Preparation and Performance Study of Ultraviolet-Responsive Self-Healing Epoxy Asphalt

Area of Science:

• Materials Science
• Polymer Chemistry
• Civil Engineering

Background:

• Asphalt materials are prone to microcracking, reducing infrastructure durability.
• Developing self-healing materials can extend the service life of asphalt pavements.
• Coumarin-based compounds offer potential for reversible chemical reactions in self-healing applications.

Purpose of the Study:

• To develop a novel self-healing epoxy asphalt material incorporating coumarin groups.
• To investigate the microcrack self-repair capabilities of the developed material under specific conditions.
• To evaluate the effectiveness of the self-healing process on the material's mechanical properties and durability.

Main Methods:

• Incorporation of coumarin groups into epoxy asphalt formulations.
• Induction of microcracks in the material.
• Application of UV irradiation and heat (50 °C) to trigger self-healing.
• Analysis using fluorescence microscopy to observe crack filling.
• Mechanical performance testing, including fracture toughness measurements.

Main Results:

• Successful microcrack self-repair was achieved in the epoxy asphalt under UV irradiation at 50 °C.
• Fluorescence microscopy confirmed significant crack filling and recovery of mechanical properties.
• Repaired epoxy asphalt demonstrated a fracture toughness recovery of up to 69% of its original state.
• Synergistic effects of temperature and UV irradiation enhanced material durability and extended service life.

Conclusions:

• The developed coumarin-modified epoxy asphalt exhibits effective self-healing properties.
• The material shows significant potential for improving the longevity and performance of asphalt infrastructure.
• This research highlights the promise of smart materials in advancing civil engineering applications.