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Abstract
In this study, the effect of temperature on the fatigue performance of hot mix asphalt (HMA) has been investigated with the use of the scaled accelerated loading equipment Model Mobile Load Simulator. Several HMA test slabs instrumented with strain gauges and thermocouples were subjected to running wheel load under controlled environmental condition. Transverse and longitudinal strain and temperature data were acquired with the data acquisition system. The analysis of strain data indicated that the longitudinal strain was dependent on the temperature and the rate of change of temperature with time. A model has been developed to predict the resilient strain under moving load at different temperatures. Models relating fatigue life of HMA with temperature have been presented. It has been concluded that the accurate prediction of fatigue performance of HMA under wheel load should include the effect of temperature and loading. Testing pavement slabs compacted with roller compactor provides results which can identify the effects of different factors encountered in the actual field conditions.
Acknowledgements
The authors thank Maine Department of Transportation for funding this research and Mr Jon Gould of the Worcester Polytechnic Institute (WPI), Heather Bolton and Dr Jo Sias Daniel of the University of New Hampshire for their help in conducting laboratory study. The authors appreciate the technical advices provided by Professor Frederick Hugo of the University of Stellenbosch, South Africa, and Mr Johan Muller for technical services for running MMLS3 during the tests.