A good rule of thumb is to cut the joints one-quarter to one-third the slab thickness. For a 6-inch-thick slab, that means cutting 1.5 to 2 inches deep. Ensure that the saw cut depth meets the structural engineering specifications..
Moreover, when should I cut my concrete slab?
The timing varies depending on the temperature and the relative humidity, but the window is generally 4 to 12 hours after concrete placement. The cut depth should be at least ¼ the thickness of the slab. For decorative work or smaller slabs, a regular dry-cut cut-off saw can be used.
how deep can a concrete saw cut? A 7” circular saw, for instance, can only cut to 2-¼ inches deep, meaning you'll need to sledgehammer the rest of the concrete away; a 14” wet-cutting blade attached to a concrete-cutting saw, on the other hand, gets you to 4-5/8 inches of clean cut.
Correspondingly, how long after pouring concrete can you cut it?
4 to 12 hours
How do you cut thick concrete?
If your cut doesn't need to be exact, use a cold chisel and hand sledge to cut the concrete. Score the length of the cut three or four times with the chisel. A circular saw with a masonry blade can also be used to either score or completely cut through the block.
Related Question Answers
Are concrete expansion joints necessary?
Expansion joints are virtually never needed with interior slabs, because the concrete doesn't expand that much—it never gets that hot. Expansion joints in concrete pavement are also seldom needed, since the contraction joints open enough (from drying shrinkage) to account for temperature expansion.Do I need an expansion joint in concrete slab?
How Often Do You Need Expansion Joints? So for a 4 inch thick concrete slab, expansion joints should be no more than 8 to 12 feet apart. They should also be placed around structures that go deeper than the concrete slab, such as columns or walls.Why do they cut lines in concrete?
If you're using concrete to make a sidewalk, the shrinking concrete will cause cracks to appear as it dries. To prevent sidewalks from cracking in random spots and breaking apart, builders make lines in sidewalks. Of course, they don't just call them lines. The technical term for sidewalk lines is contraction joints.Why do they cut concrete slabs?
Saw cuts are a used to create control joints in concrete, which help control where cracking occurs due to shrinkage. The cuts should be made at a predetermined spacing and only after the concrete has obtained sufficient strength but before internal cracking begins. Therefore, the timing of saw cuts is critical.What is the difference between expansion joints and control joints?
A control joint is used to reduce the occurrence of shrinkage in concrete, and it is usually a continuous, vertical joint filled with mortar. An expansion joint is a continuous or horizontal joint. Unlike control joints, expansion joints are left completely free of mortar.Does stamped concrete crack?
Stamped concrete is highly resistant to cracking when installed correctly. Even if stamped concrete experiences minor cracking, the cracks are often hard to detect because they will often blend in with the pattern and joint lines.When should you use expansion joints in concrete?
The goal of the control joint is to allow the slab to crack, during expansion and contraction, in a known location and in a straight line. Expansion joints are put in place before the concrete is poured. Expansion joints are used to allow the slab to move and not put stress on whatever it abuts.Can you cut concrete with a Sawzall?
Cutting concrete with a reciprocating saw begins with safety gear. Cutting concrete creates dust and sends sharp shards of material flying toward the tool operator. Because concrete dust can cause respiratory discomfort or damage, reciprocal saw operators must wear face masks or respirators.How do I keep my concrete slab from cracking?
To avoid plastic shrinkage, the key is to keep the concrete surface moist by covering it with burlap, polyethylene sheeting or plastic. This is especially important in extreme weather conditions such as high wind, hot temperatures or direct sunlight.How much does concrete cutting cost?
Minimum cost will be $250. Electric powered slab sawing will be approximately 40% higher for the same depth. Green concrete (2 days old) sawing will usually cost 15 to 20% less. Work done on an hourly basis will cost $125 per hour for slabs up to 4" thick and $135 per hour for 5" or 6" thick slabs.Can a concrete saw cut through rebar?
Some people may argue that it's possible to cut through rebar using abrasive blades. However, this is not recommended as these blades are better suited for loose rebar or ordinary steel/iron rods. Any metal that is firmly embedded in concrete should be cut using an appropriate diamond blade concrete saw.Is it too late to cut control joints?
WHEN TO SAW CONTROL JOINTS Cutting freshly poured concrete too late can lead to unwanted cracks in the concrete, rendering the joints ineffective. For most concrete work, cutting should take place within the first 6 to 18 hours and never beyond 24 hours.Does concrete expand in cold weather?
However, concrete does indeed expand when it gets hot or when the moisture content changes. In exterior concrete, joints widen during cold weather because of cooling contraction and get narrower during hot weather as the concrete expands.How many saw cut concrete?
While experience will help you get a better idea of what works for your concrete and climate, there is a rule of thumb to start with. Cuts should be approx. 2-3 times the thickness of your slab in feet. For example, a 6” slab would have cuts 12' – 18' apart.How do you install expansion joints in concrete?
The easiest way to add expansion joints is to do it during the pouring of your cement slab. As you finish pouring each section of your driveway, slip an expansion joint into the form between the section you've just poured and the section you are about to pour.How many yards of concrete does a truck hold?
10
Can a angle grinder cut concrete?
Although various concrete cutting saw are avalible , angle grinder is the most convenient tool for small concrete cutting work. Besides, a angle grinder are usefull for cutting tiles, bricks, granite, marble and other meterials.How can I cut concrete without dust?
A small amount of water can go a long way toward reducing dust if you have to cut concrete with a circular saw and a diamond blade. For dust control in these situations, I rely on a 5-gal. drywall-compound bucket with a hole in the side.What is the best concrete saw?
Concrete saws included in this wiki include the husqvarna k760 ii, skilsaw spt79a, makita dry 4100kb, evolution power tools disccut 1, dewalt masonry 860, hilti dsh 700 14-inch, skilsaw spt79-00 15-amp medusaw, and makita 4 stroke power cutter. Most Recent Picks: 
