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- W580969306 abstract "The Colorado Department of Transportation (CDOT) recently concluded a study to implement and adopt the American Association of State Highway and Transportation Officials (AASHTO) Mechanistic-Empirical Pavement Design Guide (MEPDG) and its accompanying software into its routine pavement design practice. Implementation of the MEPDG in Colorado required local calibration of the MEPDG distress and smoothness prediction models. This paper discusses the calibration of the “global” rutting model to account for Colorado’s unique climate, traffic, and soils conditions as well as the various asphalt concrete (AC) mix types used in the State. A key challenge during the local calibration effort was to produce different rutting coefficients for each AC mix type, e.g., Marshall, Superpave, and polymer modified asphalt (PMA). Local calibration of the MEPDG global models using CDOT input data was done using nonlinear model optimization tool available in the SAS statistical software. AC rutting, unbound aggregate base rutting, and subgrade rutting global model coefficients were adjusted through local calibration. Four of the ten model coefficients were adjusted. The local calibration coefficient sr1 turned out to be different for each of the three primary CDOT AC. As expected, the PMA had the lowest value of the sr1 coefficient among three asphalt mixes, resulting in the lowest AC rutting. The goodness of fit and bias test results indicate an adequate goodness of fit with minimal bias. This local calibration effort improves the overall prediction accuracy of the rutting model and its standard error." @default.
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- W580969306 date "2014-01-01" @default.
- W580969306 modified "2023-09-23" @default.
- W580969306 title "Mix Specific Rutting Model Calibration in Colorado" @default.
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