Date Approved


Embargo Period


Document Type


Degree Name

M.S. in Engineering


Civil & Environmental Engineering


Henry M. Rowan College of Engineering


Mehta, Yusuf


Pavements--Overlays; Pavements, Asphalt


Civil and Environmental Engineering


This study investigates the potential of falling weight deflectometer (FWD) data for use in quantifying the level of interlayer bonding achieved in pavements. Data was obtained and used from the Federal Aviation Administration's (FAA) National Airport Pavement Test Facility located in Atlantic City, New Jersey. In this test facility, a section of the pavement had encountered a loss of bond between lifts of the surface hot mix asphalt (HMA) layer. FWD tests had been performed at locations throughout the pavement, on a monthly basis for the duration of the loading period. The FWD data, along with detailed material property data, was available through the FAA Airport Technology Research and Development Branch's web page.

The material properties and FWD data were used to calculate the stiffness moduli for each layer in the pavement using forward calculations. It was determined that calculated stiffness moduli for surface layers can be used as a parameter to determine the quality of interlayer bonding. To further investigate the level of bonding, a tack failure ratio was determined for each section, by modifying an equation for the equivalent modulus of two combined asphalt layers, and that was correlated to the slip between layers. This study developed a framework for the application of FWD data in identifying and quantifying interlayer slippage in HMA pavements.