Towards a better understanding of wetting regimes at the interface asphalt/aggregate during warm-mix process of asphalt mixtures

摘要

In road applications, the current challenge is to develop more ecological products while maintaining asphalt mixture performance and durability. This sustainable development politics in civil engineering leads to promote techniques saving both energy and raw materials like combining the use of warm mix asphalt concretes (WMA) with the use of reclaimed asphalt pavement (RA). However, one of the current problematic when combining WMA and RA is to assess the quality adhesion of the "asphalt/aggregate" couple that is a fundamental parameter for the good mixture properties at short time and thereby durability of this composite structure. Indeed, the reduction of the manufacture temperature and the use of an aged binder may also have consequences on adhesion quality between asphalt and aggregates. It is the reason why it is crucial to identify the most impacting factors of wetting phenomena at the interface "asphalt/aggregate". So, in this paper, the role of asphalt characteristics (viscosity, ageing, composition) as well as the one of substrate was investigated.