Effet des charges lourdes en période hivernale
|Abstract:||In cold regions, seasonal freezing induces an important increase in the bearing capacity of flexible pavements. This variation is due to the viscoelastic response of asphalt concrete and to the freezing of pore water in granular materials and soils. The pavement strengthening with frost penetration has led some transportation agencies to allow winter weight premiums (WWP). Currently, the main issue related to WWP programs is the variety of legislation for both among and within jurisdictions. This variety is caused, in part, by the lack of a rational decision criterion for the application of WWP and for the little technical documentation available on this subject. The objective of this project was to document the mechanical behavior of freezing pavements and to develop a rational criterion for the onset of winter load premiums. An experimental approach with the use of Laval University full-scale heavy vehicle simulator was considered to monitor the response of a flexible pavement built in an indoor test pit over a low plasticity clay subgrade soil. The pavement was instrumented to monitor temperature profiles, surface deflection, as well as stress, strain and moisture content in each layer. The simulator was used to apply the air freezing temperature (-10 °C) and to periodically load the pavement surface using a standard dual-wheel set (half axle) varying in the range of 4500 to 6250 kg. The results collected allowed documenting how the response of the pavement changes with respect to frost penetration, temperature and the load magnitude. The results were then compared to a similar project realized between 2013 and 2016 on a different pavement structure. This analysis was able to demonstrate that the pavement behaviour during frost can be predicted by elastic analysis. Subsequently, a damage analysis was performed under Miner’s law to establish a link between the load increase and pavement damage during frost. Finally, it has been demonstrated that the flexible pavements mechanical behaviour is directly link to the frost depth.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||24 April 2018|
|Collection:||Thèses et mémoires|
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