Calibration of WVDOH IRI-Based PSI and SCI Equations
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2022-12-31
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Edition:Final Report 05/6/2019 – 9/30/2022
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Abstract:The West Virginia Department of Transportation – Division of Highways (WVDOH) uses a condition assessment manual, which engages various indices combining broad categories of distresses for evaluating asphalt/concrete pavements. The indices assist WVDOH in planning pavement management strategies in a cost-effective and timely manner. Therefore, the reliability of the condition evaluation information is essential for WVDOH to develop credible pavement management strategies. However, it has been over 20 years since the manual’s development in 1997. WVDOH observed a few issues with some of the indices, particularly the present serviceability index (PSI) and structural cracking index (SCI), as follows: (1) inconsistency between the smoothness acceptance limits expressed in international roughness index (IRI) and PSI values estimated from the IRI limits and (2) the current SCI equation heavily favoring lower cracking severities since the use of automated data collection vehicles. This project was conducted to calibrate the current WVDOH PSI and SCI equations to resolve these issues. Phase 1 of this project calibrated the current PSI equation by comparing the two sets of IRI values calculated from the golden-car parameters and the quarter-car parameters of model passenger vehicles found in the literature review. The current SCI equation was calibrated in Phase 2 by analyzing the historical alligator and longitudinal crack data collected from 1998 to 2021. The results of this project will provide WVDOH with the potential to handle the issues and an opportunity to enhance the state’s pavement management practices. Also, the approaches used in this project can be applied to other transportation agencies with similar issues as cost-effective methods to calibrate outdated pavement condition indices.
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