Geri dönüştürülmüş plastikli asfalt laboratuvar testlerinde dayanıklılık gösteriyor

Adding discarded plastic to asphalt could divert waste from landfill, but such roads may release microplastics as they deteriorate. A Penn State-led team compared conventional asphalt with a mixture containing shredded low-density polyethylene, crushed stone and reclaimed pavement. Laboratory tests exposed samples to repeated wheel loading, hot water, moisture, heat and water pressure. The team then collected debris and used infrared imaging to compare individual particles with chemical reference signatures. Under the combined stresses, the plastic-modified asphalt generally remained more intact and produced a lower measured level of particles resembling polyethylene. The researchers suggest that greater durability may limit particle release. However, asphalt binder and polyethylene share infrared features, making particle identity and origin difficult to separate. The experiment also used a single formulation and plastic source under controlled conditions. Consequently, it cannot establish what happens across different materials on real roads, where traffic, rainfall, sunlight, temperature and ageing interact. Field sampling and long-term monitoring are still required.