Évaluation de l'effet de la teneur en eau sur le comportement à l'orniérage et sur le module complexe des enrobés semi-tièdes comportant des enrobés recyclés

Abstract

The asphalt industry is constantly seeking ways to reduce energy cost and negative impacts on the environment. In recent year, Low Energy Asphalt (LEA) or half warm-mix asphalt (HWMA) have been developed to significantly reduce these issues. The main feature of these mixes is the fact that the coating is done at temperature below 100 °C by a foaming process with water contained in the aggregates cold and wet. The experimental program was setup to evaluate the effect of the amount of added water to half warm-mix asphalt on behavior of mix. The evaluation was carried out with the rutting resistance and complex modulus test on a dense-graded surface mix commonly used in Quebec, an ESG-10. 15 % of reclaimed asphalt pavement (RAP) was used with water content varying from 1 % to 9 % based on the weight of RAP. Tests have shown that it is original content as influencing the handling of coated and uncoated the residual water content is almost identical for all LEA. The tests showed that half warm-mix asphalt have smaller deformation with low number of cycles. The initial rate of deformation is higher for LEA and rutting are very similar to hot mix asphalt (HMA) in high number of cycles. The results of complex modulus show that the norm of the complex modulus decreases with the increase of the initial RAP water content. In addition, the effect of water content has more impact for frequencies below 1,0 Hz. Overall, the effect of initial water content added to the half warm-mix asphalt with addition of RAP does not seem to have a significant impact on the behavior of rutting and the complex modulus in comparison with the HMA.

Date	12 Aug 2013
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Alan Carter (Supervisor) & Daniel Perraton (Co-supervisor)