Update and Documentation of MDOT Warranty Process and Distress Thresholds
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Update and Documentation of MDOT Warranty Process and Distress Thresholds

Filetype[PDF-4.00 MB]

  • English

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      08/26/2016 to 12/31/2018
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    • Abstract:
      Pavement warranty is an innovative contracting procedure, which has been adopted in Mississippi to enhance pavement performance and protect the investment in pavement construction since 2000. MDOT uses converted deduct points to monitor/evaluate the distresses and the distress thresholds are in the form of deduct points, which are not as straightforward as use of direct quantities. Moreover, the validity and applicability of continual use of these conversion equations have become problematic with time, because the equations were empirically developed in 1990s reflecting the data, experience, and technologies at that time. Currently, 100% collection is now possible and can be used in lieu of the sampling scheme in MDOT. Therefore, the objectives of this study are to research the performance of the current pavement warranty program, and the possible ways of updating new thresholds for the warranty program. The survival analyses were conducted to compare the pavement performance for warranty contracting versus the general non-warranty contracting in MS. The bootstrapping method was utilized to process the skewed historical distress measurement data into normal distributions. The upper bound of confidence interval or standard deviations of the normalized distress measurement data was determined as an alternative method to rebuild the threshold for each distress type. The confusion matrix was administrated to consider a smooth transition of updating the thresholds from the current deduct point based system to a new measurement based system. A Visual Basic based macro program was developed in MS Excel to implement the new thresholds. Eventually, the classification accuracy index, the one sample t-test, and the Levene’s test were employed to validate the automated data collection technology currently used for the non-warranty pavements maintained by the state. The results have shown that the average performance of warranty pavements is superior to that of the non-warranty pavements in Mississippi. The thresholds based on the 1.5 σ method with the normalized non-warranty distress data could be an alternative to rebuilding the distress thresholds. The current automated data collection technology is not accurate enough for project-level pavement distress surveys required by the warranty pavements; therefore, project level analysis will continue to be done by staff augmentation and QC/QA of the automated method.
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