Effet de cycles de chargements sur les propriétés thermomécaniques des mélanges traités au ciment-bitume

Abstract

The rise in the cost of bitumen following the energy crisis has prompted, in recent years, companies specializing in road construction developed new technologies for recycling pavements that are sustainable and efficient in bituminous mix. Quite a few countries, such as Canada, are investing and strongly encouraging cold recycling technologies using aggregates. Reclaimed Asphalt Pavement (RAP). Indeed, the recycling technique with cement-bitumen treated materials (CBTM) is very profitable and promotes sustainable development. The lubricating effect in traditional hot mixes is the heated bitumen causing high energy consumption, whereas in CBTM it is given by the water containing in the bitumen emulsion which gives, in combination with the cement, a good cohesion. Although CBTM presents an interesting alternative in the construction of pavements, several works remain to be carried out in terms of its thermomechanical properties to arrive at its efficient formulation and understand the evolution of its behaviour over time. Indeed, this material, which is treated with bitumen emulsion, seems to exhibit an evolutionary behaviour over time due to several factors (temperature, water content, traffic, etc.). Therefore, the main objective of this mastery is to evaluate the evolution of the thermomechanical behaviour of the CBTM before and after repeated loading cycles. To put this work into practice, the number of loading cycles has been varied. The results obtained showed that the number of loading cycles influences the stiffness modulus of CBTM. The evaluation of the viscoelastic behaviour has been validated by complex modulus tests. The results obtained will contribute to a better understanding of what is happening throughout the life of the pavement and will make it possible to know the right moment of intervention in the case of rehabilitation.

Date	1 May 2022
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Alan Carter (Supervisor) & Simone Raschia (Co-supervisor)