The Experimental Investigation of Fatigue Life of Hot Mix Asphalt with Different Air Void Contents, Aggregate Type and Bitumen Grade at Low Temperature

Document Type : Regular Paper


1 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

2 M.Sc. Graduated, Faculty of Civil Engineering, Semnan University, Semnan, Iran

3 Assistant Professor, Faculty of Engineering, University of Guilan, Rasht, Iran


Fatigue behavior of Asphalt pavement is dependent on different parameters, including the bitumen, Aggregate, and mixture design. This study aims to investigate the effects of different air void contents of asphalt mixes prepared using two common bitumen types in Iran, 60/70 and 85/100, and limestone as well as silica aggregates on the fatigue life of the asphalt mixes at 5℃. First, the optimal amount of bitumen was calculated for each aggregate using the Marshall test. Then, to determine the fatigue behavior of the asphalt samples, indirect tensile tests were performed with controlled stresses at the levels of 100, 200, and 300 kPa. The results indicated that the 60/70 bitumen sample had a longer fatigue life than the 85/100 bitumen sample. The effect of the changing the bitumen type from 60/70 to 85/100 on fatigue life is more noticeable than the effect of the changing the air void content. Furthermore, it was revealed that lime aggregates have a higher fatigue life in comparison to silica aggregates, and the influence of increasing the air void content on fatigue life reduction is larger than that of changing the aggregate type. Eventually, some models were proposed to describe the fatigue life of asphalt mixes with different materials and different air void contents based on experimental studies and numerical analyses.


Main Subjects

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