Is it too late to cut new joints, which are really decorative, and do not have to be very deep? They're placed at regular intervals in pavements. Listed here are the top five reasons to cut concrete using high tech equipment such as concrete cutting saws: To repair any broken sewer lines or water pipes. It's never too late to add expansion joints, but you might want to contact a local concrete guy first to make sure they are necessary. Once cutting starts, it has to continue until the joints are finished and before the concrete surface temperature begins to fall. You can avoid joint raveling with the following actions: Before you begin cutting, know where the cuts go. This timing is dependent upon the type of mixture, the temperatures outside and any aggregates that have been added. One reason to cut concrete is to make any necessary repairs on broken sewer lines or water pipes. Decorative concrete contractor Tom Ralston has probably never met you, but even so, he suspects you're waiting too long before cutting your control joints. The other important aspect of curing is temperature-the concrete can't be too cold or too hot. Too late for saw cut control joint? However, there are many types of saw blades out there, and having different ones on hand is wise, anyway. What can I do to significantly reduce the risk of my concrete cracking? Cut the Concrete. Proceed slowly, maintaining minimum RPMs of the cut-off saw. You may need to cut concrete if these are located under concrete slabs. Do not twist the blade, do not let the blade spin. Where the essential personal protective equipment: goggles, a helmet, a face mask, thick pants, long-sleeve shirts, and steel-toed boots. This timing is critical, and the occur-rence of uncontrolled cracking due to saw cutting too late is far too common in slabs. Concrete Control Joints Concrete can crack from thermal expansion and contraction caused by soil movement. Control joints in concrete slabs control the location and extent of cracking. Some contractors put off sawing in order to protect equipment and help blades last longer. Always Start With a Surface Cut. Smaller early-entry saws are available, which may allow cutting to begin within a few hours after placement. As fresh concrete gets cooler, the hydration reaction slows down. If the scratch affects the surface texture, it's too early to cut. In cooler weather, sawing may not start for 12 hours after pouring. Always make sure your surface area is open and away from places where the blade can drop. Concrete control joints plan for cracks in pavements. Sawing too late can result in uncontrolled cracking as the concrete contracts during curing. Factors such as concrete mix, weather conditions, hardness of concrete and types of machines used for making the control joints determine when to cut the concrete slab.When the concrete is sawed with the help of blade before it has reached its initial setting time, the aggregates may strew out of the concrete slab and leave a messy, weakened edge along the joint. Typically concrete joints should be cut in less than a day, but the specific timing depends on numerous factors, including local conditions, weather and concrete mix. 1 Invest in a diamond blade. This is due to inadequate saw cut timing – when you saw cut concrete is important. If you are work with concrete that has high shrinkage, you may need to decrease  cut spacing. Although various concrete cutting saw are avalible , angle grinder is the most convenient tool for small concrete cutting work. Projects, Making cuts in an angle grinder, commonly known as “! 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