Researchers at Drexel University have discovered a groundbreaking solution to tackle snow and ice buildup on roads and sidewalks during winter months. By adding paraffin wax to the concrete mixture, the resulting substance can naturally melt snow and ice, reducing the need for harmful deicing chemicals and excessive plowing.
Paraffin Wax as a Phase Change Material
Paraffin wax, commonly found in candles and cosmetics, acts as a “phase change material” (PCM). When temperatures drop, the wax transitions from a liquid to a solid state, releasing latent heat that helps prevent ice formation and promote melting.
Effectiveness of PCMs
Two types of PCMs were tested: paraffin-filled tubes and paraffin-infused porous lightweight aggregate. Both proved effective in melting snow, with the tube-embedded version performing slightly faster. However, in colder environments, the porous aggregate showed greater efficiency due to capillary pore pressure delaying the freezing of paraffin, enabling prolonged heat release.
Applications and Support
This innovation holds promise for various applications, particularly at airports where clearing runways is crucial. The Federal Aviation Administration supports this research as part of its Heated Airport Pavements Project.