Length - 03:11 There are a variety of jointers and groovers that concrete finishers work with to cut contraction or control joints in a concrete slab. This is done to ensure that the concrete slab cracks at the control joint instead of in the middle of the slab. Hand groovers, walking jointers, hand chisels, or walking groover can be used to put joints in the concrete surface. To begin, snap a straight line in the fresh concrete slab to use as a guideline when cutting the control joint. Be sure that the groover you are using will cut a joint that is one quarter of the slab's depth. For example, if the slab is 4 inches thick, the control joint should be cut 1 inch deep. With a harsh mix you may need to use the groover several times in addition to closing the control joint with concrete paste. Meaning, you should take a composite float to move paste into the joint and repeat the grooving process.
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