Implementation of the MEPDG for Flexible Pavements in Idaho
作者： Fouad Bayomy , Sherif M El-Badawy , Ahmed Awed
DOI:
关键词: Engineering 、 Axle load 、 Dynamic modulus 、 Predictive modelling 、 Atterberg limits 、 Smoothness 、 Geotechnical engineering 、 Subgrade 、 Regression analysis 、 Rut
摘要: This study was conducted to assist the Idaho Transportation Department (ITD) in implementation of Mechanistic-Empirical Pavement Design Guide (MEPDG) for flexible pavements. The main research work this focused on establishing a materials, traffic, and climatic database MEPDG implementation. A comprehensive covering all hierarchical input levels required by hot-mix-asphalt (HMA) binders typically used established. influence binder characterization level accuracy predicted dynamic modulus (E*) investigated. prediction NCHRP 1-37A viscosity-based Witczak Model, 1-40D-binder shear (G*) based model, Hirsch Gyratory Stability (GS) model also Levels 2 3 inputs unbound materials subgrade soils were developed. For Level material characterization, two models First, simple R-value regression as function soil plasticity index percent passing No. 200 sieve developed historical R-values at ITD. Second, resilient (Mr) predictive estimated laboratory measured Mr values, collected from literature, granular soils, typical default average values ranges R-value, (PI), liquid limit (LL) using ITD data. traffic classification weight data 25 weigh-in-motion (WIM) sites analyzed. Site-specific (Level 1) axle load spectra (ALS), adjustment factors, number axles per truck class Statewide regional ALS factors impact performance studied. Sensitivity terms cracking, rutting, smoothness key parameters part study. recommended design reliability criteria Finally, plan local calibration validation distress/smoothness conditions
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