October 30, 2014
Control joints are typically recommended so that random cracking will take place at predetermined locations for a more aesthetically pleasing appearance. Although joints are most commonly tooled into the concrete at the time of placement (prior to the onset of bleed water), they may also be saw cut into the hardened concrete surface. Correct timing depends on many variables such as environmental conditions, concrete design, and blade type, among others. Saw cutting is often done 4 to 48 hours after finishing, primarily depending upon the weather conditions. Because your pad has been poured for two weeks, there is a risk that as the saw moves across the concrete, uncontrolled cracking may develop ahead of the saw. A diamond blade will offer a better chance of successfully cutting than other blade types, such as silicon carbide blades, but you should still evaluate the risk.
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