How To Concrete Over Old Concrete

The surface was badly worn and pitted but the slab was sound and there was ample height to pour a new slab right over the old one. Pouring over old concrete need similar basic formworks that employed with fresh pours. Spread the new concrete over the surface filling the entire area within the form you created.

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Before you add your new concrete take a large brush and dip it into the bonding slurry.

How to concrete over old concrete.

Keep spraying it until the moisture runs off the sides instead of being absorbed. Pouring concrete over old concrete instead of directly over a new gravel foundation limits your ability to maximize the slab s lifespan. This old concrete patio was a perfect candidate for pouring new concrete right. It was originally poured in multiple sections so it had some seams that looked like cracks.

When pouring new mix over old concrete make the mixture stiffer than usual by adding less water. For this to be feasible the contractor needs to pour at least 2 inches thick use smaller aggregate and incorporate reinforcement such as welded wire mesh or fiber mixed into the concrete. Brush the slurry over the damp concrete to form an even layer. Layering new concrete over old isn t a durable option only when the materials used are of poor quality or if one skips the binding procedure.

The condition of the existing slab is the primary factor that determines how long the new concrete will last. If you are laying pouring concrete over existing concrete there needs to be a bond. Smooth the surface using a two by four or float then add texture as desired using tools or a broom. Install the form usually wood form around the perimeter of old concrete surface.

Concrete is porous so it can absorb liquid. As mentioned earlier concrete in itself doesn t have any binding properties to take the load of an additional new layer. Dry up any water pooled over the concrete before continuing. You could drill holes into the existing concrete surface and insert steel pins and then the mesh on top.

Make sure that the height of the formwork is even. Get the old concrete slab completely wet making sure any cleaning chemicals you used get rinsed off in the process. A well poured concrete slab with a deep sturdy foundation can last for 30 to 40 years. If done properly new concrete can often be poured right over an existing slab.

So if you pour new concrete over the old surface without preparing the one. The old concrete was over 20 years old. The form shall extend above existing concrete surface based on the designated thickness of the new concrete. Brush a thin layer of the slurry mixture onto the old concrete.

When i say bond the concrete you are lying on top off needs to be a rough finish like scabbled. Make sure all of the old concrete has a layer of slurry on top of it before you move on.

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