Effects of self-healing mechanism on the fatigue life of recycled asphalt mixes

This study analyzed how the self-healing potential of recycled asphalt mixtures with varying levels of RAP (0%, 10%, 30%, and 50%) affects its fatigue resistance. To achieve this objective, the specimens were subjected to controlled tensions corresponding to 25%, 50%, and 75% of the fatigue life det...

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Bibliographic Details
Published inMaterials and structures Vol. 57; no. 6
Main Authors Arruda, Sonaly Mendes, da Silva, Conrado Cesar Vitorino Pereira, de Macêdo, Ana Letícia Feitosa, Arruda, Amanda Mendes, Patrício, Jonny Dantas, de Figueiredo Lopes Lucena, Leda Christiane
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.07.2024
Springer Nature B.V
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Summary:This study analyzed how the self-healing potential of recycled asphalt mixtures with varying levels of RAP (0%, 10%, 30%, and 50%) affects its fatigue resistance. To achieve this objective, the specimens were subjected to controlled tensions corresponding to 25%, 50%, and 75% of the fatigue life determined through Indirect Tensile Fatigue Test (ITFT). Subsequently, self-healing was induced. This process involved heating the confined specimens to 45 °C for 4 h, followed by 24 h of rest at an ambient temperature of 25 °C and then carrying out ITFT tests until rupture. After testing, it was possible to quantify the self-healing index and the percentage of extension on the fatigue life achieved post-self-regeneration. The results indicate that increased RAP content leads to more significant difficulties in mobilizing asphalt binders to seal cracks, resulting in reduced self-healing capacity. However, when self-healing occurs at a lower damage level in RAP-containing mixtures, a substantial increase in fatigue life may occur. As a result, the self-regeneration process plays a subtle yet significant role in extending the lifespan of pavement. This effect is particularly effective in rectifying minor damages caused by traffic-induced stresses.
ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-024-02412-z