3D-finite element pavement structural model for using with traffic speed deflectometers

ABSTRACT

The traditional practice for pavement structural capacity evaluation is mostly dependent on the falling weight deflectometer (FWD) measurements. However, this practice has several challenges due to its stationary nature. Recently, a Rolling Weight Deflectometer (RWD), capable of measuring the pavement deflections at regular traffic speeds, has been introduced into the market. This research aims to develop a finite element (FE) model simulating pavement structural response under the moving RWD loads. This model could be further utilised for accurately estimating pavement layers mechanical characteristics. The model was successfully validated utilising the RAPTOR (a commercially available RWD) data collected on the National Center for Asphalt Technology (NCAT) test track. A good correlation between the simulated and the measured values was found – yielding an average root mean square percentage error (RMSPE) of approximately 2.40% between the RAPTOR and the FE deflections.

KEYWORDS:

• Pavement structural evaluation
• FWD
• traffic speed deflections
• backcalculation
• Rolling Weight Deflectometer

Acknowledgements

This research did not receive any specific grant from funding agencies in the public, commercial, or not–for–profit sectors.

Disclaimer statement

This paper’s contents, which do not constitute a standard, specification, design, or bidding document, reflect the views of the authors who are solely responsible for the facts, accuracy, and integrity of the data presented herein – and do not necessarily reflect nor endorse the official views or policies of any agency or institute. Trade names, where mentioned, were used solely for information purposes and not commercial purposes or product endorsement.

Disclosure statement

No potential conflict of interest was reported by the author(s).