eli5: Why are sidewalks, driveways, curbs and other surfaces made of concrete and/or cement always made with a line dividing it into sections, when it’s all just one big pour?
In: Engineering
Concrete is going to crack. You can give it places to crack that don’t cause problems, or you can let it crack where it wants to. The dividing lines give the concrete preferred places to crack. That why they also sometimes put some fiberboard between sections of concrete so that there is a place for relative movement without cracking.
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