Why Sidewalks Get Cracks?

If you're using concrete to make a sidewalk, the shrinking concrete will cause cracks to appear as it dries. ... Contraction joints are placed in fresh concrete before the concrete dries and has a chance to create its own joints, which we call cracks.

Is it normal for sidewalks to crack?

Like many other seemingly indestructible construction materials, concrete expands and contracts when subjected to changes in temperature. If concrete sidewalks were poured as one continuous slab, weather-related expansion and contraction would cause them to crack, buckle and break.

What is most likely to cause a crack in the sidewalk?

Generally speaking, ground movement is one of the most frequent causes of cracking, especially with sidewalks, driveways, and roads. The growth of a tree's roots or an excessive freeze and thaw cycle can cause the ground to push upwards on the concrete, causing it to crack and break - a process known as heaving.