Quick Answer: Pouring Concrete Next To Existing Concrete?

Can you pour new concrete next to old concrete?

On the contrary, if your existing concrete is stable and elevating a few inches of its height won’t hinder anything in the way, then you can certainly get new concrete poured over the old one. But make sure to leave this to professionals since you don’t directly pour the layer of concrete.

How do you attach concrete to old concrete?

  1. Drill 5/8-inch diameter holes six inches deep into the old concrete.
  2. Flush the holes with water.
  3. Inject epoxy into the backs of the holes.
  4. Push duct tape over the ends of the rebar, putting holes in the pieces of tape, and slide them against the holes in the concrete to prevent the epoxy from dripping out while curing.

How do you join two concrete pours?

Run a bead of concrete epoxy on the face of the edge of the first concrete slab, above and below the dowels. Cut your expansion joint material with a box cutter so you can press two strips onto the concrete (above and below the dowels) the entire length of the edge. You are now ready to pour your slab.

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Can you pour concrete in two pours?

Generally—yes. If you know you are going to have a “cold joint” as you described, leave the surface rough—the best technique is to make a key way at the joining surface by using a length of 2×2 or 2×4 to form a key way when you do the first pour–remove the 2x before you do the second pour.

Can you pour concrete over dirt?

Long story short, yes you can pour concrete over dirt.

When should you pour concrete?

Experts agree—the best temperature to pour concrete is between 40° – 60°F. When temperatures dip below 40°F, the chemical reactions that strengthen concrete slow down and can lead to weaker concrete.

Can I glue concrete to concrete?

QUIKRETE® Concrete Bonding Adhesive (No. 9902) permanently bonds new concrete, plaster, and stucco to existing concrete, plaster, and stucco. Eliminates the need for roughing the surface before the application.

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.

How long can you wait between concrete pours?

Although concrete will harden soon after pouring, it’s still susceptible to damage from weight during the first four weeks. Wait at least 24 hours before allowing foot traffic, including pets, on a newly poured sidewalk or slab, and don’t drive a vehicle on a new driveway for at least 10 days.

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Is it better to pour concrete in sections?

There are many advantages to pouring your concrete floor in sections, including extending the life and health of your concrete. Another advantage or sectioning is that you can do it yourself and do not have to hire an entire work crew to get the job done before the cement dries.

Should you put plastic under concrete?

Recently, though, research has shown that the old traditional layer of 6-mil Visqueen (polyethylene plastic) under the slab is seldom effective for two main reasons: Although it may seem water-tight, this grade of material allows a lot of water vapor to pass through.

Do you need gravel under concrete?

Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.

How many bags of concrete do I need for a 10×20 slab?

A 60-pound bag yields. 017 cubic yards, and an 80-pound bag yields. 022 cubic yards. For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags.

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