Why do sidewalks have blocks, instead of being solid?
In: 205
They are solid, at least they are where I am in southern Ontario, Canada. The sidewalk slabs are poured in one go, then control joints are added with a hand tool. The slabs are generally 4-6 inches thick while the joint is only around an inch or so deep. The joints are there so that when the concrete cracks due to shifting or thermal expansion/contraction, it cracks at the joint rather than in a random location.
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