Why do sidewalks have blocks, instead of being solid?
In: 205
Concrete cracks. You know how when dirt dries up in the summer and gets hard, it often gets big cracks in it? When concrete gets hard, it gets cracks in it too. When the concrete is still wet, the workers will use a tool that makes a groove across the concrete. That groove makes the concrete a little weaker there, so as the concrete gets hard and starts to crack, it’ll usually crack along that groove. That means you can control where the crack goes and kind of hide it. That makes it look better, and it helps keep chunks of concrete from breaking off the edges where the cracks meets it.
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