Light weight deflectometer evaluation of low volume road structural deterioration under military traffic loads

In a combat zone, military vehicles may not have the benefit of traveling on well-constructed pavements, necessitating the use of low volume roads (LVR) to transport personnel and cargo. Military vehicles can cause rapid structural damage to LVRs that are not designed to withstand increased traffic loads. Currently, rapid pavement infrastructure assessment techniques for military personnel are based on qualitative visual inspections which do not provide estimates for structural capacity of the pavement. The objective of this project was to determine whether the lightweight deflectometer (LWD) can be used as a structural evaluation tool for LVRs in contingency operations. This study explored the capability of LWD equipment in evaluating factors that influence flexible pavement structural capacity: load-induced deterioration, soil moisture, and asphalt temperature. Falling-weight-deflectometer (FWD) and LWD tests were performed to measure pavement structural condition. The LWD was shown to be applicable for LVRs experiencing military traffic. The LWD is portable, simple to use, and more suitable than the FWD for LVRs when high rut depths are permitted. LWD data trended similarly to FWD data and therefore can be recommended as an alternate to the FWD in assessing the structural condition of LVRs for contingency planning.