New pavement technology promises safer, ice‑free winter roads

Every driver knows how challenging driving on a slippery surface can be. Despite road crews' efforts to combat the winter weather using sand and salt, current techniques have drawbacks. Regular snow removal and the use of these substances are not environmentally friendly and can damage road surfaces, corrode vehicles, and ruin our footwear. Moreover, maintaining roads in good condition requires a lot of work and specialized equipment.

Prevention is always better than cure, but previous concepts like heated roads were too expensive. However, an article published in the scientific journal ACS Omega suggests an innovative solution. They have developed pavements that can remove snow and ice by themselves. The principle relies on using microcapsules with a chloride-resistant mixture in the asphalt.

How does this technology work? Microcapsules containing a salt mixture are added to the asphalt before it sets. The main component is sodium acetate, alongside other ingredients like silicon dioxide, sodium bicarbonate, and blast furnace slag, all coated with a polymer.

During tests, some traditional asphalt components were replaced by microcapsules. The result? This technology effectively melts snow and prevents ice formation in the long run. Even a five-centimetre layer of asphalt with capsules proved sufficient to prevent snow accumulation, unlike conventional pavement, which would require snow removal.

Notably, the materials used in the mixture are relatively inexpensive and sourced from waste, making this a practical and economical option. The costs of building such roads should not significantly increase, and the reduction in winter road maintenance expenses could be substantial. Although further tests are needed, scientists assume that the de-icing properties of a five-centimetre layer of asphalt will last for seven to eight years, which would be a significant achievement.