Self-healing in asphalt mixtures can be induced by adding particles that are susceptible to heating by electromagnetic microwaves. This process allows the closure of microcracks caused by the fatigue phenomenon and can extend the service life of the asphalt pavement. In this article, the self-healing index of asphalt mixtures without and with the addition of steel slag (15% and 65.7%), steel fibers, (0.2% and 0.4%), and graphite powder (15% and 65.7%) was evaluated. The index was determined after subjecting the mixtures to fatigue damage, microwave heating, rest, and fatigue damage again. Results showed that all additions led to mixtures susceptible to microwave heating and with healing capacity. A higher self-healing index was observed when the mixture was produced with slag than with graphite powder. It was found that the use of a higher content of steel fibers was more effective for healing, and for successful healing, the mixtures must be heated to temperatures ranging between 50°C and 75°C. The results also showed that it is possible to achieve high healing values without having to subject the mixtures to microwave heating.

Resumo: Este artigo tem por objetivo apresentar o estado da arte do desenvolvimento de novas misturas asfálticas autorregenerativas. As misturas asfálticas autorregenerativas são materiais asfálticos capazes de fecharem as trincas oriundas de tensões de fadiga, incrementando a vida de serviço do pavimento e dispensando a remoção da camada de revestimento asfáltico. No Brasil, o tema ainda não ganhou destaque nas publicações acadêmicas em razão de existirem pesquisas relacionadas com o tema ainda em desenvolvimento. No presente trabalho foi realizado um levantamento dos últimos artigos publicados em revistas internacionais e das principais contribuições de pesquisadores. Assim, são apresentados os métodos que permitem baixar a viscosidade do ligante asfáltico de misturas aplicadas em campo a fim de acelerar o processo e o nível de autorregeneração. Por fim, este artigo propôs uma série de recomendações para pesquisas futuras a fim de aprimorar o desenvolvimento destes tipos de misturas.Palavras-chave: Misturas asfálticas autorregenerativas, Fadiga, Indução eletromagnética, Micro-ondas, Microcápsulas.Abstract: This article aims to present the state of the art of new self-healing asphalt mixes development. The self-healing asphalt mixes are materials able to closing cracks from fatigue stresses by themselves, increasing pavemEnet life service and sparing the asphalt pavement removal. In Brazil, the issue has not yet gained prominence in academic publications due to the existence of research related to the topic still being developed. In this research, a survey of the last articles published in international journals and the contributions of the researchers regarding the subject was made. Thus, this article presents methods that allow reducing the constructed asphalt binder viscosity, in order to accelerate the self-healing process. Finally, this article proposes a set of recommendations for future researches in order to improve the development of these types of mixes.