The main objective of this paper is to study the effects of haversinse and triangular loading waveforms on the fatigue life of Hot Mix Asphalt (HMA) specimens. Effects of load duration, rest period and stress level are also studied for the asphalt mixtures at 25oC. | Study of loading waveform loading duration rest period and stress level on fatigue life of asphalt mixtures Engineering Solid Mechanics 3 2015 93-102 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm Study of loading waveform loading duration rest period and stress level on fatigue life of asphalt mixtures Ali MansourKhaki Alireza Samdzadeh and Majid Jebalbarezi Faculty of Civil Engineering Iran University of Science and Technology Tehran Iran ARTICLE INFO ABSTRACT Article history The main objective of this paper is to study the effects of haversinse and triangular loading Received October 6 2014 waveforms on the fatigue life of Hot Mix Asphalt HMA specimens. Effects of load duration Accepted 2 February 2015 rest period and stress level are also studied for the asphalt mixtures at 25oC. An indirect tensile Available online test with strain control was performed to determine the fatigue life of asphalt. The fatigue tests 2 February 2015 were performed at two stress levels 170 and 250 kPa two waveforms haversine and Keywords Hot mix asphalt triangle three load duration 100 200 400 ms and two rest period to load duration ratios 4 Fatigue life and 9 . The obtained results showed that fatigue life of haversine waveform is less than fatigue Loading waveform life of triangle waveform. As the area under the loading curve is increased stress level is Duration and rest period increased or deformed effect of rest period on the fatigue life decreases. On the other hand xperimental study as the tire contact area is increased the induced tire pressure reduction decreases its destructive effects on the asphalt layer. As the load duration is decreased fatigue life will increase. This effect is more pronounced for lower stress levels than the higher stress levels. 2015 Growing Science Ltd. All rights reserved. 1. Introduction Several traffic and environmental factors affect the deterioration of roads. A substantial part of
