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Assessment of microplastics production from waste plastics-modified asphalt pavement
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Roads made with recycled plastic can shed tiny microplastic particles when it rains, according to lab tests simulating traffic and water flow over these surfaces. The good news: this pavement releases roughly 1,000 times less microplastic pollution than the wear-and-tear from regular car tires, suggesting that reusing plastic waste in roads isn't a major new source of environmental microplastic contamination compared to sources we already live with.
Post-consumer recycled plastics (PCRP) have been increasingly utilized in asphalt pavement applications as the world moves towards a circular economy. However, it is unknown whether microplastics (MPs) could be generated in significant amounts during the subsequent pavement life cycle. This study developed methods to detect and quantify the potential microplastic generation from asphalt pavement materials containing PCRP (specifically, linear low-density polyethylene) using the Hamburg wheel-tracking test and a water permeability test. MPs were quantified by Nile Red staining followed by fluorescence microscope imaging. Environmental scanning electron microscopy (ESEM) and energy dispersive spectroscopy (EDS) were further conducted to characterize the nanoscale morphology of the embedded PCRP. The results showed that the generated MPs could reside at water/air interface, in bulk water, or with asphalt binder and aggregates in the sediment; and their amounts varied depending on the polyethylene dosage and type. The potential environmental impact of MP production from PCRP-modified asphalt pavement needs to be examined under the context of MP particle releases from other emission sources, notably, the tire wear particle generation when rubber tires meet the road. Our assessment indicated that while there was a potential of MPs release from the PCRP-modified asphalt, the up-scaled level of their release from a pavement was estimated to be about three orders of magnitude less than the tire wear rubber particles.
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Evaluation of Microplastic Leaching in Plastic Roads
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Researchers tested whether roads made with recycled plastic mixed into asphalt shed harmful amounts of microplastics into the environment when subjected to simulated traffic wear. The early results were reassuring: microplastic levels released were well below the threshold considered risky for ecosystems, suggesting plastic roads could be a safe way to reuse plastic waste instead of sending it to landfills. That said, this is preliminary data from lab testing, so more research is needed before we know the long-term real-world effects on the environment and, indirectly, on human health.
Investigating the potential release of microplastics from recycled plastic modified asphalt pavement
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Lab-made asphalt mixed with recycled plastic was tested under conditions mimicking long-term wear, then checked for microplastic release. Both the recycled-plastic asphalt and regular control asphalt showed similar particle contamination, making it unclear whether the recycled plastic itself released microplastics.
Investigating the Potential Release of Microplastics from Recycled Plastic Modified Asphalt Pavement
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Researchers investigated whether microplastics are released from recycled plastic-modified asphalt pavement, examining the potential for road surfaces incorporating plastic waste to become a secondary source of microplastic pollution in surrounding environments.
Microplastics Generated from Recycled Plastic Modified Asphalt Pavement: Method Development and Laboratory Evaluation
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This study developed laboratory methods to measure how much microplastic is shed by asphalt pavement made with recycled plastic, filling an important knowledge gap as recycled-plastic roads are promoted as a sustainability solution. The research raises the concern that pavements incorporating waste plastic could become a previously unrecognized source of microplastic pollution over their service life.
Is road pavement wear a source of microplastics in stormwater runoff?
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Researchers investigated whether road pavement wear contributes microplastics to stormwater runoff, testing pavement materials and runoff samples from urban areas. The study found that pavement abrasion does release plastic-associated particles into stormwater, adding to the range of urban microplastic sources.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.