There are a couple of ways to pour concrete next to concrete. How do you pour concrete next to concrete? In those cases, it may be necessary to roughen the surface of the existing concrete or to use a concrete bonding agent. There are, however, some instances where the existing concrete may be too smooth or the surface may have been treated with a sealer that will prevent good bonding. Typically, concrete will bond to concrete.
You will need to make sure that the new layer of concrete is level with the existing slab. You can add concrete to an existing slab by adding a layer of concrete over the top of the slab. Can you put a thin layer of concrete over concrete?.What concrete will stick to existing concrete?.How much does it cost to extend concrete patio?.How can we increase the height of concrete?.Can you pour self-leveling concrete over existing concrete?.How do you join two concrete slabs together?.How do you pour concrete next to concrete?.How do you add concrete to an existing slab?.Cover the slab with plastic and allow it to cure for week before applying a sealant to protect the new, level concrete surface. Place the joints in the same area as those that were cut in the original surface. Use a sweeping motion to smooth the new sand-mix surface.Ĭut the control joints into the new concrete to allow the new surface room to expand and contract with temperature changes. This is a mason’s trowel with a wooden blade rather than a steel one. Float the surface of the concrete with a wood float. For the area that slopes, use a thicker layer of concrete. This is a flat, straight two-by-four piece of lumber with an attached handle. Use a spade to spread a layer of the new concrete onto the original slab.
Mix the sand-mix concrete, aiming for a consistency that is slightly thicker than a regular concrete mix. The adhesive will also keep water from gathering between the layers and causing damage. The adhesive will create a bond between the two layers of concrete and reduce the possibility of cracks developing in the new surface.
Spread a layer of bonding adhesive onto the concrete surface.
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