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• W610592800 abstract "The AASHTO pavement design procedures were developed as a result of the AASHO Road Test conducted in the late '50s and early '60s. The developed design methods are empirical and relate pavement performance measurements and the loss of serviceability directly to the traffic volume and loading characteristics, the modulus of subgrade reaction, layer coefficients, and environmental factors that were present at the road site. The resulting design equations have been generalized to make them applicable to broader sets of design variables. In the 1986 AASHTO design guide, the equations were enhanced to include design reliability, the resilient modulus of the subgrade soil, material variability and drainability, and construction quality. Further, the design guide permits the user to use overall standard deviations applicable to the local conditions. These values of standard deviation are used to determine the reliability design factors. Large values of standard deviation result in pavement designed at a higher level of reliability than supposed. Therefore, any uncertainty in standard deviation will result in uncertainty in the reliability level. Since the Ohio Department of Transportation (ODOT) has adopted the AASHTO design equations for new pavement design, it was considered needful to conduct a research study that would determine the deviations in traffic and performance prediction parameters and the overall standard deviations applicable to Ohio conditions. Pavement test sites were selected to represent the statewide distribution of pavement designs in Ohio, characterized by such factors as material type, functional classification, and different climatic and soil regions. Continuous traffic data collection was accomplished by the use of weigh-in-motion devices. Pavement serviceability index (PSI) was measured by Ohio noncontact profilometer. Core samples were obtained and several laboratory tests were conducted to determine the as-constructed material properties and variability of the design input parameters. Comparison of predicted and observed performances based on approximately four years of data indicated that AASHTO equation does not predict the performance of flexible pavements in Ohio. The predicted and the observed performance for rigid pavement sites were essentially the same that is no change in the observed and the predicted PSI, however, these observations were based on short term performance data. The overall variance estimates for flexible and rigid pavements were, however, not obtained due to lack in the change of performance data for most sections." @default.
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• W610592800 date "1994-11-05" @default.
• W610592800 modified "2023-09-24" @default.
• W610592800 title "RELIABILITY OF AASHTO DESIGN EQUATION FOR PREDICTING PERFORMANCE OF FLEXIBLE AND RIGID PAVEMENTS IN OHIO. FINAL REPORT" @default.
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