Winter brings snowy joys, but also major road issues. Drivers face dangerous potholes as soon as snow melts. Many blame the quality of the asphalt. However, the main culprit is simple physics.
The Power of Water and the Freeze-Thaw Cycle
Water is the primary reason for road deterioration. We call this the freeze-thaw cycle. Asphalt may look solid at first glance. However, it develops micro-cracks over time from traffic.
Melting snow allows water to enter these cracks. Problems arise at night when temperatures drop below zero. Water turns into ice and expands. Ice takes up about nine percent more space than liquid water.
This expansion creates huge pressure within the road base. Ice literally pushes the asphalt and widens existing cracks. The road then loses its internal stability and structure.
How Potholes Form Under the Wheels
Ice turns back into water when the temperature rises. It leaves behind an empty space or a void. This hollow space can no longer support vehicle weight.
Cars and trucks apply pressure to these weakened spots and the top layer of asphalt bends and eventually breaks. Chunks of asphalt then break away easily. At the end of the process, tires of the passing cars slowly kick these pieces out of the hole. This is how the deep potholes form every spring.
Road salt also makes the situation worse. Salt allows water to stay liquid at lower temperatures. This increases the number of freeze-thaw cycles each season. More cycles mean more damage to the road surface.
Conclusion and Advice for Drivers
Roads are most vulnerable during large temperature swings. Therefore, you must be more careful after snow melts. Even small cracks quickly become deep traps for tires. Regular maintenance and sealing cracks are the only ways to slow this process.
