Abstract
The temperature of the asphalt concrete AC is one of the most important environmental factors that influences flexible pavement performance. The possibility hazard of temperature change raises attention in how it may affect the deterioration rates (deflection, strain and stress distributions) in flexible pavement and how pavement service life would be changed as a result. A change in the AC temperature directly influences the stiffness of the asphalt-bound layers, which modifies the stress statues inside the pavement. This alteration in stress can influence the stiffness of the underlying unbound layers since they generally show stress reliance. Due to these relations are nonlinear, the additional pavement life lost at higher than average temperature is not replaced by savings at lower than average temperature. For that, the deterioration amount are overvalues when average pavement temperatures are used for determining the asphalt stiffness. The objective of this research was to study the pavement temperatures throughout the year in Egypt on performance and life of seven pavement sections with different stiffness or thickness using mechanistic-empirical method to investigate the most influential characteristic under temperature change for improving the design of pavement structures. The results revealed the significance of the impact that climate change may have on the performance service life of flexible pavements. These changes may impact the pavement life cycle cost and thus their impact on future maintenance requirement should be investigated.
Highlights
Cumulative distresses, such as permanent deformation and fatigue cracking, practically define failure of the pavement surface layer
The objective of this research was to determine the variations in the predicted pavement damage ratio and life as well as the changes in pavement performance measured in terms of stress, strain and deflection distributions on the pavement surface and through layers due to temperature variation in Egypt using mechanistic-empirical method
It can be noted that the increasing of layers thickness is more effective than layers stiffness in increasing both pavement lives and decreasing damage factor where the both lives getting closer to degree of congruence at thicker and lower stiffness section
Summary
Cumulative distresses, such as permanent deformation and fatigue cracking, practically define failure of the pavement surface layer. Excessive distresses lead to major defects, like potholes Those distresses may result from many factors, e.g., improper choice of materials and respective proportions, excessive traffic loadings (more or heavier loads than anticipated in design), environmental effects (temperature and moisture conditions), aging of asphalt layers, among others. The most important climatic agent that significantly influences the mechanical behavior of all pavement layers and the overall performance and life of the pavement is temperature [1, 2 and 3]. The temperature effect on bearing capability, performance, damage and life of asphalt pavement cannot be ignored [4 and 5]. The variation in temperature directly influences the stiffness of the asphalt layers, which alters the stress, strain and deflection conditions through the pavement. This variation can influence the stiffness of the underlying unbound layers since they usually display stress, strain and deflection dependence [6]
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