Review of PCR Methodology

摘要

This study was conducted to review the Pavement Condition Rating (PCR)211u001emethodology currently used by the Ohio DOT. The results of the literature search 211u001econducted in this connection are described in the report. An analysis of the PCR 211u001edata collected by the ODOT in the past 11 years (1985-95) indicated that there 211u001ewere some distresses which were rarely observed in the past. The reasons for such 211u001eoccurrences and the use of this information to enhance the current system are 211u001ediscussed in the report. Statistical method known as: Classification Tree, was 211u001eused to analyze the PCR data for (1) rating the pavements, and (2) assigning the 211u001emaintenance and/or rehabilitation (M&R) actions, when the distresses of the 211u001eindividual pavements were known. The results of this analysis indicated that due 211u001eto non-linear nature of PCR, this model is able to assess the PCR better than the 211u001ecurrent linear model of estimating the PCR. An expert opinion survey was designed 211u001eand conducted to collect data for developing new weights of pavement distresses 211u001eusing a combination of statistical methods: 'Classification Tree' and 'Portional 211u001eOdds Model'. The PCR values obtained from new and old distress weights were 211u001ecompared and the results of these comparisons are discussed in the report. 211u001eStatistical analysis of the PCR data for the year 1996 was performed to determine 211u001ea suitable sample size which can be used to survey the network for collecting the 211u001ePCR data of the network for Pavement Management purposes and selecting the 211u001epavements for inclusion in the annual M&R program of ODOT. This report contains 211u001erecommendations for revising the list of distresses of each pavement type, 211u001edeveloping a non-linear model to assess the pavement condition and M&R needs of a 211u001egiven pavement, a suitable sampling procedure for surveying the network and 211u001erevising the definitions of some distresses of each pavement type.