Assessing the Effectiveness of Lower Impulse Loads on Reinforced Asphalt Pavement

New Hampshire Department of Transportation NHDOT has installed fiberglass grid reinforcement in several flexible roadways throughout the state in an effort to address fatigue cracking and extend the service life. Currently, no field test method exists to evaluate the in situ performance of asphalt reinforced pavements. During the fall of 2014, data was collected on New Hampshire Route 101 using impulse load testing equipment. Project 15680S, Analysis of the Falling Weight Deflectometer (FWD) deflection measurements at the highest load levels did not yield conclusive results of the benefit of grid reinforcement. This project proposes evaluating the previously collected FWD deflection measurements at the lower load levels and the Light-Weight Deflectometer (LWD) data to determine the possible benefit of reinforcing grid in the asphalt layer. The objective of this project is to develop a methodology to quantify the structural benefit from in situ fiberglass grid reinforcement within the asphalt concrete layer to determine layer coefficient values for the reinforced asphalt layer to be used in NHDOT pavement design. It is anticipated that this work will be accomplished through a Cooperative Research and Development Agreement with Cold Regions Research and Engineering Laboratory (CRREL).