is available on the NCHRP website as NCHRP Web Document 35.