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A shrinkage joint, or control joint is a separation cut with a finishing handtool into wet concrete sidewalks to 1/4 of the depth of the concrete. Since concrete shrinks a tiny bit as it cures, little tiny cracks may develop . . . the shrinkage joints make those cracks appear in the nice straight joints, thus improving the looks of the new concrete walk.

Shrinkage joints may also be cut in after the concrete has cured long enough to stand on (several hours) with a concrete-cutting saw.

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