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Structural Performance of an Instrumented Flexible Pavement

The FAA National Airport Pavement Test Facility (NAPTF) is a full-scale accelerated pavement 2 testing facility located at the FAA William J. Hughes Technical Center in Atlantic City 3 International Airport, New Jersey. Six flexible and three rigid test sections were built, 4 instrumented and trafficked as part of construction cycle one. Each test section was divided into 5 north and south wheel tracks, where the north wheel track was loaded with a six-wheel 3D (3 Duals 6 in Tandem) Boeing 777 (B777) gear and the south wheel track was loaded with a four-wheel 2D 7 (2 Duals in Tandem) Boeing 747 (B747) gear. One flexible test section with an asphalt-stabilized 8 base over a low-strength subgrade was considered in this study. All dynamic sensors, including 9 pressure cells, strain gauges and multi-depth deflectometers (MDDs) were evaluated. A multistep 10 procedure for evaluating the dynamic sensors was developed, and it included data reliability, 11 repeatability, changes in the pavement responses of shallow and deep sensors under the Boeing 12 777 and 747 gears, and comparison with a three-dimensional (3D) finite element (FE) mechanistic 13 model.

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