Pouring new concrete over existing concrete is possible, but there are some important considerations to take into account. If the existing concrete has unresolved issues such as cracks or piles of frost, these will be transferred to the new concrete if left unattended. To ensure a strong and lasting bond between the two slabs, it is best to pour the new concrete with a thickness of at least 2 inches and bond it to the old concrete. Surface preparation is essential for achieving a strong bond between the two surfaces.
The old concrete should be treated with an adhesive agent and brushed with a soft-bristled brush. If you need to patch the concrete, apply a thin layer of cement paint, pour a well-mixed concrete patch into the holes and clean the surface with a wooden float. To prevent concrete from sticking to other materials, you need to treat them with a release agent. If you want to stamp or color the new concrete, it should be approximately 2 inches thick and quickly ensure that it is level and smooth before using stamps.
If there is extensive settling, agitation or cracking in the existing concrete, it is important to investigate why this occurred and correct the problem before pouring new concrete on top. To achieve a strong and lasting bond between new and old concrete, it is important to invest in a strong adhesive agent and a concrete patch mixture. With proper surface preparation and the right materials, you can successfully bond new concrete to existing concrete.