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Transportation agencies spend billions of dollars annually on pavement maintenance and rehabilitation to meet public, legislative, and agency expectations. Knowledge of the structural condition of a highway pavement is crucial for pavement management at both the network level and the project level, particularly when the system monitoring, evaluation, and decision-making are to be made in a context of multiple criteria that include structural condition. A key aspect of the performance criteria for multiple criteria decision making is that the criteria must be amenable to scaling so that it can be duly incorporated in the overall utility function. The main objectives of this research study are: 1) To develop a pavement structural strength index (SSI), scaled logistically from zero to a 100, based on the falling weight deflectometer (FWD) deflection measurements; 2) To formulate SSI in such a manner to be used as an index or employ the value of “100 – SSI” as a deduct value from pavement distresses surface index; and 3) To develop models by which the SSI could be estimated given functional class, age, and drainage condition wherever deflection measurements are not available. Extensive literature review of existing information related to pavement structural capacity assessment was conducted. Necessary data was collected from the Indiana Department of Transportation (INDOT) pavement management databases and deflection measurements available at INDOT Research and Development for both project and network levels. Information from INDIPAVE (a database that includes data on weather conditions, highway classification, traffic, and other information at over 10,000 one-mile pavement sections in the State of Indiana) were also employed. Weather information was also collected from the Indiana State Climate Office. The data includes information on 12,250 road sections from 1999 to 2007. Data was classified by pavement surface type (whether it is asphalt or concrete) and system classification (whether it is an interstate, a non-interstate but part of the national highway system (NHS), or a non interstate and not a part of the national highway system (non-NHS).

Development of a Structural Index as an Integral Part of the Overall Pavement Quality in the INDOT PMS