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Biobased Spore Microcapsules for Asphalt Self-Healing.

Erik Alpizar-Reyes1, José L Concha1, Francisco J Martín-Martínez2,3

  • 1LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, Concepción 4081112, Chile.

ACS Applied Materials & Interfaces
|June 30, 2022
PubMed
Summary

This study introduces biobased spore microcapsules for self-healing asphalt pavements. These microcapsules effectively encapsulate rejuvenators, enhancing pavement durability and reducing maintenance costs.

Keywords:
aged bitumenasphalt self-healingbiobased spore microcapsulesbituminous materialsrejuvenatorsspore microcapsulessporessporopollenin

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Biotechnology

Background:

  • Asphalt pavements suffer damage from aging and traffic, leading to costly repairs and environmental concerns.
  • Self-healing mechanisms using encapsulated rejuvenators offer a sustainable solution to mitigate asphalt degradation.
  • Microcapsule resilience to environmental factors is crucial for effective pavement self-healing.

Purpose of the Study:

  • To develop and evaluate biobased spore microcapsules for encapsulating rejuvenators in asphalt pavements.
  • To investigate the encapsulation efficiency and release profiles of rejuvenators from spore microcapsules.
  • To demonstrate the self-healing capability of rejuvenator-loaded spore microcapsules in aged bitumen.

Main Methods:

  • Natural spores (Lycopodium clavatum) were chemically treated to create clean encapsulants.
  • Sunflower oil was used as a rejuvenator, with optimal sporopollenin-oil ratios determined.
  • Vacuum, passive, and centrifugal encapsulation techniques were tested, with characterization via microscopy and thermal analysis (TGA, DSC).

Main Results:

  • Vacuum encapsulation yielded the highest efficiency (93.02 ± 3.71%).
  • Microcapsules demonstrated stability up to 204 °C.
  • Biobased spore microcapsules successfully healed cracks in aged bitumen within 50 minutes.

Conclusions:

  • Extremely resistant biobased spores are effective for encapsulating rejuvenators, creating resilient self-healing asphalt pavements.
  • Vacuum encapsulation is the optimal technique for loading rejuvenators into spore microcapsules.
  • This innovative approach offers a sustainable and cost-effective solution for extending asphalt pavement lifespan.