PERFORMANCE OF RECYCLED ASPHALT PAVEMENT AS GRANULAR LAYERS OF NEW FLEXIBLE PAVEMENT IN LIGHT OF PAVEMENT MECHANICS CONCEPTS: A REVIEW (Atena Editora)

Abstract

A possible solution to the pavement shortage is the use of local alternative materials that have lower costs than traditional ones, with the product from milling asphalt pavement being one of these alternative materials, as long as good technical quality is guaranteed. The pavement recycling technique emerged in mid-1915 and the term RAP (Reclaimed Asphalt Pavement) of American origin is used internationally to characterize the milled material. Research has been carried out to reuse this material, however, the deepening of knowledge of its characteristics and mechanical performance parameters in the face of traffic demands is still notable. This article provides a comprehensive analysis of the use of recycled asphalt pavement (RAP) as granular layers in new flexible pavements, using an approach based on the principles of pavement mechanics. The study reviews existing literature, addressing both the benefits and challenges associated with incorporating RAP into paving projects. Examines the evolution of pavement design models, highlighting the importance of considering not only the modulus of resilience, but also permanent deformation when designing flexible pavements. Furthermore, the results of previous studies on the performance of RAP as a granular layer are discussed, addressing its mechanical response under different loading and environmental conditions. The need to understand the specific properties of RAP, such as its heterogeneous composition and the effect of residual asphalt binder, is highlighted for effective application on pavements. Through a critical review of existing literature, the article offers valuable insights for researchers and professionals in the field of paving, contributing to the advancement of knowledge and practices related to the use of RAP in granular layers of flexible pavements.