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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Published in | Materials and structures Vol. 57; no. 6 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Dordrecht
Springer Netherlands
01.07.2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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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. |
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ISSN: | 1359-5997 1871-6873 |
DOI: | 10.1617/s11527-024-02412-z |