Study of the effects of fatigue and aging of bitumen in asphalt pavements

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Document Type : Original Article

Authors

1 Road and transport. Payam noor University. Tehran shomal

2 PhD of Civil Engineering, Road and Transportation, Payame Noor University, Tehran, Iran

10.22034/road.2022.346930.2055

Abstract

Asphalt pavements are exposed to many destructive factors and under the influence of all these factors, the service life of the road is shortened. Identifying these parameters and studying the mechanisms of their effects on the performance of asphalt pavements leads to slowing down the deterioration process of the pavements and thus extend the service life of the roads. Bitumen burnout and aging is one of these factors that play an important part in the occurrence of a number of asphalt pavement damages. Bitumen aging leads to changes in the rheological properties (flow and deformation) of the bitumen and affects the performance of the pavement. The physicochemical properties of the aged bitumen lead to the formation of fine cracks in the pavement, through which water can penetrate the joint surface of the bitumen and aggregate. As a result, the bond strength between the bitumen and aggregate is reduced which leads to the rupture of the bond between the bitumen and aggregate and the bond within the bitumen membrane, all these eventually leads to an increase in pavement failures. In this article, the effects of this important factor on pavements were examined based on previous research.

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