Development of flexible pavement database for local calibration of MEPDG : volume 1.
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2011-06-01
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Edition:Final report.
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Abstract:The new mechanistic-empirical pavement design guide (MEPDG), based on the National Cooperative Highway
Research Program (NCHRP) study 1-37A, replaces the widely used but more empirical 1993 AASHTO Guide
for Design of Pavement Structures. The MEPDG adopted a mechanistic-empirical pavement analysis and
design procedure by using material properties, traffic and climate data for local conditions as input. Among
material properties, resilient modulus (Mr) of underlying soil and aggregate layers is one of the important
parameters for the analysis and design of flexible pavements. Also, dynamic modulus (E*) of the asphalt mixes
and rheological properties of asphalt binders are needed to predict pavement distresses for its design life. To
this end, Mr data of 712 samples from five unbound subgrade soils, 139 samples from four stabilized subgrade
soils, and 105 samples from two aggregates in Oklahoma were evaluated to develop stress-based models.
Among selected models for unbound subgrade soils, the universal model outperformed other stress-based
models. For stabilized soils and aggregates, the octahedral model, recommended by the MEPDG, performed
better than the other models. Also, reasonably good correlations were established to predict Mr values of these
materials by using routine material properties (i.e., gradation, index properties). Furthermore, MEPDG input
parameters of three performance grade (PG) binders, collected from three different refineries in Oklahoma,
were determined as per Superpave
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test methods. It was observed that the rheological properties (i.e.,
viscosity, dynamic shear modulus (G*)) of the same PG grade binders varied significantly based on their
sources. The present study is expected to provide ODOT with useful data and correlations that can be used to
calibrate the MEPDG for local materials and conditions.
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