Long term performance of low temperature asphalt pavements containing reclaimed asphalt

Abstract : Roads are the most widely used mode of transportation in the world, and a country’s development is often measured in terms of its total paved roads mile age. Pavements are an essential part of our social network and asphalt concrete is the main material used for manufacturing them. Currently, the European road network is not much growing anymore and mostly needs only maintenance. In a context of increasing demand of performance and durability of asphalt mixtures, a sustainable, durable and economical conceptionis required. Indeed it could be oriented towards a self sufficient road providing its own raw materials through recycling while limiting the use of energy and other natural resources for its maintenance.The combination of warm mix asphalts (WMA) technologies and high rates of reclaimed asphalt pavements (RAP)appears as a solution to achieve both energy and natural resources savings. But it is still ambiguous in terms of durability. Therefore, an experimental program is set up to show the evolution of the performances of such asphalt concretes with time, highlighting the notion of ageing mostly related to the bituminous fraction. At the bitumen scale, the long term assessment is carried out in particular by applying the δ-method compare with GPC measurements both on model samples with controlled asphaltene content and laboratory aged ones. At the asphalt mixture scale, a comparison studyis carried out between a reference HMA and WMAs with 0%- 50% of RAP submitted to a laboratory ageing procedure. The long term performances of the mixtures are compared by means of complex modulus and fatigue testing. Results show a relation between the evolution of the structure of the bitumen with ageing and the mechanical performances. Short term ageing is less important for warm processes. After ageing, the overall tendencies are similar for all processes.
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Miguel Pérez-Martinez. Long term performance of low temperature asphalt pavements containing reclaimed asphalt. Materials. École centrale de Nantes, 2017. English. ⟨NNT : 2017ECDN0009⟩. ⟨tel-02184202⟩

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