Development of Pavement Performance Prediction Models for Preservation Treatments : Volume 2
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Development of Pavement Performance Prediction Models for Preservation Treatments : Volume 2

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      NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
    • Abstract:
      The implementation of a pavement preservation program was initiated in Fiscal Year (FY) 2005 at the Illinois Department of Transportation (IDOT) by appropriating funding for four specific pavement preservation treatments. The types of treatments included micro-surfacing, slurry seals, cape seal, and bituminous surface treatments (also known as chip seals). The scope and funding level for the state’s nine highway districts has expanded over the years. As a result, several years of performance data was collected from the projects constructed since the inception of the program. In this study, the performance of preservation treatments used by districts as part of the pavement preservation program were evaluated. After treatments were applied, pavement condition prediction models were developed for nine preservation treatments. Two methodologies were followed in developing the models. The first is solely based on the collected data when historical pavement condition data were sufficient. Due to the lack of data for many of the treatments, an alternative method was used to develop models. A multi-criteria decision-making method known as the analytic network process (ANP) was used to integrate expert opinion collected through questionnaires into the model development. The proposed model form is consistent with the existing condition rating survey CRS prediction models with a single slope, with the addition of project-specific factors to adjust the deterioration rate. The model variables included the existing pavement condition prior to the treatment, traffic, and truck percentage, along with the base deterioration rate. According to the modeling results, chip seals, slurry seals, and Half-SMART treatments were among the shortest-lived treatments, with an average service life of 3–4 years. For micro-surfacing treatments, single-pass and double-pass, could extend the service life to approximately 6 and 7 years, respectively. The average service life extension for cape seal treatment was more than 7 years, whereas cold in-place recycling treatment, with surface overlay and surface treatment, can extend pavement service life by approximately 8–10 years. It was also found that the performance of the ultra-thin bonded wearing course UTBWC treatment can be comparable to that of the micro-surfacing treatments, by extending the pavement service life by 6 years on average with a wider range of variability.
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