Concrete Delamination
Freezing can cause something that is called concrete delamination.
Think of concrete like a hard sponge. Even though it feels solid, it’s full of tiny microscopic pores. When water gets trapped inside those pores and freezes, it acts like a slow-motion explosion from the inside out.
As the process repeats over multiple freeze-thaw cycles the problem becomes worse until you see the surface start to crumble.
Modern outdoor concrete is usually Air Entrained, meaning that it contains billions of microscopic air bubbles. These act like tiny cushions or “pressure relief valves” where ice can expand without breaking anything. Without these bubbles, the concrete has nowhere to go but out.
Deicing Salts are a double-edged sword and so are highly advised against. They can help to melt the ice but may also draw more water into the concrete’s pores causing more expansion under the surface.
Poor workmanship can happen If too much water gets added causing the water to cement ratio to be too high leading to weaker bonds. The concrete can also be overworked causing the entrained bubbles to be worked out of the surface making it more susceptible to freeze-thaw cycles.
