How Asphalt Survives Cold Canadian Conditions
Asphalt in cold Canadian conditions faces extreme pressure from snow, ice, freeze-thaw cycles, and moisture. In Calgary, winter weather can cause water to seep into small cracks, freeze, expand, and weaken the pavement over time. Understanding how asphalt reacts to cold weather can help property owners protect roads, driveways, and parking lots before small issues turn into costly repairs.
It is easy to forget about our asphalt surfaces, but asphalt works hard through the harsh Canadian cold. Asphalt in Alberta faces extreme elements. Between snow falling onto it, melting into water, and then freezing into ice, asphalt needs proper installation and ongoing protection. To help prevent Calgary roads from becoming dangerously icy, The City of Calgary implements the following plan:
When road surfaces are below -5 degrees Celsius, with a forecast of colder temperatures, a sanding chip mixture (3% salt, 97% fine gravel) is used.
The City applies approximately 30,000 to 40,000 tonnes of road salts annually in order to keep Calgary on the move in difficult winter driving conditions.
How Road Salt Affects Asphalt
Salt has no effect on properly installed asphalt. Of course, this assumes that a professional asphalt paver installed high-quality hot-mix asphalt, which consists of sand, stone, and petroleum. This blend needs to be precise in order to help the surface withstand snow, ice, freezing temperatures, and winter maintenance products.
When asphalt is installed correctly, road salt does not directly damage the asphalt itself. Problems usually happen when water enters cracks, freezes, expands, and weakens the surface over time. That is why professional installation, proper drainage, and regular maintenance are so important for asphalt in cold Canadian conditions.
The Environmental Impact of Road Salt
Environment Canada‘s 5-year research plan concluded that:
Road salts pose a risk to plants, animals and the aquatic environment. Environment Canada implemented a Code of Practice to minimize their effect on the environment and has been successful in minimizing the risk.
It is important to remember that salt remains one of the most effective winter safety tools, as outlined by Environment Canada. Over time, changes have been made to the ratio of sand and salt depending on temperature, snowfall, and road conditions. Currently, this is considered one of the best solutions for helping reduce risk while allowing for safer winter driving.
Why Salt Does Not Cause Potholes
It is a common misconception that potholes are formed by salt. In reality, potholes are usually caused by excess water, snow, and ice entering cracks in the road surface or along the edges of the pavement.
Over time, this water freezes and expands, then contracts again as temperatures rise. This freeze-thaw process weakens the asphalt and the base underneath it. As the water freezes, the road surface can rise. Once it melts, the area beneath the surface may become hollow or separated.
When vehicles drive over this weakened area, the pressure can cause the asphalt to collapse. This is what creates a pothole.
What Actually Causes Potholes in Winter
Potholes are most often caused by a combination of moisture, freezing temperatures, cracks, poor drainage, and repeated traffic pressure. Calgary’s freeze-thaw cycles can make this problem worse because pavement may freeze and thaw many times throughout the winter and early spring.
For asphalt in cold Canadian conditions, prevention is key. Sealing cracks early, maintaining proper drainage, and repairing damaged areas before winter can help reduce the risk of potholes forming.
What to Do About Potholes in Calgary
If you see a pothole on a major road in Calgary, report it to The City of Calgary.
If the pothole needs immediate repair or if you have a pothole in your driveway or parking lot, Calgary Paving can help with professional asphalt repair and patching. Give Calgary Paving a call and get a free estimate!
About Calgary Paving
Calgary Paving is a trusted, locally owned company with decades of experience delivering high-quality paving solutions for residential, commercial, and industrial projects. We specialize in building roads, parking lots, sports courts, and driveways that stand up to Alberta’s extreme climate. Committed to sustainability and durability, we use premium materials and best practices to ensure every project is completed on time, within budget, and to the highest standard.