Cuts are a used to create control joints in concrete, which help control the cracking occurs due to shrinkage. The concrete should be cut only after the it has obtained sufficient strength but before internal cracking begins. The timing of saw cuts is critical as when to make cuts depends on many factors, including the type of  aggregate used in the concrete, the air temperature, and the concrete's mix design. Sawing too late can result in uncontrolled cracking as the concrete contracts during curing.