Impacto da ativação do ligante asfáltico do fresado na curva granulométrica de misturas asfálticas recicladas

Abstract

In the literature it is common to assess the degree of activation (DoA) of reclaimed asphalt binder (RAP) from the asphalt binder perspective, but there is lack of studies that seek to understand the impact of this phenomenon on the aggregate properties of recycled asphalt mixtures (RAM). In this context, the objective of this study is evaluating the impact of RAP binder partial activation on the gradation curve of RAM. Staged of binder extraction were carried out in two RAPs to achieve different levels of binder activation. After this process, the gradation curve was obtained for each sample. Then, using a control granulometric curve (without RAP), hypothetical RAMs were created in the percentages of 20%, 40% and 60% of RAP, considering the RAP size distribution after different binder activation scenarios. The results indicate that there was a significant impact of the RAP binder partial activation on the gradation curve of the RAM, mainly for RAP percentages above 40% with DoA between 40% and 60%.