![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
In this study, a model hot mix asphalt (HMA) pavement was constructed in the laboratory and tested under repeated wheel load applications using Model Mobile Load Simulator 3 (MMLS3). This study presents a discussion on the background of MMLS3, production of test slabs, use of various strain gauges, loading, data acquisition using strain gauges in various directions and analysis of test results. Analysis of data showed the effect of wheel load on fatigue performance of the pavement in terms of strain history and cracking. Different phases of strain history have been identified and their role on fatigue performance discussed. A rational approach of calculation of strain corresponding to failure load applications has also been presented. A finite element model of MMLS3 pavement showed the usefulness of numerical solutions over closed form solutions with respect to effects of boundary conditions. The finite element model presented in this paper successfully described the behavior of the pavement loaded with the MMLS3 in terms of effect of variation of pavement thickness and relative magnitude of strains in different directions. Based on the observations from several trials involving preparation of test pavement slabs and, loading and testing, it is concluded that the MMLS3 can be used for evaluation of HMA for fatigue characterization. A proper protocol for preparation of slabs, loading and testing with the MMLS3 is being developed. Once developed, the protocol will be used for more rigorous HMA material characterization in the laboratory.
Acknowledgements
The authors thank the Maine Department of Transportation for providing support for this study. The authors also appreciate the help provided by Mr Brian Prowell from the National Center for Asphalt Technology (NCAT).