Performance evaluation of reclaimed asphalt pavement (RAP) aggregate in concrete pavements: a state-of-the-art review

Recycling flexible pavement generates huge quantities of Reclaimed Asphalt Pavement (RAP) aggregates, which are sometimes deserted in landfills or open dump yards. Use of this otherwise waste material in concrete may be a viable option to reduce both the ever-increasing demand for natural aggregates and minimize the landfill area utilization due to the dumping of RAP. Many researchers studied the influence of RAP aggregates on concrete performance and suggested various pre-treatment methods for the processing of RAP aggregates. A comprehensive review on the influence of RAP aggregates on concrete performance is needed to raise awareness among engineers and contractors. This paper presents an extensive review on various properties of concrete which vary with the use of RAP aggregates in concrete. Also, reviewed the process for the preparation of RAP to utilize as aggregate in concrete. The addition of pre-treated RAP aggregates increases the workability of concrete. The use of RAP aggregates diminishes the mechanical and durability characteristics of concrete. Literature shows that the use of processed RAP aggregates along with supplementary cementitious materials or fibers can improve the performance of RAP concrete. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.