Abstract
Methanol-modified melamine-formaldehyde (MMF) microcapsules have been demonstrated as feasible for asphalt applications. However, the full range of their effects on asphalt and asphalt mixture performance remains unclear. To systematically address this, this paper synthesized MMF microcapsules via in situ polymerization and evaluated their impact on the temperature sensitivity, self-healing capacity, and fatigue resistance of both asphalt and asphalt mixtures. Additionally, three potential environmental factors (damage degree, healing time and healing temperature) influencing the self-healing ability of asphalt mixtures containing MMF microcapsules were assessed. The findings show that incorporating microcapsules enhanced the self-healing rates of asphalt and asphalt mixtures by 73.6 % and 119.2 %, respectively. While there was a moderate reduction in the low-temperature performance, the microcapsules contributed positively to anti-aging properties, fatigue resistance, and particularly high-temperature performance, evidenced by a 30.6 % increase in dynamic stability compared to matrix asphalt. Among the environmental factors considered, damage severity had the most significant effect on self-healing, leading to a notable reduction in healing rates.
Published Version
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