Title: Considerations regarding the influence of climatic conditions on pavement with asphalt layers
Abstract: Recent climate changes have led to the occurrence of numerous distresses in asphalt layers from flexible pavement. Romania is faced with large differences in seasonal temperature: -15°C to -20°C in winter, and +35°C to +40°C in summer, with these variations leading to permanent deformation, fatigue and thermal cracking. The Romanian Norm used to design a pavement structure with asphalt layers stipulates the calculus of fatigue damage ratio at the bottom of asphalt layers and limits the vertical strain value at a subgrade level. This is possible by establishing the stress and strain state using specialized software. In this norm, the recommended values for asphalt mixture stiffness are the minimum ones given for an equivalent temperature of 15°C. However, what happens when the temperature changes? Moreover, what is the influence of the vehicle speed? This paper has the goal of emphasizing the time behavior change of a pavement structure and concerned with the fatigue damage ratio at the bottom of asphalt layers and vertical strain at the subgrade level in a pavement structure under the action of Romanian axle loads. The calculus is based on stiffness experimental values obtained on asphalt mixture in a laboratory. The results obtained from calculus are presented as influence graphs.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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