How do you square up a concrete slab?

Quote from the video:
Quote from Youtube video: We drive a nail into the wood stake and bend the tip up. You can do fine adjustments by bending the nail the string line is attached to if a courser movement is needed driving.

Can you expand an existing concrete slab?

Quote from the video:
Quote from Youtube video: And once i had it full i took my rebar. And inserted it through again with the idea being to create a strong joint between the existing slab. And the new concrete that would be poured.

How do you raise a concrete slab yourself?

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Quote from Youtube video: The jacks are in position resting on cement blocks and scrap 2×8 boards. The two jacks are raised slowly at the same rate simultaneously i raised the slab six inches to prepare to slide in the foam.

How do you pour a concrete slab on uneven ground?

Mark off the area as usual and then dig it out to the required depth. The depth depends on what type of concrete you’re using and whether it needs a gravel base. You’ll need to dig out more on the higher side to make it level with the lower side. Smooth out the ground and then check the level in all directions.

How do you attach new concrete to old concrete?

Quote from the video:
Quote from Youtube video: So what we're going to do is we're going to drill in some reinforcing bar or some rebar. Some steel dowels into the old concrete. In certain spots and on certain angles.

Can you put a thin layer of concrete over concrete?

Is it okay to pour concrete over existing concrete? Yes, you can put new concrete over old concrete providing there are no issues such as significant cracks of frost heaves with your existing concrete. A new layer of concrete should be about two inches to ensure an even, strong coverage.

How do you level the grade of a concrete slab?

Quote from the video:
Quote from Youtube video: So be sure to concentrate on that as you're creating your grade. Now we're going to actually cut this down a little bit lower than we need to go and build some areas back up with some compacted stone.

How do you shape concrete?

Apply the concrete to the mesh.

Using a metal trowel, or another hand tool, apply the concrete to the wire mesh. Apply the concrete in thin layers. Add more layers until you achieve your desired shape.

How do you level an area of concrete?

The ground should be dug to a depth of 3 to 5 inches with a trench dug on either side. If the ground is mostly clay, an additional 2 inches of depth is needed to hold gravel, which will aid in drainage. If the surface is prepared with a fluctuation in depth of no more than 1 inch, your concrete will be level.

Will fresh concrete stick to old concrete?

A bonding agent (bonding adhesive) needs to be painted onto the existing concrete first to ensure that the fresh concrete will successfully adhere. This is also true of floor repairs, if concrete is used to fill gaps caused by damage. The new won’t adhere to the old without the help of a bonding adhesive.

Can you join concrete to concrete?

You can join the new concrete right to the old concrete, this is called a concrete construction joint. The edge of the existing concrete that was sawed should be drilled and doweled so the new concrete won’t separate, lift, or settle from the old concrete.

How do I join old and new slab?

Things to remember while Joining new concrete to old concrete

  1. We should not join the new slab with an old slab only with the help of a cement slurry.
  2. Clean the joining surface of the old slab with the help of a metallic brush completely.
  3. Overlapping of reinforcement should be done.

How big can a concrete slab be without expansion joints?

Rule #1 – Keep joints as square as possible. Rule #2 – In order to prevent intermediate cracking, space joints (in feet) no more than 2 – 3 times the slab thickness (in inches).

How do you join two pieces of concrete together?

An epoxy will work for this application. I have used the epoxy at Lowes to bond two pieces of concrete together with success. There are 2 or 3 different brands, any of them will work fine. This epoxy comes in a tube, is 2 parts 2 different colors, and you mix them together to make a paste.

Can you add expansion joints after concrete is poured?

You can install concrete expansion joints before or after the concrete is laid.

How do you fill a 2 inch gap in concrete?

Quote from the video:
Quote from Youtube video: Now if i have any large holes where voids are starting to form underneath the concrete. I do recommend some sand for that and filling those voids in before you seal off the top with the tremco.

Do concrete slabs need expansion joints?

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.