ABSTRACT
Moving Deflectometer Devices (MDDs) are used to evaluate the pavement structural condition at the network level. Studies have shown that certain indices acquired based on vertical surface deflections from MDDs can be used to reliably estimate critical pavement strains, which in turn can be used in pavement distress investigations. Since 3D-Move has the capability of modeling moving load and the resulting dynamic pavement response time histories, it is ideally-suited to evaluate pavement responses generated by these devices travelling at different speeds. Using MDD field trials at the MnROAD test site the measured responses were used in the calibration of the 3D-Move model. 3D-Move model provided a good match with a variety of pavement responses that included measured surface deflection bowls and horizontal strains at the bottom of the Asphalt Concrete (AC) layers. Using the calibrated 3D-Move software, an analytical investigation was then undertaken to explore relationships between critical pavement responses and surface deflection indices from MDDs.
