![]() Find a library where document is available.There was confirmation of the models used in the HVS experiments for unbound materials. For permanent asphalt layer deformation the permanent strain determined in the laboratory from Repeated Simple Shear Tests-Constant Height (RSST-CH) should be multiplied by a factor of 80 for coarse mixes, and a factor of 90 for fine and fine plus mixes, to result, in mm, in the measured downward permanent deformation of the asphalt. a laboratory load corresponds to 15 in-situ loads) for fine and fine plus mixes and approximately five for the coarse mixes. Although both values may be somewhat high, the shift factor was found to be approximately 15 (i.e. Pavement foundations are the layers below the surface material, typically asphalt concrete or portland cement concrete (PCC). The information in the CPG applies to all concrete pavement. For asphalt fatigue prediction a shift factor was determined between laboratory fatigue and in-situ fatigue. The Concrete Pavement Guide (CPG) provides a comprehensive overview of current new construction- reconstruction, preservation, and rehabilitation strategies used by the Department for concrete pavement. ME model empirical components were then calibrated so that measured performance and predicted performance would match. There was comparison of the deflections calculated by CalME and the FWD deflections measured at intervals by WesTrack during trafficking, to ensure reasonably well predicted pavement response. ![]() Then, for the total duration of the experiment, each section was simulated, hour by hour. In terms of recorded distresses, measured rutting and FWD deflection, time of load applications, and temperatures at different depths, WesTrack experimental results were imported into the CalME database. Laboratory and Falling Weight Deflectometer (FWD) tests were used to determine material parameters for incremental-recursive model calibration. ![]() The second step, where CalME models were calibrated through 26 original sections from the WesTrack experiment, is dealt with in this paper. As a first step, ME models of the software tool CalME were calibrated by two California Heavy Vehicle Simulators (HVSs) trafficking 27 flexible pavement accelerated test sections. ![]() Calibration of Mechanistic-Empirical Models for Flexible Pavements Using the WesTrack Experiment (With Discussion)Īn integral part of the California Department of Transportation's (CALTRANS') commitment to adopting a mechanistic-empirical (ME) pavement design method is ME model calibrations. ![]()
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