Why do sidewalks have blocks, instead of being solid?
In: 205
It is to either reduce or control cracking. Concrete over time will crack for various reasons (freezing and/or heating, rain, ground settling, etc). Large slabs of concrete are more likely to crack. Also some of what you see are joints on the surface. A crack here is more likely, but it won’t show because it is on the part you don’t see.
There are also logistical reasons. Manpower limitations and how concrete dries / cures means only a certain amount can be poured, smoothed, etc at a time. It isn’t always possible to do one big pour, so the sectioned concrete hides the fact that they were done on different days.
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