this post was submitted on 31 Mar 2025
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In the US in states where they experience cold enough winter temperatures that the ground freezes for months of the year the asphalt (or tarmac) used on the roads is softer than in warmer states. This is so that when the ground shifts due to the freeze the road surface can flex and move, however sometimes the road surface cracks and fractures. When that happens they’ll use a flexible joining/sealing compound to fill the cracks to keep them from eroding further and wearing away while still allowing the road to continue to shift back and forth during the freeze and thaw.
Frost lines are a common consideration in building codes and in the northern Midwestern US the frost line can be several feet deep.