Use of recycled asphalt as an aggregate for asphalt mixtures: literary review

Over the years, we have seen the increase in the use of recycled asphalt in asphalt mixtures. The following article shows the review work (through database search) performed on the literature concerning the use of that type of asphalt, as it produces a great economic and ecological advantage. Nevertheless, it could mostly be found that its use in asphalt mixtures was limited to little RAP (recovered asphalt pavement) content, as it was considered that a good quality mixture with higher quantities could not be obtained. However, there is a growing trend of higher proportions of RAP in the mixtures. The objective of this review is to show through different authors and the results of their studies: performance, life and resistance to fatigue, rutting and cracking of RAP in asphalt mixtures, in different proportions and types of mixing techniques in which it can be used. The results show an increase in their properties with rejuvenating, increased resistance to fatigue, the rutting with the mixture of rap binders and virgin binders and better rap behavior if used with other green technologies such as warm asphalt mixture; allowing the implementation of increasing amounts of RAP, up to 60%, achieving higher performance of the final resulting mixture.