Can old concrete be cut?

Addie Stecklein asked, updated on July 24th, 2022; Topic: concrete
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With a diamond blade and proper safety precautions, you can cut through concrete for your sidewalk, countertop, patio, or DIY project. Whether you want to create a countertop or expand your sidewalk, cutting concrete yourself may not be as daunting as you imagine.

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In all cases, what happens if you don't cut concrete?

Cutting too early can mark the pavement surface as well as cause joint raveling. Late sawing can result in random concrete cracks. Shallow cracks aren't sufficient to prevent uncontrolled cracking while deep cuts are excessively labor intensive and undermine the aggregate interlock in the concrete.

Moreover, are saw cuts in concrete necessary? When concrete is poured, it is very important to cut expansion joints in the concrete. By cutting control joints in the concrete you can better control the random cracking that inevitably occurs in concrete slabs soon after the concrete is poured and set.

One way or another, how do you edge concrete after it dries?

These are the 4 steps in how to smooth concrete after it dries:

  • Remove all imperfections on the surface.
  • Vacuum up all debris and apply the adherent.
  • Apply a new layer of concrete.
  • Sand the surface and wash the concrete.
  • Apply a layer of vitrifier to protect the concrete.
  • How do you cut 4 inches of concrete?

    Use a standard circular saw, equipped with a corundum or diamond blade, for small tasks. For slabs, it's best to cut through the top inch, then use a sledgehammer to break off the rest. The jagged edge left below the cutting line provides a good rough edge for the new concrete to bond to.

    21 Related Questions Answered

    How deep can a 14-inch concrete saw cut?

    A 14-inch circular blade on a cut-off saw is designed for a maximum depth of slightly less than five inches.

    How long can you wait to saw cut concrete?

    Joints should be sawed as soon as the concrete can withstand the energy of sawing without raveling or dislodging aggregate particles. For most concrete work, cutting should take place within the first 6 to 18 hours and never beyond 24 hours.

    How many times do you float concrete?

    Push the bull float in one direction only across the concrete, keeping its front edge slightly above the surface by raising or lowering the handle. Two or three times is enough. Don't overwork the concrete or you'll weaken it by drawing too much sand and cement to the surface.

    Where do you put cuts in concrete?

    It is recommended to start saw cuts on or at the center of column lines. Joints shall be spaced at 24 to 36 times the slab thickness but this need to be confirmed by a structural engineer. Joint spacing normally ranges between 10 to 18 feet depending on the amount of reinforcement the slab has.

    Does a concrete driveway need expansion joints?

    Every concrete slab, inside (basements, garages, etc.) or outside (driveways, patios, entries, etc.) are required to have joints every eight feet horizontally and vertically. Expansion Joints provide space between concrete slabs as a buffer for expansion on hot days and contraction when it is cold.

    How soon can you walk on concrete?

    After 24 hours, you can walk on your newly poured concrete, but avoid dragging your feet, 'doing the twist', or allowing your pets to walk on it as their claws can scuff the concrete.

    When should you Powerfloat?

    A rough guide for considering when to begin power floating is when walking on the surface leaves indentations of 3-4 mm. If the concrete is too wet the machine will tear up the surface, and if it is too dry, it will not be possible to trim high spots or fill low spots effectively.

    Can you smooth rough concrete?

    Smooth rough concrete with concrete resurfacer. ... Avoid having to smooth rough concrete with an aggressive concrete grinding machine and choose instead to resurface the concrete. Apply wet concrete resurfacer on top of old concrete to create a smooth overlay that gives your patio a fresh, new look.

    Can you cut concrete with a chainsaw?

    Concrete chain sawing requires the use of a specialty saw for cutting into concrete, pipe and so much more. ... While similar to a concrete cut-off saw, a concrete chainsaw is designed to plunge nose first into the concrete and has the ability to cut more than twice as deep as a 14-inch cut-off saw.

    How much does it cost to cut concrete?

    Concrete Cutting Costs Per Foot Pros usually charge between $4.75 and $7.50 per linear foot to cut a typical 4 inch slab. The final price can change depending on the complexity of the job, as well as regional labor and material costs.

    How do you cut concrete by hand?

    In one hand, take a chisel and place the edge at one end of the mark in the concrete. Hammer the chisel into the concrete, and continue doing so until you have formed a groove. Several consecutive blows should do the trick. Then repeat the process at the other end of the cut mark until the groove forms a channel.

    How long will a diamond blade last cutting concrete?

    According to experts, a low-quality diamond blade can only last around 12 hours of non-stop cutting, while high-quality blades can cut materials up to 120 hours.

    How deep will a 16 inch concrete blade cut?

    Diamond Blade Cutting DepthsMaximum Blade Cutting Depths
    12"3 5/8"
    14"4 5/8"
    16"5 5/8"
    18"6 5/8"

    Why do they cut lines in concrete?

    To prevent sidewalks from cracking in random spots and breaking apart, builders make lines in sidewalks. ... The technical term for sidewalk lines is contraction joints. Contraction joints are placed in fresh concrete before the concrete dries and has a chance to create its own joints, which we call cracks.

    Are expansion joints necessary?

    Expansion joints are virtually never needed with interior slabs, because the concrete doesn't expand that muchβ€”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.

    How often do you need an expansion joint in concrete?

    Usually, expansion joints should be no farther apart than 2 to 3 times (in feet) the total width of the concrete (in inches).

    What is the best blade for cutting concrete?

    Diamond saw blades are typically the best choice when it comes to making clean, professional cuts in concrete.

    How deep will a 20 concrete blade cut?

    Cured Concrete/Asphalt BladesDiameterCutting Depth*
    20"(508mm)8"
    24"(610mm)10"
    26"(660mm)10-5/8"

    What may occur if a slab is floated too soon?

    More often, premature finishing or improper first (bull floating) or second floating results in trapping rising bleed water and air below the top surface of the concrete (Image 2). When this occurs, the resulting weak or soft zone below the surface causes the top surface of the concrete to flake or scale off.

    What makes concrete crack?

    Shrinkage is a main cause of cracking. As concrete hardens and dries it shrinks. This is due to the evaporation of excess mixing water. The wetter or soupier the concrete mix, the greater the shrinkage will be.

    How big can a concrete slab be without control joints?

    Rule #5: For better crack control keep the maximum distance between joints in feet at 2 to 2.5 times the slab thickness in inches. For a 6 in. thick slab, the maximum joint spacing should be limited to 12 to 15 ft. Exceeding a joint spacing of 15 ft.
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