Análise do fenômeno fadiga em diferentes condições de frequência e temperatura.

Abstract

The pavements are an integral part of the development of the regions, ensuring infrastructure and connections between the most remote areas. Being the most used, flexible pavements have a useful life of up to 10 years, provided that periodic maintenance is carried out. In the search for maintaining the quality and durability of the pavement, there are some techniques, such as the use of modified binders, to delay the occurrence of defects, like fatigue cracks. The main factors intervening in the fatigue life of the pavement are the asphalt binder, the properties of the aggregates and the focus of this study: frequency and temperature variations. To this end, the mechanical characterization of the mixture was performed, followed by the fatigue life test, considering the variation in temperature and frequency. After this analysis, it was possible to observe that pavements behave in different ways when exposed to different frequencies or temperatures. When exposed to high frequency values (30 Hz), the mixtures had a shorter fatigue life. It was also observed that the pavement, when subjected to higher temperatures, presented lower stiffness and greater deformation, requiring fewer load applications to reach the failure condition. At lower temperatures (10ºC), it was observed that stiffness influenced the increase in the number of applications necessary to reach rupture, indicating greater resistance of the mixture to fatigue. However, the stiffness from the asphalt binder and transmitted to the complete asphalt mixture caused different types of rupture.