Marine Microplastics Repurposed to Enhance Asphalt Road Durability

Researchers from the National Research Council (CNR) in Portici, Italy, have discovered that marine microplastics can be repurposed to improve the performance of asphalt mastics, promoting recycling and reducing climate change indicators. The study investigated the feasibility of using marine microplastics as modifiers in two types of bituminous mastics, finding that incorporating these microplastics improves the mechanical and rheological properties of the mastics. The study also evaluated the potential for plastic leaching and applied a Life-Cycle-Assessment methodology to quantify the climate change indicator for 1m² of road pavement using the obtained mastics.

Key Takeaways:

• Marine microplastics can be repurposed to enhance the performance of asphalt mastics, improving road durability and promoting recycling.
• The study investigated the feasibility of using marine microplastics as modifiers in two types of bituminous mastics, at a concentration of 6wt %.
• Incorporating marine microplastics improves the mechanical and rheological properties of bituminous mastics, with a softening point improvement of 9.8 °C compared to the neat bitumen.
• The addition of marine microplastics into neat bitumen produces a stiffness reinforcement by over 80 % compared to the conventional mastic.
• Leachate heavy metal concentrations decrease by up to 85 %, attributed to the use of marine microplastics.
• The climate change indicator is reduced by up to 16 % compared to traditional solutions, attributed to the extended service life provided by marine microplastics in the mastics.
• The study presents a promising recycling strategy, offering a sustainable solution for road engineering applications.
• The research was conducted by a team of researchers from the National Research Council (CNR), led by Yanqi Wang.
• The study was published in the journal Results in Engineering, through Elsevier.

Statistics:

• 9.8 °C: improvement in softening point of bituminous mastics compared to the neat bitumen.
• 80 %: stiffness reinforcement of neat bitumen compared to the conventional mastic.
• 14 mg/kg: heavy metal concentration in neat bitumen.
• 2 mg/kg: heavy metal concentration in the modified mastic.
• 16 %: reduction in climate change indicator compared to traditional solutions.
• 6wt %: concentration of marine microplastics used in the study.
• 1m²: area of road pavement used in the Life-Cycle-Assessment methodology.

Sources:

• National Research Council (CNR), "Turning marine microplastics into components for producing innovative bituminous mastics: Boosting sustainability in road pavements."
• Results in Engineering, "Turning marine microplastics into components for producing innovative bituminous mastics: Boosting sustainability in road pavements."
• Elsevier, "Results in Engineering."