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Temperature adaptability of asphalt pavement to high temperature and significant temperature difference

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Document pages: 16 pages

Abstract: The temperature adaptability of asphalt pavement is very important because they have potential impact on pavement structure design, especially in areas experiencing significant temperature difference. This paper develops a finite element (FE) model and takes Turpan Xiaocaohu highway in southern Xinjiang as a case study project. The highway often experiences such adverse environmental conditions (temperature difference: 25.5 ° C; July 14, 2008). The model adopts generalized Kelvin model and Burgers model. The time-varying tire pressure is considered. In order to guide the pavement structure design and control pavement diseases in this area, seven alternative pavement structures are selected to simulate and analyze the pavement temperature field and mechanical responseses. It was observed that the influence of air temperature had the greatest impact on Str-1, possibly due to the thinnest asphalt course. Moreover, when rutting depth, maximum shear stress of the asphalt course, deflection on the pavement surface, and compressive strains at the subgrade top surface were taken as the evaluation indices, the adaptability of asphalt pavements using compound base courses had obvious advantage due to their strong absorption and reflection of load impact. The adaptability of seven structures analyzed in this paper decreased in the following order: Str-5 > Str-6 > Str-4 > Str-2 > Str-m > Str-1 > Str-3. In addition, it broke the traditional view that asphalt pavement with a flexible base had the poor ability on rutting resistance. Besides, it also suggests that when the thickness of asphalt courses was equivalent, increasing the thickness of chemical-treated base courses would help with the deformation resistance, and vice versa.

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